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Ghislain Picard, Marion Leduc-Leballeur, Alison F. Banwell, Ludovic Brucker, Giovanni Macelloni |
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Title |
The sensitivity of satellite microwave observations to liquid water in the Antarctic snowpack |
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Year  |
2022 |
Publication |
The Cryosphere |
Abbreviated Journal |
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Volume |
16 |
Issue |
12 |
Pages |
5061-5083 |
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Surface melting on the Antarctic Ice Sheet has been monitored by satellite microwave radiometry for over 40 years. Despite this long perspective, our understanding of the microwave emission from wet snow is still limited, preventing the full exploitation of these observations to study supraglacial hydrology. Using the Snow Microwave Radiative Transfer (SMRT) model, this study investigates the sensitivity of microwave brightness temperature to snow liquid water content at frequencies from 1.4 to 37 GHz. We first determine the snowpack properties for eight selected coastal sites by retrieving profiles of density, grain size and ice layers from microwave observations when the snowpack is dry during wintertime. Second, a series of brightness temperature simulations is run with added water. The results show that (i) a small quantity of liquid water (≈0.5 kg m−2) can be detected, but the actual quantity cannot be retrieved out of the full range of possible water quantities; (ii) the detection of a buried wet layer is possible up to a maximum depth of 1 to 6 m depending on the frequency (6–37 GHz) and on the snow properties (grain size, density) at each site; (iii) surface ponds and water-saturated areas may prevent melt detection, but the current coverage of these waterbodies in the large satellite field of view is presently too small in Antarctica to have noticeable effects; and (iv) at 1.4 GHz, while the simulations are less reliable, we found a weaker sensitivity to liquid water and the maximal depth of detection is relatively shallow (<10 m) compared to the typical radiation penetration depth in dry firn (≈1000 m) at this low frequency. These numerical results pave the way for the development of improved multi-frequency algorithms to detect melt intensity and the depth of liquid water below the surface in the Antarctic snowpack. |
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1994-0416 |
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yes |
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8595 |
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Author |
Frédéric Barraquand, John-André Henden, Olivier Gilg, Rolf A. Ims, Nigel G. Yoccoz |
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Title |
The Traill island model for lemming dynamics, how it compares to Fennoscandian vole dynamics models, and a proposed simplification |
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Year |
2022 |
Publication |
Arxiv |
Abbreviated Journal |
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Volume |
2205.09441 |
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Keywords |
Quantitative Biology – Populations and Evolution |
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Abstract |
The Traill island model of Gilg et al. (2003) is a landmark attempt at mechanistic modelling of the cyclic population dynamics of rodents, focusing on a high Arctic community. It models the dynamics of one prey, the collared lemming, and four predators : the stoat, the Arctic fox, the long-tailed skua and the snowy owl. In the present short note, we first summarize how the model works in light of theory on seasonally forced predator-prey systems, with a focus on the temporal dynamics of predation rates. We show notably how the impact of generalist predation, which is able here to initiate population declines, differs slightly from that of generalist predation in other mechanistic models of rodent-mustelid interactions such as Turchin & Hanski (1997). We then provide a low-dimensional approximation with a single generalist predator compartment that mimics the essential features of the Traill island model: cycle periodicity, amplitude, shape, as well as generalist-induced declines. This simpler model should be broadly applicable to model other lemming populations that predominantly grow under the snow during the winter period. Matlab computer codes for Gilg et al. (2003), its two-dimensional approximation, as well as alternative lemming population dynamics models are provided. |
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1036 |
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yes |
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8596 |
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Ole Richter, David E. Gwyther, Benjamin K. Galton-Fenzi, Kaitlin A. Naughten |
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Title |
The Whole Antarctic Ocean Model (WAOM v1.0): development and evaluation |
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Year |
2022 |
Publication |
Geoscientific Model Development |
