Freshwater swamp forests are wetland ecosystems with poorly understood ecology. With increasing degradation across the Niger basin (where it is the most extensive across West Africa), it is deemed important to understand its distribution, patterns and composition. This is aimed at both increasing botanical inventories in the ecosystem and also elucidate vital steps that could guide its effective conservation. This study assessed the floristic composition and diversity across 16 one hectare forest plots and sought to show how varied the sites were in terms of diversity, stem density and basal area. The survey showed that the area had 116 species within 82 genera and 36 families. The number of species found in each of the disturbed sites was generally higher than the intact forest sites, which was not diverse but comprised many trees with higher basal area. While the stem density which ranged from 94 - 409 stems ·ha -1 is comparable with that of other tropical forests, species richness was low (ranging from 8.65 - 0.52). Diversity ranged from 3.38 - 0.98 and was higher in disturbed sites than in intact locations. Species richness was generally low and implies that loss of species in the ecosystem could threaten species’ existence and conservation in the ecosystem. Disturbed locations had more species than the intact zones and as such show the importance of targeted conservation not only in the undisturbed locations but also in the disturbed locations with a higher species value and potential for species stability of the ecosystem.
Tropical ecosystems are the biologically richest ecosystem on earth (Pimm & Raven, 2000; Bradshaw et al., 2009; Gibson et al., 2011) and contain up to two third of the earth’s terrestrial biodiversity (Gardner et al., 2009) . They are very productive ecosystem that provides significant benefits, a wide range of ecosystem services and sources of livelihood for a vast majority (Lewis, 2006; FAO, 2011) . While these features make tropical ecosystems unique and sought after, they are being lost at alarming rates, without a detailed understanding of their specific ecosystems. Studies on tropical ecosystems abound and have been able to give a general background on what exists in the tropics; however in depth studies concerning specific ecosystems (especially freshwater swamp forests) and its biodiversity patterns are lacking.
Even though the freshwater swamp forests are unique ecosystems which provide valuable ecosystem services such as the regulation of flood and maintenance of water quality by removing sediment and pollutants from moving water (Asthana & Asthana, 2003) , provision of timber and wood products, habitat for wildlife and recreation for bird-watching and fishing, their ecological relationships are poorly understood. Freshwater swamp forests are wetland ecosystems associated with low-lying areas along the lower reaches of rivers and around freshwater lakes. Being periodically inundated by river water, their soils are high in nutrients, often water logged and the trees grow rapidly, particularly where flooding results in physical disturbance of the forest (Thomas & Baltzer, 2002) . The ecosystem borders other forest ecosystems like lowland rainforest and mangrove swamp forests (James, 2008) ; given their restricted environmental range, they are prone to fragmentation and disturbance.
The Nigerian freshwater swamp forest is concentrated in the Niger delta where over 20 million people, including 40 ethnic groups, live (Spalding et al., 2010) , and cover some 12,000 km2 or half of the delta (NDES, 1997) . The main canopy of the forest is rather open and has almost impenetrable undergrowth (Keay, 1959) . The ecosystem’s initial inaccessibility prevented human incursions and subsequent depletion; however, with the myriad of activities ongoing in the Niger basin: crude oil exploration, infrastructural development, expansion of agriculture, timber harvesting, urbanization, population increase, dredging activities, land reclamation and flooding (Igu, 2017a) , they are becoming degraded and threatened. Logging activities in the region have intensified since the development of roads and waterways opened up the region and made it accessible from market locations (Igu, 2016) . Being the oil hub of the country (Ite et al., 2013) , the region’s population have grown over the years, and its associated impacts (like intensive agriculture to meet the growing population, urbanization, land reclamation and infrastructural development) have all culminated and contributed to an extensive and on-going depletion and degradation of the ecosystem.
