Open AccessVattenkemi och fiskbeståndens sammansättning i storlommens Gavia arctica häckningssjöar, samt en jämförelse med smålommens Gavia stellata fiskesjöar
Author(s) -
Margaretha Eriksson,
Heidi Paltto
Publication year - 2010
Publication title -
ornis svecica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.104
H-Index - 14
eISSN - 2003-2633
pISSN - 1102-6812
DOI - 10.34080/os.v20.22640
Subject(s) - esox , pike , perch , rutilus , fishery , alkalinity , fishing , nutrient , percidae , mercury (programming language) , population , biology , etheostoma , fish <actinopterygii> , ecology , chemistry , demography , organic chemistry , sociology , computer science , programming language
Breeding performance of Black-throated Diver Gavia arctica was compared to water chemistry, light penetration and density of fish in 122 breeding lakes in Sweden with a total of 184 pairs (1.5 pairs per lake, about 3% of the national population). The breeding lakes were on average nutrient-poor, and 12% of them had a low buffering capacity (alkalinity 90% of the fishing lakes used by Red-throated Diver. Reproduction was related to high abundance of Perch, and the survival of chicks to light penetration. Poor nutrient status in combination with low pH or alkalinity in approximatively 10% of the breeding lakes of Black-throated Diver and probably more than 30% of the fishing lakes of Red-throated Diver, indicate susceptibility of exposure to methylmercury. This finding should be considered in relation to recent reports of increased contents of mercury in freshwater fish.