Endothermy makes fishes faster but does not expand their thermal niche

Lucy Harding, Andrew Jackson, Adam Barnett, Ian Donohue, Lewis Halsey, Charlie Huveneers, Carl Meyer, Yannis Papastamatiou, Jayson Semmens, Erin Spencer, Yuuki Watanabe & Nicholas Payne
1. Regional endothermy has evolved several times in marine fishes, and two competing hypotheses are generally proposed to explain the evolutionary drivers behind this trait: thermal niche expansion and elevated cruising speeds. Evidence to support either hypothesis is equivocal, and the ecological advantages conferred by endothermy in fishes remain debated. 2. By compiling published biologging data and collecting precise speed measurements from free-swimming fishes in the wild, we directly test whether endothermic fishes encounter broader...
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9 downloads reported since publication in 2021.

These counts follow the COUNTER Code of Practice, meaning that Internet robots and repeats within a certain time frame are excluded.
What does this mean?