Antagonistic effects of biological invasion and temperature change on body size of island ectotherms.

摘要: Aim Despite their potentially profound consequences, little is known about the impacts of interactions among environmental change drivers on indigenous species. For biological invasions, much theoretical prominence has been given to additive or synergistic with temperature change. However, empirical investigations are sparse. Here, we investigate outcomes between and invasions ectotherm body size in a temperate system. Location The sub-Antarctic Prince Edward Island group (46°54′ S, 37°45′ E). Methods We use long-term (24 years) data weevil species from Marion Islands. Invasive house mice, which prey four five species, present Island, while neighbouring mouse free. Theory predicts that higher temperatures, should decline across all previous work suggests size-selective predation by mice enhance this effect invaded island. Generalized linear models were used determine relative effects sex, island, altitude mean annual for each species. Results Temperature interact affect an antagonistic fashion. In not preyed invasive declining increasing consistent adjacent non-invaded islands. By contrast, smaller island show opposite size-temperature relationships mouse-free islands. Main conclusions Size declines keeping expectations temperatures. expectation met largely owing what appears be increased energetic demand predators colder years. These results emphasize will take range forms, humans may have substantial influences fundamental ecological patterns.