Surrounded by Great Lakes: Assessing the ichthyological diversity of Northern Zambian drainage systems

Schedel, Frederic D.B.; Huyghe, Charlotte E.T.; Boileau, Nicolas; Indermaur, Adrian; Ronco, Fabrizia; Fritschi, Laura M.; Phiri, Mabvuto; Makasa, Lawrence; Katongo, Cyprian; Salzburger, Walter

doi:10.1016/j.jglr.2023.102245

Journal of Great Lakes Research

2024

DOI: 10.1016/j.jglr.2023.102245

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Surrounded by Great Lakes: Assessing the ichthyological diversity of Northern Zambian drainage systems

Frederic D.B. Schedel,

Charlotte E.T. Huyghe,

Nicolas Boileau

et al.

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2024

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Cited by 3 publications

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Environmental DNA Metabarcoding Details the Spatial Structure of a Diverse Tropical Fish Assemblage in a Major East African River System

Shechonge,

Collins,

Ward

et al. 2024

Environmental DNA

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Management and conservation of species‐rich tropical freshwater systems require reliable information on the diversity and distribution of species present. Here, we used environmental DNA metabarcoding to reveal the diversity of the fishes in the Rufiji River catchment of central Tanzania. Across 174 samples from 49 sites, and using a newly developed reference library, we mapped the presence of 66 fish species from an estimated 91 that we are confident are present in the system. We found clear evidence of community structuring of the assemblage linked to key environmental gradients—elevation, temperature, and turbidity. We also identified core distributions of rare or threatened taxa, including migratory species such as the anguillid eels. With a focused analysis of 50 samples collected over a small spatial scale (<2 km) from the Kilombero River, we showed that each single sample can capture an average of 23.1 species, while three samples can capture 39.4 species, from a total of 56 species encountered in the 50 samples. Collectively the results help to identify species vulnerable to ongoing change in the catchment, including dam construction and agricultural intensification. The results clearly demonstrate how eDNA‐based metabarcoding can reliably describe the diversity and distributions of riverine fish species across a catchment, providing standardized information that will be valuable for environmental management.

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Environmental DNA Metabarcoding Details the Spatial Structure of a Diverse Tropical Fish Assemblage in a Major East African River System

Shechonge,

Collins,

Ward

et al. 2024

Environmental DNA

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Species in Ancient Lakes 9: An introduction to the conference and special section

Cohen,

Salzburger

2024

Journal of Great Lakes Research

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Morphometric synthesis of Pollimyrus (Teleostei, Mormyridae) with the description of four new species

Dierickx,

Wamuini Lunkayilakio,

Bills

et al. 2024

Journal of Fish Biology

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Mormyridae, a species‐rich family endemic to Africa, remains taxonomically understudied. This has been the case for the genus Pollimyrus Taverne, 1971, which hinders further understanding of the distribution, ecology, and conservation of its species. Therefore, an in‐depth morphometric comparison of all currently valid species is carried out using most of the available type specimens. Species delineations were re‐evaluated, and four species new to science described: Pollimyrus ibalazambai sp. nov. (the Luki River, the Democratic Republic of the Congo), Pollimyrus krameri sp. nov. (the Lugenda River, Mozambique), Pollimyrus vanneeri sp. nov. (the Kouilou‐Niari River, the Republic of the Congo), and Pollimyrus weyli sp. nov. (the Buzi River, Mozambique). In this study, Pollimyrus guttatus is confirmed to belong to Pollimyrus, whereas Pollimyrus eburneensis and Cyphomyrus plagiostoma seem more similar to species allocated to other genera. No or only little morphological differences were found between the type series of several species, which could indicate the need for synonymization of these species (Pollimyrus cuandoensis with Pollimyrus marianne and Pollimyrus nigripinnis with Pollimyrus pulverulentus). As such 20 species are currently morphologically identifiable in the genus Pollimyrus. The present study highlights the critical need for further synthetic efforts and new collecting efforts across Africa for this and other Mormyridae genera.

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Surrounded by Great Lakes: Assessing the ichthyological diversity of Northern Zambian drainage systems

Cited by 3 publications

References 93 publications

Environmental DNA Metabarcoding Details the Spatial Structure of a Diverse Tropical Fish Assemblage in a Major East African River System

Environmental DNA Metabarcoding Details the Spatial Structure of a Diverse Tropical Fish Assemblage in a Major East African River System

Species in Ancient Lakes 9: An introduction to the conference and special section

Morphometric synthesis of Pollimyrus (Teleostei, Mormyridae) with the description of four new species

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