| Records |
| Author |
Nolan Paul M, Stephen Dobson F, Nicolaus Marion, Karels Tim J, McGraw Kevin J, Jouventin Pierre, |
| Title |
Mutual Mate Choice for Colorful Traits in King Penguins
|
Type |
Journal Article |
| Year |
2010 |
Publication |
Ethology |
Abbreviated Journal |
|
| Volume |
116 |
Issue |
7 |
Pages |
635 -644 |
| Keywords |
|
| Abstract |
Abstract While studies of mate choice based on male color pattern are ubiquitous, studies of mate choice based on ornamental color traits in sexually monomorphic species are less common. We conducted manipulative field experiments on two color ornaments of king penguins (Aptenodytes patagonicus), the size of auricular patches of orange feathers and degree of UV reflectance from beak spots, to determine how the degree of ornamentation influenced pairing rate. In a reduction of auricular patch size, females paired significantly more quickly than males in both control and experimental samples. When this bias was taken into account statistically, pairing of individuals with reduced auricular patches was significantly delayed. We also reduced, but did not eliminate, UV reflectance from beak spots by applying a UV filter; no sex difference in pairing rate was evident in this experiment. Treated birds paired significantly more slowly than untreated control individuals, taking more than a week longer to pair on average than their unmanipulated counterparts, a result that was significant for males and approached significance for females. Our results may indicate mutual mate choice via UV reflectance of the beak spot. Given that this is a species where breeding is extremely slow and considerable investment by both males and females is required for successful reproduction, our results support the hypothesis that in such species, sexual selection might act on the same ornament in both sexes.
|
| Programme |
354 |
| Campaign |
|
| Address |
|
| Corporate Author |
|
Thesis |
|
Publisher  |
Blackwell Publishing Ltd |
Place of Publication |
|
Editor |
|
| Language |
|
Summary Language |
|
Original Title |
|
| Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
| Series Volume |
|
Series Issue |
|
Edition |
|
| ISSN |
1439-0310 |
ISBN |
|
Medium |
|
| Area |
|
Expedition |
|
Conference |
|
| Notes |
|
Approved |
yes |
| Call Number |
|
Serial |
333 |
| Permanent link to this record |
| |
|
| |
| Author |
Gauthier Gilles, Milot Emmanuel, Weimerskirch Henri, |
| Title |
Small-scale dispersal and survival in a long-lived seabird, the wandering albatross
|
Type |
Journal Article |
| Year |
2010 |
Publication |
Journal of Animal Ecology |
Abbreviated Journal |
|
| Volume |
79 |
Issue |
4 |
Pages |
879 -887 |
| Keywords |
colony size, conspecific attraction, fidelity to colony, philopatry, |
| Abstract |
Summary 1.Dispersal is a fundamental but still poorly known process in population dynamics and several hypotheses have been proposed to explain its patterns. We studied natal and breeding dispersal and survival in a long-lived seabird, the wandering albatross (Diomedea exulans L.), and examined several hypotheses concerning dispersal patterns in birds. 2.We applied multi-state capturerecapture models to a 36-year data set (19692004) collected at three albatross colonies on Île de Possession, Crozet Islands. Because the species has biennial reproduction, we introduced unobservable states in the model to account for the absence of individuals in those years. 3.Adults were highly faithful to their nesting colony but colony fidelity, as well as survival rate, differed slightly among colonies (fidelity ranged from 0·957 to 0·977). Breeding fidelity was highest in the colony where survival was lowest and individuals were not more likely to change colony following a failed breeding attempt than after a successful one. The colony that attracted most dispersers had the lowest density of nesting birds. 4.Philopatry (the probability that young return to breed at a birth site) was generally high but variable among colonies (ranging from 0·70 to 0·92), and survival of young differed little. Philopatry was highest in the largest colony, where the availability of potential mates was presumably greatest. However, among dispersing individuals, the colony that had the lowest density of nesting individuals, not the largest colony, attracted the most recruits. 5.Although size of the colony influenced the decision to stay or to leave in young, density was most influential in the selection of a new colony among both adult and young dispersers. Our results support the hypothesis that philopatry is the strategy favoured by most recruits and that conspecific attraction can explain variation in the level of philopatry among colonies but not settlement patterns among dispersing individuals.
