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202 results for “Lake Tanganyika”
Data from: Genetic evidence for prevalence of alloparental care in a socially monogamous biparental cichlid fish, Perissodus microlepis, from Lake Tanganyika supports the "selfish shepherd effect" hypothesis
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Data from: Functional coupling constrains craniofacial diversification in Lake Tanganyika cichlids
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Data from: Evolutionary associations between host traits and parasite load: insights from Lake Tanganyika cichlids
Parasite diversity and abundance (parasite load) vary greatly among host species. However, the influence of host traits on variation in parasitism remains poorly understood. Comparative studies of parasite load have largely examined measures of parasite species richness and are predominantly based on records obtained from published data. Consequently, little is known about the relationships between host traits and other aspects of parasite load, such as parasite abundance, prevalence and aggregation. Meanwhile, understanding of parasite species richness may be clouded by limitations associated with data collation from multiple independent sources. We conducted a field study of Lake Tanganyika cichlid fishes and their helminth parasites. Using a Bayesian phylogenetic comparative framework, we tested evolutionary associations between five key host traits (body size, gut length, diet breadth, habitat complexity and number of sympatric hosts) predicted to influence parasitism, together with multiple measures of parasite load. We find that the number of host species that a particular host may encounter due to its habitat preferences emerges as a factor of general importance for parasite diversity, abundance and prevalence, but not parasite aggregation. In contrast, body size and gut size are positively related to aspects of parasite load within, but not between species. The influence of host phylogeny varies considerably among measures of parasite load, with the greatest influence exerted on parasite diversity. These results reveal that both host morphology and biotic interactions are key determinants of host–parasite associations and that consideration of multiple aspects of parasite load is required to fully understand patterns in parasitism.
FIGURE 1 in Two new cichild species Neolamprologus (Teleostei: Cichlidae) from Lake Tanganyika, East Africa
FIGURE 1. Type localities of all species in the Neolamprologus savoryi complex at Lake Tanganyika.
Distribution. Itombwe Mountains in DR Congo, W of Lake Tanganyika. in Bovidae
Distribution. Itombwe Mountains in DR Congo, W of Lake Tanganyika.
Fig. 2. 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. 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.
Figures 9–14 in Monogeneans from Catfishes in Lake Tanganyika. I: Two new species of Bagrobdella (Dactylogyridae) from Auchenoglanis occidentalis (Siluriformes: Claroteidae)
Figures 9–14. Haptors of the six species belonging to Bagrobdella: (9) Bagrobdella vanhovei sp. nov.; (10) Bagrobdella vansteenbergei sp. nov.; (11) Bagrobdella auchenoglanii; (12) Bagrobdella fraudulenta; (13) Bagrobdella anthopenis; (14) Bagrobdella parauchenoglanii (Akoumba et al 2017, Euzet and Le Brun 1990). Scale bars: 20 µm.
Figures 2–7 in Monogeneans from Catfishes in Lake Tanganyika. I: Two new species of Bagrobdella (Dactylogyridae) from Auchenoglanis occidentalis (Siluriformes: Claroteidae)
Figures 2–7. Measurement scheme of the sclerotized structures of Bagrobdella spp.: (2) anchor, a: total length; b: blade length; c: shaft length; d: guard length; e: point length. (3) Dorsal bar, x: horizontal length; y: vertical length; w: width. (4) Ventral bar, x: horizontal length; cx: length of median projection; cy: width of median projection; BL: length of outgrowth; Bl: width of outgrowth. (5) Trapezoidal piece, L: length; l: width. (6) Male copulatory complex, Pe: length of penis, AL: length of bulb; Al: width of bulb. (7) Length of hook.
Linked collectors and determiners for: 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.
Natural history specimen data linked to collectors and determiners held within, "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". Claims or attributions were made on Bionomia by volunteer Scribes, <a href="https://bionomia.net/dataset/02a5d778-d054-4731-b306-6906c0f9a425">https://bionomia.net/dataset/02a5d778-d054-4731-b306-6906c0f9a425</a> using specimen data from the dataset aggregated by the Global Biodiversity Information Facility, <a href="https://gbif.org/dataset/02a5d778-d054-4731-b306-6906c0f9a425">https://gbif.org/dataset/02a5d778-d054-4731-b306-6906c0f9a425</a>. Formatted as a Frictionless Data package.