Combined with this increasingly degraded state, most of the studies on the freshwater swamp forest ecosystem have been from the Neotropics, especially Brazil (Kurtz et al., 2013; Scarano et al., 1997) , hence, forestalling the need to understand the freshwater swamp forest in other parts of the tropics. The lack of information about the ecosystem is more pronounced in Africa and Nigeria as a whole, with little or no information and understanding about the ecosystem since the initial rapid assessment on the composition and control of the ecosystem by Keay (1959) . Documenting the biodiversity of this ecosystem through forest surveys and taxonomic inventories have become more necessary than ever, particularly in the Niger Delta (along the Niger basin) region of Nigeria where the ecosystem is the most extensive across Africa (Ogon, 2006) and covers up to half of the delta (NDES, 1997) . This study is aimed at improving the baseline for the freshwater swamp forest across the region. To achieve this, the objectives are to: 1) document the existing composition of the ecosystem and show their varied abundance at the species and family levels, 2) show the variations in species richness, diversity and density of the ecosystem, 3) determine the variations that exist in the biodiversity indices within and across the sites and 4) compare the findings with other studies conducted elsewhere and show its priorities for conservation management. Part of the data on undisturbed freshwater swamp forest (for Otuwe forest) have been previously reported in Igu (2017b) , but was used as it provided a basis for comparison with other results from the disturbed sites.
The study was conducted in the Niger basin, being a part of the Niger delta that is a vast low lying sedimentary basin crisscrossed by a large number of meandering streams, rivers and creeks that drain the river Niger into the Atlantic Ocean at the Bight of Biafra (
The sites were delimited after the vegetation map of Keay (1959) . Selection of the sites was done to capture variations in disturbance among the sites using the
presence of cut stems (stumps) and the sizes of stems. With the above guideline, three sites or locations that captured the issues were selected across the region (
Following Phillips et al. (2003) , a standard plot-based method with a series of 1 ha square plots were established between December 2013 and April 2014. The plots were established along transects that were 1 km wide apart. This helped to ensure that there were variations in the floristic composition and consistency in enumeration of the plots. Each 100 m × 100 m (1 ha−1) plot was further divided into blocks of 20 × 20 m each in order to manage the enumeration. The stem sizes (diameter) of the trees were measured with a girth tape at their diameter breast height (DBH = 130 cm) or above the buttresses, where present. In each of the plots, only stems ≥ 10 cm were measured and identified, with the assistance of trained taxonomists from the Forestry Research Institute Ibadan (FRIN). Plant species were identified to species levels in the field, while voucher specimen were collected for unidentified ones and verified in FRIN herbarium afterwards. Plant identification followed the Taxonomy of Nigerian plants (Keay, 1989) . The Akarai-Obodo and Akili-Ogidi site each contained 4 plots, while 8 plots were set up at Otuwe. The variation in the number of plots per forest site was due to differences in the sizes of forest units.
Importance values (IV) were used to characterize the forest sites and summarize the patterns and composition of the ecosystem across different forest locations. In addition to the frequency, density, basal area and dominance, relative values were used to ascertain the importance values for the species as well as that of the different families. The importance values were calculated after Cottam and Curtis (1956) , Husch et al. (2003) and Mori et al. (1983) as follows:
Relative Density = 100 × Number of stems of a species Total number of stems (1)
Relative frequency = 100 × Frequency of a species Sum of all species (2)
Relative dominance = 100 × Total basal area of a species Total basal area of all species (3)
Basal Area ( B A ) = ( d b h 2 ) 2 × π (4)
Species importance values ( S I V ) = Relative density + Relative frequency + Relative dominance (5)
Relative diversity = 100 × Number of species in afamily Total number of species (6)
Family importance values ( F I V ) = Relative density + Relative dominance + Relative diversity (7)
The importance values range from 0 to 300 indicating absence of dominance and monodominance respectively; dominant species or families were defined as those with values ≥ 10 (Adomou et al., 2009) .
The biodiversity indices of the ecosystem were calculated following Magurran (1998) , Magurran (2004) and Kent and Coker (1992) :
Shannon-Wiener index: (8)
H ′ = − ∑ i = 1 S p i ln p i
where Hl is the Shannon-Weiner index, s is the total number of species, pi is the proportion of individuals in the ith species, and ln is the natural logarithm.
Pielou’s evenness index: (9)
E = ∑ i = 1 S p i ln p i ln (S)
Margalef’s species richness index: (10)
M = ( S − 1 ) ln N
The survey recorded a total of 116 species within 82 genera and 36 families across the 16 plots. As these hectares were from three different forest locations or sites, the results are thus presented according to the different forest sites below.