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Volume |
15 |
Issue |
2 |
Pages |
617-647 |
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Abstract |
The Regional Ocean Modeling System (ROMS), including an ice shelf component, has been applied on a circum-Antarctic domain to derive estimates of ice shelf basal melting. Significant improvements made compared to previous models of this scale are the inclusion of tides and a horizontal spatial resolution of 2 km, which is sufficient to resolve on-shelf heat transport by bathymetric troughs and eddy-scale circulation. We run the model with ocean–atmosphere–sea ice conditions from the year 2007 to represent nominal present-day climate. We force the ocean surface with buoyancy fluxes derived from sea ice concentration observations and wind stress from ERA-Interim atmospheric reanalysis. Boundary conditions are derived from the ECCO2 ocean state estimate; tides are incorporated as sea surface height and barotropic currents at the open boundary. We evaluate model results using satellite-derived estimates of ice shelf melting and established compilations of ocean hydrography. The Whole Antarctic Ocean Model (WAOM v1.0) qualitatively captures the broad scale difference between warm and cold regimes as well as many of the known characteristics of regional ice–ocean interaction. We identify a cold bias for some warm-water ice shelves and a lack of high-salinity shelf water (HSSW) formation. We conclude that further calibration and development of our approach are justified. At its current state, the model is ideal for addressing specific, process-oriented questions, e.g. related to tide-driven ice shelf melting at large scales. |
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688 |
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1991-959X |
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yes |
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8597 |
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Sydney Vach, Samuel N. Quinn, Andrew Vanderburg, Stephen R. Kane, Karen A. Collins, Adam L. Kraus, George Zhou, Amber A. Medina, Richard P. Schwarz, Kevin I. Collins, Dennis M. Conti, Chris Stockdale, Bob Massey, Olga Suarez, Tristan Guillot, Djamel Mekarnia, Lyu Abe, Georgina Dransfield, Nicolas Crouzet, Amaury H. M. J. Triaud, François-Xavier Schmider, Abelkrim Agabi, Marco Buttu, Coel Hellier, Elise Furlan, Crystal L. Gnilka, Steve B. Howell, Carl Ziegler, César Briceño, Nicholas Law, Andrew W. Mann, Alexander Rudat, Knicole D. Colon, Mark E. Rose, Michelle Kunimoto, Maximilian N. Günther, David Charbonneau, David R. Ciardi, George R. Ricker, Roland K. Vanderspek, David W. Latham, Sara Seager, Joshua N. Winn, Jon M. Jenkins |
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Title |
TOI-712: A System of Adolescent Mini-Neptunes Extending to the Habitable Zone |
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Journal |
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Year |
2022 |
Publication |
The Astronomical Journal |
Abbreviated Journal |
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Volume |
164 |
Issue |
2 |
Pages |
71 |
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Abstract |
As an all-sky survey, NASA’s Transiting Exoplanet Survey Satellite (TESS) mission is able to detect the brightest and rarest types of transiting planetary systems, including young planets that enable study of the evolutionary processes that occur within the first billion years. Here we report the discovery of a young, multiplanet system orbiting the bright K4.5V star, TOI-712 (V = 10.838, , R ⋆ = 0.674 ± 0.016 R ⊙, K). From the TESS light curve, we measure a rotation period of 12.48 days and derive an age between about 500 Myr and 1.1 Gyr. The photometric observations reveal three transiting mini-Neptunes (, , ), with orbital periods of P b = 9.531 days, P c = 51.699 days, and P d = 84.839 days. After modeling the three-planet system, an additional Earth-sized candidate is identified, TOI-712.05 (P = 4.32 days, R P = 0.81 ± 0.11 R ⊕). We calculate that the habitable zone falls between 0.339 and 0.844 au (82.7 and 325.3 days), placing TOI-712 d near its inner edge. Among planetary systems harboring temperate planets, TOI-712 (T = 9.9) stands out as a relatively young star bright enough to motivate further characterization. |
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1066 |
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1538-3881 |
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1538-3881 |
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yes |
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8598 |
