Biodiversity Data Journal 2: e1049 doi: 10.3897/BDJ.2.e1049 Data paper Tree diversity of the Dja Faunal Reserve, southeastern Cameroon Bonaventure Sonké†, Thomas L.P. Couvreur‡,† † Université de Yaoundé I, Ecole Normale Supérieure, Yaoundé, Cameroon ‡ Institut de Recherche pour le Développement (IRD), Montpellier, France Corresponding author: Bonaventure Sonké (bsonke_1999@yahoo.com) Academic editor: Lyubomir Penev Received: 02 Jan 2014 | Accepted: 23 Jan 2014 | Published: 24 Jan 2014 Citation: Sonké B, Couvreur T (2014) Tree diversity of the Dja Faunal Reserve, southeastern Cameroon. Biodiversity Data Journal 2: e1049. doi: 10.3897/BDJ.2.e1049 Abstract The Dja Faunal Reserve located in southeastern Cameroon represents the largest and best protected rainforest patch in Cameroon. Here we make available a dataset on the inventory of tree species collected across the Dja. For this study nine 5 km long and 5 m wide transects were installed. All species with a diameter at breast height greater than 10 cm were recorded, identified and measured. A total of 11546 individuals were recorded, corresponding to a total of 312 species identified with 60 genera containing unidentified taxa. Of the 54 identified families Fabaceae, Rubiaceae and Malvaceae were the most species rich, whereas Fabaceae, Phyllantaceae and Olacaceae were the most abundant. Finally, Tabernaemontana crassa was the most abundant species across the Reserve. This dataset provides a unique insight into the tree diversity of the Dja Faunal Reserve and is now publically available and usable. Keywords Africa, diversity, transect, Dja Faunal Reserve, conservation, species inventory © Sonké B, Couvreur T. This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. 2 Sonké B, Couvreur T Introduction Tropical rainforests are among the most diverse plant communities worldwide and contain more than 50% of the Earth’s species diversity (Parmentier et al. 2007). Rain forests are remarkable by the diversity of tree species they contain, in places reaching up to 300 different species within a single hectare of inventoried forest (Valencia et al. 1994). Yet inventory of species in tropical countries remains challenging (Campbell and Hammond 1989). The Republic of Cameroon, situated on the Atlantic Coast in the Gulf of Guinea, covers 475440 km² and has such a great diversity of habitats that it is often compared to "a small Africa". Although Cameroon has been better explored by botanists than most of other Central African countries (Letouzey 1968), its flora remains incompletely known, and several new species are described or newly recorded every year (e.g. Cheek 2009, Droissart et al. 2009, Lachenaud and Séné 2012, Sonké et al. 2009, Lachenaud et al. 2013). This is partly due to the high botanical diversity of the country (e.g. Kenfack et al. 2007) which includes many endemics (Onana 2011). In addition, botanical efforts have tended to focus on some specific sites (e.g. Mt Cameroon, Bakossi mountains, Campo Ma'an National Park; Cheek et al. 2004, Cable and Cheek 1998, Tchouto et al. 2006), leaving other areas almost unexplored, especially in the west and southeast (Onana 2011, Droissart et al. 2012). The present contribution publishes the results of an inventory made some years ago in the Dja Faunal Reserve, a UNESCO World Heritage Site, located in southeastern Cameroon. Its altitude is between 500 and 700 m and covers an area of 526,000 ha mainly classified as moist evergreen tropical forests (Letouzey 1985) and belongs to the Guineo-congolian phytochoria of (White 1979). It is bounded on three-quarters of its periphery by a natural barrier that is the Dja river. The reserve also belongs to the TRIDOM forest block that encompasses several other major reserves such as Odzala National Parc in the République du Congo and the Minkébé Natinal Parc in Gabon. This region is characterized by a low collection density of botanical specimens and are thus fragmentarily known (Valkenburg et al. 1998, Onana 2011, Droissart et al. 2012). The present dataset was available only under printed form (Sonké 2004, Sonké 1998). Here we make it available open access under electronic form. This dataset has been used to assess the role of dispersal and niche differentiation in explaining species distribution across the reserve (Hardy and Sonké 2004). Project description Title: Tree Inventory of the Dja Faunal Reserve, South Cameroon. Personel: Bonaventure Sonké Tree diversity of the Dja Faunal Reserve, southeastern Cameroon 3 Study area description: The dataset contains tree inventory of nine 5 km long 5 meters wide transects across the Dja Faunal Reserve. The Dja Forest Reserve is situated at 2°50 – 3°30 N and 12°20 – 13°40 E in southeastern Cameroon, bounded on three sides by the Dja River (Fig. 1), a major tributary of the Congo river, within the area known as the southern plateau. Most of the Dja Faunal Reserve is situated at 600–700 m above the sea level and covers 526,000 ha making it one of the largest and best protected areas of lowland rainforest across tropical Africa. The monthly average temperature lies between 23.5 °C and 24.5 °C and the annual rainfall between 1180 mm and 2350 mm. There are four major vegetation types in the Dja: primary terra firme primary forest (74% of total individuals collected occurring in this vegetation type); (ii) secondary forest (8% of total individuals); (iii) gaps (4% of total individuals). Finally, two hydromorphic types were defined as (iv) swamps (11%) and (v) flooded forest (3%). The different vegetation types across each transect are provided in Suppl. material 2. Transects were placed at the following coordinates: Figure 1. The Dja Faunal Reserve, South Cameroon, with the location of the 9 transects (T1-T9). Dark blue lines represent rivers. Light blue lines represent the delimitation of the Dja Faunal Reserve. Yellow patches are degraded vegetation while green and dark green patches represent tropical rain forest. Finer scale vegetation patterns are note