Akarai-Obodo (Site 1)
This location recorded the highest number of plant species (80) compared to all other sites. While many species are found here, they are composed of three abundant species: Elaeis guineensis, Cleistopholis patens Engl. & Diels and Sterculia oblonga with Importance values of 52, 29.4 and 28 respectively (Appendix 1). Malvaceae with the highest family importance value of 43.41 dominated the remaining 32 families that constitute the forest site. Other abundant families within the site includes: Rubiaceae, Arecacea and Leguminosae, in decreasing order (Appendix 2).
Akili-Ogidi (Site 2)
This forest location is made up of 58 plant species and 23 families. The species in the location are however dominated by Elaeis guineensis, Hexalobus crispiflorus A. Rich and Spondias mombin Jacq with 126.65, 13.91 and 10.74 species importance values respectively (Appendix 1). While most species’ occurrence in the forest was less than 1%, Elaeis guineensis had a 42.2% occurrence in the forest. The Arecaceae family had the highest family importance value of 111.7 in the forest, while other abundant families include: Malvaceae, Leguminosae and Annonaceae, in decreasing order (Appendix 2).
Otuwe (Site 3)
This forest location had the lowest number (35) of species and family (18) occurrence among other forest locations. Diospyros mespiliformis, Sterculia oblonga, Sterculia rhinopetala K. Schum and Celtis zenkeri Engl, with importance values of 83.61, 66.29, 35.51 and 26.32, respectively, were the dominant species in the site (Appendix 1). Malvaceae had the highest family importance value of 106.93, while the remaining three abundant families were Ebenaceae, Leguminosae and Cannabaceae with importance values of 72.36, 40.51 and 20.75, respectively (Appendix 2).
The species richness varied from the highest index of 8.65 in (Akarai-Obodo) to the least value of 0.52 in (Otuwe) (
Site location | Diversity | Richness index | Evenness |
---|---|---|---|
Akarai-Obodo (1) | 4.03 | 6.55 | 0.83 |
Akarai-Obodo (1) | 4.04 | 6.36 | 0.86 |
Akarai-Obodo (1) | 4.38 | 8.65 | 0.88 |
Akarai-Obodo (1) | 3.56 | 5.4 | 0.78 |
Akili-Ogidi (2) | 3.53 | 7.65 | 0.68 |
Akili-Ogidi (2) | 3.64 | 5.88 | 0.77 |
Akili-Ogidi (2) | 2.88 | 4.68 | 0.73 |
Akili-Ogidi (2) | 3.31 | 3.74 | 0.81 |
Otuwe (3) | 2.13 | 2.47 | 0.83 |
Otuwe (3) | 1.78 | 1.43 | 0.81 |
Otuwe (3) | 0.98 | 0.52 | 0.7 |
Otuwe (3) | 1.88 | 3.26 | 0.64 |
Otuwe (3) | 1.44 | 2.16 | 0.55 |
Otuwe (3) | 1.47 | 1.34 | 0.71 |
Otuwe (3) | 1.85 | 1.91 | 0.75 |
Otuwe (3) | 1.76 | 1.71 | 0.77 |
diversity across the sites. The highest Shannon diversity index of 3.38 was recorded in the first forest site (Akarai-Obodo), while the last site (Otuwe) had the least value of 0.98. Leguminosae and Malvaceae families had the highest number of species across the forest sites while others varied across the sites (
The number of tree stems varied across the plots and locations. The number of trees per plot ≥ 10 DBH ranged from a least value of 94 to the highest value of 409. The pattern of stem density across the sites showed mean values of 193, 138 and 255 tree stands∙ha−1 (dbh ≥ 10 cm) in site 1, 2 and 3 (
The species composition across the sites and plots differed in their patterns of dominance. The dominance of Malvaceae across the ecosystem was mainly from the genus Sterculia, which occurred in all the forest locations. The genus has distributional range in tropical areas of Africa and Asia and particularly in the West African countries of Nigeria, Benin, Cote d’Ivoire, Ghana, Guinea, Guinea-Bissau, Liberia, Mali, Togo and Sierra-Leone (Burkill, 1985; Keay, 1989;
Family | Number of species per forest site | ||
