Fish populations that experience rapid-range shift decline noticeably, up to 50 per cent over a decade. The populations affected most are those living on the northern poleward edges of their species' range. Researchers combined data from two large databases to examine the population numbers of range-shifting species.
"Species that are shifting their range quickly experience little change in their population size in their core range. But some of them experience a major collapse in their populations at the northern edges. "We have not yet identified any one underlying mechanism that explains these results, but we can speculate that the populations that are declining quickly are from species that are less plastic or unable to evolutionarily adapt to changing conditions," Lessard says."These may be the same ones that are dispersing very quickly toward colder water near the poles."
"Commercial fishes show a similar trend of population decline with rapid-range shift, and they were overall more likely to experience population decline than non-commercial species."
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