Document Detail


A dynamic model of hypothermia as an adaptive response by small birds to winter conditions.
MedLine Citation:
PMID:  12000149     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
We present a dynamic programming model which is used to investigate hypothermia as an adaptive response by small passerine birds in winter. The model predicts that there is a threshold function of reserves during the night, below which it is optimal to enter hypothermia, and above which it is optimal to rest. This threshold function decreases during the night, with a particularly sharp drop at the end of the night, representing the time and energy costs associated with returning to normal body temperature. The results of the model emphasise the trade-off between energy and predation, not just between foraging options, but also between foraging during the day and entering hypothermia at night. The value of being able to use hypothermia represents not just energy savings, but also reduced predation risk due to changes in the optimal foraging strategy. Conditions which give a high value of hypothermia are short photoperiod, variable food supply, low temperatures, poor and scarce food supplies.
Authors:
N J Welton; A I Houston; J Ekman; J M McNamara
Related Documents :
3402669 - Sibling inhibition of hoarding in postweaning hamster pups (mesocricetus auratus).
10666359 - Stochastic variation in food availability influences weight and age at maturity.
16213529 - Individual discrimination capability and collective decision-making.
19425959 - Foraging rules for nectar: food choices by painted ladies.
12777119 - Nonlinear oscillations in marine hydroids.
10322509 - Food exploitation: searching for the optimal joining policy.
8471869 - Calculation of juice content in a diluted fruit juice beverage.
18381629 - Sleeping tree choice by bwindi chimpanzees.
2031909 - Total colectomy and massive small bowel resection in rats.
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Acta biotheoretica     Volume:  50     ISSN:  0001-5342     ISO Abbreviation:  Acta Biotheor.     Publication Date:  2002  
Date Detail:
Created Date:  2002-05-09     Completed Date:  2002-10-18     Revised Date:  2003-11-14    
Medline Journal Info:
Nlm Unique ID:  0421520     Medline TA:  Acta Biotheor     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  39-56     Citation Subset:  IM    
Affiliation:
School of Mathematics, CEMS, University of the West of England, Bristol, United Kingdom. Nicky.Welton@uwe.ac.uk
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:
Adaptation, Physiological / physiology*
Animals
Behavior, Animal
Birds / physiology*
Body Temperature
Energy Metabolism
Environment
Hypothermia
Mathematical Computing
Models, Biological*
Predatory Behavior
Seasons
Starvation
Weather*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


Previous Document:  Linear discrete population models with two time scales in fast changing environments II: non-autonom...
Next Document:  On the information-theoretical meaning of Hill's parametric evenness.