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Auteur Fablet, R.; Chaigneau, A.; Bertrand, S.
Titre Multiscale analysis of geometric planar deformations : application to wild animal electronic tracking and satellite ocean observation data Type Article scientifique
Année 2014 Publication Revue Abrégée Ieee Transactions on Geoscience and Remote Sensing
Volume 52 Numéro 6 Pages 3627-3636
Mots-Clés Animal movements; geophysical fields; multiscale geometry; planar curve; trajectory analysis; wavelet analysis
Résumé The development of animal tracking technologies (including GPS and ARGOS satellite systems) and the increasing resolution of remote-sensing observations call for tools extracting and describing the geometric patterns along a track or within an image over a wide range of spatial scales. Whereas shape analysis has largely been addressed over the last decades, the multiscale analysis of the geometry of opened planar curves has received little attention. We here show that classical multiscale techniques cannot properly address this issue and propose an original wavelet-based scheme. To highlight the generic nature of our multiscale wavelet technique, we report applications to two different observation data sets, namely, wild animal movement paths recorded by electronic tags and satellite observations of sea-surface geophysical fields.
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ISSN 0196-2892 ISBN Médium
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Numéro d'Appel LL @ pixluser @ collection 328
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Auteur Krause, J.; Herbert-Read, J.E.; Seebacher, F.; Domenici, P.; Wilson, A.D.M.; Marras, S.; Svendsen, M.B.S.; Strombom, D.; Steffensen, J.F.; Krause, S.; Viblanc, P.E.; Couillaud, P.; Bach, P.; Sabarros, P.S.; Zaslansky, P.; Kurvers, R.H.J.M.
Titre Injury-mediated decrease in locomotor performance increases predation risk in schooling fish Type Article scientifique
Année 2017 Publication Revue Abrégée Philos. Trans. R. Soc. B-Biol. Sci.
Volume 372 Numéro 1727 Pages 20160232
Mots-Clés animal groups; Behavior; danger; fish schools; geometry; group-living; killer whales; locomotion; organization; Predation; prey interactions; selfish herd; spatial position; spatial positions; vertebrates
Résumé The costs and benefits of group living often depend on the spatial position of individuals within groups and the ability of individuals to occupy preferred positions. For example, models of predation events for moving prey groups predict higher mortality risk for individuals at the periphery and front of groups. We investigated these predictions in sardine (Sardinella aurita) schools under attack from group hunting sailfish (Istiophorus platypterus) in the open ocean. Sailfish approached sardine schools about equally often from the front and rear, but prior to attack there was a chasing period in which sardines attempted to swim away from the predator. Consequently, all sailfish attacks were directed at the rear and peripheral positions of the school, resulting in higher predation risk for individuals at these positions. During attacks, sailfish slash at sardines with their bill causing prey injury including scale removal and tissue damage. Sardines injured in previous attacks were more often found in the rear half of the school than in the front half. Moreover, injured fish had lower tail-beat frequencies and lagged behind uninjured fish. Injuries inflicted by sailfish bills may, therefore, hinder prey swimming speed and drive spatial sorting in prey schools through passive self-assortment. We found only partial support for the theoretical predictions from current predator-prey models, highlighting the importance of incorporating more realistic predator-prey dynamics into these models. This article is part of the themed issue 'Physiological determinants of social behaviour in animals'.
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Langue English Langue du Résumé Titre Original
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ISSN 0962-8436 ISBN Médium
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Numéro d'Appel MARBEC @ isabelle.vidal-ayouba @ collection 2161
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