represented here. Vegetation types based on Guillaumet, Chevillotte & Valton (IRD; MNHN). T1: start: 12.8573; 3.3243; end: 12.8622; 3.2824 T2: start: 12.8637; 3.2303; end: 12.8622; 3.2726 T3: start: 12.8695; 3.1752; end: 12.8636; 3.2183 T4: start: 12.8846; 3.0895; end: 12.8787; 3.1325 T5: start: 12.5367; 3.1816; end: 12.5866; 3.1787 4 Sonké B, Couvreur T T6: start: 12.5958; 3.1936; end: 12.6447; 3.1925 T7: start: 13.3293; 2.9203; end: 13.3301; 2.8792 T8: start: 13.3105; 2.9787; end: 13.3133; 2.9403 T9: start: 13.5287; 3.0510; end: 13.5817; 3.0498 There are local Baka people living in the forest practicing subsistence hunting and gathering, thus there is some minimal human pressure on the forest. The forest has its full compliment of large animals, including Western Lowland Gorillas (Gorilla gorilla gorilla) and African forest elephants (Loxodonto Africana cyclotis) (Dupain et al. 2004). Funding: Collection of the data in the field was funded by the European Union project ECOFAC. Sampling methods Study extent: The dataset was collected between August 1993 and August 1995. Sampling description: A line transect approach was chosen to sample forest diversity because it covers the heterogeneity of the forest better than a square plot. We used standardized methods to install the transects, identify, map, measure and re-measure the trees (Baker et al. 2004). Each transect line was 5 meters wide and 5 km long. A total of 9 such transects were done at different places across the reserve Fig. 1. All trees ≥ 10 cm dbh (diameter at breast height, 1.3 m or above all deformities, notable buttresses, if present), were identified, mapped, individually numbered with an aluminium tag and nail, and measured with a diameter tape, or estimated if this the correct point of measurement was not possible to reach. Trees were identified up to species level, and in some cases just up to genus level. Voucher specimens were collected and deposited in different herbaria (mainly YA) and in case of any doubt, supplementary material was collected for further identifications. Quality control: The present dataset was updated to match the APG III classification of angiosperm families (APGIII 2003) and all species names were checked for validity (spelling and authorship) against online databses (http://tnrs.iplantcollaborative.org/ index.html, http://ipni.org; http://plants.jstor.org/; http://www.ville-ge.ch/musinfo/bd/cjb/ africa/recherche.php). Step description: The dataset presented here was collected over a period of three years. Tree diversity of the Dja Faunal Reserve, southeastern Cameroon 5 Geographic coverage Description: Data was collected in 9 different sites across the reserve as illustrated in Fig. 1. Coordinates: 13.666667 and 2.833333 Latitude; 12.333333 and 3.5 Longitude. Taxonomic coverage Description: The dataset contains a total of 11546 tagged individuals representing 312 total taxa identified to species level (Table 1) belonging to 54 families and 213 genera (a few photos of selected species are provided in Figs 2, 3). For 60 genera some individuals remained unidentified (marked as sp.). This is mainly related to the poorly known taxonomy of those genera or lack of appropriate material (e.g. flowers) to provide a definite determination. The raw data is available in Suppl. material 1. Table 1. List of identified species collected in the Dja Faunal Reserve. Species_name Author_name APGIII_family_name Afzelia bella Harms Fabaceae Afzelia bipindensis Harms Fabaceae Aidia micrantha (K. Schum.) Bullock ex F. White Rubiaceae Albizia adianthifolia (Schumach.) W. Wight Fabaceae Albizia ferruginea (Guill. & Perr.) Benth. Fabaceae Albizia glaberrima Benth. Fabaceae Albizia gummifera (J.F. Gmel.) C.A. Sm. Fabaceae Albizia zygia J.F. Macbr. Fabaceae Allanblackia floribunda Oliv. Clusiaceae Allanblackia gabonensis Bamps Clusiaceae Allophylus africanus P. Beauv. Sapindaceae Alstonia boonei De Wild. Apocynaceae Amphimas ferrugineus Pierre ex Harms Fabaceae Amphimas pterocarpoides Harms Fabaceae Angylocalyx pynaertii De Wild. Fabaceae Annickia affinis (Exell) Versteegh & Sosef Annonaceae Anonidium mannii Engl. & Diels Annonaceae Anopyxis klaineana (Pierre) Engl. Rhizophoraceae Anthonotha cladantha (Harms) J. Léonard Fabaceae Anthonotha fragrans (Baker f.) Exell & Hillc. Fabaceae Anthonotha macrophylla P. Beauv. Fabaceae Antidesma laciniatum Aubrév. Phyllanthaceae 6 Sonké B, Couvreur T Antidesma membranaceum Müll. Arg. Phyllanthaceae Antidesma venosum E. Mey. ex Tul. Phyllanthaceae Antrocaryon klaineanum Pierre Anacardiaceae Antrocaryon micraster A. Chev. & Guillaumin Anacardiaceae Aoranthe cladantha (K. Schum.) Somers Rubiaceae Aulacocalyx jasminiflora Hook. f. Rubiaceae Autranella congolensis (De Wild.) A. Chev. Sapotaceae Baillonella toxisperma Pierre Sapotaceae Balanites wilsoniana Dawe & Sprague Zygophyllaceae Barteria nigritana subsp. fistulosa (Mast.) Sleumer Passifloraceae Belonophora coriacea Hoyle Rubiaceae Bertiera racemosa (G. Don) K. Schum. Rubiaceae Blighia sapida K.D. Koenig Sapindaceae Blighia welwitschii (Hiern) Radlk. Sapindaceae Bombax brevicuspe Sprague Malvaceae Bombax buonopozense P. Beauv. Malvaceae Brenania brieyi (De Wild.) Petit Rubiaceae Bridelia grandis Pierre ex Hutch. Phyllanthaceae Bridelia micrantha (Hochst.) Baill. Phyllanthaceae Buchnerodendron speciosum Gürke Achariaceae Calpocalyx dinklagei Harms Fabaceae Canarium schweinfurthii Engl. Burseraceae Carapa procera DC. Meliaceae Casearia barteri Mast. Salicaceae Cavacoa quintasii (Pax & K. Hoffm.) Leonard Euphorbiaceae Ceiba pentandra (L.) Gaertn. Malvaceae Celtis adolfi-friderici Engl. Cannabaceae Celtis gomphophylla Baker Cannabaceae Celtis tessmannii Rendle Cannabaceae Celtis zenkeri Engl. Cannabaceae Centroplacus glaucinus Pierre Centroplacaceae Chlamydocola chlamydantha (K. Schum.) M. Bodard Malvaceae Chrysophyllum africanum A. DC. Sapotaceae Chrysophyllum boukokoense (Aubrév. & Pellegr.) L. Gaut. Sapotaceae Chrysophyllum lacourtianum De Wild. Sapotaceae Chrysophyllum