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| Author | Mathurin Dongmo Wamba, Jean-Paul Montagner, Barbara Romanowicz | ||||
| Title | Imaging deep-mantle plumbing beneath La Réunion and Comores hot spots: Vertical plume conduits and horizontal ponding zones | Type | Journal | ||
| Year | 2023 | Publication | Science Advances | Abbreviated Journal | |
| Volume | 9 | Issue | 4 | Pages | eade3723 |
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| Abstract | Whether the two large low–shear velocity provinces (LLSVPs) at the base of Earth’s mantle are wide compact structures extending thousands of kilometers upward or bundles of distinct mantle plumes is the subject of debate. Full waveform shear wave tomography of the deep mantle beneath the Indian Ocean highlights the presence of several separate broad low-velocity conduits anchored at the core-mantle boundary in the eastern part of the African LLSVP, most clearly beneath La Réunion and Comores hot spots. The deep plumbing system beneath these hot spots may also include alternating vertical conduits and horizontal ponding zones, from 1000-km depth to the top of the asthenosphere, reminiscent of dyke and sills in crustal volcanic systems, albeit at a whole-mantle scale. | ||||
| Programme | 133 | ||||
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| Notes | Approved | yes | |||
| Call Number | Serial  |
8631 | |||
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| Author | Timothée Zidat, Marianne Gabirot, Francesco Bonadonna, Carsten T. Müller | ||||
| Title | Homing and Nest Recognition in Nocturnal Blue Petrels: What Scent May Attract Birds to their Burrows? | Type | Journal | ||
| Year | 2023 | Publication | Journal of Chemical Ecology | Abbreviated Journal | |
| Volume | Issue | Pages | |||
| Keywords | Homing Behavior Nest Air Odor Olfaction Orientation Procellariform Seabirds TD-GC-TOF-MS | ||||
| Abstract | Hypogean petrels return to the same nest burrow to breed on remote islands during the summer months. Their nocturnal behavior at the colony, strong musky odor and olfactory anatomy suggest an important role of olfaction in homing behavior and nest recognition. Behavioral experiments showed that olfactory cues are sufficient to allow nest identification, suggesting a stabile chemical signature emanating from burrows and facilitating nest recognition. However, the chemical nature and sources of this odor remain unknown. To better understand the nest odor composition, we analyzed volatile organic compounds (VOCs) of nests of blue petrels (Halobaena caerulea) derived from three different odor sources: nest air, nest material and feather samples. We also compared, during two successive years, VOCs from burrows with an incubating breeder on the nest, and burrows used during the breeding season by blue petrels but shortly temporally unoccupied by breeders. We found that the nest air odor was mainly formed by the owners’ odor, which provided an individual chemical label for nests that appeared stabile over the breeding season. These findings, together with the previous homing behavioral studies showing an essential role of the sense of smell in blue petrels, strongly suggest that the scent emanating from burrows of blue petrels provides the information that facilitates nest recognition and homing. | ||||
| Programme | 354 | ||||
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| Series Volume | Series Issue | Edition | |||
| ISSN | 1573-1561 | ISBN | Medium | ||
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| Notes | Approved | yes | |||
| Call Number | Serial |
8630 | |||
| Permanent link to this record | |||||
| Author | Christophe Leroy-Dos Santos, Elise Fourré, Cécile Agosta, Mathieu Casado, Alexandre Cauquoin, Martin Werner, Benedicte Minster, Frederic Prié, Olivier Jossoud, Leila Petit, Amaëlle Landais | ||||
| Title | From atmospheric water isotopes measurement to firn core interpretation in Adelie Land: A case study for isotope-enabled atmospheric models in Antarctica | Type | Journal | ||
| Year | 2023 | Publication | EGUsphere | Abbreviated Journal | |
| Volume | Issue | Pages | 1-20 | ||
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| Abstract | Abstract. In a context of global warming and sea level rise acceleration, it is key to estimate the evolution of the atmospheric hydrological cycle and temperature in the polar regions, which directly influence the surface mass balance of the Arctic and Antarctic ice sheets. Direct observations are available from satellite data for the last 40 years and a few weather data since the 50’s in Antarctica. One of the best ways to access longer records is to use climate proxies in firn or ice cores. The water isotopic composition in these cores is widely used to reconstruct past temperature variations. In order to progress in our understanding of the influence of the atmospheric hydrological cycle on the water isotopic composition, we first present a 2-year long time series of vapor and precipitation isotopic composition measurement at Dumont d’Urville station, in Adélie Land. We characterize diurnal variations of meteorological parameters (temperature, humidity and δ18O) for the different seasons and to determine the evolution of key relationships (δ18O versus temperature or humidity) along the year: we found mean annual slopes of 0.5 and 0.4 ‰ °C−1 for the relationship of δ18O vs. temperature in the water vapor and in the precipitation respectively. Then, this data set is used to evaluate the Atmospheric General Circulation Model ECHAM6-wiso (model version with embedded water stable isotopes) in a region where local conditions are controlled by strong katabatic winds which directly impact the isotopic signal. We show that a combination of continental (79 %) and oceanic (21 %) grid cells leads model outputs (temperature, humidity and δ18O) to nicely fit the observations, even winter extreme synoptic events are represented in the model. Therefore we demonstrate the added value of long-term water vapor isotopic composition records. Then, as a clear link is found between water vapor and precipitation isotopic composition, we evaluate how isotopic enabled models can help interpreting short firn cores. |
