Population Structure and Dispersal Patterns within and between Atlantic and Mediterranean Populations of a Large-Range Pelagic Seabird

Genovart, Meritxell; Thibault, Jean‐Claude; Igual, José Manuel; Bauzà-Ribot, Maria del Mar; Rabouam, Corinne; Bretagnolle, Vincent

doi:10.1371/journal.pone.0070711

Cited by 31 publications

(35 citation statements)

References 72 publications

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“…; see also Genovart et al. for a discussion of its taxonomic status). Scopoli's shearwaters nest in individual burrows, which are located on the ground in rock crevices.…”

Section: Methodsmentioning

confidence: 99%

The Effect of Moonlight on Scopoli's Shearwater Calonectris diomedea Colony Attendance Patterns and Nocturnal Foraging: A Test of the Foraging Efficiency Hypothesis

et al. 2014

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Moonlight is known to affect the nocturnal behaviour and activity rhythms of many organisms. For instance, predators active at night may take advantage from increased visibility afforded by the moon, while prey might regulate their activity patterns to become less detectable. Many species of pelagic seabirds attend their colony only at night, in complete darkness, avoiding approaching their nest sites under moonlight. This behaviour has been most often interpreted as an antipredator adaptation ('predation avoidance' hypothesis). However, it may also reflect a lower foraging efficiency during moonlit nights ('foraging efficiency' hypothesis). Indeed, moonlight may reduce prey availability because preferred seabird prey is known to occur at higher depths in moonlit nights. Using high-accuracy behavioural information from data loggers, we investigated the effect of moonlight on colony attendance and at-sea nocturnal foraging in breeding Scopoli's shearwaters Calonectris diomedea. We found that birds departing for self-feeding trips around the full moon performed longer trips than those departing around the new moon. On nights when the moon was present only partly, nest burrow entrances took place largely in the moonless portion of the night. Moreover, contrary to predictions from the 'foraging efficiency' hypothesis, nocturnal foraging activity increased according to moonlight intensity, suggesting that birds increased their foraging activity when prey became more detectable. This study strengthens the idea that colony attendance behaviour is strictly controlled by moonlight in shearwaters, which is possibly related to the perception of a predation risk.

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“…; see also Genovart et al. for a discussion of its taxonomic status). Scopoli's shearwaters nest in individual burrows, which are located on the ground in rock crevices.…”

Section: Methodsmentioning

confidence: 99%

The Effect of Moonlight on Scopoli's Shearwater Calonectris diomedea Colony Attendance Patterns and Nocturnal Foraging: A Test of the Foraging Efficiency Hypothesis

et al. 2014

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“…comm. ; Genovart et al ). Genetic differences between populations are consequently low (Genovart et al ) and exchanges of individuals among populations might also be sufficient to preclude significant variations in the composition of uropygial secretions, but no data support this for the moment.…”

Section: Discussionmentioning

confidence: 99%

Chemical labels differ between two closely related shearwater taxa

Gabirot

Raux

Dell’Ariccia

et al. 2016

Journal of Avian Biology

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Chemical signals may be the basis of interspecifi c recognition and speciation in many animals. To test whether a chemical label allowing recognition between closely related species exists in seabirds, we investigated two closely related taxa breeding sympatrically at some localities: Cory ' s and Scopoli ' s shearwaters. Procellariiform seabirds are ideal for this study because they have a well-developed olfactory system and unequalled associated capabilities among birds. We analysed and compared the relative volatile compounds composition of the uropygial gland secretions of Cory ' s and Scopoli ' s shearwaters. As the volatile components from uropygial secretions might also provide some critical eco-chemical information about population origin and sex, we also examined variations in the volatile compounds between populations and sexes in Cory ' s shearwater. Th e chemical data were obtained using gas chromatography -mass spectrometry techniques looking for the presence of these three particular labels: species, population and gender. We found diagnostic diff erences in uropygial secretions between the two species of shearwaters and smaller but signifi cant variation between populations of Cory ' s shearwater in the Atlantic. No signifi cant diff erences were observed between males and females. Individuals might thus use the chemical variation between species to recognize and mate with conspecifi cs, especially at localities where both species breed sympatrically. Geographical variation in chemical composition of uropygial secretions suggests that selective forces might vary according to locality, and might represent a key in the species recognition. Further behavioural bioassays are needed to determine whether or not these species labels are signals allowing reproductive isolation between these two taxa. Finally, one of the aims of our study was to test easier methods than freezing for storing uropygial gland secretions in the fi eld. We describe here a new possibility for the storage of uropygial secretion samples at ambient temperature in the fi eld, providing an alternative, simple protocol for the sampling of avian chemosignals.

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“…Low survival rates in this species might be compensated for by recruitment, which was here estimated in the form of seniority probability and encompasses not only local recruitment but also immigration. Previous studies already suggested that even if the species is mostly philopatric (97%), there is non-negligible dispersal (particularly natal dispersal) between colonies (Genovart et al 2013b).…”

Section: A S E S T U D Ymentioning

confidence: 99%

Hierarchical modelling of population growth rate from individual capture–recapture data

et al. 2014

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Summary1. Estimating rates of population change is essential to achieving theoretical and applied goals in population ecology, and the Pradel (1996, Biometrics, 52: 703.) temporal symmetry method permits direct estimation and modelling of the growth rate of open populations, using capture-recapture data from marked animals. 2. We present a Bayesian formulation of the Pradel approach that permits a hierarchical modelling of the biological and sampling processes. Two parametrizations for the temporal symmetry likelihood are presented and implemented into a general purpose software in BUGS language. 3. We first consider a set of simulated scenarios to evaluate performance of a Bayesian variable selection approach to test the temporal linear trend on survival and seniority probability, population growth rate and detectability. We then provide an example application on individual detection information of three species of burrowing nesting seabirds, whose populations cannot be directly counted. For each species, we assess the strength of evidence for temporal random variation and the temporal linear trend on survival probability, population growth rate and detectability. 4. The Bayesian formulation provides more flexibility, by easily allowing the extension of the original fixed time effects structure to random time effects, an option that is still impractical in a frequentist framework.

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Population Structure and Dispersal Patterns within and between Atlantic and Mediterranean Populations of a Large-Range Pelagic Seabird

Cited by 31 publications

References 72 publications

The Effect of Moonlight on Scopoli's Shearwater Calonectris diomedea Colony Attendance Patterns and Nocturnal Foraging: A Test of the Foraging Efficiency Hypothesis

The Effect of Moonlight on Scopoli's Shearwater Calonectris diomedea Colony Attendance Patterns and Nocturnal Foraging: A Test of the Foraging Efficiency Hypothesis

Chemical labels differ between two closely related shearwater taxa

Hierarchical modelling of population growth rate from individual capture–recapture data

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