Figure 3 in An extraordinary shift in life habit within a genus of cyclopid copepods in Lake Tanganyika
Figure 3. Eucyclops bathanalicola sp. nov. paratype female. A, mandible; B, maxillule; C, maxilla; D, left leg 1, intercoxal sclerite and base of endopod of right leg, anterior view showing lack of inner spine on right basis; E, left leg 2 and intercoxal sclerite, anterior. All scale bars: 50 µm.
Figure 2 in An extraordinary shift in life habit within a genus of cyclopid copepods in Lake Tanganyika
Figure 2. Eucyclops bathanalicola sp. nov. paratype female. A, habitus, dorsal; B, fifth leg in situ on left side of fifth pedigerous somite, ventral; C, right genital aperture, sixth leg and right side of fifth pedigerous somite, dorsal; D, genital double-somite, ventral showing copulatory pore and extent of seminal receptacle (dotted lines); E, right caudal ramus, dorsal; F, antennule. Scale bars: A, 0.5 mm, B–C, 50 µm, D–F, 100 µm.
Data from: Mouth dimorphism in scale-eating cichlid fish from Lake Tanganyika advances individual fitness
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Data from: Evolutionary associations between host traits and parasite load: insights from Lake Tanganyika cichlids
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Data from: Community assembly in Lake Tanganyika cichlid fish: quantifying the contributions of both niche-based and neutral processes
The cichlid family features some of the most spectacular examples of adaptive radiation. Evolutionary studies have highlighted the importance of both trophic adaptation and sexual selection in cichlid speciation. However, it is poorly understood what processes drive the composition and diversity of local cichlid species assemblages on relatively short, ecological timescales. Here, we investigate the relative importance of niche-based and neutral processes in determining the composition and diversity of cichlid communities inhabiting various environmental conditions in the littoral zone of Lake Tanganyika, Zambia. We collected data on cichlid abundance, morphometrics, and local environments. We analyzed relationships between mean trait values, community composition, and environmental variation, and used a recently developed modeling technique (STEPCAM) to estimate the contributions of niche-based and neutral processes to community assembly. Contrary to our expectations, our results show that stochastic processes, and not niche-based processes, were responsible for the majority of cichlid community assembly. We also found that the relative importance of niche-based and neutral processes was constant across environments. However, we found significant relationships between environmental variation, community trait means, and community composition. These relationships were caused by niche-based processes, as they disappeared in simulated, purely neutrally assembled communities. Importantly, these results can potentially reconcile seemingly contrasting findings in the literature about the importance of either niche-based or neutral-based processes in community assembly, as we show that significant trait relationships can already be found in nearly (but not completely) neutrally assembled communities; that is, even a small deviation from neutrality can have major effects on community patterns.
Figure 28 in Monogeneans from Catfishes in Lake Tanganyika. I: Two new species of Bagrobdella (Dactylogyridae) from Auchenoglanis occidentalis (Siluriformes: Claroteidae)
Figure 28. PCA-Biplot of species belonging to Bagrobdella.
Figure 27 in Monogeneans from Catfishes in Lake Tanganyika. I: Two new species of Bagrobdella (Dactylogyridae) from Auchenoglanis occidentalis (Siluriformes: Claroteidae)
Figure 27. Bagrobdella vansteenbergei sp. nov., haptoral structure and MCO. Scale bar: 20 µm.
Figure 1 in Monogeneans from Catfishes in Lake Tanganyika. I: Two new species of Bagrobdella (Dactylogyridae) from Auchenoglanis occidentalis (Siluriformes: Claroteidae)
Figure 1. Sampling sites localities.
Figure 3 in Redescription of Mastacembelus ophidium Günther, 1893 (Synbranchiformes: Mastacembelidae) and description of a new spiny eel from Lake Tanganyika
Figure 3. Scatterplots of SL against (A) dorsal spine number and ( B) total vertebrae number . (
Data from: Community assembly in Lake Tanganyika cichlid fish: quantifying the contributions of both niche-based and neutral processes
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FIGURES 148–157 in The genus Afrocymbella (Bacillariophyceae) from lakes Malawi and Tanganyika, with description of new fossil and extant species
FIGURES 148–157. Afrocymbella brunii and Afrocymbella beccarii, LM valve views. 148–151. Afrocymbella brunii, observed in samples from Isanga, Monkey, Mangochi, and Chembe Bays. 152–157. Afrocymbella beccarii, observed in samples from Chituta and Isanga Bays. Scale bar = 10 μm.
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International Brain Laboratory public data
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OpenNeuro
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