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Jacqueline Oehri, Gabriela Schaepman-Strub, Jin-Soo Kim, Raleigh Grysko, Heather Kropp, Inge Grünberg, Vitalii Zemlianskii, Oliver Sonnentag, Eugénie S. Euskirchen, Merin Reji Chacko, Giovanni Muscari, Peter D. Blanken, Joshua F. Dean, Alcide di Sarra, Richard J. Harding, Ireneusz Sobota, Lars Kutzbach, Elena Plekhanova, Aku Riihelä, Julia Boike, Nathaniel B. Miller, Jason Beringer, Efrén López-Blanco, Paul C. Stoy, Ryan C. Sullivan, Marek Kejna, Frans-Jan W. Parmentier, John A. Gamon, Mikhail Mastepanov, Christian Wille, Marcin Jackowicz-Korczynski, Dirk N. Karger, William L. Quinton, Jaakko Putkonen, Dirk van As, Torben R. Christensen, Maria Z. Hakuba, Robert S. Stone, Stefan Metzger, Baptiste Vandecrux, Gerald V. Frost, Martin Wild, Birger Hansen, Daniela Meloni, Florent Domine, Mariska te Beest, Torsten Sachs, Aram Kalhori, Adrian V. Rocha, Scott N. Williamson, Sara Morris, Adam L. Atchley, Richard Essery, Benjamin R. K. Runkle, David Holl, Laura D. Riihimaki, Hiroki Iwata, Edward A. G. Schuur, Christopher J. Cox, Andrey A. Grachev, Joseph P. McFadden, Robert S. Fausto, Mathias Göckede, Masahito Ueyama, Norbert Pirk, Gijs de Boer, M. Syndonia Bret-Harte, Matti Leppäranta, Konrad Steffen, Thomas Friborg, Atsumu Ohmura, Colin W. Edgar, Johan Olofsson, Scott D. Chambers |
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Title |
Vegetation type is an important predictor of the arctic summer land surface energy budget |
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Journal |
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Year |
2022 |
Publication |
Nature Communications |
Abbreviated Journal |
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Volume |
13 |
Issue |
1 |
Pages |
6379 |
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Keywords |
Atmospheric dynamics Climate and Earth system modelling Cryospheric science Ecosystem ecology Phenology |
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Abstract |
Despite the importance of high-latitude surface energy budgets (SEBs) for land-climate interactions in the rapidly changing Arctic, uncertainties in their prediction persist. Here, we harmonize SEB observations across a network of vegetated and glaciated sites at circumpolar scale (1994–2021). Our variance-partitioning analysis identifies vegetation type as an important predictor for SEB-components during Arctic summer (June-August), compared to other SEB-drivers including climate, latitude and permafrost characteristics. Differences among vegetation types can be of similar magnitude as between vegetation and glacier surfaces and are especially high for summer sensible and latent heat fluxes. The timing of SEB-flux summer-regimes (when daily mean values exceed 0 Wm−2) relative to snow-free and -onset dates varies substantially depending on vegetation type, implying vegetation controls on snow-cover and SEB-flux seasonality. Our results indicate complex shifts in surface energy fluxes with land-cover transitions and a lengthening summer season, and highlight the potential for improving future Earth system models via a refined representation of Arctic vegetation types. |
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1042 |
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2041-1723 |
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yes |
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8599 |
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Jonathan Rae, Colin Forsyth, Malcolm Dunlop, Minna Palmroth, Mark Lester, Reiner Friedel, Geoff Reeves, Larry Kepko, Lucille Turc, Clare Watt, Wojciech Hajdas, Theodoros Sarris, Yoshifumi Saito, Ondrej Santolik, Yuri Shprits, Chi Wang, Aurelie Marchaudon, Matthieu Berthomier, Octav Marghitu, Benoit Hubert, Martin Volwerk, Elena A. Kronberg, Ian Mann, Kyle Murphy, David Miles, Zhonghua Yao, Andrew Fazakerley, Jasmine Sandhu, Hayley Allison, Quanqi Shi |
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Title |
What are the fundamental modes of energy transfer and partitioning in the coupled Magnetosphere-Ionosphere system? |
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Journal |
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Year |
2022 |
Publication |
Experimental Astronomy |
Abbreviated Journal |
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Volume |
54 |
Issue |
2 |
Pages |
391-426 |
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Keywords |
Earth Magnetosphere-Ionosphere coupling Space missions Voyage 2050 |
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Abstract |
The fundamental processes responsible for energy exchange between large-scale electromagnetic fields and plasma are well understood theoretically, but in practice these theories have not been tested. These processes are ubiquitous in all plasmas, especially at the interface between high and low beta plasmas in planetary magnetospheres and other magnetic environments. Although such boundaries pervade the plasma Universe, the processes responsible for the release of the stored magnetic and thermal plasma energy have not been fully identified and the importance of the relative impact of each process is unknown. Despite advances in understanding energy release through the conversion of magnetic to kinetic energy in magnetic reconnection, how the extreme pressures in the regions between stretched and more relaxed field lines in the transition region are balanced and released through adiabatic convection of plasma and fields is still a mystery. Recent theoretical advances and the predictions of large-scale instabilities must be tested. In essence, the processes responsible remain poorly understood and the problem unresolved. The aim of the White Paper submitted to ESA’s Voyage 2050 call, and the contents of this paper, is to highlight three outstanding open science questions that are of clear international interest: (i) the interplay of local and global plasma physics processes: (ii) the partitioning during energy conversion between electromagnetic and plasma energy: and (iii) what processes drive the coupling between low and high beta plasmas. We present a discussion of the new measurements and technological advances required from current state-of-the-art, and several candidate mission profiles with which these international high-priority science goals could be significantly advanced. |
