High individual repeatability of the migratory behaviour of a long-distance migratory seabird

Movement Ecology, Год журнала: 2022, Номер 10(1)

Опубликована: Фев. 5, 2022

Abstract Background Understanding the evolution of migration requires knowledge patterns, sources, and consequences variation in migratory behaviour, a need exacerbated by fact that many species show rapid population declines require knowledge-based conservation measures. We therefore detailed on spatial temporal distribution individuals across their annual cycle, quantify how components behaviour vary within among individuals. Methods tracked 138 journeys undertaken 64 adult common terns ( Sterna hirundo ) from breeding colony northwest Germany to identify spatiotemporal these birds evaluate individual repeatability eleven traits describing behaviour. Results Birds left early September, then moved south along East Atlantic Flyway. Wintering areas were reached mid-September located at west coasts West Africa as well Namibia South Africa. wintering late March mid-April. The timing, total duration distance migration, location areas, moderately highly repeatable (repeatability indexes: 0.36–0.75, 0.65–0.66, 0.93–0.94, 0.98–1.00, respectively), estimates not strongly affected population-level inter-annual Conclusions found large between-individual tern strong several aspects

Язык: Английский

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Climate change impacts on seabirds and marine mammals: The importance of study duration, thermal tolerance and generation time

Ecology Letters, Год журнала: 2021, Номер 25(1), С. 218 - 239

Опубликована: Ноя. 10, 2021

Abstract Understanding climate change impacts on top predators is fundamental to marine biodiversity conservation, due their increasingly threatened populations and importance in ecosystems. We conducted a systematic review of the effects (prolonged, directional change) variability seabirds mammals. extracted data from 484 studies (4808 published were reviewed), comprising 2215 observations demography, phenology, distribution, diet, behaviour, body condition physiology. The likelihood concluding that had an impact increased with study duration. However, temporal thresholds for be discernibly varied 10 29 years depending species, biological response oceanic region. Species narrow thermal ranges relatively long generation times more often reported affected by change. This provides important framework future assessments, guidance response‐ region‐specific dimensions need considered when reporting Finally, we found tropical regions non‐breeding life stages poorly covered literature, concern should addressed enable better understanding vulnerability

Язык: Английский

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Marine bird mass mortality events as an indicator of the impacts of ocean warming

Marine Ecology Progress Series, Год журнала: 2023, Номер 737, С. 161 - 181

Опубликована: Май 30, 2023

The frequency and severity of marine heatwaves (MHWs), an emergent property global warming, has led to large-scale disruptions ecosystems. As upper trophic species, birds reflect shifts in structure stability; therefore, a sharp increase bird mortality is clear signal ecosystem impact. In this study, we analyzed 29 yr (1993-2021) beached monitoring data (~90000 surveys) identify events throughout the Northeast Pacific Alaska, USA, examined linkages ocean-climate variability. Mortality were documented study period, but massive (>500 km extent, >10 carcasses -1 ) occurred infrequently (n = 5), with unprecedented sequence from 2014-2019. Event characteristics, including encounter rate (carcasses ), duration, spatial positively related prior-year averaged sea surface temperature anomaly, event magnitude (product rate, duration) displaying step-like transition, increasing 5-fold between +0°C +1°C above baseline (1981-2010) temperatures. more frequently following MHWs, common (at 1-6 10-16 mo after heatwave onset) was observed California Current large 3 prolonged MHW events. Following second wave at onset, consistent 16 period depressed carcass rates ensued. Given continued our results point frequent potential for new lower carrying capacity Pacific.

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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Mechanisms of high ammonium loading promoted phosphorus release from shallow lake sediments: A five-year large-scale experiment

Water Research, Год журнала: 2023, Номер 245, С. 120580 - 120580

Опубликована: Сен. 5, 2023

The unprecedented global increase in the anthropogenic-derived nitrogen (N) input may have profound effects on phosphorus (P) dynamics and potentially lead to enhanced eutrophication as demonstrated short-term mesocosm experiments. However, role of N-influenced P release is less well studied large-scale ecosystems. To gain more insight into ecosystem effects, we conducted a five-year experiment ten ponds (700-1000 m2 each) with two types sediments five targeted total N concentrations (TN) by adding NH4Cl fertilizer (0.5, 1, 5, 10, 25 mg L-1). results showed that: (ⅰ) sediment increased significantly when TN exceeded 10-25 L-1. (ⅱ) most pronounced occurred summer from rich organic matter (OMSed). (ⅲ) TN, algal biomass, fish non-algal turbidity, pH, OMSed were dominant factors explaining release, suggested piecewise structural equation modeling. We propose several mechanisms that stimulated i.e. high ammonium causes stoichiometric N:P imbalance induce alkaline phosphatase production dissolved uptake phytoplankton, leading inorganic diffusion gradient between water; higher pelagic induced phytoplankton led resuspension through disturbance; low oxygen level upper caused nitrification decomposition settled and, finally, long-term application-induced acidification net effect hydrolysis, nitrification, denitrification; revealed this study shed new light complex processes underlying N-stimulated implications also for strategies used restoring eutrophicated lakes.