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| Programme | 1110 | ||||
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| Notes | Approved | yes | |||
| Call Number | Serial |
8629 | |||
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| Author | David Grémillet, Sébastien Descamps | ||||
| Title | Ecological impacts of climate change on Arctic marine megafauna | Type | Journal | ||
| Year | 2023 | Publication | Trends in Ecology & Evolution | Abbreviated Journal | |
| Volume | 38 | Issue | 8 | Pages | 773-783 |
| Keywords | biogeography citizen science global change long-term monitoring oceanography polar | ||||
| Abstract | Global warming affects the Arctic more than any other region. Mass media constantly relay apocalyptic visions of climate change threatening Arctic wildlife, especially emblematic megafauna such as polar bears, whales, and seabirds. Yet, we are just beginning to understand such ecological impacts on marine megafauna at the scale of the Arctic. This knowledge is geographically and taxonomically biased, with striking deficiencies in the Russian Arctic and strong focus on exploited species such as cod. Beyond a synthesis of scientific advances in the past 5 years, we provide ten key questions to be addressed by future work and outline the requested methodology. This framework builds upon long-term Arctic monitoring inclusive of local communities whilst capitalising on high-tech and big data approaches. | ||||
| Programme | 388 | ||||
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| Series Volume | Series Issue | Edition | |||
| ISSN | 0169-5347 | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Notes | Approved | yes | |||
| Call Number | Serial |
8628 | |||
| Permanent link to this record | |||||
| Author | Sara Arioli, Ghislain Picard, Laurent Arnaud, Vincent Favier | ||||
| Title | Dynamics of the snow grain size in a windy coastal area of Antarctica from continuous in situ spectral-albedo measurements | Type | Journal | ||
| Year | 2023 | Publication | The Cryosphere | Abbreviated Journal | |
| Volume | 17 | Issue | 6 | Pages | 2323-2342 |
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| Abstract | The grain size of the superficial snow layer is a key determinant of the surface albedo in Antarctica. Its evolution is the result of multiple interacting processes, such as dry and wet metamorphism, melt, snow drift, and precipitation. Among them, snow drift has the least known and least predictable impact. The goal of this study is to relate the variations in surface snow grain size to these processes in a windy location of the Antarctic coast. For this, we retrieved the daily grain size from 5-year-long in situ observations of the spectral albedo recorded by a new multi-band albedometer, unique in terms of autonomy and described here for the first time. An uncertainty assessment and a comparison with satellite-retrieved grain size were carried out to verify the reliability of the instrument, and an RMSE up to 0.16 mm in the observed grain size was found. By relating these in situ measurements to time series of snow drift, surface temperature, snow surface height and snowfall, we established that the evolution of the grain size in the presence of snow drift is complex and follows two possible pathways: (1) a decrease in the grain size (about half of our measurements) resulting from the deposition of small grains advected by the wind (surprisingly, this decrease is often – 2/3 of the cases– associated with a decrease in the surface height, i.e., a net erosion over the drift episode), (2) an increase in the grain size (the other half) due to either the removal of the surface layer or metamorphism. However, we note that this increase is often limited with respect to the increase predicted by a theoretical metamorphism model, suggesting that a concomitant deposition of small grains is likely. At last, we found that wind also completely impedes the deposition of snowfall during half of the observed precipitation events. When this happens, the grain size evolves as if precipitation were not occurring. As a result of all these processes, we conclude that the grain size in a windy area remains more stable than it would be in the absence of snow drift, hence limiting the variations in the albedo and in the radiative energy budget. | ||||
| Programme | 1110 | ||||
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| ISSN | 1994-0416 | ISBN | Medium | ||
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| Notes | Approved | yes | |||
| Call Number | Serial |
8627 | |||
| Permanent link to this record | |||||
| Author | Christophe Sauser, Karine Delord, Christophe Barbraud | ||||
