Journal
ESTUARINE COASTAL AND SHELF SCIENCE
Volume 97, Issue -, Pages 104-113Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ecss.2011.11.032
Keywords
microsatellites; isolation by distance; genetic subdivision; barriers to gene flow; coastal fish
Categories
Funding
- Swedish Research Council
- FORMAS
- BONUS Baltic Organisations' Network
- Division Of Environmental Biology
- Direct For Biological Sciences [0742181] Funding Source: National Science Foundation
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Stocks of whitefish (Coregonus maraena) in the northern part of the Baltic Sea have in many areas declined drastically during recent years. Causes for the decline are yet not fully understood, but knowledge on the genetic population structure of the species is pivotal for future conservation measures. In this study we analyse the genetic variation at seven microsatellite loci for whitefish from 18 different sites along the Swedish coast of the Baltic Sea. We found a strong dependence of isolation by distance (R = 0.73), and a week but rather fine scaled genetic structure. In addition, there were differences between more northern and southern sites in the population genetic structure, where the degree of differentiation appears to be stronger in the north compared to the south. The results suggest that whitefish is a species suitable for local management with a regional context of the management strategy. In addition, the findings corroborate what is previously known for other coastal fish species in the Baltic Sea, such as perch and pike, suggesting that the majority of gene flow occurs between adjacent areas. Finally, our results highlight the potential for genetic subdivision even when the dependence of isolation by distance is strong. (C) 2011 Elsevier Ltd. All rights reserved.
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