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41 results for “African Lakes”
Dataset for: African manatee (Trichechus senegalensis) habitat suitability at Lake Ossa, Cameroon using trophic state models and predictions of submerged aquatic vegetation
<p>See research article here: https://onlinelibrary.wiley.com/doi/epdf/10.1002/ece3.8202</p> <p>Aim: The present study aims at investigating the past and current trophic status of Lake Ossa and evaluating its potential impact on African manatee health.</p> <p>Location: Lake Ossa is known as a refuge for the threatened African manatees in Cameroon. Little information exists on the water quality and health of the ecosystem as reflected by its chemical and biological characteristics.</p> <p>Methods: Aquatic biotic and abiotic parameters including water clarity, nitrogen, phosphorous and chlorophyll concentrations were measured monthly during four months at each of 18 water sampling stations evenly distributed across the lake. These parameters were then compared with historical values obtained from the literature to examine the dynamic trophic state of Lake Ossa.</p> <p>Results: Results indicate that Lake Ossa’s trophic state parameters doubled in only three decades (from 1985 to 2016), moving from a mesotrophic to a eutrophic state. The decreasing nutrient gradient moving from the mouth of the lake (in the south) to the north indicates that the flow of the adjacent Sanaga River is the primary source of nutrient input. Further analysis suggests that the poor transparency of the lake is not associated with chlorophyll concentrations but rather with the suspended sediments brought-in by the Sanaga River. Consequently, our model demonstrated that despite nutrient enrichment, less than 5% of the lake bottom surface sustained submerged aquatic vegetation. Thus, shoreline emergent vegetation is the primary food available for the local manatee population. During the dry season, water recedes drastically and disconnects from the dominant shoreline emergent vegetation, decreasing accessibility for manatees.</p> <p>Main conclusions: The current study revealed major environmental concerns (eutrophication and sedimentation) that may negatively impact habitat quality for manatees. Efficient land use and water management across the entire watershed may be necessary to mitigate such issues.</p>
Fig. 8 in Revision of the African cichlid fish genus <em><em>Ctenochromis</em></em> (Teleostei, Cichliformes), including a description of the new genus <em>Shuja</em> from Lake Tanganyika and the new species <em><em>Ctenochromis</em></em> <em>scatebra</em> from northern Tanzania
Fig. 8. Morphology of Ctenochromis Pfeffer, 1893, imaged using x-ray tomography micro CT. a. Ctenochomis pectoralis Pfeffer, 1893, paralectotype BMNH 1899.2.27.1 from Korogwe. b. C. pectoralis from the Ruvu River (part of BMNH 2021.7.15.1-3). c. C. scatebra Genner, Ngatunga &
Fig. 7 in Revision of the African cichlid fish genus <em><em>Ctenochromis</em></em> (Teleostei, Cichliformes), including a description of the new genus <em>Shuja</em> from Lake Tanganyika and the new species <em><em>Ctenochromis</em></em> <em>scatebra</em> from northern Tanzania
Fig. 7. Morphology of Ctenochromis Pfeffer, 1893.a, d, g. Oral teeth.b, e, h. Chest squamation illustrating scale-free patches. c, f, i. Cheek squamation illustrating the reduction in scale number towards the ventral section of the cheek. a–c. Ctenochomis pectoralis Pfeffer, 1893 from Korogwe (paralectotype BMNH 1899.2.27.1); d–f. C. pectoralis from the Ruvu River (part of BMNH 2021.7.15.1-3); g–i. C. scatebra Genner, Ngatunga & Turner sp. nov. from Chemka Springs (holotype BMNH 2021.7.15.4). Scale bars:
Fig. 6. a. Ctenochomis pectoralis Pfeffer, 1893, lectotype ZMH402 in Revision of the African cichlid fish genus <em><em>Ctenochromis</em></em> (Teleostei, Cichliformes), including a description of the new genus <em>Shuja</em> from Lake Tanganyika and the new species <em><em>Ctenochromis</em></em> <em>scatebra</em> from northern Tanzania
Fig. 6. a. Ctenochomis pectoralis Pfeffer, 1893, lectotype ZMH402 from Korogwe (imaged by Thilo Weddehage). b. C. pectoralis, paralectotype BMNH 1899.2.27.1 from Korogwe. c. C. pectoralis, ♂ from Ruvu River shortly after capture (part of BMNH 2021.7.15.1-3). d. C. pectoralis, ♂ from Ruvu River preserved state (part of BMNH 2021.7.15.1-3). e. C. scatebra Genner, Ngatunga & Turner sp. nov., ♂ from Chemka Springs shortly after capture (part of BMNH 2021.7.15.1-3). f. C. scatebra
