Nom du corpus

Corpus Systématique Animale

Titre du document

Weight changes of cross-desert migrants at an oasis —do energetic considerations alone determine the length of stopover?

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Éditeur
Springer (journals)
Langue(s) du document
Anglais
Type de document
Research-article
Mots-clés d'auteur
  • Desert
  • Migration
  • Passerines
  • Sinai
  • Weight
Nom du fichier dans la ressource
Oiseaux_v2b_01774
Auteur(s)
  • Uriel N. Safriel 1
  • Daphna Lavee 1
Affiliation(s)
  • 1) Department of Zoology, The Hebrew University of Jerusalem, 91904, Jerusalem, Israel
Résumé

Trans-Saharan insectivorous passerine night migrants stopping-over at a small oasis in Sinai were weighed as frequently as possible, throughout the entire length of fall and spring migration passages. Due to the small size of the oasis and the intensive trapping effort, most stopping-over birds were captured and weighed throughout a sizeable portion of their stopover period. Weights at first capture were either similar in both seasons, or greater in fall than in spring. In some species fall migrants that stayed one day were heavier than those staying longer. In other species, and for all species in spring, weights of birds that stayed one day did not differ from those staying longer. In most species the weight of birds that stayed for more than one day did not vary significantly between arrival and departure, and cases of weight gains were commoner in fall than in spring. Trends of weight changes of an individual during stopover were usually inconsistent, but the longer it stayed, more it gained (in fall), or less it lost (in spring). It is proposed that stopping-over birds do not always resume their migration only after their fat reserves have been replenished, but that their decision to take off, or the reappearance of the migration impulse, are also controlled by a time program incorporated into their endogenous migration scheme, which constantly updates the time left for sampling and refuelling. It seems that in spring less time is allotted for the whole migration program, hence the time constraint overrides then all other tactical considerations, such as the state of fat reserves, and the weather.

Catégories Science-Metrix
  • 1 - natural sciences
  • 2 - biology
  • 3 - ecology
Catégories INIST
  • 1 - sciences appliquees, technologies et medecines
  • 2 - sciences biologiques et medicales
  • 3 - sciences biologiques fondamentales et appliquees. psychologie
Catégories Scopus
  • 1 - Life Sciences ; 2 - Agricultural and Biological Sciences ; 3 - Ecology, Evolution, Behavior and Systematics
Catégories WoS
  • 1 - science ; 2 - ecology
Identifiant ISTEX
3D72DC84A6CE3C6F5DA7A959C15B26E855FEFCD3
Revue

Oecologia

Année de publication
1988
Présence de XML structuré
Non
Version PDF
1.3
Score qualité du texte
10
Sous-corpus
  • Oiseaux
Type de publication
Journal
ark:/67375/1BB-47LS5B8T-T
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