|
| Programme |
109 |
| Campaign |
|
| Address |
|
| Corporate Author |
|
Thesis |
|
| Publisher |
Blackwell Publishing Ltd |
Place of Publication |
|
Editor |
|
| Language |
|
Summary Language |
|
Original Title |
|
| Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
| Series Volume |
|
Series Issue |
|
Edition |
|
| ISSN |
1365-2656 |
ISBN |
|
Medium |
|
| Area |
|
Expedition |
|
Conference |
|
| Notes |
|
Approved |
yes |
| Call Number |
|
Serial |
344 |
| Permanent link to this record |
| |
|
| |
| Author |
PÉRON CLARA, AUTHIER MATTHIEU, BARBRAUD CHRISTOPHE, DELORD KARINE, BESSON DOMINIQUE, WEIMERSKIRCH HENRI, |
| Title |
Interdecadal changes in at-sea distribution and abundance of subantarctic seabirds along a latitudinal gradient in the Southern Indian Ocean
|
Type |
Journal Article |
| Year |
2010 |
Publication |
Global Change Biology |
Abbreviated Journal |
Glob Chang Biol |
| Volume |
16 |
Issue |
7 |
Pages |
1895 -1909 |
| Keywords |
at-sea survey, Bayesian, climate change, mixture model, populations trends, Procellariiform, zero inflation, |
| Abstract |
Abstract Long-term demographic studies have recently shown that global climate change together with increasing direct impacts of human activities, such as fisheries, are affecting the population dynamics of marine top predators. However, the effects of these factors on species distribution and abundance at sea are still poorly understood, particularly in marine ecosystems of the southern hemisphere. Using a unique long-term data set of at-sea observations, we tested for interdecadal (1980s vs. 2000s) changes in summer abundance and distribution of 12 species of Albatrosses and Petrels along a 30° latitudinal gradient between tropical and Antarctic waters of the southern Indian Ocean. There were contrasting effects of climate change on subantarctic seabird distribution and abundance at sea. While subtropical waters showed the highest rate of warming, the species that visited this water mass showed the greatest changes in distribution and abundance. The abundance of Wandering Albatrosses (Diomedea exulans), White-chinned Petrels (Procellaria aequinoctialis) and Giant Petrels (Macronectes sp.) declined markedly, whereas the other species showed contrasting trends or did not change. With the exception of the White-chinned Petrel, these decreases were at least partly related to regional increase in sea surface temperature. The southward shift of Wandering Albatross and Prions (Pachyptila spp.) distributions could be ascribed to species redistribution or decrease in abundance due to warming of the subtropical waters. Surprisingly, White-chinned Petrel distribution shifted northward, suggesting more complex mechanisms. This study is the first to document a shift in species range in the Southern Ocean related to climate change and contrasting abundance changes. It suggests that some species might experience more severe impacts from climate change depending on the water masses they visit. As climate changes are predicted to continue in the next decades, understanding species responses to climate change is crucial for conservation management, especially when their conservation status is critical or unknown.