pruniforme Pierre ex Engl. Sapotaceae Chytranthus atroviolaceus Baker f. ex Hutch. & Dalziel Sapindaceae Chytranthus macrobotrys (Gilg) Exell & Mendonça Sapindaceae Clausena anisata (Willd.) Hook. f. ex Benth. Rutaceae Cleistopholis glauca Pierre ex Engl. & Diels Annonaceae Cleistopholis patens (Benth.) Engl. & Diels Annonaceae Coelocaryon botryoides Vermoesen Myristicaceae Coelocaryon preussii Warb. Myristicaceae Tree diversity of the Dja Faunal Reserve, southeastern Cameroon Cola acuminata (P. Beauv.) Schott & Endl. Malvaceae Cola altissima Engl. Malvaceae Cola ballayi Cornu ex Heckel Malvaceae Cola flavo-velutina K. Schum. Malvaceae Cola lateritia K. Schum. Malvaceae Cola verticillata (Thonn.) Stapf ex A. Chev. Malvaceae Cordia aurantiaca Baker Boraginaceae Cordia platythyrsa Baker Boraginaceae Corynanthe pachyceras K. Schum. Rubiaceae Croton oligandrus Pierre ex Hutch. Euphorbiaceae Crotonogyne preussii Pax Euphorbiaceae Cuviera cuvieroides (Wernham) Onana Rubiaceae Cylicodiscus gabunensis Harms Fabaceae Dacryodes buettneri (Engl.) H.J. Lam Burseraceae Dacryodes edulis (G. Don) H.J. Lam Burseraceae Dacryodes klaineana (Pierre) H.J. Lam Burseraceae Desbordesia glaucescens (Engl.) Tiegh. Irvingiaceae Desplatsia chrysochlamys (Mildbr. & Burret) Mildbr. & Burret Malvaceae Desplatsia dewevrei (De Wild. & T. Durand) Burret Malvaceae Detarium macrocarpum Harms Fabaceae Dialium bipindense Harms Fabaceae Dialium dinklagei Harms Fabaceae Dialium guineense Willd. Fabaceae Dialium zenkeri Harms Fabaceae Dichostemma glaucescens Pierre Euphorbiaceae Diospyros bipindensis Gürke Ebenaceae Diospyros cinnabarina (Gürke) F. White Ebenaceae Diospyros conocarpa Gürke & K. Schum. Ebenaceae Diospyros crassiflora Hiern Ebenaceae Diospyros hoyleana F. White Ebenaceae Diospyros suaveolens Gürke Ebenaceae Discoglypremna caloneura (Pax) Prain Euphorbiaceae Distemonanthus benthamianus Baill. Fabaceae Dracaena arborea (Willd.) Link Asparagaceae Drypetes aframensis Hutch. Putranjivaceae Drypetes africana Vahl Putranjivaceae Drypetes afzelii (Pax) Hutch. Putranjivaceae Drypetes capillipes (Pax) Pax & K. Hoffm. Putranjivaceae Drypetes chevalieri Beille Putranjivaceae Drypetes gossweileri S. Moore Putranjivaceae Drypetes klainei Pierre ex Pax Putranjivaceae Drypetes laciniata (Pax) Hutch. Putranjivaceae Drypetes molunduana Pax & K. Hoffm. Putranjivaceae 7 8 Sonké B, Couvreur T Drypetes paxii Hutch. Putranjivaceae Drypetes staudtii (Pax) Hutch. Putranjivaceae Duboscia macrocarpa A. Chev. Malvaceae Duguetia staudtii (Engl. & Diels) Chatrou Annonaceae Elaeophorbia grandifolia (Haw.) Croizat Euphorbiaceae Entada gigas (L.) Fawc. & Rendle Fabaceae Entandrophragma angolense (Welw. ex C. DC.) C. DC. Meliaceae Entandrophragma candollei Harms Meliaceae Entandrophragma cylindricum (Sprague) Sprague Meliaceae Eribroma oblongum (Mast.) Pierre ex A. Chev. Malvaceae Eriocoelum macrocarpum Gilg ex Radlk. Sapindaceae Erismadelphus exsul Mildbr. Vochysiaceae Erythrophleum suaveolens (Guill. & Perr.) Brenan Fabaceae Fernandoa adolphi-friderici (Gilg & Mildbr.) Heine Bignoniaceae Ficus exasperata Vahl Moraceae Ficus mucuso Welw. ex Ficalho Moraceae Ficus sur Forssk. Moraceae Funtumia africana (Benth.) Stapf Apocynaceae Funtumia elastica (Preuss) Stapf Apocynaceae Garcinia kola Heckel Clusiaceae Garcinia gnetoides Hutch. & Dalziel Clusiaceae Garcinia mannii Oliv. Clusiaceae Garcinia punctata Oliv. Clusiaceae Garcinia smeathmannii (Planch. & Triana) Oliv. Clusiaceae Gilbertiodendron dewevrei (De Wild.) J. Léonard Fabaceae Glyphaea brevis (Spreng.) Monach. Malvaceae Gossweilerodendron joveri Normand ex Aubrév. Fabaceae Greenwayodendron suaveolens (Engl. & Diels) Verdc. Annonaceae Grewia brunnea K. Schum. Malvaceae Grewia coriacea Mast. Malvaceae Grewia oligoneura Sprague Malvaceae Guarea cedrata (A. Chev.) Pellegr. Meliaceae Guarea thompsonii Sprague & Hutch. Meliaceae Harungana madagascariensis Lam. ex Poir. Hypericaceae Heinsia crinita (Afzel.) G. Taylor Rubiaceae Heisteria trillesiana Pierre Olacaceae Heisteria zimmereri Engl. Olacaceae Hexalobus crispiflorus A. Rich. Annonaceae Homalium discophylum Jacq. Salicaceae Homalium le-testui Pellegr. Salicaceae Hylodendron gabunense Taub. Fabaceae Hymenocardia lyrata Tul. Phyllanthaceae Hymenostegia afzelii (Oliv.) Harms Fabaceae Tree diversity of the Dja Faunal Reserve, southeastern Cameroon Irvingia excelsa Mildbr. Irvingiaceae Irvingia gabonensis (Aubry-Lecomte ex O'Rorke) Baill. Irvingiaceae Irvingia grandifolia (Engl.) Engl. Irvingiaceae Irvingia robur Mildbr. Irvingiaceae Keayodendron bridelioides (Gilg & Mildbr. ex Hutch. & Dalziel) Leandri Phyllanthaceae Khaya ivorensis A. Chev. Meliaceae Klaineanthus gaboniae Pierre ex Prain Euphorbiaceae Klainedoxa gabonensis Pierre ex Engl. Irvingiaceae Klainedoxa microphylla A.H. Gentry Irvingiaceae Lannea welwitschii (Hiern) Engl. Anacardiaceae Lasiodiscus mannii Hook. f. Rhamnaceae Lecaniodiscus cupanioides Planch. ex Benth. Sapindaceae Lepidobotrys staudtii Engl. Lepidobotryaceae Leptactina involucrata Hook. f. Rubiaceae Lindackeria echinata C. Presl Achariaceae Lovoa trichilioides Harms Meliaceae Macaranga barteri Müll. Arg. Euphorbiaceae Macaranga occidentalis (Müll. Arg.) Müll. Arg. Euphorbiaceae Macaranga spinosa Müll. Arg. Euphorbiaceae Maesobotrya klaineana (Pierre) J. Léonard Phyllanthaceae Maesopsis eminii Engl. Rhamnaceae Mammea africana G. Don Calophyllaceae Manilkara letouzei Aubrév. Sapotaceae Manilkara obovata (Sabine & G. Don) J.H. Hemsl. Sapotaceae Maprounea membranacea Pax & K. Hoffm. Euphorbiaceae Maranthes chrysophylla (Oliv.) Prance Chrysobalanaceae Maranthes glabra (Oliv.) Prance Chrysobalanaceae Mareyopsis longifolia (Pax) Pax & K. Hoffm. Euphorbiaceae Margaritaria discoidea (Baill.) G.L. Webster Phyllanthaceae Markhamia lutea (Benth.) K. Schum. Bignoniaceae Massularia acuminata (G. Don) Bullock ex Hoyle Rubiaceae Memecylon afzelii G. Don Melastomataceae Microdesmis puberula Hook. f. ex Planch. Pandaceae Microdesmis zenkeri Pax Pandaceae Milicia excelsa (Welw.) C.C. Berg Moraceae Millettia laurentii De Wild. Fabaceae Millettia sanagana Harms Fabaceae Mitragyna stipulosa (DC.) Kuntze Rubiaceae Monodora myristica (Gaertn.) Dunal Annonaceae Monodora tenuifolia Benth. Annonaceae Musanga cecropioides R. Br. ex Tedlie Urticaceae Myrianthus arboreus P. Beauv. Urticaceae Nauclea diderrichii (De Wild.) Merr. Rubiaceae 9 10 Sonké B, Couvreur T Nauclea pobeguinii (Hua ex Pobég.) Merr. Rubiaceae Nesogordonia papaverifera (A. Chev.) Capuron ex N. Hallé Malvaceae Ochna calodendron Gilg & Mildbr. Ochnaceae Odyendyea gabonensis (Pierre) Engl. Simaroubaceae Omphalocarpum elatum Miers Sapotaceae Omphalocarpum lecomteanum Pierre ex Engl. Sapotaceae Oncoba echinata Oliv. Salicaceae Oncoba gilgiana Sprague Salicaceae Oncoba glauca (P. Beauv.) Planch. Salicaceae Oncoba welwitschii Oliv. Salicaceae Ongokea gore (Hua) Pierre Olacaceae Ophiobotrys zenkeri Gilg Salicaceae Oxyanthus speciosus DC. Rubiaceae Pancovia pedicellaris Radlk. & Gilg Sapindaceae Panda oleosa Pierre Pandaceae Parinari excelsa Sabine Chrysobalanaceae Parkia bicolor A. Chev. Fabaceae Pauridiantha callicarpoides (Hiern) Bremek. Rubiaceae Pauridiantha efferata N. Hallé Rubiaceae Pauridiantha floribunda (K. Schum. & K. Krause) Bremek. Rubiaceae Pausinystalia macroceras (K. Schum.) Pierre Rubiaceae Pentaclethra macrophylla Benth. Fabaceae Pentadesma butyracea Sabine Clusiaceae Persea americana Mill. Lauraceae Petersianthus macrocarpus (P. Beauv.) Liben Lecythidaceae Phyllocosmus africanus (Hook. f.) Klotzsch Ixonanthaceae Phyllocosmus sessiliflorus Oliv. Ixonanthaceae Picralima nitida (Stapf) T. Durand & H. Durand Apocynaceae Piptadeniastrum africanum (Hook. f.) Brenan Fabaceae Plagiostyles africana (Müll. Arg.) Prain Euphorbiaceae Pouteria altissima (A. Chev.) Baehni Sapotaceae Pouteria pierrei (A. Chev.) E.O. Beal Sapotaceae Pseudospondias microcarpa (A. Rich.) Engl. Anacardiaceae Psidium guajava L. Myrtaceae Pteleopsis hylodendron Mildbr. Combretaceae Pterocarpus mildbraedii Harms Fabaceae Pterocarpus soyauxii Taub. Fabaceae Pterygota bequaertii De Wild. Malvaceae Pycnanthus angolensis (Welw.) Warb. Myristicaceae Quassia undulata (Guill. & Perr.) D. Dietr. Simaroubaceae Raphia monbuttorum Drude Arecaceae Raphia regalis Becc. Arecaceae Rauvolfia caffra Sond. Apocynaceae Tree diversity of the Dja Faunal Reserve, southeastern Cameroon Rauvolfia vomitoria Wennberg Apocynaceae Rhabdophyllum bracteolatum (Gilg) Farron Ochnaceae Ricinodendron heudelotii (Baill.) Pierre ex Pax Euphorbiaceae Rinorea longifolia De Wild. Violaceae Rinorea oblongifolia (C.H. Wright) Marquand ex Chipp Violaceae Rinorea spongiocarpa Achound. Violaceae Rinorea subsessilis M. Brandt Violaceae Rinorea welwitschii Kuntze Violaceae Rothmannia lateriflora (K. Schum.) Keay Rubiaceae Rothmannia lujae (De Wild.) Keay Rubiaceae Santiria trimera (Oliv.) Aubrév. Burseraceae Sapium ellipticum (Hochst.) Pax Euphorbiaceae Schrebera arborea A. Chev. Oleaceae Scottellia klaineana Pierre Achariaceae Sorindeia grandifolia Engl. Anacardiaceae Spathodea campanulata P. Beauv. Bignoniaceae Staudtia kamerunensis Warb. Myristicaceae Sterculia tragacantha Lindl. Malvaceae Streblus usambarensis (Engl.) C.C. Berg Moraceae Strephonema pseudo-cola A. Chev. Combretaceae Strombosia grandifolia Hook. f. Olacaceae Strombosia pustulata Oliv. Olacaceae Strombosia scheffleri Engl. Olacaceae Strombosia zenkeri Engl. Olacaceae Strombosiopsis tetrandra Engl. Olacaceae Symphonia globulifera L. f. Clusiaceae Synsepalum brevipes (Baker) T.D. Penn. Sapotaceae Synsepalum dulcificum (Schumach. & Thonn.) Daniell Sapotaceae Synsepalum longecuneatum De Wild. Sapotaceae Syzygium guineense (Willd.) DC. Myrtaceae Syzygium rowlandii Sprague Myrtaceae Tabernaemontana citrifolia L. Apocynaceae Tabernaemontana crassa Benth. Apocynaceae Tapura africana Oliv. Dichapetalaceae Teclea afzelii Engl. Rutaceae Terminalia superba Engl. & Diels Combretaceae Tessmannia africana Harms Fabaceae Tetracera alnifolia Willd. Dilleniaceae Tetracera stuhlmanniana Gilg Dilleniaceae Tetrapleura tetraptera (Schumach. & Thonn.) Taub. Fabaceae Tetrorchidium didymostemon (Baill.) Pax & K. Hoffm. Euphorbiaceae Treculia africana Decne. ex Trécul Moraceae Trema orientalis (L.) Blume Cannabaceae 11 12 Sonké B, Couvreur T Tricalysia anomala E.A. Bruce Rubiaceae Tricalysia crepiniana De Wild. & T. Durand Rubiaceae Tricalysia discolor Brenan Rubiaceae Trichilia monadelpha (Thonn.) J.J. de Wilde Meliaceae Trichilia prieuriana A. Juss. Meliaceae Trichilia rubescens Oliv. Meliaceae Trichilia tessmannii Harms Meliaceae Trichilia welwitschii C. DC. Meliaceae Trichoscypha acuminata Engl. Anacardiaceae Trichoscypha arborea A. Chev. Anacardiaceae Tridesmostemon omphalocarpoides Engl. Sapotaceae Trilepisium madagascariense DC. Moraceae Triplochiton scleroxylon K. Schum. Malvaceae Turraeanthus africana (Welw. ex C. DC.) Pellegr. Meliaceae Uapaca acuminata (Hutch.) Pax & K. Hoffm. Phyllanthaceae Uapaca guineensis Müll. Arg. Phyllanthaceae Uapaca paludosa Aubrév. & Leandri Phyllanthaceae Uapaca staudtii Pax Phyllanthaceae Uapaca vanhouttei De Wild. Phyllanthaceae Uvariopsis dioica (Diels) Robyns & Ghesq. Annonaceae Vepris louisii G.C.C. Gilbert Rutaceae Vitex grandifolia Gürke Lamiaceae Vitex rivularis Gürke Lamiaceae Vitex thyrsiflora Baker Lamiaceae Vitex zenkeri Gürke Lamiaceae Xylopia aethiopica (Dunal) A. Rich. Annonaceae Xylopia hypolampra Mildbr. Annonaceae Xylopia parviflora (Guill. & Perr.) Engl. & Diels Annonaceae Xylopia quintasii Pierre ex Engl. & Diels Annonaceae Xylopia rubescens Oliv. Annonaceae Zanthoxylum gilletii (De Wild.) P.G. Waterman Rutaceae Zanthoxylum heitzii (Aubrév. & Pellegr.) P.G.Waterman Rutaceae Tree diversity of the Dja Faunal Reserve, southeastern Cameroon a Figure 2. Selected species found in the Dja Faunal Reserve (1). (Photos: TLP Couvreur) a: Monodora myristica (Annonaceae) b: Amphimas pterocarpoides (Fabaceae) 13 b Sonké B, Couvreur T 14 a b c d Figure 3. Selected species from the Dja Faunal Reserve (2). (Photos: a, b: TLP