Fishery closures, more than predator release, increased persistence of nearshore fishes and invertebrates to the Deepwater Horizon oil spill DOI Open Access
Kiva L. Oken, Kenneth W. Able, Kim de Mutsert

et al.

Published: Aug. 4, 2022

The Deepwater Horizon disaster released 4.9 million barrels of oil into the Gulf Mexico. Despite clear evidence exposure and toxicity, there has been little population-level declines most nearshore fish invertebrate populations. Several hypotheses have proposed to explain this paradox. Two possibilities include a fishing moratorium following spill reductions in predation pressure predator die-offs. We tested both using mass-balance food web models quantify direct indirect population sensitivity perturbations bird dolphin mortality. In doing so, we developed new method allowing us responses one functional group changes across all fished groups. inferred support for compensatory mechanism, either release from or predation, when magnitude modeled increases far exceeded observations. found be likely potential mitigating especially penaeid shrimp, menhaden, blue crabs. Dolphin mortality may stability small sciaenids. Increased seabird did not lead major any examined. consideration trophic pathways within model produced wide range plausible responses, Broadly, work shows that spills are driver dynamics broader socioecological system, understanding impacts on populations requires complexity.

Language: Английский

Toward good practices for Bayesian data-rich fisheries stock assessments using a modern statistical workflow DOI
Cole C. Monnahan

Fisheries Research, Journal Year: 2024, Volume and Issue: 275, P. 107024 - 107024

Published: April 23, 2024

Language: Английский

Citations

4
Bitter crab disease dynamics in eastern Bering Sea Tanner and snow crab: An underestimated and emergent stressor DOI
Erin J. Fedewa,

Pamela C. Jensen,

Hamish J. Small

et al.

Fisheries Research, Journal Year: 2025, Volume and Issue: 283, P. 107307 - 107307

Published: Feb. 20, 2025

Language: Английский

Citations

0
Lingering impacts of the 2014-2016 northeast Pacific marine heatwave on seabird demography in Cook Inlet, Alaska (USA) DOI Creative Commons

SK Schoen,

ML Arimitsu,

CE Marsteller

et al.

Marine Ecology Progress Series, Journal Year: 2022, Volume and Issue: 737, P. 121 - 136

Published: Sept. 26, 2022

A protracted period (2014-2016) of anomalously warm water in the northeast Pacific Ocean precipitated an extensive die-off common murres Uria aalge (hereafter ‘murres’) during 2015-2016, accompanied by reduced colony attendance and reproductive success black-legged kittiwakes Rissa tridactyla (‘kittiwakes’) starting 2015. Most died starvation following a large-scale reduction abundance quality forage fish. To assess murre kittiwake recovery marine heatwave, we monitored their demographics at 2 colonies (Chisik Gull Islands) Cook Inlet, Alaska (USA), from 2016 to 2019. Compared historic data (1995-1999), observed declines increased variability productivity across species colonies, predation was widespread. At Chisik, where food limitations were studies, both experienced substantial population failures all 4 years (2016-2019) heatwave. Gull, typically productive failed fledge chicks for 3 (2016-2018) By 2019, recovered about half that studies (0.28 vs. 0.54 per pair), but populations had declined half. Kittiwake size quarter counts, reproduction alternated between complete breeding (2016/2018) high (2017/2019). These multi-year demographic impacts indicate lingering effects heatwave on through fish depletion predator disturbance, possibly other stressors. It remains unknown whether can rebound levels. If so, would likely take decades.

Language: Английский

Citations

11
Management strategy evaluation of harvest control rules for Pacific Herring in Prince William Sound, Alaska DOI Creative Commons
J. Zahner, Trevor A. Branch

ICES Journal of Marine Science, Journal Year: 2024, Volume and Issue: 81(2), P. 317 - 333

Published: Jan. 5, 2024

Abstract Management strategy evaluation (MSE) provides a mechanism to test the relative performance of alternative management strategies on fishery. For Pacific herring in Prince William Sound, Alaska, no directed fisheries have occurred over 30 years, providing an opportunity evaluate potential before fishery is opened. Here we and compare 10 harvest control rules (HCRs) ranging from simple threshold accounting for population age structure, biomass trends, weight distribution using MSE integrated with fully Bayesian stock assessment estimation model. We developed utility function that shows HCRs outperform more complex rules, especially catch stability. According this function, best rule had lower limit than current default rule, while worst higher threshold. Our simulations demonstrate sufficient computing power exists MSEs based methods, thus opening pathway simulation probabilistic which provide buffer against scientific uncertainty should reduce risk overfishing.

Language: Английский

Citations

1
Fishery Closures, More Than Predator Release, Increased Persistence of Nearshore Fishes and Invertebrates to the Deepwater Horizon Oil Spill DOI
Kiva L. Oken, Kenneth W. Able, Kim de Mutsert

et al.

Estuaries and Coasts, Journal Year: 2023, Volume and Issue: 46(7), P. 1907 - 1922

Published: July 27, 2023

Language: Английский

Citations

3
A novel approach for directly incorporating disease into fish stock assessment: a case study with seroprevalence data DOI Creative Commons
John T. Trochta, Maya L. Groner, Paul K. Hershberger

et al.