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312 |
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1572-9508 |
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yes |
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Serial |
8600 |
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Author |
Stéphanie Jenouvrier, Lise Aubry, Silke van Daalen, Christophe Barbraud, Henri Weimerskirch, Hal Caswell |
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Title |
When the going gets tough, the tough get going: Effect of extreme climate on an Antarctic seabird's life history |
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Journal |
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Year |
2022 |
Publication |
Ecology Letters |
Abbreviated Journal |
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Volume |
25 |
Issue |
10 |
Pages |
2120-2131 |
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Keywords |
fixed heterogeneity frailty individual quality individual stochasticity SICs unobserved individual heterogeneity |
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Abstract |
Individuals differ in many ways. Most produce few offspring; a handful produce many. Some die early; others live to old age. It is tempting to attribute these differences in outcomes to differences in individual traits, and thus in the demographic rates experienced. However, there is more to individual variation than meets the eye of the biologist. Even among individuals sharing identical traits, life history outcomes (life expectancy and lifetime reproduction) will vary due to individual stochasticity, that is to chance. Quantifying the contributions of heterogeneity and chance is essential to understand natural variability. Interindividual differences vary across environmental conditions, hence heterogeneity and stochasticity depend on environmental conditions. We show that favourable conditions increase the contributions of individual stochasticity, and reduce the contributions of heterogeneity, to variance in demographic outcomes in a seabird population. The opposite is true under poor conditions. This result has important consequence for understanding the ecology and evolution of life history strategies. |
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109 |
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1461-0248 |
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yes |
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8601 |
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Author |
Samara Danel, Nancy Rebout, Francesco Bonadonna, Dora Biro |
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Title |
Wild skuas can follow human-given behavioural cues when objects resemble natural food |
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Journal |
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Year |
2022 |
Publication |
Animal Cognition |
Abbreviated Journal |
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Volume |
26 |
Issue |
2 |
Pages |
709-713 |
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Keywords |
Choice task Human–animal communication Neophobia Skua Social cue Social learning |
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Abstract |
The capacity to follow human cues provides animals with information about the environment and can hence offer obvious adaptive benefits. Most studies carried out so far, however, have been on captive animals with previous experience with humans. Further comparative investigation is needed to properly assess the factors driving the emergence of this capacity under natural conditions, especially in species that do not have longstanding interactions with humans. Wild brown skuas (Catharacta antarctica ssp. lonnbergi) are non-neophobic seabirds that live in human-free habitats. In test 1, we assessed this species’ capacity to use human behavioural cues (i.e., pecking at the same object previously picked up and lifted by a human experimenter) when the items presented were food objects: anthropogenic objects (wrapped muffins) and natural-food-resembling objects (plaster eggs). In test 2, we examined the response of another skua population towards non-food objects (sponges). Although all skuas in test 1 pecked at the objects, they pecked significantly more at the same previously handled items when they resembled natural food (plaster eggs). Most skuas in test 2, however, did not approach or peck at the non-food objects presented. Our results lead us to suggest that the use of human behavioural cues may be influenced by skuas’ foraging ecology, which paves the way to further field studies assessing whether this capacity is directed specifically towards food objects and/or develops after previous interaction with humans. |