Couvreur; c, d: B Sonké) a: Greenwayodendron suaveolens (Annonaceae) b: Annickia affinis (Annonaceae) c: Rothmannia lateriflora (Rubiaceae) d: Pauridiantha floribunda (Rubiaceae) Of the 54 families Fabaceae, Rubiaceae and Malvaceae were the most species rich (Table 2) whereas Fabaceae, Phyllantaceae and Ochnaceae were the most abundant families in terms of individuals sampled (Table 3, Fig. 4, Suppl. material 3). Finally, Tabernaemontana crassa (Apocynaceae) was the most abundant species recorded for the reserve with 633 individuals tagged (Table 4). Species diversity and abundance per family for each transect is given in Table 5. Table 2. Ten most species rich families in the Dja Faunal Reserve (excluding non identified taxa (sp.)). Position Family 1 Fabaceae Species richness 37 2 Rubiaceae 24 3 Malvaceae 23 Tree diversity of the Dja Faunal Reserve, southeastern Cameroon 4 Euphorbiaceae 18 5 Sapotaceae 16 6 Annonaceae 15 7 Meliaceae 14 8 Phyllanthaceae 13 9 Putranjivaceae 11 10 Clusiaceae 9 Table 3. Ten most abundant families in terms of individuals inventoried. Family Family abundance Fabaceae 1203 Phyllanthaceae 1011 Olacaceae 830 Annonaceae 826 Euphorbiaceae 794 Apocynaceae 775 Meliaceae 605 Rubiaceae 446 Burseraceae 436 Malvaceae 396 Table 4. Twenty most abundant species in the Dja Faunal Reserve. Position Species Species abundance 1 Tabernaemontana crassa 633 2 Petersianthus macrocarpus 382 3 Santiria trimera 349 4 Greenwayodendron suaveolens 332 5 Uapaca guineensis 330 6 Uapaca paludosa 260 7 Strombosiopsis tetrandra 240 7 Pentaclethra macrophylla 240 7 Plagiostyles africana 240 8 Desbordesia glaucescens 210 9 Trichilia rubescens 206 10 Dichostemma glaucescens 197 11 Rinorea oblongifolia 189 12 Anonidium mannii 181 13 Strombosia pustulata 172 14 Heisteria trillesiana 156 15 Sonké B, Couvreur T 16 15 Coelocaryon preussii 152 16 Carapa procera 136 17 Anthonotha macrophylla 134 18 Corynanthe pachyceras 131 19 Trichoscypha acuminata 128 20 Antidesma laciniatum 124 Table 5. Tree diversity and abundance among the nine transects in the Dja Faunal Reserve. Family and species are ordered alphabetically. Family/species Plot number L1 Achariaceae L2 L3 L4 2 2 1 L5 L6 L7 2 Buchnerodendron speciosum L8 L9 1 8 1 1 1 Lindackeria echinata 2 2 Agavaceae 2 1 1 Dracaena arborea 2 1 1 Anacardiaceae 61 60 43 Antrocaryon klaineanum 1 Scottellia klaineana 1 1 1 6 1 5 1 42 26 32 5 32 22 1 Antrocaryon micraster 1 Lannea welwitschii 6 1 2 1 4 3 2 6 3 2 21 339 1 3 1 1 3 14 2 39 3 96 Pseudospondias microcarpa 14 Sorindeia grandifolia 19 29 16 13 5 4 7 Sorindeia sp. 6 4 6 4 4 6 1 11 4 46 Trichoscypha acuminata 20 22 15 17 13 15 11 8 7 128 Trichoscypha arborea 1 1 6 1 12 Anisophylleaceae 1 2 2 2 3 10 Anopyxis klaineana 1 2 2 2 3 Annonaceae 136 112 103 69 75 97 64 99 71 Annickia affinis 9 17 9 5 7 10 11 14 6 88 Anonidium mannii 53 22 19 3 21 14 9 13 27 181 4 1 5 5 5 4 4 6 4 4 2 2 36 3 1 Cleistopholis glauca Cleistopholis patens 3 Total 10 826 11 Duguetia staudtii 4 3 5 3 4 4 2 2 2 29 Greenwayodendron suaveolens 46 37 42 28 22 45 27 55 30 332 Hexalobus crispiflorus 6 3 1 1 1 1 1 Monodora tenuifolia 1 3 Uvariopsis dioica 1 3 2 Xylopia aethiopica 2 2 3 Xylopia hypolampra 14 1 Monodora myristica 1 2 1 1 2 2 3 9 8 14 2 14 1 2 Tree diversity of the Dja Faunal Reserve, southeastern Cameroon 4 2 Xylopia quintasii 6 6 12 7 Xylopia rubescens 1 4 4 2 Xylopia sp. 2 1 Apocynaceae 73 145 Alstonia boonei 5 2 Xylopia parviflora 3 2 5 2 7 5 1 11 9 2 Rauvolfia caffra 1 1 18 36 79 133 124 71 82 32 775 5 1 4 10 7 5 6 2 45 1 1 5 2 1 16 25 6 5 2 64 3 2 4 5 2 1 1 17 1 2 1 5 2 1 Rauvolfia vomitoria 1 3 9 5 2 Strophanthus sp. 1 1 1 Tabernaemontana citrifolia Tabernaemontana crassa 57 1 Landolphia sp. Picralima nitida 3 2 Funtumia africana Funtumia elastica 17 63 132 1 32 66 100 87 59 Tabernanthe sp. 67 27 1 Arecaceae 10 2 17 38 1 Raphia monbuttorum 10 2 17 38 1 633 1 25 93 25 25 68 Raphia regalis Asteraceae 1 1 Vernonia sp. 1 1 Bignoniaceae 2 2 1 8 Fernandoa adolfi-friderici 1 2 1 1 Markhamia lutea 1 7 3 8 3 1 1 2 1 1 2 1 1 Burseraceae 64 63 Canarium schweinfurthii 1 1 50 43 Dacryodes buettneri Dacryodes edulis 17 6 2 1 4 31 8 2 19 1 4 2 2 9 2 2 5 4 46 51 30 40 1 2 2 2 10 1 10 14 49 436 9 11 2 1 4 1 Dacryodes klaineana Dacryodes sp. 4 3 1 3 Cordia aurantiaca Cordia platythyrsa 1 6 Spathodea campanulata Boraginaceae 3 2 60 1 1 6 Santiria trimera 45 56 44 38 24 34 26 37 45 349 Calophyllaceae 6 4 7 2 4 4 6 3 3 39 Mammea africana 6 4 7 2 4 4 6 3 3 39 Cannabaceae 69 28 13 10 11 35 24 9 16 215 1 1 Celtis adolfi-friderici 1 Celtis gomphophylla 1 Celtis tessmannii 19 17 5 5 Celtis zenkeri 50 11 7 5 Trema orientalis 11 7 19 8 11 28 5 1 1 102 108 3 3 18 Sonké B, Couvreur T Celastraceae 8 7 5 3 7 30 Salacia sp. 8 7 5 3 7 30 Centroplacaceae 6 6 12 4 1 5 Centroplacus glaucinus 6 6 12 4 1 5 34 Chrysobalanaceae 17 11 7 12 19 79 Acioa sp. 1 3 6 1 2 1 8 2 Maranthes glabra 12 4 3 2 2 Maranthes sp. 5 4 2 2 Maranthes chrysophylla 2 Parinari excelsa Parinari sp. 4 2 14 25 1 26 1 1 1 2 18 1 1 1 2 7 162 1 1 Clusiaceae 22 20 38 16 8 5 19 19 15 Allanblackia floribunda 13 5 6 8 6 1 8 2 10 Allanblackia gabonensis 2 Garcinia gnetoides Garcinia kola 1 Garcinia mannii 4 1 4 6 1 12 9 8 2 2 5 2 2 Symphonia globulifera 4 1 10 Combretaceae 3 8 2 10 5 1 2 1 4 Combretum sp. 1 12 1 1 1 3 1 3 2 4 8 3 32 5 6 4 5 55 1 1 1 15 8 6 1 Strephonema pseudo-cola Strephonema sp. 1 2 1 Tapura africana 1 Dilleniaceae 2 Tetracera alnifolia 1 4 Ebenaceae 17 Diospyros bipindensis 1 14 6 1 4 5 3 4 1 5 3 10 3 4 5 3 3 6 17 16 10 10 3 14 104 1 5 3 Diospyros cinnabarina 3 1 Diospyros conocarpa 27 1 1 Tetracera stuhlmanniana 1 3 2 Dichapetalaceae 1 1 Diospyros crassiflora Diospyros hoyleana 4 4 2 Diospyros sp. 4 4 1 1 Diospyros suaveolens 8 5 Euphorbiaceae 32 82 80 Cavacoa quintasii 45 11 2 Pentadesma butyracea Terminalia superba 1 11 Garcinia smeathmannii Pteleopsis hylodendron 59 1 Garcinia punctata Garcinia sp. 34 3 2 7 13 23 5 5 1 6 7 2 1 2 1 1 2 9 2 5 32 84 100 29 133 139 81 760 17 27 17 Tree diversity of the Dja Faunal