Geographic variation and taxonomy of Rousettus aegyptiacus (Mammalia: Megachiroptera) in the islands of the Gulf of Guinea

Juste, Javier

doi:10.1006/zjls.1993.1008

Cited by 3 publications

(5 citation statements)

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“…(2000) supported the protection of Bioko Island and Mt Cameroon, as well as the mid‐highlands and Bamenda‐Banso Highlands, to maximize preservation of intraspecific avian diversity. Results from the present study demonstrate that species of Phrynobatrachus found on Bioko Island reflect that of lowland habitats on the mainland, supporting hypotheses that Bioko Island has recently been connected to the continental mainland by a broad landbridge (Thys van den Andenauerde, 1967; Juste & Ibañez, 1993) and endemism of amphibian fauna on this island is quite low. If conservation of unique taxa with smaller ranges is a priority, then the mid‐highlands, including Mt Manengouba, the Bamenda‐Banso Highlands, and specifically Mt Oku, should be the focus of conservation efforts.…”

Section: Discussionsupporting

confidence: 80%

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Biogeographical analysis of Cameroonian puddle frogs and description of a new species ofPhrynobatrachus(Anura: Phrynobatrachidae) endemic to Mount Oku, Cameroon

Zimkus¹

2009

Zoological Journal of the Linnean Society

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Patterns of species divergence amongst 13 species of Phrynobatrachus from Cameroon were analysed using phylogenetic analyses of mitochondrial DNA sequence data from 12S rRNA, valine-tRNA, and 16S rRNA. A clade endemic to the mountains of western Cameroon and eastern Nigeria, part of the geologic rift zone termed the Cameroon Volcanic Line, supports the view that montane regions have acted as centres of speciation. Bioko Island (Equatorial Guinea), located 32 km off the coast of Cameroon, is populated by three different lowland Phrynobatrachus species from the mainland. Two of these species, Phrynobatrachus auritus and Phrynobatrachus cornutus reach submontane elevations on Bioko Island (up to 1200-1300 m) but are present only at lowland elevations on mainland Cameroon. A new miniature species of puddle frog of the genus Phrynobatrachus restricted to Mt Oku in the Republic of Cameroon is diagnosed on the basis of morphological characters and molecular data. Unlike all other miniature Phrynobatrachus (snout-vent length < 20 mm), males of this species have unique ventral coloration characterized by a black throat, dark brown to black pectoral and abdominal regions, and a light or white area on the proximal hind limbs. Minute spines cover the venter in males, often appearing as white asperities. The description of this new species supports the significance of this montane ecoregion as a biodiversity hotspot for anurans.

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Section: Discussionsupporting

confidence: 80%

“…2B). Mainland populations of P. cornutus from the Southwest Region were more closely related to island populations than mainland populations found in the East Region, supporting hypotheses that Bioko Island has been connected to the continental mainland in the recent past (Thys van den Andenauerde, 1967; Juste & Ibañez, 1993).…”

Section: Resultssupporting

confidence: 65%

Biogeographical analysis of Cameroonian puddle frogs and description of a new species ofPhrynobatrachus(Anura: Phrynobatrachidae) endemic to Mount Oku, Cameroon

Zimkus¹

2009

Zoological Journal of the Linnean Society

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“…Within the genus Rousettus , four of the ten clades with recent species statuses are island endemics, including R. bidens and R. linduensis from Sulawesi, R. obliviosus from Comoros and R. madagascariensis from Madagascar (Simmons ). Two lineages from islands in the Gulf of Guinea, R. a. princeps and R. a. tomensis have been granted subspecific statuses (Juste & Ibáñez ; Juste et al . ).…”

Section: Discussionmentioning

confidence: 99%

“…The ecological characteristics of rousettes resulted to a unique distribution pattern among fruit bats, including both Asia and Africa, and also allowed R. aegyptiacus and R. leschenaulti to spread to relatively high latitudes, characterized by comparatively dry, cold and seasonal climates, which represent conditions close to the limits of the abiotic selective gradient of the group. Recently, R. aegyptiacus has an extensive disjunct range and is considered polytypic (Bergmans ) with four continental subspecies: R. a. egyptiacus (Geoffroy, 1810) distributed in Cyprus, Turkey, the Levant and Egypt; R. a. arabicus Anderson, 1902 in the Arabian Peninsula, Iran and Pakistan; R. a. leachi (Smith, 1829) in East Africa; and R. a. unicolor (Gray, 1870) in West Africa and two endemic insular subspecies from the Gulf of Guinea, including R. a. princeps Juste & Ibáñez, from Principe island and R. a. tomensis Juste & Ibáñez, from São Tomé Island.…”

Section: Introductionmentioning

confidence: 99%

Environmental margin and island evolution in Middle Eastern populations of the Egyptian fruit bat

et al. 2012

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Here, we present a study of the population genetic architecture and microevolution of the Egyptian fruit bat (Rousettus aegyptiacus) at the environmental margins in the Middle East using mitochondrial sequences and nuclear microsatellites. In contrast to the rather homogenous population structure typical of cave-dwelling bats in climax tropical ecosystems, a relatively pronounced isolation by distance and population diversification was observed. The evolution of this pattern could be ascribed to the complicated demographic history at higher latitudes related to the range margin fragmentation and complex geomorphology of the studied area. Lineages from East Africa and Arabia show divergent positions. Within the northwestern unit, the most marked pattern of the microsatellite data set is connected with insularity, as demonstrated by the separate status of populations from Saharan oases and Cyprus. These demes also exhibit a reduction in genetic variability, which is presumably connected with founder effects, drift and other potential factors related to island evolution as site-specific selection. Genetic clustering indicates a semipermeability of the desert barriers in the Sahara and Arabian Peninsula and a corridor role of the Nile Valley. The results emphasize the role of the island environment in restricting the gene flow in megabats, which is also corroborated by biogeographic patterns within the family, and suggests the possibility of nascent island speciation on Cyprus. Demographic analyses suggest that the colonization of the region was connected to the spread of agricultural plants; therefore, the peripatric processes described above might be because of or strengthened by anthropogenic changes in the environment.

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“…Bioko (2007 km 2 ) is a volcanic island that emerged during the Pleistocene (Eisentraut 1963) associated with a rift that stretches across the Gulf of Guinea (Fuster 1955). This island has been connected to the continent several times in the recent past (Juste & Ibanez 1993, Thys van den Andenauerde 1967 and, consequently, exhibits a noticeable continental character. The landscape is young with deep valleys and steep slopes reaching upwards to 3011 m on the Basile peak (IGNE 1983).…”

mentioning

confidence: 99%

Altitudinal variation in the subcanopy fruit bat guild in Bioko Island, Equatorial Guinea, Central Africa

Val¹

1995

J. Trop. Ecol.

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Geographic variation and taxonomy of Rousettus aegyptiacus (Mammalia: Megachiroptera) in the islands of the Gulf of Guinea

Cited by 3 publications

References 1 publication

Biogeographical analysis of Cameroonian puddle frogs and description of a new species ofPhrynobatrachus(Anura: Phrynobatrachidae) endemic to Mount Oku, Cameroon

Biogeographical analysis of Cameroonian puddle frogs and description of a new species ofPhrynobatrachus(Anura: Phrynobatrachidae) endemic to Mount Oku, Cameroon

Environmental margin and island evolution in Middle Eastern populations of the Egyptian fruit bat

Altitudinal variation in the subcanopy fruit bat guild in Bioko Island, Equatorial Guinea, Central Africa

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