Spatial Change of Dominant Baltic Sea Demersal Fish Across Two Decades

Ecology and Evolution, Journal Year: 2025, Volume and Issue: 15(4)

Published: April 1, 2025

ABSTRACT The arange and biomass distribution of marine fish species offer insights into their underlying niches. Quantitative data are rare compared to occurrences remain underused in models (SDMs) explore realized niches—the actual space occupied by a shaped abiotic biotic factors. Local densities drive differences contributions ecological processes ecosystem function rather than through presence alone. If growth rate is strongly controlled macro‐environmental conditions, then predicting geographical abundance or should be possible. We collated 20 years (2001–2020) standardized scientific bottom trawl fit several versions hierarchical generalized additive using (kg km −2 ) four dominant demersal (Common dab, European flounder, plaice, Atlantic cod) within yearly seasonal (winter autumn) time windows. Covariates were represented with trawl‐level geographic information (position, depth) high‐resolution oceanographic features. This work illustrates species‐specific spatiotemporal patterns across two decades demonstrates superior predictive performance seasonally variable smoothing terms, revealing different responses predictors. Firstly, we find relative stasis Common dab which linked the salinity gradient western Baltic Sea but temperature seasons. Secondly, show both flounder plaice have increased relationships temperature, that switches between conditions based on season during spawning/feeding periods. Lastly, juvenile adult cod life stages shown declined most significantly Bornholm Deeps Gdańsk Deeps. For cod, conclude was less reliably predicted comparison other major demersals studied here, warranting dynamic fishing covariates as formerly commercial target. These approach more increasingly valuable constrain uncertainties biogeographic forecasting often rely annually‐averaged response curves, occurrence data, suitability maps rarely discriminate areas high low time.

Language: Английский

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Spatial stock structure of northern shrimp Pandalus borealis Krøyer, 1838 (Decapoda: Caridea: Pandalidae) in Canada’s Northwest Atlantic

Journal of Crustacean Biology, Journal Year: 2025, Volume and Issue: 45(2)

Published: March 30, 2025

Abstract Northern shrimp, Pandalus borealis Krøyer, 1838, are thought to form one biological unit, connected through larval dispersal, from Baffin Island in the north Grand Banks of Newfoundland and Labrador south. Current stock assessments suffer misalignments management, assessment, spatial scales. To adequately manage model dynamics, spatiotemporal patterns structure must be identified extent possible. We density life history traits (sex ratio female length) using modelling. Density peaked depths near 250–300 m (along slope edges), proportion males declined as depth increased, maximum length was predicted waters deeper than 400 more northern areas. These were combined with updated genomic dispersal illustrate underlying throughout study area. found two consistent north/south clusters time series, notably different current assessment management areas used region. Spatial heterogeneity shrimp dynamics resulting should considered within models ensure proper specification appropriate stock.

Language: Английский

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Shifting invertebrate distributions in the Barents Sea since pre-1900

Frontiers in Marine Science, Journal Year: 2024, Volume and Issue: 11

Published: Aug. 23, 2024

Marine invertebrate habitats are experiencing warming, and oceanic carbon dioxide levels on the rise. These changes result in shifts species distributions. Monitoring understanding these provides vital information because each plays a unique ecological role, human utilization of marine is intrinsically linked to their geographic locations. Here, we examine distribution invertebrates Barents Sea since pre-1900. Using data from Global Biodiversity Information Facility, analyzed occurrences across warm, cold mixed temperature zones, distinguishing between benthic pelagic taxa. Our findings indicate community five separated time periods, with most pronounced occurring after 1980 earlier warm zone. The significant biogeographical at scale occurred both realms, yet differing trajectories period past 2000, largely coincided increased Atlantic Water inflow reduced ice cover. Several taxa exhibited northward movement, falling into two categories: migrating Norwegian mainland shelf, those relocating southern areas colder temperatures. Some may serve as indicator for monitoring ecosystem change. study highlights importance long-term datasets quantifying impacts.

Language: Английский

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Assessing climate change vulnerability in Canadian marine conservation networks: implications for conservation planning and resilience

FACETS, Journal Year: 2024, Volume and Issue: 9, P. 1 - 15

Published: Jan. 1, 2024

Marine protected areas (MPAs) are critical in safeguarding biodiversity and ecosystem functions under climate change. The long-term effectiveness of these static conservation measures will depend on how well they represent current future ocean changes. Here, we use the Climate Risk Index for Biodiversity to assess vulnerability representation marine ecosystems within Canadian network (CMCN) two divergent emissions scenarios. We found that MPAs best Atlantic Canada (85% representativity overall, 93% Gulf Saint Lawrence low emissions), followed by Pacific (78%) Arctic (63%; lowest Eastern (41% high emissions) regions). Notably, with lower proportionally overrepresented CMCN. Broad-scale geographic targets employed Scotian Shelf-Bay Fundy planning process achieve over 90% vulnerabilities, underscoring importance ensuring habitat distribution enhance resilience, even if not explicitly prioritized. Moving towards Canada’s target protect 30% its waters 2030, prioritizing designation currently underrepresented climate-vulnerable regions may be crucial enhancing resilience CMCN amidst an ever-changing climate.

Language: Английский

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