Fig. 4 in Revision of the African cichlid fish genus <em><em>Ctenochromis</em></em> (Teleostei, Cichliformes), including a description of the new genus <em>Shuja</em> from Lake Tanganyika and the new species <em><em>Ctenochromis</em></em> <em>scatebra</em> from northern Tanzania
Fig. 4. Phylogenetic reconstructions of representatives of populations of Ctenochromis Pfeffer, 1893, as well as representatives of the Lake Malawi haplochromine radiation, and the Lake Tanganyika Tropheini Poll, 1986. a. Maximum Likelihood phylogenetic reconstruction based on 11 288 SNPs. b. Maximum Likelihood phylogenetic reconstruction based on 1047 basepairs of the entired NADH2 mtDNA gene. In both trees, numbers on branches indicate percentage bootstrap support, and branches with> 70% support are shown. The scale bars represent a measure of genetic distance. See Table 1 for sampling details. Collection localities are in parentheses. Samples from Nyumba ya Mungu have accessions
Fig. 5. Shuja horei gen. et comb. nov. a in Revision of the African cichlid fish genus <em><em>Ctenochromis</em></em> (Teleostei, Cichliformes), including a description of the new genus <em>Shuja</em> from Lake Tanganyika and the new species <em><em>Ctenochromis</em></em> <em>scatebra</em> from northern Tanzania
Fig. 5. Shuja horei gen. et comb. nov. a. Illustration from the original type specimen (Günther 1894). b. A freshly caught specimen collected in 2016 from the Malagarasi River, Ilagala (BMNH 2021.7.15.14). c. Radiographs of the type series (syntypes) from the Natural History Museum (BMNH 1889.1.30.13– 15). Note the prognathous jaw that distinguishes Shuja Genner, Ngatunga & Turner gen. nov. from other genera within the Tropheini Poll, 1986. Radiographs from the Natural History Museum, London
Fig. 3. Principal Component Axes 1 and 2 in Revision of the African cichlid fish genus <em><em>Ctenochromis</em></em> (Teleostei, Cichliformes), including a description of the new genus <em>Shuja</em> from Lake Tanganyika and the new species <em><em>Ctenochromis</em></em> <em>scatebra</em> from northern Tanzania
Fig. 3. Principal Component Axes 1 and 2 of morphological measurements of specimens of Ctenochromis pectoralis Pfeffer, 1893 of the type series from Korogwe, compared with specimens of C. pectoralis from the Ruvu River, and C. scatebra Genner, Ngatunga & Turner sp. nov. from Chemka Springs. The image of C. pectoralis from Korogwe is from the original description (Pfeffer 1893). Collection localities are in parentheses following the species names. In total, Principal Component Axes 1 and 2
Fig. 1 in Revision of the African cichlid fish genus <em><em>Ctenochromis</em></em> (Teleostei, Cichliformes), including a description of the new genus <em>Shuja</em> from Lake Tanganyika and the new species <em><em>Ctenochromis</em></em> <em>scatebra</em> from northern Tanzania
Fig. 1. The type locality of Ctenochromis pectoralis Pfeffer, 1893 is Korogwe, in the lower section of the Pangani River system. Collection sites of specimens of Ctenochromis for this study were Chemka Springs and the Ruvu River (which flows between Lake Jipe to the east, and Nyumba ya Mungu Reservoir to the west). A further population of Ctenochromis has been reported from Mzima Springs, in
Fig. 6. a. Ctenochomis pectoralis Pfeffer, 1893, lectotype ZMH402 in Revision of the African cichlid fish genus Ctenochromis (Teleostei, Cichliformes), including a description of the new genus Shuja from Lake Tanganyika and the new species Ctenochromis scatebra from northern Tanzania
Fig. 6. a. Ctenochomis pectoralis Pfeffer, 1893, lectotype ZMH402 from Korogwe (imaged by Thilo Weddehage). b. C. pectoralis, paralectotype BMNH 1899.2.27.1 from Korogwe. c. C. pectoralis, ♂ from Ruvu River shortly after capture (part of BMNH 2021.7.15.1-3). d. C. pectoralis, ♂ from Ruvu River preserved state (part of BMNH 2021.7.15.1-3). e. C. scatebra Genner, Ngatunga & Turner sp. nov., ♂ from Chemka Springs shortly after capture (part of BMNH 2021.7.15.1-3). f. C. scatebra sp. nov. holotype BMNH 2021.7.15.4. Scale bars: 10 mm.
