Heated competition: how climate change will affect non-native pumpkinseed Lepomis gibbosus and native perch Perca fluviatilis interactions in the UK
E Fobert, MG Fox, M Ridgway, GH Copp
JOURNAL OF FISH BIOLOGY | WILEY | Published : 2011
Heated and ambient temperature experimental ponds were used to examine competition between introduced pumpkinseed Lepomis gibbosus and native perch Perca fluviatilis in England, U.K., and how these interactions are likely to change under climate warming conditions. Results from three sets of two-week experiments indicated that in both species and in all sets, growth was faster in heated than in ambient temperature ponds. Growth of both P. fluviatilis and L. gibbosus in sympatry did not differ significantly from that observed in allopatric ponds. Diet analysis indicated that increased resource partitioning occurred when P. fluviatilis and L. gibbosus were reared in sympatry, with P. fluviatil..View full abstract
Conceived within the framework of an international network initiated with a NATO Science Programme 'Collaborative Linkage Grant' (awarded to G.H.C.), this study was funded jointly through research grants from the U.K. Department for Environment, Food and Rural Affairs (Defra), and by a Natural Science and Engineering Research Council of Canada Discovery Grant awarded to M.G.F. We thank the owners and staff at Tanyard Fishery for constructing the experimental ponds and providing necessary equipment and facilities. We would also like to thank M.J. Godard and G. Zieba for field and technical assistance, and two anonymous reviewers whose constructive comments greatly improved this manuscript.