Global patterns of sex- and age-specific variation in seabird bycatch

Gianuca, Dimas; Phillips, Richard A.; Townley, Stuart; Votier, Stephen C.

doi:10.1016/j.biocon.2016.11.028

Cited by 68 publications

(70 citation statements)

References 90 publications

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“…Understanding the age structure of populations is a key aspect of animal ecology and conservation. Age estimate information can help to determine animal mortality, susceptibility to parasites, reproductive life history and the impact of anthropogenic activities (Froy, Phillips, Wood, Nussey, & Lewis, ; Gianuca, Phillips, Townley, & Votier, ; Musick, ; Scott, ). However, measuring the chronological age of many wild animals is a difficult task due to the lack of external changes that reflect age.…”

Section: Introductionmentioning

confidence: 99%

Age estimation in a long‐lived seabird (Ardenna tenuirostris) using DNA methylation‐based biomarkers

Paoli-Iseppi

Deagle

Polanowski

et al. 2019

Molecular Ecology Resources

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Age structure is a fundamental aspect of animal population biology. Age is strongly related to individual physiological condition, reproductive potential and mortality rate. Currently, there are no robust molecular methods for age estimation in birds. Instead, individuals must be ringed as chicks to establish known‐age populations, which is a labour‐intensive and expensive process. The estimation of chronological age using DNA methylation (DNAm) is emerging as a robust approach in mammals including humans, mice and some non‐model species. Here, we quantified DNAm in whole blood samples from a total of 71 known‐age Short‐tailed shearwaters (Ardenna tenuirostris) using digital restriction enzyme analysis of methylation (DREAM). The DREAM method measures DNAm levels at thousands of CpG dinucleotides throughout the genome. We identified seven CpG sites with DNAm levels that correlated with age. A model based on these relationships estimated age with a mean difference of 2.8 years to known age, based on validation estimates from models created by repeated sampling of training and validation data subsets. Longitudinal observation of individuals re‐sampled over 1 or 2 years generally showed an increase in estimated age (6/7 cases). For the first time, we have shown that epigenetic changes with age can be detected in a wild bird. This approach should be of broad interest to researchers studying age biomarkers in non‐model species and will allow identification of markers that can be assessed using targeted techniques for accurate age estimation in large population studies.

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Section: Introductionmentioning

confidence: 99%

Age estimation in a long‐lived seabird (Ardenna tenuirostris) using DNA methylation‐based biomarkers

Paoli-Iseppi

Deagle

Polanowski

et al. 2019

Molecular Ecology Resources

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“…Fay et al 2015). In some cases, immature seabirds have a tendency to be more vulnerable to fisheries bycatch than adults (Weimerskirch & Jouventin 1987, Murray et al 1993, Bregnballe & Frederiksen 2006), yet adult individuals are more often caught as fisheries bycatch in temperate and subpolar regions (Gianuca et al 2017). …”

Section: Introductionmentioning

confidence: 99%

Ontogenetic changes in at-sea distributions of immature short-tailed albatrosses Phoebastria albatrus

Orben¹,

O'Connor²,

Suryan³

et al. 2018

Endang. Species. Res.

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“…Sex-specific variation in demographic rates could also arise from differential association with anthropogenic factors that have impacts on survival rates. Sexual segregation of wandering and other albatrosses affects the relative vulnerability of males and fe males to bycatch by pelagic longline fleets (Bugoni et al 2011, Jiménez et al 2014, Gianuca et al 2017. Sexual segregation can also affect the relative risk of exposure to organic contaminants (Carravieri et al 2014).…”

Section: Implications For Population Dynamics and Conservationmentioning

confidence: 99%

Causes and consequences of individual variability and specialization in foraging and migration strategies of seabirds

Phillips¹,

Lewis²,

González‐Solís³

et al. 2017

Mar. Ecol. Prog. Ser.

148

172

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Technological advances in recent years have seen an explosion of tracking and stable isotope studies of seabirds, often involving repeated measures from the same individuals. This wealth of new information has allowed the examination of the extensive variation among and within individuals in foraging and migration strategies (movements, habitat use, feeding behaviour, trophic status, etc.) in unprecedented detail. Variation is underpinned by key life-history or state variables such as sex, age, breeding stage and residual differences among individuals (termed 'individual specialization'). This variation has major implications for our understanding of seabird ecology, because it affects the use of resources, level of intra-specific competition and niche partitioning. In addition, it determines the responses of individuals and populations to the environment and the susceptibility to major anthropogenic threats. Here we review the effects of season (breeding vs. nonbreeding periods), breeding stage, breeding status, age, sex and individual specialization on foraging and migration strategies, as well as the consequences for population dynamics and conservation.

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Global patterns of sex- and age-specific variation in seabird bycatch

Cited by 68 publications

References 90 publications

Age estimation in a long‐lived seabird (Ardenna tenuirostris) using DNA methylation‐based biomarkers

Age estimation in a long‐lived seabird (Ardenna tenuirostris) using DNA methylation‐based biomarkers

Ontogenetic changes in at-sea distributions of immature short-tailed albatrosses Phoebastria albatrus

Causes and consequences of individual variability and specialization in foraging and migration strategies of seabirds

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