Fig. 4 in Revision of the African cichlid fish genus Ctenochromis (Teleostei, Cichliformes), including a description of the new genus Shuja from Lake Tanganyika and the new species Ctenochromis scatebra from northern Tanzania
Fig. 4. Phylogenetic reconstructions of representatives of populations of Ctenochromis Pfeffer, 1893, as well as representatives of the Lake Malawi haplochromine radiation, and the Lake Tanganyika Tropheini Poll, 1986. a. Maximum Likelihood phylogenetic reconstruction based on 11 288 SNPs. b. Maximum Likelihood phylogenetic reconstruction based on 1047 basepairs of the entired NADH2 mtDNA gene. In both trees, numbers on branches indicate percentage bootstrap support, and branches with> 70% support are shown. The scale bars represent a measure of genetic distance. See Table 1 for sampling details. Collection localities are in parentheses. Samples from Nyumba ya Mungu have accessions EU753938 and EU753939 and are from Koblmüller et al. (2008).
Fig. 1 in Revision of the African cichlid fish genus Ctenochromis (Teleostei, Cichliformes), including a description of the new genus Shuja from Lake Tanganyika and the new species Ctenochromis scatebra from northern Tanzania
Fig. 1. The type locality of Ctenochromis pectoralis Pfeffer, 1893 is Korogwe, in the lower section of the Pangani River system. Collection sites of specimens of Ctenochromis for this study were Chemka Springs and the Ruvu River (which flows between Lake Jipe to the east, and Nyumba ya Mungu Reservoir to the west). A further population of Ctenochromis has been reported from Mzima Springs, in the Tsavo River system of Kenya.
Fig. 5. Shuja horei gen. et comb. nov. a in Revision of the African cichlid fish genus Ctenochromis (Teleostei, Cichliformes), including a description of the new genus Shuja from Lake Tanganyika and the new species Ctenochromis scatebra from northern Tanzania
Fig. 5. Shuja horei gen. et comb. nov. a. Illustration from the original type specimen (Günther 1894). b. A freshly caught specimen collected in 2016 from the Malagarasi River, Ilagala (BMNH 2021.7.15.14). c. Radiographs of the type series (syntypes) from the Natural History Museum (BMNH 1889.1.30.13– 15). Note the prognathous jaw that distinguishes Shuja Genner, Ngatunga & Turner gen. nov. from other genera within the Tropheini Poll, 1986. Radiographs from the Natural History Museum, London (Creative Commons Attribution License (CC BY 4.0)). Scale bars: 10 mm.
Fig. 7 in Revision of the African cichlid fish genus Ctenochromis (Teleostei, Cichliformes), including a description of the new genus Shuja from Lake Tanganyika and the new species Ctenochromis scatebra from northern Tanzania
Fig. 7. Morphology of Ctenochromis Pfeffer, 1893.a, d, g. Oral teeth.b, e, h. Chest squamation illustrating scale-free patches. c, f, i. Cheek squamation illustrating the reduction in scale number towards the ventral section of the cheek. a–c. Ctenochomis pectoralis Pfeffer, 1893 from Korogwe (paralectotype BMNH 1899.2.27.1); d–f. C. pectoralis from the Ruvu River (part of BMNH 2021.7.15.1-3); g–i. C. scatebra Genner, Ngatunga & Turner sp. nov. from Chemka Springs (holotype BMNH 2021.7.15.4). Scale bars: 1 mm.
Fig. 2. a in Revision of the African cichlid fish genus Ctenochromis (Teleostei, Cichliformes), including a description of the new genus Shuja from Lake Tanganyika and the new species Ctenochromis scatebra from northern Tanzania
Fig. 2. a. Ruvu River where specimens of Ctenochromis pectoralis Pfeffer, 1893 were collected. b. Chemka Springs where specimens of C. scatebra Genner, Ngatunga & Turner sp. nov. were collected. See Table 1 for collection details.
