Bibliothèque Tour du Valat

Se connecter

Mot de passe oublié ?
Pas encore inscrit ?

La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Détail

Ajouter au panier

Ajouter au panier

Lien vers la notice

Titre :	The influence of resting posture and orientation on alertness and escape in shorebirds (2022)
Auteurs :	April D. Timmis, Auteur ; Matthew R. E. Symonds, Auteur ; Michael A. Weston, Auteur
Type de document :	Article
Dans :	Journal of Ornithology (163(2) April, 2022)
Article en page(s) :	509-521
Langues:	Anglais
Résumé :	Birds face the challenge of avoiding predators, yet the postural adjustments they use to aid their thermoregulation (resting the bill on their back plumage and standing on one leg), may diminish their capacity to detect and escape from approaching predators. This may lead to a temperature-mediated trade-off between anti-predator and thermoregulatory behaviour. In this study, we examine the effect of posture, orientation of the bird relative to their ‘blind sector’ (gap in their visual field) and temperature on the alert and escape distances of ten shorebird species (273 experimental ‘approaches’ by an investigator). We predicted that (1) heat-conserving postures would be associated with shorter FIDs (flight initiation distances: the distance at which the bird commenced fleeing from the investigator); (2) low temperatures would be linked to shorter FIDs; and (3) approaches from a bird’s blind sector would result in shorter FIDs. Phylogenetically controlled mixed models revealed head posture (backrest or forward facing) did not significantly influence alert distance (AD) or FID. Standing on two legs was associated with longer ADs. Individual species’ models revealed two significant relationships. Approaches from within the blind sector were associated with shorter ADs and FIDs in Australian Pied Oystercatcher (Haematopus longirostris), while higher temperatures were associated with shorter FIDs in Red-necked Stint (Calidris ruficollis). Despite this, we reveal no strong evidence that wild-living shorebirds trade-off antipredator capacity and thermoregulatory behaviours. However, further investigation is warranted across a wider variety of birds.
En ligne :	https://doi.org/10.1007/s10336-021-01957-y

FAQ

Infos pratiques

Heures d'ouverture et contact

Lundi , mardi et jeudi de 9h à 12h et de 13h à 17h00 : ouverture au public ...

Liens utiles

A-
A
A+