---|---|---|---|
Site 1 | Site 2 | Site 3 | |
Annonaceae | 4 | 5 | - |
Apocynaceae | 6 | 4 | - |
Leguminosae | 11 | 6 | 9 |
Malvaceae | 7 | 10 | 5 |
Meliaceae | 4 | 5 | - |
Moraceae | 6 | 5 | - |
Rubiaceae | 7 | - | - |
Forest location | Number of plots (ha) | Average basal area (m2 per ha) | Average diversity per ha | Average stem density per ha |
---|---|---|---|---|
Akarai-obodo | 4 | 204,861.5 ± 51,382.02 | 4.00 ± 0.34 | 193.75 ± 74.79 |
Akili-ogidi | 4 | 179,904.7 ± 39,781.25 | 3.34 ± 0.34 | 138 ± 43.61 |
Otuwe | 8 | 421,830.5 ± 164,251.2 | 2.66 ± 0.35 | 255.13 ± 88.16 |
Nussinovitch, 2010) ; and not restricted to the freshwater swamp forest ecosystem only. Though the dominance of Elaeis guineensis has been reported in other swamp forests (Keay, 1959; Ubom et al., 2012) , it is however a reflection of the extent of the degradation, mainly from anthropogenic factors ongoing in the ecosystem. Being a secondary forest species which requires an open canopy to thrive, it dominates the freshwater swamp ecosystems that have undergone series of anthropogenic and natural disturbances. As such, it is a main flora of the first two sites which are more degraded than the third site where it only had a single stem/tree occurrence out of 2041 stems ≥ 10 DBH.
The Leguminosae family being another notable dominant family in the ecosystem recorded the highest number of species among all the families in the ecosystem. Being a major feature of the tropical (or Neotropical) rainforest ecosystem (Gentry, 1995, 1988; Duran et al., 2006; Romero-Duque et al., 2007; Fonty et al., 2011) , it maintains its dominance through its multiple species presence. As such, the constraint associated with the ecosystem which limits the number of plant presence does not affect it in the same proportion with the other families with poorer species diversity. The genus Rhizophora was also found in plots associated with creeks and rivulets where disturbances have opened up spaces for them to thrive and where the degree of salinity (associated with the creeks) permits or is suitable for them to coexist with other freshwater swamp flora. It was not found in site 2 which even though was similar in terms of wetness but does not have the tiny creeks and inlets like other locations that permits the transportation of both their seeds and saline water for the facilitation of their propagation and coexistence.
The freshwater swamp ecosystem is a floristically variable forest whose dominance is varied across different geographical scales. As such, the main feature that is found to dominate one location is not consistently the same across a landscape or region. In the Indo Malayan region for example, dominant species like: Melaleuca leucadendron, Ficus sp., Erythrina sp., Memecylon sp. have been reported (Wikramanayake et al., 2002) ; in the neotropics, dominant species like Tabebuia cassinoides, Tovomitopsis paniculata, Symphonia globulifera, Pterocarpus officinalis and families like: Clusiaceae, Bignoniaceae, Burseraceae, Arecaceae and Annonaceae were reported (Scarano et al., 1997; van Andel, 2003; Fickert & Grüninger, 2010; Teixeira et al., 2011) . This pattern is unlike other ecosystem like the lowland forests in the tropical and neotropical regions which are dominated by the Leguminosae family (Gentry, 1995, 1988; Duran et al., 2006) and the lowland (rainforest) forests of southwestern Nigeria which is dominated by Moraceae family (Adekunle et al., 2013) . The freshwater swamp forests in the Niger basin are made up of floristic composition which occurs in other ecosystems, however its pattern of dominance and coexistence are varied and site specific.