|
| Programme |
109 |
| Campaign |
|
| Address |
|
| Corporate Author |
|
Thesis |
|
| Publisher |
Blackwell Publishing Ltd |
Place of Publication |
|
Editor |
|
| Language |
|
Summary Language |
|
Original Title |
|
| Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
| Series Volume |
|
Series Issue |
|
Edition |
|
| ISSN |
1365-2486 |
ISBN |
|
Medium |
|
| Area |
|
Expedition |
|
Conference |
|
| Notes |
|
Approved |
yes |
| Call Number |
|
Serial |
358 |
| Permanent link to this record |
| |
|
| |
| Author |
RIVALAN PHILIPPE, BARBRAUD CHRISTOPHE, INCHAUSTI PABLO, WEIMERSKIRCH HENRI, |
| Title |
Combined impacts of longline fisheries and climate on the persistence of the Amsterdam Albatross Diomedia amsterdamensis
|
Type |
Journal Article |
| Year |
2010 |
Publication |
Ibis |
Abbreviated Journal |
Ibis (Lond. 1859) |
| Volume |
152 |
Issue |
1 |
Pages |
6 -18 |
| Keywords |
Diomedea amsterdamensis, fishing effort, Indian Ocean Dipole, multistate capture-recapture models, stochastic matrix models, |
| Abstract |
Incidental capture of seabirds in longline fishing gear is a central issue in the conservation of many long-lived marine species. Despite growing evidence of climate-induced effects on population trends of long-lived species, climate change remains generally overlooked in most risk assessments of seabirds. Because variation in climate may interact with the detrimental effects of bycatch, considering climate is of great importance, especially in the context of ongoing global warming. This paper examines the combined effects of bycatch and climate change on the persistence of one of the worlds rarest birds, the Amsterdam Albatross Diomedea amsterdamensis, which has a single population in the upland plateau of Amsterdam Island (Southeast Indian Ocean). Using continuous monitoring from 1983 onwards, we first estimated the relationship between climate and the species demographic parameters. We then built a stochastic matrix population model to estimate the population growth rate and the probability that the population declines below the level recorded in 1983 of nine breeding pairs under different scenarios involving the joint effects of additional mortality caused by longline fisheries and climate change. The results suggest that the demography of the Amsterdam Albatross is influenced by climate in both breeding and wintering grounds and that these relationships may to some extent compensate for the impact of additive bycatch mortality. However, these compensatory effects would be negligible if the annual additional mortality exceeds around six individuals per year, suggesting that the resumption of longline fishery in the foraging range of the Amsterdam Albatross would rapidly put this species at risk of extinction.
|
| Programme |
109 |
| Campaign |
|
| Address |
|
| Corporate Author |
|
Thesis |
|
| Publisher |
Blackwell Publishing Ltd |
Place of Publication |
|
Editor |
|
| Language |
|
Summary Language |
|
Original Title |
|
| Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
| Series Volume |
|
Series Issue |
|
Edition |
|
| ISSN |
1474-919X |
ISBN |
|
Medium |
|
| Area |
|
Expedition |
|
Conference |
|
| Notes |
|
Approved |
yes |
| Call Number |
|
Serial |
414 |
| Permanent link to this record |
| |
|
| |
| Author |
Bailleul Frédéric, Authier Matthieu, Ducatez Simon, Roquet Fabien, Charrassin Jean-Benoît, Cherel Yves, Guinet Christophe, |
| Title |
Looking at the unseen: combining animal bio-logging and stable isotopes to reveal a shift in the ecological niche of a deep diving predator
|
Type |
Journal Article |
| Year |
2010 |
Publication |
Ecography |
Abbreviated Journal |
|
| Volume |
33 |
Issue |
4 |
Pages |
709 -719 |
| Keywords |
|
| Abstract |
Understanding how marine top predators exploit their environment is a central topic in marine ecology. Among all methodologies used to investigate this part of ecology, electronic devices are very useful to track animals' movements and foraging habitats, but they do not provide any dietary information. Stable isotopes provide information on trophic levels but remain imprecise to identify small spatial-scale habitats. In this study, we combined the two approaches to obtain a synoptic view of the foraging behaviour variability of southern elephant seals Mirounga leonina. Our results suggested marked differences in distribution, diving behaviour, foraging habitats, trophic levels, and dietary habits of elephant seals according to their sex and age. Thus, we characterized main foraging habitats over the Kerguelen-Heard Plateau and the Antarctic shelf for juvenile males, while females foraged mainly in oceanic waters of the Polar Frontal Zone and the Antarctic Zone. In addition, we highlighted the ontogeny of niche partitioning in this sexually dimorphic species. While females did not exhibit a major dietary shift in relation to their age and their breeding status, a different picture emerged for males. Young males had a trophic level identical to that of all females. However, at 34yr of age, males showed a progressive increase in trophic level. The inter-annual combination of bio-logging and stable isotopes could provide a powerful tool to investigate possible shifts in ecological niche between years according to environmental changes.
