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Roach is an invasive cyprinid fish species that has been introduced to many Irish lakes, causing broad changes in fish community dynamics. This paper examines whether roach invasion is associated with temporal change in the diet of pike in colonised systems. The seasonal diet of pike in three Irish lakes was compared between a historical (pre-roach) data set collated on a monthly basis in the 1960s...
This study finds that non‐native species and warming temperatures have significant negative effects on Arctic char Salvelinus alpinus abundance in Irish lakes. Eutrophication was not important at the range of total phosphorus tested (0.005–0.023 mg l−1). Model results predict that S. alpinus occur across the temperature range sampled (8.2–19.7°C) when non‐natives are absent, but S. alpinus catch is...
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