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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Veröffentlicht in:Fisheries oceanography Jg. 30; H. 6; S. 707 - 725
Hauptverfasser: Howard, Rebecca A., Ciannelli, Lorenzo, Waldo Wakefield, W., Fewings, Melanie R.
Format: Journal Article
Sprache:Englisch
Veröffentlicht: Oxford Blackwell Publishing Ltd 01.11.2021
Schlagworte:
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
Online-Zugang:Volltext
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Zusammenfassung: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.
Bibliographie:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
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ISSN:1054-6006
1365-2419
DOI:10.1111/fog.12553