Fig. 8 in Revision of the African cichlid fish genus Ctenochromis (Teleostei, Cichliformes), including a description of the new genus Shuja from Lake Tanganyika and the new species Ctenochromis scatebra from northern Tanzania
Fig. 8. Morphology of Ctenochromis Pfeffer, 1893, imaged using x-ray tomography micro CT. a. Ctenochomis pectoralis Pfeffer, 1893, paralectotype BMNH 1899.2.27.1 from Korogwe. b. C. pectoralis from the Ruvu River (part of BMNH 2021.7.15.1-3). c. C. scatebra Genner, Ngatunga & Turner sp. nov., holotype BMNH 2021.7.15.4. Scale bars: 10 mm.
Fig. 3. Principal Component Axes 1 and 2 in Revision of the African cichlid fish genus Ctenochromis (Teleostei, Cichliformes), including a description of the new genus Shuja from Lake Tanganyika and the new species Ctenochromis scatebra from northern Tanzania
Fig. 3. Principal Component Axes 1 and 2 of morphological measurements of specimens of Ctenochromis pectoralis Pfeffer, 1893 of the type series from Korogwe, compared with specimens of C. pectoralis from the Ruvu River, and C. scatebra Genner, Ngatunga & Turner sp. nov. from Chemka Springs. The image of C. pectoralis from Korogwe is from the original description (Pfeffer 1893). Collection localities are in parentheses following the species names. In total, Principal Component Axes 1 and 2 captured 74.5% of the observed morphological variation.
Figure 1 in First record of the occurrence of the Chinese pond mussel Sinanodonta woodiana (Lea, 1834) (Bivalvia: Unionidae) in African freshwaters: Oubeira Lake, Algeria
Figure 1. Location of Oubeira Lake in the boundaries of El-Kala National Park (modified from Sarri, 2017).
Figure 3 in First record of the occurrence of the Chinese pond mussel Sinanodonta woodiana (Lea, 1834) (Bivalvia: Unionidae) in African freshwaters: Oubeira Lake, Algeria
Figure 3. Scheme of measurements for S. woodiana from Oubeira Lake (photos by Bensaâd-Bendjedid L.): shell's length (SL), height (SH), and width (SW).
Figure 4 in Phylogeny and biogeography of African Biomphalaria (Gastropoda: Planorbidae), with emphasis on endemic species of the great East African lakes
Figure 4. Biogeographical hypothesis of the evolutionary history of the African Biomphalaria species. A, Pliocene– Pleistocene dispersal of a Biomphalaria glabrata-like snail into western Africa where the ancestral African Biomphalaria evolved, probably similar to Biomphalaria camerunensis/Biomphalaria pfeifferi. B. pfeifferi colonized most of the sub- Saharan continent. The ancestral African Biomphalaria or a B. camerunensis/B. pfeifferi-like stock migrated to East Africa and evolved into a Biomphalaria angulosa-like species, which is ancestral to the choanomphala-group snails. Within this species group the Ugandan Biomphalaria sudanica and Biomphalaria alexandrina evolved with B. alexandrina subsequently migrating along the River Nile to eastern North Africa. The river Nile and the surrounding region is indicated in the small inset.
Figure 3 in Phylogeny and biogeography of African Biomphalaria (Gastropoda: Planorbidae), with emphasis on endemic species of the great East African lakes
Figure 3. Consensus cladogram resulting from the parsimony and maximum-likelihood analyses of the combined matrix (16S, cytochrome oxidase subunit I, COI, and internal transcribed spacer I, ITS1). maximum-parsimony (MP) bootstrap values greater than 50% are positioned below the nodes, and the posterior probabilities from the Bayesian inference analysis are placed above the nodes. Species icons represent the typical morphology of the species. Species without country nomination are from Uganda. The 'Nilotic species complex' first inferred by DeJong et al. (2001) is indicated by the vertical bar. Note the basal position of Biomphalaria angulosa to the Nilotic species complex. The weak bootstrap support of this complex in the parsimony analysis is a result of the close phylogenetic relationship with B. angulosa.
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