An overview of the impacts of fishing on seabirds, including identifying future research directions

ICES Journal of Marine Science, Год журнала: 2023, Номер 80(9), С. 2380 - 2392

Опубликована: Ноя. 1, 2023

Abstract Knowledge of fisheries impacts, past and present, is essential for understanding the ecology conservation seabirds, but in a rapidly changing world, knowledge research directions require updating. In this Introduction articles Themed Set “Impacts fishing on seabirds”, we update our how impacts seabird communities identify areas future research. Despite awareness problems mitigation efforts >20 years, still negatively impact seabirds via effects bycatch, competition, discards. Bycatch continues to kill hundreds thousands annually, with negative population-level consequences. Fisheries forage fish (e.g. anchovy, sandeel, krill) by competing same stocks. Historically, discards supplemented diets, benefitting some species also increasing bycatch rates altering community composition. However, declining discard production has led potentially deleterious diet switches, reduced rates. To improve into these problems, make following recommendations: (1) data collection seabird–vessel interaction rates, effort vessel movements (especially small-scale fleets), compliance, (2) counter current bias towards temperate high-latitude ecosystems, larger-bodied particular life stages or times year adults during breeding), (3) advance currently poor combined other threats climate change, offshore renewables). addition, required under-studied aspects impacts: consequences depleted sub-surface predators, illegal, unreported unregulated fishing, artisanal emerging fisheries, such as those targeting mesopelagic fish, have received insufficient attention. Some shortfalls can be overcome new tools electronic monitoring, remote sensing, artificial intelligence, big data) quantifying addressing requires greater investment at appropriate spatio-temporal scales, more inclusive dialogue from grassroots national international levels governance industries continue evolve.

Язык: Английский

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Increased parental effort fails to buffer the cascading effects of warmer seas on common guillemot demographic rates

Journal of Animal Ecology, Год журнала: 2023, Номер 92(8), С. 1622 - 1638

Опубликована: Май 22, 2023

Abstract Climate warming can reduce food resources for animal populations. In species exhibiting parental care, effort is a ‘barometer’ of changes in environmental conditions. A key issue the extent to which variation buffer demographic rates against change. Seabirds breed large, dense colonies and globally are major predators small fish that often sensitive ocean warming. We explored causes consequences annual as indicated by standardised checks proportions chicks attended both, one or neither parent, population common guillemots Uria aalge over four decades during there was marked marine climate chick diet. predicted that, be an effective buffer, would link between conditions effort, but not rates. Environmental influenced multiple aspects prey delivered parents their with species, length energy density all spring sea surface temperature (sSST) current and/or previous year. Overall, mean daily intake declined significantly when sSST year higher. accordance our first prediction, we found increased However, increase insufficient maintain intake. contrast second had such growth rate fledging success chicks, body mass overwinter survival breeding adults decreased significantly. Common guillemot were unable compensate effectively temperature‐mediated feeding through behavioural flexibility, resulting immediate size because lower adult potentially longer‐term impacts on recruitment productivity. These findings highlight critical species' responses future change will buffering offer resilience deteriorating

Язык: Английский

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Halting predicted vertebrate declines requires tackling multiple drivers of biodiversity loss

bioRxiv (Cold Spring Harbor Laboratory), Год журнала: 2025, Номер unknown

Опубликована: Янв. 2, 2025

Abstract Anthropogenic threats are reshaping Earth’s biodiversity at an unprecedented rate and scale 1–3 . Conservation policies often prioritise like habitat loss exploitation based on their global prevalence. However, these assessments rarely quantify the impacts of individual or interacting threats, potential masking true effects Anthropocene 4–6 Here, we quantitatively analyse trends 3,129 vertebrate populations worldwide with documented exposure to specific multiple threats. Populations impacted solely by exploitation, most prevalent do not show fastest declines. Rather, exposed disease, invasive species, pollution, climate change decline more rapidly. – along act as additive interactive amplifying population Notably, contribute declines, than temporal spatial sources variation. Finally, counterfactual scenarios that achieve non-negative trends, need mitigate These findings underscore urgency addressing compounding halt suggest local-scale may be severe previously recognized.

Язык: Английский

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Spatial distribution of seabird biomass removal and overlap with fisheries in a large marine ecosystem

ICES Journal of Marine Science, Год журнала: 2025, Номер 82(4)

Опубликована: Апрель 1, 2025

Abstract Globally, seabirds remove a prey biomass equivalent to commercial fishery landings, suggesting likely competition for resources that will vary spatially and seasonally. Using extensive aerial surveys combined with species-specific energetic requirements, we calculated mapped at-sea removal of by during the breeding non-breeding seasons compared this seasonal distribution fishing effort. The was concentrated in coastal areas, up 6.39 kg/km2/day consumed season 4.3 season. Offshore, average consumption ranged from 0.28–1.53 0.75–1.84 seasons, respectively. Total across study area (the Irish Exclusive Economic Zone covering an 341 183 km2) estimated at around 441.2 tonnes/day 478 season, highlighting significant role play marine ecosystems. fine-scale spatial significantly correlated effort both inshore offshore potential and/or attraction vessels discards.

