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Title |
Weak effects of geolocators on small birds: A meta-analysis controlled for phylogeny and publication bias |
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Year |
2020 |
Publication |
Journal of Animal Ecology |
Abbreviated Journal |
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Volume  |
89 |
Issue |
1 |
Pages |
207-220 |
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Keywords |
condition migration phenology reproduction return rate survival tag effect tracking device |
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Abstract |
Currently, the deployment of tracking devices is one of the most frequently used approaches to study movement ecology of birds. Recent miniaturization of light-level geolocators enabled studying small bird species whose migratory patterns were widely unknown. However, geolocators may reduce vital rates in tagged birds and may bias obtained movement data. There is a need for a thorough assessment of the potential tag effects on small birds, as previous meta-analyses did not evaluate unpublished data and impact of multiple life-history traits, focused mainly on large species and the number of published studies tagging small birds has increased substantially. We quantitatively reviewed 549 records extracted from 74 published and 48 unpublished studies on over 7,800 tagged and 17,800 control individuals to examine the effects of geolocator tagging on small bird species (body mass <100 g). We calculated the effect of tagging on apparent survival, condition, phenology and breeding performance and identified the most important predictors of the magnitude of effect sizes. Even though the effects were not statistically significant in phylogenetically controlled models, we found a weak negative impact of geolocators on apparent survival. The negative effect on apparent survival was stronger with increasing relative load of the device and with geolocators attached using elastic harnesses. Moreover, tagging effects were stronger in smaller species. In conclusion, we found a weak effect on apparent survival of tagged birds and managed to pinpoint key aspects and drivers of tagging effects. We provide recommendations for establishing matched control group for proper effect size assessment in future studies and outline various aspects of tagging that need further investigation. Finally, our results encourage further use of geolocators on small bird species but the ethical aspects and scientific benefits should always be considered. |
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1365-2656 |
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yes |
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7670 |
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Title |
Using Component Ratios to Detect Metadata and Instrument Problems of Seismic Stations: Examples from 18 Yr of GEOSCOPE Data |
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Year |
2020 |
Publication |
Seismological research letters |
Abbreviated Journal |
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Volume |
91 |
Issue |
1 |
Pages |
272-286 |
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133 |
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yes |
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7672 |
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Title |
The Paris Agreement objectives will likely halt future declines of emperor penguins |
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Year |
2020 |
Publication |
Global Change Biology |
Abbreviated Journal |
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Volume |
26 |
Issue |
3 |
Pages |
1170-1184 |
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Keywords |
Antarctica climate change mitigation dispersion emission reduction pledges seabirds |
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109 |
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1365-2486 |
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yes |
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7675 |
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Master 2 |
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2020 |
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48 pp |
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1044 |
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yes |
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Serial |
8060 |
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Author |
Meudec L. |
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Master 1 |
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Year |
2020 |
Publication |
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Abbreviated Journal |
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Volume |
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Pages |
13 pp |
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1044 |
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yes |
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Serial |
8061 |
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Author |
Natacha Garcin |
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Title |
The effects of stress hormones on king penguin's growth, energetics and ageing rate |
Type |
Master 2 |
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Year |
2020 |
Publication |
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Abbreviated Journal |
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Volume |
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Issue |
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Pages |
35 |
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Keywords |
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Abstract |
Stress exposure and stress response are likely to vary according to life history strategies and across environmental contexts. If the release of glucocorticoids (e.g. corticosterone, CORT) in response to acute stress enables animals to rightfully cope with the situation, chronic exposure to high CORT levels can lead to deleterious cascading effects on animal’s physiology, behavior and fitness. Some species may be more adapted to cope with stressful events than others and might exhibit natural adaptations to limit the adverse consequences of prolonged high CORT levels. The aim of this study was to investigate the effects of experimentally elevated CORT levels on the growth, energetics and ageing of king penguin chicks (Aptenodytes patagonicus), using sub-cutaneous CORT implants. We investigated the effects of CORT both on the medium (23 days
after implant) and the long-term (fledging: ~ 200 days after the implant) on morphological (i.e. body mass and size), behavioral (i.e. aggressivity, physical activity) and physiological traits (i.e. heart rate, CORT response to acute stress, oxidative stress, mitochondrial density and telomere length). Although CORT-treated chicks were taller, more aggressive and displayed lower CORT response to acute stress on the medium-term, there was no significant impact of CORT on the body mass and whole-body energetics assessed through heart rate and physical activity. Moreover, CORT chicks displayed lower oxidized glutathione on the medium and long-term, thus indirectly preventing
oxidative damage, while telomere length and mitochondrial density were not influenced by CORT implants. Although chronic elevation of glucocorticoid levels is mostly known to result in negative physiological and behavioral outcomes, our results indicating some positive effects of CORT implants are consistent with the hypothesis that species who encounter several noxious stressors in their environment, could be naturally adapted to cope with them. The growth-enhancing effect of CORT might be mediated by a higher efficiency at which food is assimilated and/or used, and CORT chicks might benefit from aggressive behaviors during competitive interactions or predation
encounters. Through the antioxidant glutathione system, CORT treated chicks seem to have developed a resistance to oxidative stress that could last over time (i.e. possibly through a reduction
of ROS production). While CORT implants did not accelerate ageing or bring short and mediumterm costs, possible long lasting programming effects of CORT should be further investigated. |
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119 |
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yes |
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Call Number |
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Serial |
8101 |
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Title |
Global Carbon Budget 2020 |
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Journal |
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Year |
2020 |
Publication |
Earth System Science Data |
Abbreviated Journal |
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Volume |
12 |
Issue |
4 |
Pages |
3269-3340 |
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416 |
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ISSN |
1866-3508 |
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yes |
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Call Number |
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Serial |
7677 |
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Author |
C. Michelot, A. Kato, T. Raclot, K. Shiomi, P. Goulet, P. Bustamante, Y. Ropert-Coudert |
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Year |
2020 |
Publication |
Marine Ecology Progress Series |
Abbreviated Journal |
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Volume |
640 |
Issue |
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Pages |
215-230 |
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Keywords |
Colony Diet GPS Incubation trip Pygoscelis adeliae Sea-ice edge Stable isotopes |
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Abstract |
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Programme |
1091 |
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ISSN |
0171-8630, 1616-1599 |
ISBN |
0171-8630, 1616-1599 |
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yes |
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Serial |
7680 |
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Author |
David Boertmann, Flemming Merkel, Olivier Gilg |
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Title |
Seabird Breeding Colonies in East and North Greenland: A Baseline |
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Year |
2020 |
Publication |
ARCTIC |
Abbreviated Journal |
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Volume |
73 |
Issue |
1 |
Pages |
20-39 |
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Keywords |
climate change colonial seabirds distribution Greenland |
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Abstract |
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Programme |
1036 |
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ISSN |
1923-1245 |
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yes |
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Call Number |
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Serial |
7681 |
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Author |
David T. Iles, Heather Lynch, Rubao Ji, Christophe Barbraud, Karine Delord, Stephanie Jenouvrier |
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Title |
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Journal |
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Year |
2020 |
Publication |
Global Change Biology |
Abbreviated Journal |
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Volume |
26 |
Issue |
7 |
Pages |
3788-3798 |
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Keywords |
Antarctica environmental variation habitat suitability niche predictability state-space stochastic uncertainty |
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Abstract |
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Programme |
109 |
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1365-2486 |
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yes |
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7682 |
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