Insights into drivers of population declines offer a ray of hope for migratory fishes in the temperate rainforest

Abstract

A central goal in ecology is quantifying how environmental and anthropogenic processes influence populations. This can be particularly challenging for migratory species with complex life histories, including many salmonid fishes because the individuals that can be counted at a given place and time (e.g., adults returning to a river) often represent a mixture of multiple cohorts that were exposed to different conditions at earlier life stages. Researchers face an additional layer of complexity when changes in climate are confounded with changes in food webs and human impacts. Despite these complications, identifying population drivers remains a high priority for ecologists and natural resource managers to guide conservation, harvest, and land-use policies.

Genetic analyses reveal panmixia in Indian waters and population subdivision across Indian Ocean and Indo-Malay Archipelago for Decapterus russelli

“…In Alosa pseudoharengus, variations in patterns of genetic structure between landlocked and anadromous populations have been observed 30 . Several species of migratory fish are reported to have experienced staggering population size declines worldwide [31][32][33] . Pelagic sharks (Alopias spp., Carcharodon carcharias and Sphyrna spp.)…”