Species diversity varied from site to site and from forest to forest, with some forest or sites being composed of large trees and diverse composition, while others have less (
The results of the patterns of stem abundance/density across the sites (
Species richness of the ecosystem though varied, were generally low. This low species richness feature is however consistent with other freshwater swamp forests (Lugo et al., 1988; Scarano et al., 1997; Teixeira et al., 2011; Kurtz et al., 2013) due to environmental constraints associated with the ecosystem. The flooding regime that is associated with the ecosystem which inundates the soil exerts selective pressure on the composition and the structure of the ecosystem (Kurtz et al., 2013) . Since the flood free environments required to facilitate reproduction and shallow water to prevent water-logging of seedlings or gas exchange (Lugo et al., 1998) are barely guaranteed for the ecosystem, it affects its richness and composition such that only those species with higher tendencies of adaptation could thrive in the ecosystem. Similar studies (Kurtz et al., 2013) reported lower species richness of the forests compared to the drier adjacent soil or forest locations.
As the ecosystem continues to undergo regimes of natural and anthropogenic disturbances, they provide gaps in the canopies of the forests and provide basis for regeneration and species diversity across the landscape. Such events go on to create opportunities for the addition of new species to the ecosystem and in turn facilitate the reinforcement and maintenance of the tree diversity in the ecosystem (Nakagawa et al., 2013) .
The study documented an array of composition found across the ecosystem according to their respective abundance in the ecosystem. Their stem densities were similar with those of other tropical forest ecosystems, while their diversity increased with disturbance across the ecosystem. The ecosystem is characterized by general low species richness, as in other freshwater swamp forests in the Neotropics. This implies that the loss of any single species in the ecosystem poses a great threat to species’ existence and conservation, and in turn, puts the ecosystem at the risk of ecosystem collapse. Furthermore, as the species diversity and rarity of the ecosystem are more associated with disturbed locations more than the intact zones, effective conservation of the ecosystem should be focused not only on the intact forest locations with higher basal area per hectare, but also on the disturbed locations whose higher species’ value is vital for the stability of the ecosystem.
The authors declare no conflicts of interest regarding the publication of this paper.
Igu, N. I., & Marchant, R. (2018). Floristic Composition and Diversity of Freshwater Swamp Forests in the Niger Basin of Nigeria. Open Journal of Forestry, 8, 567-584. https://doi.org/10.4236/ojf.2018.84035
Species | Akarai-Obodo | Akili-Ogidi | Otuwe |
---|---|---|---|
Abarema floribunda | |||
Albizia ferruginea | 1.688261 | ||
Albizia spp | 1.182647 | ||
Alstonia boonei | 5.273127 | 1.134639 | |
Amphimas pterocarpoides | 1.666846 | ||
Aningeria robusta | |||
Anogeissus leiocarpus | |||
Anonidium mannii | 2.154593 | ||
Anthocleista djalonensis | 2.213826 | 1.262639 | 1.182452 |
Antiaris africana | 1.982069 | ||
