Life history change in response to fishing and an introduced predator in the East African cyprinid Rastrineobola argentea
Article first published online: 23 FEB 2012
© 2012 The Authors. Evolutionary Applications published by Blackwell Publishing Ltd.
This is an open access article under the terms of the Creative Commons Attribution-NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.
Volume 5, Issue 7, pages 677–693, November 2012
How to Cite
Sharpe, D. M. T., Wandera, S. B. and Chapman, L. J. (2012), Life history change in response to fishing and an introduced predator in the East African cyprinid Rastrineobola argentea. Evolutionary Applications, 5: 677–693. doi: 10.1111/j.1752-4571.2012.00245.x
- Issue published online: 30 OCT 2012
- Article first published online: 23 FEB 2012
- Received: 4 January 2012 Accepted: 9 January 2012
- anthropogenic stressors;
- contemporary phenotypic change;
- fisheries-induced evolution;
- invasive species;
- life history evolution;
Fishing and introduced species are among the most important stressors affecting freshwaters and can also be strong selective agents. We examined the combined effects of commercial fishing and an introduced predator (Nile perch, Lates niloticus) on life history traits in an African cyprinid fish (Rastrineobola argentea) native to the Lake Victoria basin in East Africa. To understand whether these two stressors have driven shifts in life history traits of R. argentea, we tested for associations between life history phenotypes and the presence/absence of stressors both spatially (across 10 Ugandan lakes) and temporally (over four decades in Lake Victoria). Overall, introduced Nile perch and fishing tended to be associated with a suite of life history responses in R. argentea, including: decreased body size, maturation at smaller sizes, and increased reproductive effort (larger eggs; and higher relative fecundity, clutch volume, and ovary weight). This is one of the first well-documented examples of fisheries-induced phenotypic change in a tropical, freshwater stock; the magnitude of which raises some concerns for the long-term sustainability of this fishery, now the most important (by mass) in Lake Victoria.