West Cameroon Quaternary lacustrine deposits: preliminary results

Maley, Jean; Livingstone, D. A.; Giresse, Pierre; Brénac, P.; Kling, George W.; Stager, Curt; Thouveny, Nicolas; Kelts, Kerry; Haag, M.; Fournier, Marc; Bandet, Y.; Williamson, David; Zogning, Appolinaire

doi:10.1016/0899-5362(91)90065-7

Cited by 8 publications

(5 citation statements)

References 33 publications

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“…2002; Jetz & Rahbek 2002). The ecoregion comprising the mountains of Cameroon is one such refugium in which the environment has probably been stable over thousands, if not millions, of years (Maley et al. 1991; Fjeldså & Lovett 1997).…”

Section: Introductionmentioning

confidence: 99%

Systematics and diversification of Praomys species (Rodentia: Muridae) endemic to the Cameroon Volcanic Line (West Central Africa)

Missoup¹,

Nicolas²,

Wendelen³

et al. 2012

Zoologica Scripta

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Missoup, A.D., Nicolas, V., Wendelen, W., Keming, E., Bilong Bilong, C.F., Couloux, A., Atanga, E., Hutterer, R. & Denys, C. (2012). Systematics and diversification of Praomys species (Rodentia: Muridae) endemic to the Cameroon Volcanic Line (West Central Africa). —Zoologica Scripta, 41, 327–345. Our integrative approach combines two mitochondrial genes (16S and cyt b gene), two nuclear genes (exon 10 GHR and exon 1 IRBP) and craniometrical data to test the status and to infer phylogenetic relationships of the three Praomys Cameroon Volcanic Line endemics (P. hartwigi, P. morio and P. obscurus). The taxonomic rank of the principal genus group is assessed and the mode of diversification of species of the P. tullbergi complex in Afrotropical forests is discussed based on estimates of times to the most recent common ancestors and on tree topologies. This study documents for the first time the molecular and morphometrical distinctiveness of P. hartwigi and P. morio within the P. tullbergi species complex. Further studies including specimens of P. hartwigi from all its distribution range are needed to conclude on the status of P. obscurus. The monophyly of the genus Praomys is refuted. Times to the most recent common ancestors of major clades within the P. tullbergi species complex are estimated for the last 2.5 Mya and during the last 1 or 2 Mya for different species or forms. The lowland forest refuge hypothesis might well explain the diversification of P. misonnei, P. rostratus and P. tullbergi in the guineo‐congolese forest block. The isolation of montane forests could have facilitated the divergence between the two montane forest forms P. hartwigi and P. obscurus and between populations of P. morio from the continent and those from the island of Bioko. Praomys populations (species) that inhabit the Cameroon Volcanic Line Praomys probably originated as lowland forms subsequently specialized to highland conditions.

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Section: Introductionmentioning

confidence: 99%

Systematics and diversification of Praomys species (Rodentia: Muridae) endemic to the Cameroon Volcanic Line (West Central Africa)

Missoup¹,

Nicolas²,

Wendelen³

et al. 2012

Zoologica Scripta

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“…The ecoregion comprising the mountains of Cameroon, especially Mount Manengouba and other nearby mountains (Kupe, Nlonako, Bakossi, Rumphi), is one such refugium in which the environment has probably been stable over thousands, if not millions, of years (e.g. Fjeldså & Lovett, 1997; Maley et al ., 1991). The Cameroonian mountain ecoregion is one of the most important in Africa in terms of both species richness and endemism and is also one of the most threatened ecoregions on the continent (Burgess et al ., 2004).…”

Section: Introductionmentioning

confidence: 99%

A new species of Cardioglossa (Amphibia: Anura: Arthroleptidae) endemic to Mount Manengouba in the Republic of Cameroon, with an analysis of morphological diversity in the genus