Barteria fistulosa | |||
Bombax buonopozense | 2.031561 | ||
Bosqueia angolensis | 4.167887 | 1.182457 | |
Brachystegia eurycoma | 2.246022 | 3.904973 | |
Brachystegia leonensis | 1.576329 | ||
Brachystegia nigerica | 1.862433 | 5.379226 | |
Canthium hispidum | 2.000241 | 2.151111 | |
Ceiba pentandra | 5.940044 | 6.490513 | |
Celtis zenkeri | 1.923731 | 26.32844 | |
Chrysophyllum albidum | 1.898732 | 1.075445 | |
Chrysophyllum perpulchrum | 1.078215 | ||
Chytranthus spp | |||
Cleistopholis patens | 29.45342 | 4.660224 | 4.124914 |
Coelocaryon preussii | |||
Cola acuminata | 1.075155 | ||
Cola gigantea | 2.488194 | 2.347414 | |
Cola glabra | 1.839652 | ||
Cola laurifolia | 0.825137 | 5.574301 | |
Cola millenii | 1.258239 | ||
Cordia millenii | |||
Dacryodes edulis | |||
Desplatsia dewevrei | 3.51052 | ||
Dialium guineensis | 1.090339 | 2.344116 | |
Dichapetalum madagascariense | 0.962355 | ||
Digitaria debilis | 0.962717 |
Diospyros dendo | 0.968501 | ||
---|---|---|---|
Diospyros crassiflora | 4.506656 | ||
Diospyros mespiliformis | 5.338611 | 1.074898 | 83.61359 |
Diospyros nigerica | |||
Discoglypremna caloneura | 3.609703 | ||
Dryopteris floridana | |||
Elaeis guineensis | 52.00559 | 126.6598 | 1.134632 |
Enantia chlorantha | 1.273874 | ||
Entandrophragm candollei | 1.080146 | ||
Entandrophragm utile | 2.247097 | ||
Entandrophragma angolense | 0.825435 | ||
Eribroma oblonga | 2.182032 | ||
Erythrina spp | |||
Erythrophleum ivorense | 2.06397 | 13.31255 | |
Erythrophleum spp | 1.903386 | ||
Ficus capensis | 0.825137 | 5.302325 | |
Ficus exasperata | 2.317183 | ||
Ficus mucuso | 8.633911 | 1.271621 | 3.404889 |
Funtumia elastica | 0.827792 | 5.028155 | |
Garcinia kola | 1.629011 | ||
Guarea cedrata | 1.812063 | 1.075882 | |
Hallea ciliata | 9.629677 | ||
Hallea stipulosa | 0.828533 | ||
Hexalobu crispiflorus | 13.91045 | ||
Holarrhena floribunda | 0.962355 | 1.444515 | |
Hunteria umbellata | 0.837557 | 1.134745 | |
Hylodendron gabunense | 0.962355 | 9.223245 | |
Irvingia gabonensis | 0.827444 | 6.319821 | |
Isoberlina doka | 5.364762 | ||
Khaya grandifoliola | 1.172013 | 1.134665 | |
Khaya ivornensis | 4.094591 | ||
Lagerstroemia speciosa | 5.930298 | ||
Lannea schweinfurthii | 1.082442 | ||
Lannea welwitschii | |||
Lecaniodiscus cupanioides | 1.662038 | 2.342669 | 2.317108 |
Lophira alata | 9.547587 | ||
Lophira lanceolata |
Macaranga barteri | 2.196274 | ||
---|---|---|---|
Maesopsis eminii | |||
Malacantha alnifolia | 0.970397 | 2.158558 | |
Mangifera indica | 2.771867 | ||
Manilkara obovata | |||
Margaritaria discoidea | 0.825137 | 1.278033 | |
Melaleuca leucadendra | 0.833518 | ||
Memecylon afzelii | 0.825282 | 1.076123 | |
Memecylon spp | |||
Milicia excelsa | 3.515729 | ||
Milicia regia | 1.075345 | ||
Millettia thonningii | 2.338638 | 1.134632 | |
Mitragyna inermis | 0.831446 | ||
Mitragyna stipulosa | 4.380536 | ||
Monodora myristica | 1.815984 | 1.474119 | |
Morinda lucida | 3.438922 | ||
Morus mesozyia | 0.824802 | ||
Musanga cecropioides | 1.857842 | ||
Myrianthus arboreus | 2.23528 | ||
Napoleonaea vogelii | 2.94418 | 1.278873 | |
Nauclea diderrichii | 1.078215 | ||
Nauclea stipulosa | 2.884921 | 6.566734 | |
Nesogordonia papaverifera | 1.328563 | ||
Octolobus angustatus | |||
Parinari robusta | 2.266607 | 2.221846 | |
Patabea capitellata | 1.655753 | ||