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354 |
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ISSN |
1435-9456 |
ISBN |
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yes |
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Serial |
8602 |
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Author |
Charlène Guillaumot, Jonathan Belmaker, Yehezkel Buba, Damien Fourcy, Philippe Dubois, Bruno Danis, Eline Le Moan, Thomas Saucède |
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Title |
Classic or hybrid? The performance of next generation ecological models to study the response of Southern Ocean species to changing environmental conditions |
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Year |
2022 |
Publication |
Diversity and Distributions |
Abbreviated Journal |
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Volume |
28 |
Issue |
11 |
Pages |
2286-2302 |
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Keywords |
Bayesian inference data-poor systems integrated approaches Kerguelen Islands sea urchin species distribution modelling |
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Abstract |
Aim In the context of intensifying threats of climate change on marine communities, ecological models are widely applied for conservation strategies, though polar studies remain scarce given the limited number of datasets available. Correlative (e.g. species distribution models, SDM) and mechanistic (e.g. dynamic energy budget models, DEB) modelling approaches are usually used independently in studies. Using both approaches in integrative, hybrid models could help to better estimate the species potential ecological niche, as mechanistic and correlative models complement each other very well, giving more insights into species potential response to fast-changing environmental conditions. Location The study focusses on the Baie du Morbihan, a silled basin located in the east of the Kerguelen Islands (sub-Antarctic). Methods A hybrid, correlative-mechanistic model was implemented to predict the response of the endemic sea urchin Abatus cordatus (Verrill, 1876). We compared the performances of classic and integrated approaches to predict A. cordatus distribution according to two dates representing seasonal contrasts. Two integrated approaches were studied and performed by either (1) including the spatial projection of the DEB model as an input layer inside the SDM (‘integrated SDM-DEB’) or (2) using a Bayesian procedure to use DEB model outputs as priors of the SDM (‘integrated Bayesian’ approach). Results Results show higher performances of ‘integrated Bayesian’ approaches to evaluate A. cordatus potential ecological niche compared with ‘classic’ and ‘integrated SDM-DEB’ methods. The influence of environmental conditions on model predictions is further captured with these Bayesian procedures and better highlights the environmental influence on the species-predicted distribution. Model performance is good for the different simulations, and uncertainty in predictions is well-highlighted. Main conclusions The good performances of ‘integrated Bayesian’ approaches to estimate species potential ecological niche opens perspectives for future applications to a broad panel of natural examples, noteworthy for decision-making and conservation management purposes. |
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688,1044 |
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Thesis |
Bachelor's thesis |
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1472-4642 |
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yes |
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Call Number |
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Serial |
8316 |
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Author |
Gilg, O., Hansen, L.H., Schmidt, N.M., Lang, J., Sittler, B., Sokolov, A., Sokolova, N., Fufachev, I., Ehrich, D., Forin-Wiart, M.-A., Bédard, A., Lecomte, N., Sabard, B., Pletenev, A., Gilg, V., Sabard, C., Meyer, N., Berteaux, D. & Bollache, L. |
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Title |
Predator-prey interactions between the arctic fox and tundra nesting birds in space and time: first results of an ongoing circumpolar initiative |
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Peer-reviewed symposium |
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Year |
2022 |
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6th international conference in Arctic Fox Conference 2022, 26-29 August 2022, Longyearbyen, Svalbard |
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1036 |
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yes |
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8658 |
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