Reserve, southeastern Cameroon 1 Croton oligandrus Dichostemma glaucescens 12 Discoglypremna caloneura 4 37 1 38 32 55 4 13 6 197 2 5 4 3 3 1 22 2 1 7 11 1 7 13 57 1 Elaeophorbia grandifolia 1 Hymenocardia sp. 1 5 Klaineanthus gaboniae 6 1 1 2 11 3 11 2 Macaranga barteri 2 Macaranga occidentalis Macaranga sp. Macaranga spinosa 1 1 Crotonogyne preussii Hymenocardia lyrata 11 3 2 4 2 10 2 2 1 12 1 4 1 12 21 1 Ricinodendron heudelotii 3 28 2 1 Tetrorchidium didymostemon 181 156 164 21 5 1 22 1 99 4 86 103 43 240 2 2 3 15 1 1 1 5 123 130 4 4 9 107 2 1 6 101 2 2 1 3 1 3 5 1 1 1 1 Albizia zygia 4 Amphimas ferrugineus 2 Amphimas pterocarpoides 1 Angylocalyx pynaertii 8 Angylocalyx sp. 7 13 4 1 1 8 1 4 2 1 6 1 12 75 2 1 6 13 10 1 1 1 13 18 1 3 9 13 3 1 39 3 26 38 19 10 12 Anthonotha sp. 7 10 1 1 3 2 134 2 1 Balanites wilsoniana 7 1 1 Anthonotha fragrans 10 4 1 3 3 Albizia gummifera 1203 17 1 Albizia ferruginea Anthonotha macrophylla 84 1 1 Afzelia bipindensis Anthonotha cladantha 157 15 1 Afzelia bella 3 1 1 1 1 Sapium ellipticum Albizia sp. 53 1 Plagiostyles africana Albizia glaberrima 12 1 3 Maprounea sp. Albizia adianthifolia 2 3 Mareyopsis longifolia 5 4 Maprounea membranacea Fabaceae 19 1 Baphia sp. 1 Calpocalyx dinklagei 8 8 13 20 10 3 12 5 89 Cylicodiscus gabunensis 3 5 1 1 5 1 2 2 20 Detarium macrocarpum 1 1 1 3 3 2 1 12 1 Dialium bipindense Dialium dinklagei 4 2 1 10 1 1 1 8 20 Sonké B, Couvreur T 1 Dialium guineense 1 6 3 3 15 16 1 8 8 6 1 2 62 2 1 13 7 42 1 3 5 16 1 6 Dialium zenkeri 3 3 15 Distemonanthus benthamianus 15 4 Entada gigas 2 5 Erythrophleum suaveolens 4 6 6 8 Gilbertiodendron dewevrei 19 12 36 1 53 9 3 1 8 5 9 8 2 2 Millettia sanagana 1 2 2 1 4 Newtonia sp. 1 1 Oddoniodendron sp. 1 3 1 1 24 29 14 19 25 23 240 1 1 1 2 9 2 7 30 4 2 3 41 5 10 10 7 4 11 76 1 6 5 15 31 1 7 1 16 Pentaclethra macrophylla 44 Piptadeniastrum africanum 7 Pterocarpus mildbraedii 16 12 1 3 Pterocarpus soyauxii 15 7 7 2 4 1 4 Tessmannia africana 1 31 Parkia bicolor 31 77 1 2 Millettia laurentii Tetrapleura tetraptera 4 1 Hymenostegia afzelii Millettia sp. 3 52 1 Gossweilerodendron joveri Hylodendron gabunense 2 Hypericaceae 3 Harungana madagascariensis 3 5 3 3 Irvingiaceae 34 40 49 62 42 43 34 44 37 385 Desbordesia glaucescens 13 31 25 43 25 28 12 16 17 210 1 2 Irvingia gabonensis 11 4 15 8 10 4 12 10 8 82 Irvingia grandifolia 4 2 2 3 2 5 1 3 3 25 1 Irvingia excelsa Irvingia robur 1 Irvingia sp. 1 Klainedoxa gabonensis 3 2 Klainedoxa microphylla 3 1 6 Ixonanthaceae 4 Oubanguia sp. 1 8 5 6 1 1 5 13 7 55 2 2 1 9 1 3 8 1 1 2 1 Phyllocosmus africanus 3 Phyllocosmus sessiliflorus 3 Phyllocosmus sp. Lauraceae 4 5 3 3 Beilschmiedia sp. 4 5 3 3 2 2 3 6 5 2 6 37 2 6 1 2 6 32 1 Persea americana 4 5 Lecythidaceae 101 47 19 8 81 51 34 20 21 Petersianthus macrocarpus 101 47 19 8 81 51 34 20 21 382 382 Lepidobotryaceae 15 21 12 5 4 5 7 13 2 84 Tree diversity of the Dja Faunal Reserve, southeastern Cameroon Lepidobotrys staudtii 15 Loganiaceae 1 21 Strychnos sp. 1 Malvaceae 39 56 1 1 12 45 5 45 4 55 Bombax brevicuspe Bombax buonopozense Ceiba pentandra 2 Chlamydocola chlamydantha 1 4 6 Cola acuminata 5 7 1 1 1 1 35 63 49 1 3 5 9 2 2 6 3 3 1 2 7 2 1 1 13 13 1 3 3 3 5 37 1 1 4 6 1 3 1 11 6 6 2 Cola sp. 8 4 10 16 1 1 7 12 4 12 4 7 9 6 6 Cola verticillata 11 11 10 4 9 11 6 2 1 2 3 1 1 Glyphaea brevis 8 2 1 9 2 3 1 1 1 4 3 1 7 7 8 1 3 1 2 2 4 7 1 Triplochiton scleroxylon 11 1 1 3 7 1 1 3 4 47 4 8 3 3 3 3 3 71 67 71 605 16 22 5 7 3 2 2 4 3 97 98 57 23 56 Carapa procera 36 27 19 1 Entandrophragma angolense 4 1 Entandrophragma candollei 4 2 1 Entandrophragma cylindricum 2 2 Entandrophragma sp. 4 2 Guarea cedrata 2 1 Guarea thompsonii 3 1 2 10 136 9 5 5 19 3 2 17 2 18 36 8 6 20 4 2 36 6 2 1 1 2 1 1 10 1 7 2 65 Memecylon afzelii 1 2 1 Melastomataceae Khaya ivorensis 76 2 1 Pterygota sp. Lovoa trichilioides 3 6 Octolobus sp. Meliaceae 1 49 5 Nesogordonia papaverifera Sterculia tragacantha 1 1 2 Grewia sp. 61 2 Grewia oligoneura Pterygota bequaertii 2 2 Grewia coriacea Leptonichia sp. 38 3 Desplatsia dewevrei 6 16 1 5 Eribroma oblongum 418 1 4 Grewia brunnea 31 2 Cola lateritia Duboscia macrocarpa 84 2 9 Cola flavo-velutina Desplatsia chrysochlamys 2 1 Cola altissima Cola ballayi 13 21 1 6 4 22 Sonké B, Couvreur T 2 Trichilia monadelpha 2 11 2 Trichilia prieuriana 33 46 24 8 26 26 25 Trichilia sp. 1 1 1 3 2 1 2 Trichilia tessmannii 3 Turraeanthus africana 1 Moraceae 75 Ficus exasperata 2 17 6 2 7 9 10 3 18 21 4 15 49 1 50 4 2 11 22 4 30 176 2 11 6 11 1 Ficus sur Streblus usambarensis Treculia africana 7 5 Trilepisium madagascariense 65 12 Myristicaceae 65 19 Coelocaryon botryoides 1 1 2 6 7 19 9 4 2 4 2 2 2 1 6 41 13 65 206 1 7 1 25 3 1 Ficus mucuso Milicia excelsa 9 3 Trichilia rubescens Trichilia welwitschii 1 1 1 1 2 12 15 28 3 2 25 2 88 29 48 308 1 Coelocaryon preussii 38 5 7 2 17 5 39 11 28 Pycnanthus angolensis 8 6 3 3 9 1 9 2 8 49 Staudtia kamerunensis 18 8 9 4 15 7 17 16 12 106 Myrsinaceae 1 Embelia sp. 1 1 Myrtaceae 5 6 4 9 Eugenia sp. 4 2 3 3 2 4 1 3 1 7 8 6 4 1 Psidium guajava 4 Syzygium rowlandii Syzygium sp. 1 Ochnaceae 4 1 6 2 2 48 23 1 1 Syzygium guineense 152 1 2 1 4 22 1 1 4 6 1 5 2 3 2 Ochna calodendron 26 2 Rhabdophyllum bracteolatum 4 1 4 6 1 3 2 3 24 Olacaceae 95 82 108 82 104 80 73 106 100 830 Heisteria trillesiana 41 16 22 7 51 16 2 Heisteria zimmereri 2 4 Ongokea gore 5 1 4 2 Strombosia grandifolia 1 1 2 1 Strombosia pustulata 13 7 30 27 19 25 7 18 26 172 Strombosia scheffleri 4 16 21 9 1 14 5 12 1 83 1 2 27 2 34 2 19 Strombosia sp. Strombosiopsis tetrandra 4 1 5 Strombosia zenkeri 29 36 1 156 26 24 35 92 1 2 2 1 22 2 9 4 9 29 1 24 35 22 46 27 240 Oleaceae 1 1 Schrebera arborea 1 1 Tree diversity of the Dja Faunal Reserve, southeastern Cameroon Pandaceae 9 10 6 4 5 13 8 8 14 2 5 Passifloraceae 5 3 3 4 1 3 9 7 8 4 1 9 1 7 26 7 58 1 11 4 Barteria nigritana subsp. fistulosa 86 1 1 Microdesmis zenkeri Panda oleosa 6 1 Microdesmis puberula Microdesmis sp. 12 23 4 19 4 1 9 1 170 90 77 124 68 107 171 77 1011 8 22 18 31 4 4 15 16 6 124 3 5 2 6 2 9 4 