Canadian Journal of Fisheries and Aquatic Sciences, Journal Year: 2022, Volume and Issue: 79(4), P. 611 - 630

Published: Feb. 10, 2022

When estimating mortality from disease with fish population models, common surveillance data such as infection prevalence are not always informative, especially for fast-acting diseases that may go unobserved in infrequently sampled populations. In these cases, seroprevalence — the proportion of measurable antibody levels their blood be more informative. cases life-long immunity, require less frequent sampling intervals than and can reflect cumulative exposure history fish. We simulation tested usefulness an age-structured stock assessment model using viral hemorrhagic septicemia virus (VHSV) Pacific herring (Clupea pallasii) a case study. developed novel epidemiological to simulate dynamics fitted integrated catch-at-age equations estimate age- time-varying disease. found simulated provide accurate estimates disease-associated mortality. Importantly, even models misspecified nonstationary processes background or mortality, but included data, accurately estimated annual abundance.

Language: Английский

Citations

5
Influence of environmental and population factors on Prince William Sound herring spawning phenology DOI Creative Commons

BS Dias,

David W. McGowan, Robert W. Campbell

et al.

Marine Ecology Progress Series, Journal Year: 2022, Volume and Issue: 696, P. 103 - 117

Published: July 27, 2022

Shifts in spawning phenology may impact the early life stages of small pelagic fishes, affecting their first-year survival and recruitment. In Prince William Sound, Pacific herring is a key forage species that once supported commercial subsistence fisheries for many decades, but collapsed 1993 has yet to recover. Starting 1980, spawn timing shifted earlier by approximately 2-4 wk over 27 yr period, then abruptly later 3 next 7 yr. We quantified influence 15 environmental population-level covariates on these shifts using generalized linear models. Earlier was associated with higher biomass eastern sound older mean age western sound. Across entire sound, weaker downwelling, meridional winds, positive phase Pacific-North American teleconnection pattern, which characterized warmer North waters. These results are critical first step towards assessing how changes offspring potentially contribute persistent poor recruitment inhibited recovery Sound population.

Language: Английский

Citations

4
Predator damaged eel caught in coastal fisheries of the Baltic Sea DOI Creative Commons
Andreas C. Bryhn,

Sven Gunnar Lunneryd,

Sara Königson

et al.

Fisheries Research, Journal Year: 2023, Volume and Issue: 267, P. 106827 - 106827

Published: Aug. 21, 2023

Fish stock assessment may be constrained by incomplete knowledge on all mortality sources. Seal and cormorant raiding fishing gear to access the catch has been asserted fishers a considerable problem in small-scale European eel fishery along Swedish Baltic Sea coast. We analysed logbook data found predator losses fisheries at 13.6 ± 12.6% among catches landed 16 harbours subdivisions 25, 27 29 of 2019–2021. These numbers were used assess total damage this coast 12 10 tonnes caught landings value (about 10% retail value) 105,000 97,000 euros 2020. This constrain prospects declining commercial coastal fishery. Moreover, quantitative estimate useful future assessments local component, with potentially important implications for ecological, economic social sustainability.

Language: Английский

Citations

2
Temporal, environmental, and demographic correlates of Ichthyophonus sp. infections in mature Pacific herring populations DOI Creative Commons
Maya L. Groner,

E D Bravo-Mendosa,

A. H. MacKenzie

et al.

ICES Journal of Marine Science, Journal Year: 2023, Volume and Issue: 80(9), P. 2342 - 2355

Published: Sept. 28, 2023

Abstract Causes of population collapse and failed recovery often remain enigmatic in marine forage fish like Pacific herring (Clupea pallasii) that experience dramatic oscillations. Diseases such as ichthyophoniasis are hypothesized to contribute these declines, but lack long-term datasets frequently prevents inference. Analysis pathogen surveillance assessment spanning 2007–2019 indicate the age-based prevalence estimate Ichthyophonus infection was, on average, 54% greater among a collapsed (Prince William Sound, Alaska, USA) compared nearby (Sitka is relatively robust. During study years, ranged from 14 44% Prince Sound 5 33% Sitka Sound. At both sites, declined over time, with an average decrease 7% per year. Statistical analyses indicated between two populations was reduced by regional factors affecting were independent density. Infection positively correlated age negatively Decadal Oscillation. This demonstrates how synthesis environmental, stock assessment, disease data can be leveraged elucidate epidemiological trends diseases wild fish.

Language: Английский

Citations

1
Quantifying spatiotemporal variation of nearshore forage fish schools with aerial surveys in Prince William Sound, Alaska DOI Creative Commons
Daniel Donnelly, Mayumi L. Arimitsu,

Scott Pegau

et al.

Marine and Coastal Fisheries, Journal Year: 2024, Volume and Issue: 16(2)

Published: March 13, 2024

Abstract Objective Changes in abundance and distribution of schooling forage fish, such as the Pacific Sand Lance Ammodytes hexapterus Herring Clupea pallasii , can be difficult to document using traditional boat‐based methods, especially shallow, nearshore habitats frequented by these species. In contrast, fish schools are easily observed quantified from aircraft when light sea conditions favorable. We used aerial shoreline surveys assess interannual variability Prince William Sound, Alaska, during summers 2010 2012–2022. Methods During surveys, observers classified their size, species, (in some cases) age‐class. All observations were georeferenced along flight path, converted estimated surface area (m 2 ) based on school diameter, standardized effort (shoreline kilometers surveyed). Result widely distributed, densities varied annually; there several spikes density up 54.38 m /km interspersed among years lower average (7.73–25.57 /km). usually limited a few predictable locations. School consistent areas across years, high 50.98 low 0.15 2017. validated 88 conducted 2014–2016 2019–2022, which 76 (86%) correctly identified Conclusion Here, we provide indices over time shallow coastal Alaska. These generated offer an effective alternative for tracking they occur habitats.

Language: Английский

Citations

0