|
| Programme |
109 |
| Campaign |
|
| Address |
|
| Corporate Author |
|
Thesis |
|
| Publisher |
Blackwell Publishing Ltd |
Place of Publication |
|
Editor |
|
| Language |
|
Summary Language |
|
Original Title |
|
| Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
| Series Volume |
|
Series Issue |
|
Edition |
|
| ISSN |
1600-0587 |
ISBN |
|
Medium |
|
| Area |
|
Expedition |
|
Conference |
|
| Notes |
|
Approved |
yes |
| Call Number |
|
Serial |
463 |
| Permanent link to this record |
| |
|
| |
| Author |
Goutte Aurélie, Antoine Élodie, Weimerskirch Henri, Chastel Olivier, |
| Title |
Age and the timing of breeding in a long-lived bird: a role for stress hormones?
|
Type |
Journal Article |
| Year |
2010 |
Publication |
Functional Ecology |
Abbreviated Journal |
|
| Volume |
24 |
Issue |
5 |
Pages |
1007 -1016 |
| Keywords |
age, glucocorticoids, laying date, snow petrel (Pagodroma nivea), stress response, |
| Abstract |
Summary 1.Young birds often reproduce later in the season than older ones, with poorer breeding success, but the proximate mechanisms involved in such a pattern remain poorly studied, especially in long-lived species. One possible mechanism is the endocrine stress response which is accompanied by the release of corticosterone. Elevated corticosterone levels can trigger physiological and behavioural responses that may delay or even suppress reproduction. 2.We tested the hypothesis that the delayed timing of breeding of young birds may be related to a greater susceptibility to stress compared with older ones during the pre-laying period of the breeding season. For this purpose, known-age (744 years old) pre-laying snow petrels, Pagodroma nivea, were monitored for baseline and acute stress-induced corticosterone levels. We examined whether baseline and stress-induced corticosterone levels were related to age, and whether they could influence the decision to breed and egg-laying date. 3.Young snow petrels were more likely to skip the breeding season and to breed later than middle-aged birds. In addition, the oldest birds bred later than middle-aged ones, suggesting a possible senescence on laying dates. Baseline corticosterone levels were independent of age but young and very old birds were more sensitive to stress than middle-aged ones. However, there was no effect of stress-induced corticosterone levels on breeding decision and egg-laying date. Elevated baseline corticosterone levels during the pre-laying period were associated with a higher probability of skipping breeding in females and a delayed timing of egg-laying in both sexes. 4.These results suggest that the greater susceptibility of young breeders to stress was not the functional mechanism explaining their delayed timing of breeding. Baseline corticosterone levels, although independent of age, appear to be a more likely mediator of breeding decision and egg-laying date. In long-lived birds, the relationship between age and timing of breeding may be rather indirect, as other age-related factors such as breeding experience or foraging skills may have a deeper impact on baseline corticosterone than age per se.
