Patterns of ectoparasite infection in wild-caught and laboratory-bred cichlid fish, and their hybrids, implicate extrins
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ADVANCES IN CICHLID RESEARCH IV
Patterns of ectoparasite infection in wild-caught and laboratory-bred cichlid fish, and their hybrids, implicate extrinsic rather than intrinsic causes of species differences in infection Tiziana P. Gobbin Martine E. Maan
. Ron Tiemersma . Giulia Leone . Ole Seehausen .
Received: 17 April 2020 / Revised: 7 September 2020 / Accepted: 22 September 2020 Ó The Author(s) 2020
Abstract Parasite-mediated selection may initiate or enhance differentiation between host populations that are exposed to different parasite infections. Variation in infection among populations may result from differences in host ecology (thereby exposure to certain parasites) and/or intrinsic immunological traits. Species of cichlid fish, even when recently diverged, often differ in parasite infection, but the contributions of intrinsic and extrinsic causes are unknown. Here, we compare infection patterns between two closely related host species from Lake Guest editors: S. Koblmu¨ller, R. C. Albertson, M. J. Genner, K. M. Sefc & T. Takahashi / Advances in Cichlid Research IV: Behavior, Ecology andEvolutionary Biology
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10750-020-04423-7) contains supplementary material, which is available to authorized users. T. P. Gobbin (&) O. Seehausen Division of Aquatic Ecology & Evolution, Institute of Ecology and Evolution, Universitat Bern, Bern, Switzerland e-mail: [email protected] O. Seehausen e-mail: [email protected]
Victoria (genus Pundamilia), using wild-caught and firstgeneration laboratory-reared fish, as well as laboratoryreared hybrids. Three of the commonest ectoparasite species observed in the wild were also present in the laboratory populations. However, the infection differences between the host species as observed in the wild were not maintained in laboratory conditions. In addition, hybrids did not differ in infection from either parental species. These findings suggest that the observed species differences in infection in the wild might be mainly driven by ecology-related effects (i.e. differential exposure), rather than by intrinsic species differences in immunological traits. Thus, while there is scope for parasite-mediated selection in Pundamilia in the wild, it has apparently not yet generated divergent evolutionary responses and may not enhance assortative mating among closely related species. M. E. Maan e-mail: [email protected] T. P. Gobbin O. Seehausen Department of Fish Ecology and Evolution, Centre of Ecology, Evolution and Biogeochemistry, Eawag, Swiss Federal Institute of Aquatic Science and Technology, Kastanienbaum, Switzerland
T. P. Gobbin R. Tiemersma G. Leone M. E. Maan Groningen Institute for Evolutionary Life Sciences, University of Groningen, Groningen, The Netherlands e-mail: [email protected] G. Leone e-mail: [email protected]
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Hydrobiologia
Keywords Parasite-mediated selection Diversification H
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