Bio‐indicator species and Central African rain forest refuges in the Campo‐Ma'an area, Cameroon

Tchouto, M. G. P.; Wilde, J. de; Boer, Willem F. de; Maesen, L.J.G. van der; Cleef, A.M.

doi:10.1017/s1477200008002892

Cited by 37 publications

(44 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The Southern Ngovayang is among the most species-rich sites of the range of small mountains bordering the gulf of Guinea, with a mean of 110 tree species ha -1 ( (White 1983;Davis et al, 1994;van Gemerden et al 2003;Tchouto et al 2006Tchouto et al , 2009. Furthermore, the Fisher's a value for Ngovayang is significantly higher (KruskalWallis test, P = 0.039) than that for forests of Korup National Park (mean of 30.5), widely known for its high diversity and endemism.…”

Section: Discussionmentioning

confidence: 99%

Tree diversity and conservation value of Ngovayang’s lowland forests, Cameroon

et al. 2011

View full text Add to dashboard Cite

The Ngovayang Massif of southern Cameroon is a range of small hills near the Atlantic coast, in the Lower Guinea floristic region. This region is known to harbor forests with high levels of biodiversity and endemism, but this Massif is botanically poorly known. We assessed tree species diversity, floristic composition and level of endemism of the Ngovayang forest, comparing it with other sites in Central Africa. Five 1-ha permanent plots within old-growth lowland forests of the Ngovayang Massif were censused. A total of 2,658 individuals with dbh C 10 cm were recorded, belonging to 293 species, 170 genera and 60 families. The mean number of stems was 532 ± 75 stems ha -1 . Taking into account other data available, the list of vascular plants known in the Massif reaches a total of 450 species. We found 47 species of high conservation value, including Cameroon endemics and other rare and threatened species. Species richness and endemism are comparable to those of the richest known sites in Central African forests. The forests of Electronic supplementary material The online version of this article (Ngovayang were found to be particularly rich in Fabaceae-Caesalpinioideae. Topographic heterogeneity, high precipitation and atmospheric humidity owing to the proximity of the ocean, and permanence of a forest cover during past geological times probably all contribute to explaining the Massif's high tree diversity and endemism. This study highlights the botanical importance of the poorly studied Ngovayang forest within the Lower Guinea region, justifying efforts for improved assessment of this value and for the development of suitable national conservation strategies.

show abstract

Section: Discussionmentioning

confidence: 99%

Tree diversity and conservation value of Ngovayang’s lowland forests, Cameroon

et al. 2011

View full text Add to dashboard Cite

show abstract

“…Loasibegonia and sect. Scutobegonia, Rinorea spp., Caesalpinioideae and most Rubiaceae (Achoundong 1994;Rietkerk et al 1996;Robbrecht 1996;Sosef 1996;Tchouto et al 2009). However, the distribution of Orchidaceae in West Central Africa (Stévart 2003) showed that the patterns of distribution within this family, reputed for its long distance dispersal ability, were similar to those found in organisms with low dispersal abilities.…”

Section: Introductionmentioning

confidence: 99%

Do plant families with contrasting functional traits show similar patterns of endemism? A case study with Central African Orchidaceae and Rubiaceae

et al. 2011

View full text Add to dashboard Cite

International audienceThe influence of functional traits on floristic patterns remains poorly understood in tropical rain forests. This contribution explores whether patterns of endemism of plant species are influenced by their life form and mode of dispersal. We used a comprehensive dataset of 3650 georeferenced plant specimens collected in Cameroon belonging to 115 taxa of Orchidaceae and 207 Rubiaceae endemic to Atlantic Central Africa. Species diversity of each family was compared using raw species richness (SR) and an index of species diversity (S k ) using subsampling procedure to correct for sampling bias. Measures were compared at three scales (square grids of one half-degree and one-degree per side and ecoregions) and according to elevation and continentality gradients. Species similarity between grid cells was measured using the sample-size corrected NNESS index. For both families, SR and S k decreased along the continentality gradient. In forest habitats below 1500 m altitude, both Orchidaceae and Rubiaceae show similar endemism patterns, but they differ in intensity. At higher altitudes, S k is higher for orchids due to the presence of endemic terrestrial taxa in grasslands, where the endemic Rubiaceae flora is rather poor. Substantial endemism observed at the ecoregion level and turnover analysis supported the role of the Sanaga River as a phytogeographical boundary. Similar endemism patterns were observed in lowland forests for Orchidaceae and Rubiaceae, even though Orchidaceae are assumed to have better long distance dispersal capabilities. The dispersal ability of Orchidaceae could be limited by the need of specific mycorhizal fungi for seed germination or host specificity for epiphytic orchid

show abstract

“…These cyclic climatic variations have had a major influence on plant diversity and on the evolution of vegetation cover in eastern DRC and Rwanda (Tchouto et al, 2008). In the eastern area of the Kivu-Tanganyika region, during the period between 23000 and 3000 years BP, the vegetation reflects a colder climate than the current one; (Faden, 1994;Mayr and O'hara, 1986;Maley, 1987;Roche, 1991;Roche and Ntaganda, 1999;Runge, 2007).…”

Section: Paleoenvironmental and Biogeographical Considerationsmentioning

confidence: 99%

Two New Species of Loxogramme and Lepisorus (Polypodiaceae): Endemic Ferns from Kivu-Ruwenzori Mountain System (Eastern D.R.Congo, Albertine Rift)

Mokoso¹,

Diggelen²

2017

Int. J. Curr. Res. Biosci. Plant Biol.

View full text Add to dashboard Cite

A b s t r a c t A r t i c l e I n f oThis article mentions the presence of two new species or variation discovered and described once in the Kivu-Ruwenzori mountain system in D. R. Congo. The used methodology is related to taxonomy treatment of herbarium with macroscopic and microscopic observations of spores. We have also established chronological and ecological analysis. Loxogramme ntahobavukiana to simple fronds, pinnately lobed, notched, oblanceolate the base and without sori exindusiate, elongated, oblique to costa. While Lepisorus robbrechtiana was characterized by monomorphic fronds, with a tendency to fronds monomorphic, with a tendency of dimorphism, lamina of two kinds, assimilating holders of sori, long each lobed at the vein rib fork, and others are short integers and simple vein.

show abstract

Bio‐indicator species and Central African rain forest refuges in the Campo‐Ma'an area, Cameroon

Cited by 37 publications

References 15 publications

Tree diversity and conservation value of Ngovayang’s lowland forests, Cameroon

Tree diversity and conservation value of Ngovayang’s lowland forests, Cameroon

Do plant families with contrasting functional traits show similar patterns of endemism? A case study with Central African Orchidaceae and Rubiaceae

Two New Species of Loxogramme and Lepisorus (Polypodiaceae): Endemic Ferns from Kivu-Ruwenzori Mountain System (Eastern D.R.Congo, Albertine Rift)

Contact Info

Product

Resources

About