Age, sex, and breeding status shape a complex foraging pattern in an extremely long‐lived seabird

Jaeger, A.; Goutte, Aurélie; Lecomte, Vincent; Richard, Pierre; Chastel, Olivier; Barbraud, Christophe; Weimerskirch, Henri; Cherel, Yves

doi:10.1890/13-1376.1

Cited by 35 publications

(54 citation statements)

References 51 publications

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“…; Jaeger et al. ), as well as on adult and offspring sex (e.g., Beaulieu et al. ), and such effects could potentially cause food‐induced sex‐specific differences in condition in relation to parental sex and age.…”

Section: Discussionmentioning

confidence: 99%

Sex-specific pathways of parental age effects on offspring lifetime reproductive success in a long-lived seabird

2015

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The conditions under which individuals are reared vary and sensitivity of offspring to such variation is often sex-dependent. Parental age is one important natal condition with consequences for aspects of offspring fitness, but reports are mostly limited to short-term fitness consequences and do not take into account offspring sex. Here we used individual-based data from a large colony of a long-lived seabird, the common tern Sterna hirundo, to investigate longitudinal long-term fitness consequences of parental age in relation to both offspring and parental sex. We found that recruited daughters from older mothers suffered from reduced annual reproductive success. Recruited sons from older fathers were found to suffer from reduced life span. Both effects translated to reductions in offspring lifetime reproductive success. Besides revealing novel sex-specific pathways of transgenerational parental age effects on offspring fitness, which inspire studies of potential underlying mechanisms, our analyses show that reproductive senescence is only observed in the common tern when including transgenerational age effects. In general, our study shows that estimates of selective pressures underlying the evolution of senescence, as well as processes such as age-dependent mate choice and sex allocation, will depend on whether causal transgenerational effects exist and are taken into account.

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Section: Discussionmentioning

confidence: 99%

Sex-specific pathways of parental age effects on offspring lifetime reproductive success in a long-lived seabird

2015

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“…Repeatability in the arrival date at the breeding grounds was notably high, particularly given the extensive variation among individuals (within a 48 d range). This could reflect the varying costs and benefits of the timing of migration between individuals (Møller 1994), or among birds of different age-classes or experience levels (Jaeger et al 2014). For example, competitive individuals can evict weak competitors from territories even if they arrive latter, and might consequently benefit from a shorter overall attendance period at the breeding grounds (Forstmeier 2002).…”

Section: Discussionmentioning

confidence: 99%

Consistent variation in individual migration strategies of brown skuas

Krietsch¹,

Hahn²,

Kopp³

et al. 2017

Mar. Ecol. Prog. Ser.

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Seabirds show remarkable variability in migration strategies among individuals and populations. In this study, we analysed 47 migrations of 28 brown skuas Catharacta antarctica lonnbergi breeding on King George Island in the Maritime Antarctic. Brown skuas from this population used a large area during the non-breeding period north of 55°S, including parts of the Patagonian Shelf, Argentine Basin and South Brazil Shelf, areas which are characterised by high levels of marine productivity. However, individual birds utilised only a subset of these areas, adopting 1 of 4 distinct migration strategies to which they were highly faithful between years, and showed high repeatability in departure and arrival dates at the breeding ground. Although they spent the majority of the non-breeding season within a particular region, almost all individuals used the same area in the late winter, exploiting its seasonal peak in productivity. Overall, these results indicate consistent individual variation in migration strategies that may reflect a combination of genetic control and individual experience, but with considerable flexibility to shift distribution in response to prevailing environmental conditions. KEY WORDS: Catharacta antarctica lonnbergi · Seabird ecology · Light-level geolocation · Non-breeding distribution · Individual consistency · Ocean primary productivity · Migratory connectivity Contribution to the Theme Section 'Individual varability in seabird foraging and migration'

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“…These differences can lead to sex‐specific variation in demographic rates (Jaeger et al . ). However, the influence of environmental conditions such as wind speed and direction on sex differences in foraging effort or efficiency has not been investigated in detail.…”

Section: Introductionmentioning

confidence: 97%

Contrasting responses of male and female foraging effort to year‐round wind conditions

Lewis

Phillips

Burthe

et al. 2015

Journal of Animal Ecology

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Summary There is growing interest in the effects of wind on wild animals, given evidence that wind speeds are increasing and becoming more variable in some regions, particularly at temperate latitudes. Wind may alter movement patterns or foraging ability, with consequences for energy budgets and, ultimately, demographic rates.These effects are expected to vary among individuals due to intrinsic factors such as sex, age or feeding proficiency. Furthermore, this variation is predicted to become more marked as wind conditions deteriorate, which may have profound consequences for population dynamics as the climate changes. However, the interaction between wind and intrinsic effects has not been comprehensively tested.In many species, in particular those showing sexual size dimorphism, males and females vary in foraging performance. Here, we undertook year‐round deployments of data loggers to test for interactions between sex and wind speed and direction on foraging effort in adult European shags Phalacrocorax aristotelis, a pursuit‐diving seabird in which males are c. 18% heavier.We found that foraging time was lower at high wind speeds but higher during easterly (onshore) winds. Furthermore, there was an interaction between sex and wind conditions on foraging effort, such that females foraged for longer than males when winds were of greater strength (9% difference at high wind speeds vs. 1% at low wind speeds) and when winds were easterly compared with westerly (7% and 4% difference, respectively).The results supported our prediction that sex‐specific differences in foraging effort would become more marked as wind conditions worsen. Since foraging time is linked to demographic rates in this species, our findings are likely to have important consequences for population dynamics by amplifying sex‐specific differences in survival rates.

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Age, sex, and breeding status shape a complex foraging pattern in an extremely long‐lived seabird

Cited by 35 publications

References 51 publications

Sex-specific pathways of parental age effects on offspring lifetime reproductive success in a long-lived seabird

Sex-specific pathways of parental age effects on offspring lifetime reproductive success in a long-lived seabird

Consistent variation in individual migration strategies of brown skuas

Contrasting responses of male and female foraging effort to year‐round wind conditions

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