| Title | Demography of cape petrels in response to environmental changes | Type | Journal | ||
| Year | 2023 | Publication | Population Ecology | Abbreviated Journal | |
| Volume | 65 | Issue | 1 | Pages | 25-37 |
| Keywords | cape petrel capture–mark–recapture population dynamics sea surface temperature southern annular mode | ||||
| Abstract | Predicting the responses of populations in changing environments is an important task for ecologists. Understanding the population dynamics of high-latitude breeding species is critical given the particularly rapid environmental changes that occur in these regions. Using long-term mark–resighting data acquired over 53-years in Pointe Géologie, Terre Adélie, Antarctica, we estimated age-specific demographic parameters and evaluated the effect of the environment on survival of a poorly known species, the cape petrel Daption capense. We then modeled the dynamics of this population using a life-history model and performed prospective and retrospective analyses to estimate the sensitivity of the population growth rate to demographic parameters, and to quantify their relative contribution. Survival of cape petrel increased with age, being 0.610 (±0.193) for juveniles, 0.739 (±0.158) for individuals from 2 to 4, and 0.920 (±0.031) for older individuals. Minimum age at first reproduction was 3 years old, the age at which all birds were recruited was 14 years, and mean age at first reproduction was 9.05 (±2.06) years. Adult survival increased over time and was positively correlated with the southern annular mode (SAM). The stochastic population growth rate was estimated at 1.019, and adult survival over age 5 made the largest contribution to variance of the population growth rate. Sensitivity analyses revealed that population regulation was mainly driven by the SAM. Our results suggest that despite the decrease in breeding success, the population of cape petrels at Pointe Géologie increased due to the increase in immature and adult survival. | ||||
| Programme | 109 | ||||
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| Series Volume | Series Issue | Edition | |||
| ISSN | 1438-390X | ISBN | Medium | ||
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| Notes | Approved | yes | |||
| Call Number | Serial |
8626 | |||
| Permanent link to this record | |||||
| Author | Andrea S. Grunst, Melissa L. Grunst, Jérôme Fort | ||||
| Title | Contaminant-by-environment interactive effects on animal behavior in the context of global change: Evidence from avian behavioral ecotoxicology | Type | Journal | ||
| Year | 2023 | Publication | Science of The Total Environment | Abbreviated Journal | |
| Volume | 879 | Issue | Pages | 163169 | |
| Keywords | Behavioral ecotoxicology Behavioral plasticity Behavioral reaction norms Chemical contaminants Interactive effects Multiple stressors | ||||
| Abstract | The potential for chemical contaminant exposure to interact with other stressors to affect animal behavioral responses to environmental variability is of mounting concern in the context of anthropogenic environmental change. We systematically reviewed the avian literature to evaluate evidence for contaminant-by-environment interactive effects on animal behavior, as birds are prominent models in behavioral ecotoxicology and global change research. We found that only 17 of 156 (10.9 %) avian behavioral ecotoxicological studies have explored contaminant-by-environment interactions. However, 13 (76.5 %) have found evidence for interactive effects, suggesting that contaminant-by-environment interactive effects on behavior are understudied but important. We draw on our review to develop a conceptual framework to understand such interactive effects from a behavioral reaction norm perspective. Our framework highlights four patterns in reaction norm shapes that can underlie contaminant-by-environment interactive effects on behavior, termed exacerbation, inhibition, mitigation and convergence. First, contamination can render individuals unable to maintain critical behaviors across gradients in additional stressors, exacerbating behavioral change (reaction norms steeper) and generating synergy. Second, contamination can inhibit behavioral adjustment to other stressors, antagonizing behavioral plasticity (reaction norms shallower). Third, a second stressor can mitigate (antagonize) toxicological effects of contamination, causing steeper reaction norms in highly contaminated individuals, with improvement of performance upon exposure to additional stress. Fourth, contamination can limit behavioral plasticity in response to permissive conditions, such that performance of more and less contaminated individuals converges under more stressful conditions. Diverse mechanisms might underlie such shape differences in reaction norms, including combined effects of contaminants and other stressors on endocrinology, energy balance, sensory systems, and physiological and cognitive limits. To encourage more research, we outline how the types of contaminant-by-environment interactive effects proposed in our framework might operate across multiple behavioral domains. We conclude by leveraging our review and framework to suggest priorities for future research. | ||||
| Programme | 388 | ||||
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| Series Volume | Series Issue | Edition | |||
| ISSN | 0048-9697 | ISBN | Medium | ||
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| Notes | Approved | yes | |||
