| fish status survey of nordic lakes: effects of acidification, eutrophication and stocking activity on present fish species composition. | the status of fish populations in 3821 lakes in norway, sweden and finland was assessed in 1995-1997. the survey lakes were chosen by stratified random sampling from all (126 482) fennoscandian lakes > or = 0.04 km2. the water chemistry of the lakes was analyzed and information on fish status was obtained by a postal inquiry. fish population losses were most frequent in the most highly acidified region of southern norway and least common in eastern fennoscandia. according to the inquiry results, ... | 2003 | 12733793 |
| morphological divergence and origin of sympatric populations of european whitefish (coregonus lavaretus l.) in lake femund, norway. | combining morphological and genetic analysis, we compared patterns of diversification within and between morphs among sympatric european whitefish (coregonus lavaretus l.) populations in lake femund, norway. seven external populations, from potential colonization routes into lake femund were included. we found that deep-, shallow-, river- and bay spawning populations are distinct morphs in lake femund. within morphs, populations range from being similar genetically (fst=0-0.005) among deep-spawn ... | 2005 | 15842498 |