Blackburn

2008

Zoological Journal of the Linnean Society

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A new frog species of the genus Cardioglossa, that is probably restricted to less than 10 km 2 of gallery forest near the summit of Mount Manengouba in the Republic of Cameroon, is described. Unlike all other Cardioglossa, in life the coloration of the new species is typically brownish red, with no dorsal markings, but with a pair of thin, golden white lines that extend posteriorly from the tip of the rostrum and terminate just above and behind the tympanum. This new species is morphologically similar to C. oreas, another high-altitude species endemic to the Cameroonian mountains: both have small tympana and lack the hypertrophied third manual digit typical of males of other Cardioglossa. The tadpole of the new species is similar to that of C. occidentalis, the only other Cardioglossa for which the tadpole is fully described, but differs in having a broad anterolaterally projecting supraoral labium, lacking ventral pigmentation, and having a relatively longer spiracular tube. Several features of tadpole morphology are convergent with the unusual fossorial tadpole of the microhylid Otophryne and suggest a similar convergence in ecology. Principal components analysis of morphometric data, followed by discriminant function analysis, was used to explore patterns of morphological similarity within Cardioglossa. These analyses provide support for five species groups: (1) C. aureoli (distinct from other Cardioglossa);(2) C. escalerae, C. gratiosa and C. nigromaculata; (3) C. gracilis, C. melanogaster and C. schioetzi; (4) C. sp. nov. and C. oreas; and (5) C. cyaneospila, C. pulchra, C. venusta and C. trifasciata. The inclusion of C. cyaneospila in the last group supports previous suggestions of past biotic connections between the Albertine Rift mountains and those of the Cameroon Volcanic Line. The description of this new species further emphasizes Mt Manengouba as a centre of anuran endemism within the Cameroonian mountains and reaffirms the importance of this ecoregion within sub-Saharan Africa.

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“…To further check the reliability of the 0.08 ± 0.07 Ma age of CTBL10-3, we compared it to the age of the 23 m-thick sediments cored in the BMM crater [18]. According to [18], the middle of those sediments was ~0.021 Ma B.P. The latter age might suggest a sedimentation rate of about 0.4 mm/year.…”

Section: Resultsmentioning

confidence: 99%

“…Thus, the high content in non-radiogenic argon for the CTBL10-3 that might be due to its vesiculated aspect (Figure 2(B)), can explain the large error obtained on its age. To further check the reliability of the 0.08 ± 0.07 Ma age of CTBL10-3, we compared it to the age of the 23 m-thick sediments cored in the BMM crater [18]. According to [18], the middle of those sediments was ~0.021 Ma B.P.…”

Section: Resultsmentioning

confidence: 99%

Temporal Evolution of the Barombi Mbo Maar, a Polygenetic Maar-Diatreme Volcano of the Cameroon Volcanic Line

Tchamabé¹,

Ohba²,

Ooki³

et al. 2014

IJG

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The Barombi Mbo Maar (BMM), which is the largest maar in Cameroon, possesses about 126 mthick well-preserved pyroclastic deposits sequence in which two successive paleosoil beds have been identified. The maar was thought to have been active a million years ago. However, layers stratigraphically separated by the identified paleosoils have been dated to shed lights on its age and to reconstruct the chronology of its past activity. The results showed that the BMM formed through three eruptive cycles: the first ~0.51 Ma ago, the second at ~0.2 Ma and the third ~0.08 Ma B.P. The ages indicate that the BMM maar-forming eruptions were younger than a million years. The findings also suggested that the maar is polygenetic. At a regional scale, the eruptive events would have occurred during some volcanic manifestations at Mt Manengouba and Mt Cameroon. Therefore, with the decrease in the recurrence time of eruptions from ~0.3 Ma to 0.1 Ma, and given the possible relation between its eruptive events and those of its neighboring polygenetic volcanoes, the BMM is expected to erupt within the next 20 ka.

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West Cameroon Quaternary lacustrine deposits: preliminary results

Cited by 8 publications

References 33 publications

Systematics and diversification of Praomys species (Rodentia: Muridae) endemic to the Cameroon Volcanic Line (West Central Africa)

Systematics and diversification of Praomys species (Rodentia: Muridae) endemic to the Cameroon Volcanic Line (West Central Africa)

A new species of Cardioglossa (Amphibia: Anura: Arthroleptidae) endemic to Mount Manengouba in the Republic of Cameroon, with an analysis of morphological diversity in the genus

Temporal Evolution of the Barombi Mbo Maar, a Polygenetic Maar-Diatreme Volcano of the Cameroon Volcanic Line

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