The effects of climate, oceanography, and habitat on the distribution and abundance of northern California Current continental shelf groundfishes

The California Current Ecosystem has experienced variable climate regimes, hypoxia, and marine heatwave events that have the potential to impact groundfishes and their associated fisheries. Using bottom trawl survey data collected by NOAA Fisheries, we assessed changes over the last four decades in...

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Vydáno v:	Fisheries oceanography Ročník 30; číslo 6; s. 707 - 725
Hlavní autoři:	Howard, Rebecca A., Ciannelli, Lorenzo, Waldo Wakefield, W., Fewings, Melanie R.
Médium:	Journal Article
Jazyk:	angličtina
Vydáno:	Oxford Blackwell Publishing Ltd 01.11.2021
Témata:	Abundance Anoplopoma fimbria assemblage Atheresthes stomias Benthos collecting devices Bottom temperature bottom trawl Bottom trawling Citharichthys sordidus Climate Climate effects Composition continental shelf Continental shelves demersal fish Dissolved oxygen Economic importance Economics ecosystems Eopsetta jordani Fisheries Fishery data Grain size groundfishes Habitats Heat waves Herbivores Hypoxia Marine ecosystems Marine fishes northern California Current Oceanography Offshore Ophiodon elongatus Pacific Ocean Parophrys vetulus probability of presence Species diversity Species richness Surveying surveys temperature Trawling United States > US California Pacific Ocean
ISSN:	1054-6006, 1365-2419
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Popis
Shrnutí:	The California Current Ecosystem has experienced variable climate regimes, hypoxia, and marine heatwave events that have the potential to impact groundfishes and their associated fisheries. Using bottom trawl survey data collected by NOAA Fisheries, we assessed changes over the last four decades in northern California Current continental shelf (≤200 m) groundfish assemblage composition, species' presence, and relationships to environmental and habitat variables. We focus on the currently understudied continental shelf area, due to its ecological and economic importance, especially after the recent opening of historically important areas to trawling. We found a temporally consistent separation in groundfish assemblages between depth zones based on NMS analysis using species found in over 1% of samples, with shallow, mid‐, and deep shelf groupings. Grain size, species richness, and diversity were associated with assemblage composition. Then, focusing on petrale sole, rex sole, lingcod, arrowtooth flounder, sablefish, English sole, Pacific sanddab, and Dover sole, we examined what factors impact groundfish presence and abundance on the shelf. Bottom temperature, sediment characteristics, and depth were correlated with abundance for all species. These results corroborate previous work indicating recent reductions in presence of hypoxia‐intolerant species. Shallow‐water groundfishes known to tolerate warmer water and low dissolved oxygen concentrations exhibit reductions offshore, possibly a result of low recruitment. There have been significant spatiotemporal changes in the shelf groundfish populations over the past several decades, and while assemblage composition over most of the shelf remains consistent, single species distributional shifts may impact access to target species in newly reopened areas.
Bibliografie:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 14 content type line 23
ISSN:	1054-6006 1365-2419
DOI:	10.1111/fog.12553