| Call Number | Serial |
8625 | |||
| Permanent link to this record | |||||
| Author | Richard A. Phillips, Jérôme Fort, Maria P. Dias | ||||
| Title | Chapter 2 – Conservation status and overview of threats to seabirds | Type | Book | ||
| Year | 2023 | Publication | Conservation of Marine Birds | Abbreviated Journal | |
| Volume | Issue | Conservation of Marine Birds | Pages | 33-56 | |
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| Abstract | Seabirds are among the most threatened of all vertebrate groups. Here we review their conservation status and key aspects of the main threats and some emerging threats. Bycatch in fisheries and overfishing are pervasive, but potentially soluble with improved governance. Invasive alien species at breeding sites remain a major threat despite notable recent successes in eradication campaigns. Changing climatic conditions continue to have multiple, increasing, direct and indirect effects on seabirds. The full impacts of disease and chemical pollution are less clear because effects may be sublethal. Impacts of other anthropogenic processes that currently concern relatively few species are probably increasing. As seabird populations are affected by multiple threats that may be additive or synergistic, addressing population declines will often require a suite of management measures and potentially compensatory mitigation for climate change. | ||||
| Programme | 388 | ||||
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| ISSN | ISBN | 978-0-323-88539-3 | Medium | ||
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| Notes | Approved | yes | |||
| Call Number | Serial |
8624 | |||
| Permanent link to this record | |||||
| Author | Amro Hashish, Timothy J. Johnson, Dhiraj Chundru, Michele L. Williams, Yuko Sato, Nubia R. Macedo, Augustin Clessin, Hubert Gantelet, Caroline Bost, Jérémy Tornos, Amandine Gamble, Karen J. LeCount, Mostafa Ghanem, Thierry Boulinier, Mohamed El-Gazzar | ||||
| Title | Complete Genome Sequences of Two Pasteurella multocida Isolates from Seabirds | Type | Journal | ||
| Year | 2023 | Publication | Microbiology Resource Announcements | Abbreviated Journal | |
| Volume | 12 | Issue | 4 | Pages | e01365-22 |
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| Abstract | Pasteurella multocida is one of the major causes of mass mortalities in wild birds. Here, we report the complete genome sequences of two P. multocida isolates from wild populations of two endangered seabird species, the Indian yellow-nosed albatrosses (Thalassarche carteri) and the northern rockhopper penguins (Eudyptes moseleyi). | ||||
| Programme | 1151 | ||||
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| Series Volume | Series Issue | Edition | |||
| ISSN | 2576-098X | ISBN | Medium | ||
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| Notes | Approved | yes | |||
| Call Number | Serial |
8623 | |||
| Permanent link to this record | |||||
| Author | Melissa L. Grunst, Andrea S. Grunst, David Grémillet, Jérôme Fort | ||||
| Title | Combined threats of climate change and contaminant exposure through the lens of bioenergetics | Type | Journal | ||
| Year | 2023 | Publication | Global Change Biology | Abbreviated Journal | |
| Volume | 29 | Issue | 18 | Pages | 5139-5168 |
| Keywords | bioenergetics chemical contaminants climate change energy balance interactive effects physiological acclimatization plasticity temperature | ||||
| Abstract | Organisms face energetic challenges of climate change in combination with suites of natural and anthropogenic stressors. In particular, chemical contaminant exposure has neurotoxic, endocrine-disrupting, and behavioral effects which may additively or interactively combine with challenges associated with climate change. We used a literature review across animal taxa and contaminant classes, but focused on Arctic endotherms and contaminants important in Arctic ecosystems, to demonstrate potential for interactive effects across five bioenergetic domains: (1) energy supply, (2) energy demand, (3) energy storage, (4) energy allocation tradeoffs, and (5) energy management strategies; and involving four climate change-sensitive environmental stressors: changes in resource availability, temperature, predation risk, and parasitism. Identified examples included relatively equal numbers of synergistic and antagonistic interactions. Synergies are often suggested to be particularly problematic, since they magnify biological effects. However, we emphasize that antagonistic effects on bioenergetic traits can be equally problematic, since they can reflect dampening of beneficial responses and result in negative synergistic effects on fitness. Our review also highlights that empirical demonstrations remain limited, especially in endotherms. Elucidating the nature of climate change-by-contaminant interactive effects on bioenergetic traits will build toward determining overall outcomes for energy balance and fitness. Progressing to determine critical species, life stages, and target areas in which transformative effects arise will aid in forecasting broad-scale bioenergetic outcomes under global change scenarios. | ||||
| Programme | 388 | ||||
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| ISSN | 1365-2486 | ISBN | 1365-2486 | Medium | |
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| Notes | Approved | yes | |||
| Call Number | Serial |
8622 | |||
| Permanent link to this record | |||||