Язык: Английский

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The effect of timing and abundance of lesser sandeel on the breeding success of a North Sea seabird community

Marine Ecology Progress Series, Год журнала: 2024, Номер 727, С. 1 - 17

Опубликована: Янв. 9, 2024

Understanding the responses of seabirds to climate-induced variations in phenology and abundance their prey is key developing ecosystem-based fisheries management measures that benefit higher trophic levels. The match/mismatch hypothesis (MMH) emphasizes need consider synchrony seasonal cycles predators prey, while match/mismatch/abundance (MMAH) proposes may reinforce/compensate mismatch effects. This study considers effects both availability lesser sandeel Ammodytes marinus on hatching, fledging breeding success 5 seabird species: black-legged kittiwake Rissa tridactyla , Atlantic puffin Fratercula arctica razorbill Alca torda common guillemot Uria aalge European shag Gulosus aristotelis . Consistent with MMH, temporal asynchrony between schedules affected productivity 4 species. were either reinforced or compensated by for some species, supporting MMAH. Breeding late-breeding was high when conditions favoured cost could be earlier-breeding puffin. Differential at different stages season suggest distinct mechanisms are involved. most evident sandeel-reliant seabirds. As further disruption anticipated under current climate crisis, present an important step towards understanding bottom-up environmental change

Язык: Английский

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Commercial fishery no-take zones for African penguins minimize fisheries losses at the expense of conservation gains

ICES Journal of Marine Science, Год журнала: 2024, Номер 81(8), С. 1632 - 1646

Опубликована: Авг. 20, 2024

Abstract The African penguin population has declined precipitously in recent decades, and if current rates of decline persist, this species could become extinct the wild by 2035. Resource extraction small pelagic fish prey purse-seine fishery around breeding colonies been identified as a demographically meaningful threat to penguins. Consequently, long-term, effective no-take zones have endorsed an expert panel scientists constituted South government. Here, we consider six largest that currently hold 76% global population. We evaluate adequacy different zone options using trade-off mechanism recommended panel. For all except Bird Island, Algoa Bay, which is subject least fishing pressure, delineations are assessed having little benefit no cost fishery. Four include ≤50% penguins’ core foraging areas. Alternative approximate more balanced offer impactful alternatives fisheries restrictions. Given urgent need implement evidence-based conservation interventions for endangered penguin, recommend substitution with those proposed herein.

Язык: Английский

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Silent uncrewed surface vehicles reveal the diurnal vertical distribution of lesser sandeel

ICES Journal of Marine Science, Год журнала: 2024, Номер unknown

Опубликована: Дек. 6, 2024

Abstract Lesser sandeel (Ammodytes marinus) exhibits a peculiar diel vertical migration (DVM) during the feeding season, burying into seabed at night and emerging daytime to form schools that feed on zooplankton. Large may consist of pelagic component searching for prey bottom connected by collective bridge-like formations. However, temporal variation in schools’ distribution is poorly understood. In this study, 38 200 kHz acoustic data recorded with Saildrones were used examine schooling dynamics their main season May–June. A total 1497 identified linear discriminant analysis displayed two distinct components throughout season: one zone near seabed. The was distributed deepest noon had similar pattern zooplankton DVM, suggesting followed prey. Their diurnal ascension greater both distance hours May than June, decline motivation towards end season. These findings made possible long-term monitoring silent Saildrones, which did not seem affect natural behaviour schools.

Язык: Английский

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A crowded ocean: The need for demographic and movement data in seabird conservation

Ocean & Coastal Management, Год журнала: 2023, Номер 244, С. 106833 - 106833

Опубликована: Сен. 1, 2023

Язык: Английский

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A framework to unlock marine bird energetics

Journal of Experimental Biology, Год журнала: 2023, Номер 226(24)

Опубликована: Ноя. 22, 2023

Energetics can provide novel insights into the roles of animals, but employing an energetics approach has traditionally required extensive empirical physiological data on focal species, something that be challenging for those inhabit marine environments. There is therefore a demand framework through which to estimate energy expenditure from readily available data. We present energetic costs associated with important time- and energy-intensive behaviours across nine families bird (including seabirds, ducks, divers grebes) ecological guilds. demonstrate worked example, calculating year-round great auk, Pinguinus impennis, under three migration scenarios, thereby illustrating capacity this make predictions data-deficient species. comprehensive model power novel, quantitative influence birds within their ecosystems.

Язык: Английский

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Population trends of marine versus terrestrial bird species on Skúgvoy, Faroe Islands, 1961–2023

Bird Study, Год журнала: 2024, Номер unknown, С. 1 - 13

Опубликована: Дек. 11, 2024

Capsule Long-term breeding bird censuses on the Faroese Island of Skúgvoy showed differing trends declining seabird populations and more stable terrestrial birds.

Язык: Английский

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