4 35 Phyllanthaceae 127 Antidesma laciniatum Antidesma membranaceum Antidesma sp. 2 1 4 2 Antidesma venosum 2 Bridelia grandis 2 19 1 11 1 9 1 1 1 7 1 4 15 16 Bridelia micrantha 9 2 16 Keayodendron bridelioides 5 4 3 5 4 4 1 7 2 Maesobotrya klaineana 6 11 3 4 5 4 3 8 4 48 3 3 1 20 Maesobotrya sp. Margaritaria discoidea 1 1 1 3 Uapaca acuminata 16 21 2 19 3 Uapaca guineensis 18 72 37 24 12 22 31 87 27 330 Uapaca paludosa 60 30 22 4 74 25 13 12 20 260 1 3 10 6 20 9 1 3 14 30 46 30 320 Uapaca staudtii Uapaca vanhouttei 1 Putranjivaceae 35 17 84 1 Drypetes aframensis 61 13 13 35 4 7 7 68 2 10 1 Drypetes africana 1 Drypetes afzelii 1 1 Drypetes capillipes 5 5 Drypetes chevalieri 6 Drypetes gossweileri 2 1 10 5 2 4 5 Drypetes klainei 1 Drypetes laciniata 1 1 1 Drypetes molunduana Drypetes paxii 1 Drypetes sp. 22 14 66 41 12 2 Drypetes staudtii 4 1 5 6 1 1 Rhamnaceae 1 7 17 13 4 3 Lasiodiscus mannii 1 4 16 13 2 3 3 1 34 29 64 61 30 40 4 3 4 Maesopsis eminii Rubiaceae Aulacocalyx jasminiflora 5 3 7 1 1 20 244 1 19 1 2 3 2 1 27 2 40 3 5 55 3 4 46 1 9 59 57 72 446 17 12 52 81 1 1 16 2 Aidia micrantha Aoranthe cladantha 22 3 24 Sonké B, Couvreur T 2 Belonophora coriacea 1 Brenania brieyi 3 1 2 Canthium sp. 2 4 1 Corynanthe pachyceras 6 8 32 Cuviera cuvieroides 1 2 1 2 2 2 4 1 23 7 5 6 7 1 9 2 4 Cuviera sp. Heinsia crinita 1 2 5 2 3 1 1 5 3 3 Rothmannia lujae 4 5 3 4 15 1 2 1 1 6 1 1 1 3 3 1 2 1 2 1 1 1 2 6 1 2 3 6 7 5 3 2 5 1 1 Tricalysia crepiniana 1 1 6 3 1 3 Tricalysia sp. 22 3 4 4 2 1 6 6 6 10 1 1 2 3 2 7 3 23 Casearia barteri Homalium discophylum 2 2 4 3 6 5 3 22 19 22 21 19 11 6 16 2 4 2 4 7 9 4 4 1 Zanthoxylum heitzii 4 2 3 4 5 8 3 4 4 2 3 1 2 Oncoba sp. 1 35 1 1 2 6 1 1 5 47 1 6 4 1 8 12 12 2 2 1 3 1 Oncoba welwitschii 143 41 Oncoba gilgiana Oncoba glauca 36 5 1 Homalium le-testui Homalium sp. 48 1 Teclea afzelii Vepris louisii 20 1 1 Clausena anisata 38 6 1 7 11 11 2 Tricalysia anomala Ophiobotrys zenkeri 4 1 Rothmannia lateriflora Ophiobotrys sp. 1 2 1 5 1 Oncoba echinata 26 1 5 Pavetta sp. Salicaceae 131 1 Pausinystalia macroceras Zanthoxylum gilletii 3 1 1 Pauridiantha efferata Rutaceae 16 26 1 2 Pauridiantha callicarpoides 14 9 Nauclea pobeguinii Tricalysia discolor 2 1 1 Nauclea diderrichii Pauridiantha floribunda 1 2 1 Massularia acuminata Oxyanthus speciosus 21 3 1 Leptactina involucrata Mitragyna stipulosa 2 1 Bertiera racemosa 1 2 2 2 Tree diversity of the Dja Faunal Reserve, southeastern Cameroon Sapindaceae 33 34 23 67 14 35 18 13 8 8 6 19 2 Blighia sp. Blighia welwitschii 21 3 11 12 1 9 5 6 5 1 Chytranthus sp. 6 1 1 8 Eriocoelum macrocarpum 4 8 8 2 1 Lecaniodiscus cupanioides 2 1 5 2 Sapotaceae 26 17 Afrosersalisia sp. 3 Autranella congolensis 3 2 3 5 7 9 6 31 5 7 3 43 22 7 12 16 32 1 24 7 1 27 5 17 165 52 4 1 1 Chrysophyllum boukokoense 1 1 1 Chrysophyllum lacourtianum 9 7 1 Chrysophyllum pruniforme 1 1 2 2 1 2 3 1 1 2 9 1 1 3 8 1 3 1 34 5 1 3 1 5 7 4 1 21 2 1 2 1 2 1 1 2 2 Omphalocarpum lecomteanum 1 Pouteria altissima 1 1 Manilkara obovata Manilkara sp. 10 5 Chrysophyllum sp. Manilkara letouzei 1 1 1 1 1 47 1 Chrysophyllum africanum Letestua sp. 81 1 1 Chytranthus macrobotrys Omphalocarpum elatum 2 1 Pancovia pedicellaris 270 4 1 Chytranthus atroviolaceus Baillonella toxisperma 9 4 Allophylus africanus Blighia sapida 34 25 2 1 1 1 2 1 Pouteria pierrei Pouteria sp. 1 Synsepalum brevipes 1 1 3 4 1 14 23 Synsepalum dulcificum 6 1 23 Synsepalum longecuneatum 2 3 3 3 2 Tridesmostemon omphalocarpoides 2 1 3 4 1 6 18 Simaroubaceae 8 2 1 1 2 3 6 5 28 Odyendyea gabonensis 8 2 1 1 2 2 6 5 1 1 Quassia undulata Urticaceae 17 Musanga cecropioides 12 14 Myrianthus arboreus 5 14 Verbenaceae 3 5 Vitex rivularis 2 5 Vitex sp. 1 1 27 1 5 12 6 45 2 7 1 21 2 59 161 57 1 3 5 5 24 2 2 100 61 1 4 1 6 2 3 25 1 Vitex grandifolia 3 1 1 1 11 2 2 6 Sonké B, Couvreur T 26 1 Vitex thyrsiflora 1 5 Vitex zenkeri Violaceae 26 Rinorea longifolia 1 Rinorea oblongifolia 23 1 6 16 18 13 3 11 30 50 28 195 15 18 12 3 11 30 49 28 189 1 1 Rinorea spongiocarpa 1 1 Rinorea subsessilis 1 2 Rinorea welwitschii 2 Vochysiaceae 2 4 18 1 3 1 2 31 2 Erismadelphus exsul 2 4 18 1 3 1 2 31 Total 1579 1472 1299 1238 1100 1311 1155 11546 1147 1245 Figure 4. Plant family abundance in the Dja Faunal Reserve. This table was produced from Suppl. material 3. Traits coverage The only trait measured and published in this dataset is the diameter at breast height for each individual found in Suppl. material 1. Temporal coverage Data range: 1993 8 01 - 1995 8 31. Usage rights Use license: Creative Commons CCZero IP rights notes: This dataset can be freely used provided it is cited Tree diversity of the Dja Faunal Reserve, southeastern Cameroon 27 Data resources Data package title: Djatrees: Trees of the Dja Faunal Reserve Resource link: https://sites.google.com/site/tlpcouvreur/home/ressources Number of data sets: 1 Data set name: Djatrees Data format: excel sheet Description: List of all individuals (including sp.) per transect collected in the nine transects. Column label Column description Species_name Name of the identified species Family_name Plant family for the species follwing APG III Transect_number Transect number Diameter Diameter at breast hight (in cm) Author contributions BS collected the data; BS & TC analyzed and curated the data; BS & TC wrote the paper. The authors wish to thank Vincent Droissart, Gretchen Walters and Lyubomir Penev for comments and improvements to an earlier draft. References • • • • • APGIII (2003) An update of the Angiosperm Phylogeny Group classification for the orders and families of flowering plants: APG II. Botanical Journal of the Linnean Society 141 (4): 399‑436. DOI: 10.1046/j.1095-8339.2003.t01-1-00158.x Baker T, Phillips O, Malhi Y, Almeida S, Arroyo L, Fiore AD, Erwin T, Killeen T, Laurance S, Laurance W, Lewis S, Lloyd J, Monteagudo A, Neill D, Patino S, Pitman NA, Silva JNM, Martinez RV (2004) Variation in wood density determines spatial patterns in Amazonian forest biomass. Global Change Biology 10 (5): 545‑562. DOI: 