Effects of spring onset and summer duration on fish species distribution and biomass along the Northeast United States continental shelf

Effects of spring onset and summer duration on fish species distribution and biomass along the... Studies documenting distributional shifts of fishes typically rely on time series of annual sampling events with fixed seasonal timing and limited temporal range. Meanwhile, as temperatures along the Northeast continental shelf have increased, the seasonal cycle also shifted towards earlier spring warming and longer summers. Seasonal migrations of fish and macroinvertebrates on the continental shelf in the Northeast US are thought to be primarily controlled by temperature and as such likely follow the temperature phenology of the shelf. This study sought to determine whether apparent changes in fish biomass and distributions are linked to spring warming phenology and/or duration of summer, the effective growing season for most species. We hypothesized that the earlier spring thermal transition would occur earlier and would cause centers of biomass to be more poleward during the spring survey. We also expected lengthening summers, primarily a function of later fall cooling, to cause centers of biomass in the fall survey to be more poleward and for biomass on the shelf to be greater within and following longer growing seasons. We did not detect a strong effect of the timing of the spring thermal transition in sea surface temperature on the distribution or abundance for most of the 43 fish stocks that we examined. However, later fall cooling and longer summers had a strong effect on both abundance and biomass of many fish stocks. These findings suggest that more focus should be placed on the length of the growing season and population-level processes that result in distributional shifts and changes in abundance. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Reviews in Fish Biology and Fisheries Springer Journals

Effects of spring onset and summer duration on fish species distribution and biomass along the Northeast United States continental shelf

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Springer International Publishing
Copyright © 2017 by Springer International Publishing Switzerland
Life Sciences; Freshwater & Marine Ecology; Zoology
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