|
| Programme |
109 |
| Campaign |
|
| Address |
|
| Corporate Author |
|
Thesis |
|
| Publisher |
Blackwell Publishing Ltd |
Place of Publication |
|
Editor |
|
| Language |
|
Summary Language |
|
Original Title |
|
| Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
| Series Volume |
|
Series Issue |
|
Edition |
|
| ISSN |
1365-2435 |
ISBN |
|
Medium |
|
| Area |
|
Expedition |
|
Conference |
|
| Notes |
|
Approved |
yes |
| Call Number |
|
Serial |
466 |
| Permanent link to this record |
| |
|
| |
| Author |
Tape Carl, Liu Qinya, Maggi Alessia, Tromp Jeroen, |
| Title |
Seismic tomography of the southern California crust based on spectral-element and adjoint methods
|
Type |
Journal Article |
| Year |
2010 |
Publication |
Geophysical Journal International |
Abbreviated Journal |
|
| Volume |
180 |
Issue |
1 |
Pages |
433 -462 |
| Keywords |
Inverse theory, Body waves, Surface waves and free oscillations, Seismic tomography, Computational seismology, Crustal structure, |
| Abstract |
SUMMARY We iteratively improve a 3-D tomographic model of the southern California crust using numerical simulations of seismic wave propagation based on a spectral-element method (SEM) in combination with an adjoint method. The initial 3-D model is provided by the Southern California Earthquake Center. The data set comprises three-component seismic waveforms (i.e. both body and surface waves), filtered over the period range 230 s, from 143 local earthquakes recorded by a network of 203 stations. Time windows for measurements are automatically selected by the FLEXWIN algorithm. The misfit function in the tomographic inversion is based on frequency-dependent multitaper traveltime differences. The gradient of the misfit function and related finite-frequency sensitivity kernels for each earthquake are computed using an adjoint technique. The kernels are combined using a source subspace projection method to compute a model update at each iteration of a gradient-based minimization algorithm. The inversion involved 16 iterations, which required 6800 wavefield simulations. The new crustal model, m16, is described in terms of independent shear (VS) and bulk-sound (VB) wave speed variations. It exhibits strong heterogeneity, including local changes of ±30 per cent with respect to the initial 3-D model. The model reveals several features that relate to geological observations, such as sedimentary basins, exhumed batholiths, and contrasting lithologies across faults. The quality of the new model is validated by quantifying waveform misfits of full-length seismograms from 91 earthquakes that were not used in the tomographic inversion. The new model provides more accurate synthetic seismograms that will benefit seismic hazard assessment.
|
| Programme |
133 |
| Campaign |
|
| Address |
|
| Corporate Author |
|
Thesis |
|
| Publisher |
Blackwell Publishing Ltd |
Place of Publication |
|
Editor |
|
| Language |
|
Summary Language |
|
Original Title |
|
| Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
| Series Volume |
|
Series Issue |
|
Edition |
|
| ISSN |
1365-246X |
ISBN |
|
Medium |
|
| Area |
|
Expedition |
|
Conference |
|
| Notes |
|
Approved |
yes |
| Call Number |
|
Serial |
514 |
| Permanent link to this record |
| |
|
| |
| Author |
LECLAIRE SARAH, MULARD HERVÉ, WAGNER RICHARD H, HATCH SCOTT A, DANCHIN ÉTIENNE, |
| Title |
Can Kittiwakes smell? Experimental evidence in a Larid species
|
Type |
Journal Article |
| Year |
2009 |
Publication |
Ibis |
Abbreviated Journal |
Ibis (Lond. 1859) |
| Volume |
151 |
Issue |
3 |
Pages |
584 -587 |
| Keywords |
bird, Black-legged Kittiwake, Rissa tridactyla, odour, olfaction., |
| Abstract |
|
| Programme |
1162 |
| Campaign |
|
| Address |
|
| Corporate Author |
|
Thesis |
|
| Publisher |
Blackwell Publishing Ltd |
Place of Publication |
|
Editor |
|
| Language |
|
Summary Language |
|
Original Title |
|
| Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
| Series Volume |
|
Series Issue |
|
Edition |
|
| ISSN |
1474-919X |
ISBN |
|
Medium |
|
| Area |
|
Expedition |
|
Conference |
|
| Notes |
|
Approved |
yes |
| Call Number |
|
Serial |
1787 |
| Permanent link to this record |
| |
|
| |
| Author |
Bailleul Frédéric, Authier Matthieu, Ducatez Simon, Roquet Fabien, Charrassin Jean-Benoît, Cherel Yves, Guinet Christophe, |