Pentaclethra macrophylla | 0.827133 | ||
Pentadesma butyracea | |||
Picralima nitida | 0.963652 | 2.539741 | |
Piptadeniastrum africanum | 2.210919 | ||
Pterocarpus santalinoides | 3.455573 | 1.258704 | 6.437034 |
Pterocarpus soyauxii | 5.331148 | ||
Pterocarpus spp | 4.237953 | ||
Pterygota macrocarpa | 1.776064 | ||
Pycnanthus angolensis | 2.866712 | 1.23056 | |
Raphia spp | |||
Raphia sudanica | 2.930847 |
Rauvolfia spp | 1.649942 | ||
---|---|---|---|
Rauvolfia vomitoria | 1.074745 | ||
Rhizophora mangle | 0.831446 | ||
Rhizophora racemosa | 7.91984 | 2.317417 | |
Rhizophora spp | |||
Ricinodendron heudelotii | 0.834263 | 1.298952 | |
Rinorea dentata | 1.647195 | ||
Rothmannia spp | |||
Spathodea campanulata | 1.794041 | 3.254281 | |
Spondias mombin | 6.178376 | 10.74476 | |
Staudtia stipitata | |||
Sterculia africana | 1.139104 | ||
Sterculia oblonga | 28.07248 | 66.29354 | |
Sterculia rhinopetala | 4.12768 | 1.077231 | 35.51309 |
Sterculia tragacantha | 2.933026 | 1.376623 | |
Strombosia grandifolia | 3.120082 | ||
Strombosia pustulata | 5.322241 | 1.633595 | 4.291599 |
Terminalia avicennioides | 2.516946 | ||
Terminalia glaucescens | 1.139711 | ||
Terminalia spp | 1.134634 | ||
Terminalia superba | 1.42714 | ||
Tetrapleura tetraptera | 1.134715 | ||
Treculia africana | 6.577993 | 8.526626 | |
Trichilia monadelpha | 6.247534 | ||
Uapaca guineensis | 1.075345 | ||
Uapaca togoensis | 0.977829 | ||
Vitex doniana | 3.387174 | ||
Xylopia aethiopica | 1.725525 | 1.074859 | 1.231034 |
Zanthoxylum zanthoxyloides | 1.074745 |
Family | Akarai-Obodo | Akili-Ogidi | Otuwe |
---|---|---|---|
Anacardiaceae | 2.326875392 | 10.7531479 | - |
Annonaceae | 21.54616439 | 24.0358095 | 6.327382 |
Apocynaceae | 13.68306688 | 10.9453741 | 5.500882 |
Arecaceae | 31.43476464 | 111.73514 | 2.750374 |
Bignoniaceae | 1.647105548 | 2.29498454 | - |
Boraginaceae | - | - | - |
Burseraceae | - | - | - |
Cannabaceae | 11.46649296 | - | 20.75239 |
Chrysobalanaceae | 2.943130047 | - | 2.750537 |
Clusiaceae | - | 2.45855428 | - |
Combretaceae | 6.697683047 | - | 2.750375 |
Dichapetalaceae | 1.513550285 | - | - |
Dryopteridaceae | - | - | - |
Ebenaceae | 3.560009764 | 1.90604619 | 72.36145 |
Euphorbiaceae | 20.90501934 | 2.12362815 | - |
Gentianaceae | 1.793739678 | 2.09279409 | 2.798137 |
Irvingiaceae | 1.381257431 | 4.38585439 | - |
Lamiaceae | - | 3.30263665 | - |
Lecythidaceae | 2.485428041 | - | 2.894153 |
Leguminosae | 28.45146696 | 24.91781 | 40.5147 |
Lythraceae | - | 6.54819949 | - |
Malvaceae | 43.41755092 | 31.5052189 | 106.9306 |
Melastomataceae | 1.380086734 | 1.90708591 | - |
Meliaceae | 8.583727185 | 16.0890486 | 2.750395 |
Moraceae | 22.47994868 | 19.8750625 | 8.491825 |
Myristicaceae | 1.582812675 | - | 5.548783 |
Myrtaceae | 1.384547581 | - | - |
Ochnaceae | 3.758184234 | - | - |
Olacaceae | 2.486928279 | 2.46244664 | 7.400022 |
Passifloraceae | - | - | - |
Phyllanthaceae | 4.846542261 | 4.0216475 | - |
Poaceae | 2.934935178 | - | - |
Rhamnaceae | - | - | - |
Rhizophoraceae | 3.985304624 | - | 2.846018 |
Rubiaceae | 34.70823489 | 6.52173711 | 3.786145 |
Rutaceae | - | 1.90591623 | - |
Sapindaceae | 4.100367167 | 2.27905925 | 2.845823 |
Sapotaceae | 3.91789855 | 5.93279789 | - |
Sterculiaceae | 1.942724369 | - | - |
Urticaceae | 5.119861064 | - | - |
Violaceae | 1.534591196 | - | - |