Novel ecological interactions alter physiological responses of range-extending tropical and local temperate fishes under ocean warming
2023
Sasaki, M | Mitchell, A | Booth, DJ | Nagelkerken, I
Global warming facilitates species range expansions leading to novel biological interactions between local and range expanding species Little is still known of how such novel interactions modify the performance of interacting species or how these interactions might be altered under climate change Here we used an aquarium experiment to investigate the novel ecological interactions between a poleward range extending coral reef damselfish tropical vagrant and a local temperate species temperate local collected from a climate warming hotspot in SE Australia We measured the effect of novel interactions isolated vs paired fish species on energy expenditure activity levels oxidative stress and antioxidant responses energy gain feeding rates and growth rates of both fish species under present day 23 C and future ocean temperatures 26 C Short term growth rates were faster in both species under novel interactions paired species regardless of elevated temperature Compared to isolated species activity level feeding rate and oxidative stress level were also higher in the paired temperate fish but not in the paired tropical fish The tropical fish showed an increased feeding rate and long term growth under elevated temperature irrespective of novel interactions We conclude that novel ecological interactions under climate change can be an important driver of physiological traits in sympatric tropical and temperate fishes and can mediate critical physiological performance of fishes under ocean warming
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