| Title |
Looking at the unseen: combining animal bio-logging and stable isotopes to reveal a shift in the ecological niche of a deep diving predator
|
Type |
Journal Article |
| Year |
2010 |
Publication |
Ecography |
Abbreviated Journal |
|
| Volume |
33 |
Issue |
4 |
Pages |
709 -719 |
| Keywords |
|
| Abstract |
Understanding how marine top predators exploit their environment is a central topic in marine ecology. Among all methodologies used to investigate this part of ecology, electronic devices are very useful to track animals' movements and foraging habitats, but they do not provide any dietary information. Stable isotopes provide information on trophic levels but remain imprecise to identify small spatial-scale habitats. In this study, we combined the two approaches to obtain a synoptic view of the foraging behaviour variability of southern elephant seals Mirounga leonina. Our results suggested marked differences in distribution, diving behaviour, foraging habitats, trophic levels, and dietary habits of elephant seals according to their sex and age. Thus, we characterized main foraging habitats over the Kerguelen-Heard Plateau and the Antarctic shelf for juvenile males, while females foraged mainly in oceanic waters of the Polar Frontal Zone and the Antarctic Zone. In addition, we highlighted the ontogeny of niche partitioning in this sexually dimorphic species. While females did not exhibit a major dietary shift in relation to their age and their breeding status, a different picture emerged for males. Young males had a trophic level identical to that of all females. However, at 34yr of age, males showed a progressive increase in trophic level. The inter-annual combination of bio-logging and stable isotopes could provide a powerful tool to investigate possible shifts in ecological niche between years according to environmental changes.
|
| Programme |
452 |
| Campaign |
|
| Address |
|
| Corporate Author |
|
Thesis |
|
| Publisher |
Blackwell Publishing Ltd |
Place of Publication |
|
Editor |
|
| Language |
|
Summary Language |
|
Original Title |
|
| Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
| Series Volume |
|
Series Issue |
|
Edition |
|
| ISSN |
1600-0587 |
ISBN |
|
Medium |
|
| Area |
|
Expedition |
|
Conference |
|
| Notes |
|
Approved |
yes |
| Call Number |
|
Serial |
1957 |
| Permanent link to this record |
| |
|
| |
| Author |
Ropert-Coudert Y, Kato A, Poulin N, Grémillet D, |
| Title |
Leg-attached data loggers do not modify the diving performances of a foot-propelled seabird
|
Type |
Journal Article |
| Year |
2009 |
Publication |
Journal of Zoology |
Abbreviated Journal |
J. Zool. (Lond.) |
| Volume |
279 |
Issue |
3 |
Pages |
294 -297 |
| Keywords |
bio-logging, GLS, impact, data-recorder, seabirds, diving, |
| Abstract |
Abstract Global location sensors (GLS) are increasingly being used to determine animal position at sea. Their small size and weight means that they can be attached to the leg of volant birds with supposedly little impact on the flight ability. However, very few studies have investigated the impact that foot-attached devices may have on the diving ability of foot-propelled seabirds. We compared the diving activity of two groups of free-ranging great cormorants Phalacrocorax carbo carbo, both groups carrying identical time-depth recorders attached to the tail, and one group also having leg-attached GLS. Our results showed that there were no differences between the two groups in any of the diving parameters investigated, at least over the short term. Caution should be exercised when extrapolating to other species, especially those smaller than great cormorants, and also when deploying GLS over longer periods.
|
| Programme |
388 |
| Campaign |
|
| Address |
|
| Corporate Author |
|
Thesis |
|
| Publisher |
Blackwell Publishing Ltd |
Place of Publication |
|
Editor |
|
| Language |
|
Summary Language |
|
Original Title |
|
| Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
| Series Volume |
|
Series Issue |
|
Edition |
|
| ISSN |
1469-7998 |
ISBN |
|
Medium |
|
| Area |
|
Expedition |
|
Conference |
|
| Notes |
|
Approved |
yes |
| Call Number |
|
Serial |
2096 |
| Permanent link to this record |
