7 Works

Life history shifts in an exploited African fish following invasion by a castrating parasite

Nestory Peter Gabagambi, Arne Skorping, Mwita Chacha, Kwendwa Jonathan Kihedu & Adele Mennerat
Evolutionary theory predicts that infection by a parasite that reduces future host survival or fecundity should select for increased investment in current reproduction. In this study we use the cestode Ligula intestinalis and its intermediate fish host Engraulicypris sardella in Wissman Bay, Lake Nyasa (Tanzania) as a model system. Using data about infection of E. sardella fish hosts by L. intestinalis collected for a period of 10 years, we explored whether parasite infection affects the...

Whole genome resequencing data enables a targeted SNP panel for conservation and aquaculture of Oreochromis cichlid fishes

Adam Ciezarek, Antonia Ford, Graham Etherington, Nasser Kasozi, Milan Malinsky, Tarang Mehta, Luca Penso-Dolfin, Benjamin Ngatunga, Asilatu Shechonge, Rashid Tamatamah, Wilfried Haerty, Federica Di Palma, Martin Genner & Turner George
Cichlid fish of the genus Oreochromis form the basis of the global tilapia aquaculture and fisheries industries. Broodstocks for aquaculture are often collected from wild populations, which in Africa may be from locations containing multiple Oreochromis species. However, many species are difficult to distinguish morphologically, hampering efforts to maintain good quality farmed strains. Additionally, non-native farmed tilapia populations are known to be widely distributed across Africa and to hybridize with native Oreochromis species, which themselves...

Data from: Genomic islands of speciation separate cichlid ecomorphs in an East African crater lake

Milan Malinsky, Richard J. Challis, Alexandra M. Tyers, Stephan Schiffels, Yohey Terai, Benjamin P. Ngatunga, Eric A. Miska, Richard Durbin, Martin J. Genner & George F. Turner
The genomic causes and effects of divergent ecological selection during speciation are still poorly understood. Here we report the discovery and detailed characterization of early-stage adaptive divergence of two cichlid fish ecomorphs in a small (700 meters in diameter) isolated crater lake in Tanzania. The ecomorphs differ in depth preference, male breeding color, body shape, diet, and trophic morphology. With whole-genome sequences of 146 fish, we identified 98 clearly demarcated genomic “islands” of high differentiation...

Newly discovered cichlid fish biodiversity threatened by hybridization with non-native species - Data supporting published version

Martin Genner, Tabitha Blackwell, Antonia Ford, Adam Ciezarek, Stephanie Bradbeer, Carlos Gracida-Juarez, Alan Smith, Benjamin Ngatunga, Asilatu Shechonge, Rashid Tamatamah, Graham Etherington, Wilfried Haerty, Federica Di Palma & George Turner
Invasive freshwater fish systems are known to readily hybridize with indigenous congeneric species, driving loss of unique and irreplaceable genetic resources. Here we reveal that newly discovered (2013-2016) evolutionarily significant populations of Korogwe tilapia (Oreochromis korogwe) from southern Tanzania are threatened by hybridization with the larger invasive Nile tilapia (Oreochromis niloticus). We use a combination of morphology, microsatellite allele frequencies and whole genome sequences to show that O. korogwe from southern lakes (Nambawala, Rutamba and...

Data from: Fast adaptive responses in the oral jaw of Lake Victoria cichlids

Jacco C. Van Rijssel, Ellen S. Hoogwater, Mary A. Kishe-Machumu, Elize Van Reenen, Kevin V. Spits, Ronald C. Van Der Stelt, Jan H. Wanink & Frans Witte
Rapid morphological changes in response to fluctuating natural environments are a common phenomenon in species that undergo adaptive radiation. The dramatic ecological changes in Lake Victoria provide a unique opportunity to study environmental effects on cichlid morphology. This study shows how four haplochromine cichlids adapted their premaxilla to a changed diet over the past 30 years. Directly after the diet change toward larger and faster prey in the late 1980s, the premaxilla (upper jaw) changed...

Data from: Terrestrial-focused protected areas are effective for conservation of freshwater fish diversity in Lake Tanganyika

Adam W. Britton, Julia J. Day, Christopher J. Doble, Benjamin P. Ngatunga, Kirsty M. Kemp, Chris Carbone, David J. Murrell, B.P. Ngatunga, J.J. Day, D.J. Murrell, C.J. Doble & A.W. Britton
Freshwater protected areas are rarely designed specifically for this purpose and consequently their conservation benefit cannot be guaranteed. Using Lake Tanganyika as a test case we investigated the benefits of terrestrial-focussed protected areas on the alpha and beta taxonomic and functional diversity of the diverse endemic rocky-shore cichlid fishes. Lake Tanganyika has limited protected shorelines and continued human population growth in its catchment, which has potential for negative impacts on habitat quality and key biological...

Data from: The onset of ecological diversification 50 years after colonization of a crater lake by haplochromine cichlid fishes

Florian N. Moser, Jacco C. Rijssel, Salome Mwaiko, Joana I. Meier, Benjamin Ngatunga, Ole Seehausen & Jacco C. Van Rijssel
Adaptive radiation research typically relies on the study of evolution in retrospective, leaving the predictive value of the concept hard to evaluate. Several radiations, including the cichlid fish in the East African Great Lakes, have been studied extensively, yet no study has investigated the onset of the intraspecific processes of niche expansion and differentiation shortly after colonization of an adaptive zone by cichlids. Haplochromine cichlids of one of the two lineages that seeded the Lake...

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Affiliations

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