Язык: Английский

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Impacts of marine heatwaves may be mediated by seabird life history strategies

Marine Ecology Progress Series, Год журнала: 2023, Номер 737, С. 9 - 23

Опубликована: Июнь 1, 2023

Marine heatwaves (MHWs) are periods of anomalously warm water associated with changes in ocean structure, based on the horizontal advection masses and atmospheric exchange heat. The longest MHWs persist for many months, dramatic effects marine life have been reported from around world. As top-order predators, seabirds particularly sensitive to MHWs, high levels mortality some events, but not others. Thus, prediction impacts is straightforward, as linearly related simple measures MHW intensity, persistence, areal coverage. We describe biological responses expected seabirds, demographic parameters geographic proximity phenological timing respect seabirds. interactions between will be complex (with likely unpredictable) extend over broad spatial temporal scales. anomalous conditions breeding colonies, their overlap foraging areas, degree which coincide pre-breeding seasons presently generate greatest pressures seabird populations. posit that area-restricted species, terms movement strategies, at greater risk non-linear complicate prediction. may mediated by history strategies.

Язык: Английский

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Effects of a fishery closure and prey abundance on seabird diet and breeding success: Implications for strategic fisheries management and seabird conservation

Biological Conservation, Год журнала: 2023, Номер 281, С. 109990 - 109990

Опубликована: Март 29, 2023

Industrial forage fish fisheries may reduce prey availability affecting diet and breeding success of marine predators. However, evidence for effects on predator demography remains rare, hindering evaluation their impact populations. Using 25 years data the commercial lesser sandeel fishery in north-western North Sea, we evaluated effectiveness closure safeguarding four seabird species - black-legged kittiwake, common guillemot, Atlantic puffin razorbill. We also tested a scientific closed area success. quantified how changes chicks were influenced by abundance sandeels alternative species, European sprat, potential behavioural disturbance fishing prey. Finally, examined chick have shaped long-term variation The period operation was associated with decline kittiwake colonies foraging ranges overlapping area, from 52 % young fledged pre-fishery to 23 during operation. Breeding increased approximately 10 following 2018. document wide uncertainty around this increase success, partly driven responses individual colonies. For razorbill found no negative nor positive arising its closure. an fishery. proportion positively albeit only weak puffin. Fishing effort decreased diet, lower component consisting 0-group puffin, Our findings provide quantitative demography, highlighting species-specific nature responses, difficulties teasing apart drivers amongst ongoing environmental change. Time-area closures show promise as tool productivity some species. identify important caveats strategic conservation aspirations net gain.

Язык: Английский

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Synthesizing connectivity information from migratory marine species for area-based management

Biological Conservation, Год журнала: 2023, Номер 283, С. 110142 - 110142

Опубликована: Май 31, 2023

Understanding the areas used by migratory marine animals and their movements is critical in supporting management decisions that target conservation. This especially important for long-lived species with large geographic extents are more vulnerable to multiple threats. We conducted a literature review on data collected 173 mammal, fish, sea turtle, seabird determined tracking animal telemetry methods was most effective tool demonstrating ecological connectivity. From references included review, we found turtles than other taxa, information all four taxa northern hemisphere. In addition, 30 % of presented process raw tracks, only 11 mentioned repository archiving data, there no significant trend number current conservation level. For case study (Atlantic bluefin tuna, humpback whale, loggerhead wandering albatross), published adults descriptions sites focused feeding breeding activities, while migration connectivity among were not well represented. Although reviewed, several knowledge gaps existed limitations within publications direct applications area-based management. provided recommendations address research guidance improve integration into decisions.

Язык: Английский

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Using model‐based distance sampling to estimate decadal population change in Northern Gannets (Morus bassanus) across periods spanned by different at‐sea survey methods

Ibis, Год журнала: 2025, Номер unknown

Опубликована: Янв. 10, 2025

Seabirds are important sentinels of climate and ecosystem change, but many breeding populations difficult to monitor because the remoteness inaccessibility their colonies, sometimes cryptic nature nests burrows. Large‐scale monitoring seabird at sea can also be used estimate population trends inform conservation efforts. However, although modern survey techniques absolute abundance, older methodologies have recorded only relative, possibly biased, abundance. These approaches exemplified in western North Atlantic, where seabirds been surveyed using methods (Eastern Canada Sea, or ECSAS) since 2006, under simpler PIROP ( Programme intégré de recherches sur les oiseaux pélagiques ) protocol from 1965 1992. Methodological differences between these types limit our understanding long‐term populations, both Atlantic elsewhere. Hence, we conducted simultaneous surveys 2014 2021 advances model‐based distance sampling allow comparison across longer‐term datasets. We validated methodology by comparing Northern Gannets Morus bassanus at‐sea data colony surveys. The trend abundance (2.69% increase annually) was similar that colonies (2.91% annually), suggesting combined approach changes robustly period spanned two programmes. envision analyses could reveal decadal status species currently lack such information absence counts.

Язык: Английский

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Status, Breeding, and Conservation of Black-Naped Tern (Sterna sumatrana) in the Alphonse Group, Seychelles, 2008–2022

Waterbirds, Год журнала: 2025, Номер 47(3)

Опубликована: Фев. 21, 2025

Язык: Английский

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