Responses of Invasive Round Goby Populations to Elevated Temperatures in the Great Lakes-St. Lawrence River System

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jeudi 19 déc. 09:45 AM (15 minutes)
Pause café   10:00 AM à 10:10 AM (10 minutes)
Salle CD
Freshwater lakes and rivers worldwide are subject to burgeoning effects of both biological invasion and climate change; interactions between these overlapping stressors should therefore be considered in risk assessments. Increasing temperatures of surface water in the Great Lakes-St. Lawrence River system will likely cause changes to the distributions, abundances and impacts of non-native species in the system. The Eurasian round goby (Neogobius melanostomus) has successfully established populations throughout the Great Lakes and their tributaries, and impact studies generally focus on its species-level interactions with native fishes and invertebrates. However, population-level differences in the invasion ecology of the round goby and its responses to climate warming remain largely unexplored. Through lab experiments, we measured the feeding efficiencies and CTmax for round gobies acclimated to current or future projected mean summer temperatures. Experimental subjects were collected from three separate populations distributed along a latitudinal gradient within the round goby’s introduced range: from the western basin of Lake Erie north to Hamilton Harbour and the upper St. Lawrence River near Montreal. We found that individuals from more southerly populations had lower maximum feeding rates at increased temperatures than those from northern populations; and CTmax increased with acclimation temperature across populations. Information on how climate warming can affect the feeding ecology and physiology of different populations can inform risk assessment and provide insight on the capacity for local adaptation of the round goby within its North American range.

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