10.1111/j.1365-2486.2004.00751.x Cable S, Cheek M (1998) The plants of Mt Cameroon: a conservation checklist. Royal Botanic Gardens, Kew, 198 pp. Campbell D, Hammond H (1989) Floristic inventory of tropical countries: the status of plant systematics, collections, and vegetation, plus recommendation for the future. New York Botanical Garden, New York, 545 pp. Cheek M (2009) Mussaenda epiphytica sp. nov. (Rubiaceae), an epiphytic shrub from cloud forest of the Bakossi Mts, western Cameroon. Nordic Journal of Botany 27 (6): 456‑459. DOI: 10.1111/j.1756-1051.2009.00576.x 28 • • • • • • • • • • • • • Sonké B, Couvreur T Cheek M, Pollard B, Gardens T (2004) The plants of Kupe, Mwanenguba and the Bakossi mountains, Cameroon. Royal Botanic Gardens, Kew, 508 pp. Droissart V, Hardy O, Sonké B, Dahdouh-Guebas F, Stévart T (2012) Subsampling Herbarium Collections to Assess Geographic Diversity Gradients: A Case Study with Endemic Orchidaceae and Rubiaceae in Cameroon. Biotropica 44 (1): 44‑52. DOI: 10.1111/j.1744-7429.2011.00777.x Droissart V, Sonké B, Nguembou KC, Djuikouo KM, Parmentier I, Stévart T (2009) Synopsis of the Genus Chamaeangis (Orchidaceae), Including Two New Taxa. Systematic Botany 34 (2): 285‑296. DOI: 10.1600/036364409788606361 Dupain J, Guislain P, Nguenang GM, Vleeschouwer KD, Elsacker LV (2004) High chimpanzee and gorilla densities in a non-protected area on the northern periphery of the Dja Faunal Reserve, Cameroon. Oryx 38 (2): 209‑216. DOI: 10.1017/ S0030605304000365 Hardy OJ, Sonké B (2004) Spatial pattern analysis of tree species distribution in a tropical rain forest of Cameroon: assessing the role of limited dispersal and niche differentiation. Forest Ecology and Management 197 (1): 191‑202. DOI: 10.1016/ j.foreco.2004.05.014 Kenfack D, Thomas D, Chuyong G, Condit R (2007) Rarity and abundance in a diverse African forest. Biodiversity and Conservation 16 (7): 2045‑2074. DOI: 10.1007/s10531-006-9065-2 Lachenaud O, Séné O (2012) Un nouveau Psychotria (Rubiaceae) rhéophyte du sud Cameroun. Plant Ecology and Evolution 145 (3): 423‑427. DOI: 10.5091/ plecevo.2012.714 Lachenaud O, Droissart V, Dessein S, Stévart T, Simo M, Lemaire B, Taedoumg H, Sonké B (2013) New records for the flora of Cameroon, including a new species of Psychotria (Rubiaceae) and range extensions for some rare species. Plant Ecology and Evolution 146 (1): 121‑133. DOI: 10.5091/plecevo.2013.632 Letouzey R (1968) Etude phytogéographique du Cameroun. [Phytogeopgraphic study of Cameroun]. P. Lechevalier, Paris, France, 511 pp. [In French]. Letouzey R (1985) Notice de la carte phytogéographique du Cameroun au 1: 500'000. Institut de la Carte Internationale de la Végétation, Toulouse, 240 pp. Onana J (2011) The Vascular Plants of Cameroon: A Taxonomic Checklist with IUCN Assessments. Ministry of Scientific Research and Innovation, Yaoundé, Cameroun, 194 pp. Parmentier I, Malhi Y, Senterre B, Whittaker R, Alonso A, Balinga MB, Bakayoko A, Bongers F, Chatelain C, Comiskey J, Cortay R, Kamdem MD, Doucet J, Gautier L, Hawthorne W, Issembé Y, Kouamé F, Kouka L, Leal M, Lejoly J, Lewis S, Nusbaumer L, Parren ME, Peh K-H, Phillips O, Sheil D, Sonké B, Sosef MM, Sunderland TH, Stropp J, Steege HT, Swaine M, Tchouto MGP, Gemerden Bv, Valkenburg JCHv, Wöll H (2007) The odd man out? Might climate explain the lower tree ?-diversity of African rain forests relative to Amazonian rain forests? Journal of Ecology 95 (5): 1058‑1071. DOI: 10.1111/j.1365-2745.2007.01273.x Sonké B (1998) Etudes floristiques et structurales des forêts de la Réserve du Dja (Cameroun). [Floristic and structural studies in the forests of the the Dja Reserve (Cameroon)]. Université Libre de Bruxelles, Bruxelles, 267 pp. Tree diversity of the Dja Faunal Reserve, southeastern Cameroon • • • • • • 29 Sonké B (2004) Forêts de la Réserve du Dja (Cameroun): Etudes floristiques et structurales. 32. Scripta botanica Belgica, Meise, 144 pp. Sonké B, Simo M, Dessein S (2009) Synopsis of the genus Mitriostigma (Rubiaceae) with a new monocaulous species from south Cameroon. Nordic Journal of Botany 27 (4): 305‑312. DOI: 10.1111/j.1756-1051.2009.00415.x Tchouto MGP, Boer WF, Wilde JJFE, Maesen LJG (2006) Diversity patterns in the flora of the Campo-Ma’an rain forest, Cameroon: do tree species tell it all? Forest Diversity and Management 2: 293‑314. DOI: 10.1007/978-1-4020-5208-8_16 Valencia R, Balslev H, Paz-Y-Miño-C G (1994) High tree alpha-diversity in Amazonian Ecuador. Biodiversity and Conservation 3 (1): 21‑28. DOI: 10.1007/ BF00115330 Valkenburg Jv, Ketner P, & Wilks C (1998) A floristic inventory and preliminary vegetation classification of the mixed semi-evergreen rain forest in the Minkébé region, North East Gabon. Adansonia 20: 139‑162. White F (1979) The Guineo-Congolian region and its relationships to other phytochoria. Bulletin du Jardin botanique national de Belgique 49: 11‑55. Supplementary materials Suppl. material 1: List of all individuals collected in all 9 transects of the Dja Faunal Resreve. Authors: Sonké & Couvreur Data type: List of individuals collected in each transcet in the Dja Faunal Reserve Brief description: This is the raw dataset with indication of each individual collected as well as its diameter. This dataset is also availible at https://sites.google.com/site/tlpcouvreur/home/ ressources. Filename: raw_data_Dja.xls - Download file (924.00 kb) Suppl. material 2: Vegetation distribution across the transects in the Dja Faunal Reserve Cameroon Authors: Sonké & Couvreur Data type: excel sheet Filename: Vegetation types dja.xls - Download file (61.50 kb) Suppl. material 3: Individual abundances per family Authors: Sonké & Couvreur Data type: excel sheet 30 Sonké B, Couvreur T Brief description: This sheet provides the number of individuals per family for all the species collected in the Dja Faunal Reserve. First coloum: Family; second coloum: number of individuals. this table was used to generate figure 2 of the article. Filename: family_abundance.xls - Download file (215.50 kb)