Influence of temperature on the impacts of invasive goldfish species (Carassius spp.)

Poster session
Partie de:
vendredi 20 déc. 11:30 AM (1 heure)
Dîner   12:30 PM à 01:30 PM (1 heure)
Salle ABCD

The impacts and competitiveness of non-native aquatic species are expected to be altered by climate warming, particularly in north temperate regions. We examined the effect of warming on the feeding efficiencies and growth rates of two closely-related goldfishes with global invasion histories: Common Goldfish (Carassius auratus) and Prussian Carp (Carassius gibelio). Common Goldfish has an extensive invasion history in North America and it has formed dense populations in the western basin of Lakes Erie and in Hamilton Harbour, Lake Ontario, whereas Prussian Carp was first identified in Alberta and has not been reported from the Great Lakes basin but is a future invasion threat. Although the species are closely-related and morphologically similar, we hypothesize that they have distinct physiologies that affect their response to changing temperatures. Common Goldfish is a warmwater species, and there is concern that climate change is causing it to become increasingly abundant in the Great Lakes and elsewhere in North America, with concomitant increasing impacts. The thermal guild of Prussian Carp is unknown, but the species appears able to thrive in a variety of climates throughout its global range. Using individuals collected from established wild populations in Lac des Battures, Nun’s Island (for Common Goldfish) and Blood Indian Creek Reservoir, Alberta (Prussian Carp), we experimentally measured the maximum feeding rate and specific growth rate of both species to compare their feeding efficiencies at temperatures ranging from 18oC to 28oC. The results of these experiments were used to compare the potential per capita effects of these species under future temperatures projected for nearshore areas of the lower Great Lakes.

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