If you are experiencing problems downloading PDF or HTML fulltext, our helpdesk recommend clearing your browser cache and trying again. If you need help in clearing your cache, please click here . Still need help? Email help@ingentaconnect.com

Resource allocation in fledglings of the rhinoceros auklet under different feeding conditions: an experiment manipulating meal size and frequency

$50.00 plus tax (Refund Policy)

Buy Article:

Abstract:

By manipulating meal size and frequency in an alcid, the rhinoceros auklet (Cerorhinca monocerata (Pallas, 1811)), we examined two hypotheses: (1) poorly fed chicks allocate resources preferentially to developing organs essential for fledging, and (2) intermittently fed chicks deposit more lipids than regularly fed ones. Chicks were fed normal (NORMAL; 40–80 g, mean meal mass in a normal year), small (LOW; 26–54 g, half of NORMAL), or large (HIGH; 80–160 g, twice as much as NORMAL) amounts of sandlance (Ammodytes personatus Girard, 1856) every day or the large meal (80–160 g) every 2 days (INTERMITTENT). Chicks fed more food grew faster. The HIGH group had the greatest fledging mass and shortest fledging period. The wingspan and brain mass of fledglings did not differ among groups. The heart, liver, and breast muscle at fledging were 15%–25% smaller in the LOW group than in the NORMAL group but did not differ between the NORMAL and HIGH groups. The total lipid was 43% greater in the HIGH group than in the NORMAL group, and that of the LOW group was 38% smaller. The INTERMITTENT group had a similar lipid mass to the NORMAL group. Chicks feeding on small meals seemed to maintain the growth of organs essential for fledging, while chicks feeding on large meals seemed to deposit a surplus as lipid rather than allocate more to the development of organs.

En manipulant la taille et la fréquence des repas, nous avons évalué deux hypothèses chez le macareux rhinocéros (Cerorhinca monocerata (Pallas, 1811)) : (1) les oisillons mal nourris font une allocation préférentielle de leurs ressources aux organes en développement nécessaires pour l'envol et (2) les oisillons nourris par intermittence font plus de dépôts de graisse que les oisillons nourris régulièrement. Nous avons nourri les oisillons de quantités normales (40–80 g, masse moyenne d'un repas lors d'une année normale, NORMAL), faibles (26–54 g, LOW, la moitié de NORMAL) ou élevées (80–160 g, HIGH, deux fois NORMAL) de lançons (Ammodytes personatus Girard, 1856) chaque jour, ou alors d'un gros repas (80–160 g) à tous les deux jours (INTERMITTENT). Les oisillons qui reçoivent plus de nourriture croissent plus rapidement. Le groupe HIGH a la masse à l'envol la plus importante et la période d'envol la plus courte. L'envergure des ailes et la masse du cerveau ne diffèrent pas d'un groupe à l'autre. Le coeur, le foie et le muscle pectoral sont 15 % – 25 % plus petits au moment de l'envol dans le groupe LOW que dans le groupe NORMAL; il n'y a cependant pas de différence entre les groupes NORMAL et HIGH. Les lipides totaux sont 43 % plus importants dans le groupe HIGH que dans le groupe NORMAL et ceux du groupe LOW sont 38 % moins importants. Le groupe INTERMITTENT a une masse lipidique semblable à celle du groupe NORMAL. Les oisillons qui se nourrissent de petits repas semblent maintenir la croissance des organes essentiels à l'envol, alors que les oisillons nourris de gros repas semblent déposer le surplus sous forme de lipides plutôt que d'allouer plus de ressources au développement des organes.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: November 1, 2005

More about this publication?
  • Published since 1929, this monthly journal reports on primary research contributed by respected international scientists in the broad field of zoology, including behaviour, biochemistry and physiology, developmental biology, ecology, genetics, morphology and ultrastructure, parasitology and pathology, and systematics and evolution. It also invites experts to submit review articles on topics of current interest.
  • Information for Authors
  • Submit a Paper
  • Subscribe to this Title
  • Terms & Conditions
  • Sample Issue
  • Reprints & Permissions
  • ingentaconnect is not responsible for the content or availability of external websites
Related content

Tools

Favourites

Share Content

Access Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content
Cookie Policy
X
Cookie Policy
ingentaconnect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more