Competition between Eurasian red and introduced Eastern grey squirrels: the energetic significance of body-mass differences

J M Bryce, J R Speakman, P J Johnson, D W Macdonald

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Daily energy expenditure (DEE),vas measured in sympatric populations of red and grey squirrels using the doubly labelled water technique. Grey squirrels had significantly higher DEEs than red squirrels. However, the difference between the species was not separable from the effects of body mass on DEE. The DEEs of both species were in accordance with published allometric predictions incorporating body mass and ambient temperature. The differences in energetic requirements and social dominance, both consequences of body size, may represent means by which grey squirrels exert more interspecific competition on red squirrels than do conspecifics, potentially driving populations below viable levels in some sites.

Original languageEnglish
Pages (from-to)1731-1736
Number of pages6
JournalProceedings of the Royal Society of London. B, Biological Sciences
Volume268
Publication statusPublished - 2001

Keywords

  • body mass
  • conservation
  • daily energy expenditure
  • doubly labelled
  • ater
  • red squirrel
  • grey squirrel
  • sciurus-vulgaris
  • foraging behavior
  • conifer woodland
  • activity budget
  • carolinensis
  • poulation
  • habitats
  • demography
  • abundance
  • patterns

Cite this

@article{e50c70779a874acfbd165f84ee3962c2,
title = "Competition between Eurasian red and introduced Eastern grey squirrels: the energetic significance of body-mass differences",
abstract = "Daily energy expenditure (DEE),vas measured in sympatric populations of red and grey squirrels using the doubly labelled water technique. Grey squirrels had significantly higher DEEs than red squirrels. However, the difference between the species was not separable from the effects of body mass on DEE. The DEEs of both species were in accordance with published allometric predictions incorporating body mass and ambient temperature. The differences in energetic requirements and social dominance, both consequences of body size, may represent means by which grey squirrels exert more interspecific competition on red squirrels than do conspecifics, potentially driving populations below viable levels in some sites.",
keywords = "body mass, conservation, daily energy expenditure, doubly labelled, ater, red squirrel, grey squirrel, sciurus-vulgaris, foraging behavior, conifer woodland, activity budget, carolinensis, poulation, habitats, demography, abundance, patterns",
author = "Bryce, {J M} and Speakman, {J R} and Johnson, {P J} and Macdonald, {D W}",
year = "2001",
language = "English",
volume = "268",
pages = "1731--1736",
journal = "Proceedings of the Royal Society of London. B, Biological Sciences",
issn = "0962-8452",
publisher = "ROYAL SOC CHEMISTRY",

}

TY - JOUR

T1 - Competition between Eurasian red and introduced Eastern grey squirrels

T2 - the energetic significance of body-mass differences

AU - Bryce, J M

AU - Speakman, J R

AU - Johnson, P J

AU - Macdonald, D W

PY - 2001

Y1 - 2001

N2 - Daily energy expenditure (DEE),vas measured in sympatric populations of red and grey squirrels using the doubly labelled water technique. Grey squirrels had significantly higher DEEs than red squirrels. However, the difference between the species was not separable from the effects of body mass on DEE. The DEEs of both species were in accordance with published allometric predictions incorporating body mass and ambient temperature. The differences in energetic requirements and social dominance, both consequences of body size, may represent means by which grey squirrels exert more interspecific competition on red squirrels than do conspecifics, potentially driving populations below viable levels in some sites.

AB - Daily energy expenditure (DEE),vas measured in sympatric populations of red and grey squirrels using the doubly labelled water technique. Grey squirrels had significantly higher DEEs than red squirrels. However, the difference between the species was not separable from the effects of body mass on DEE. The DEEs of both species were in accordance with published allometric predictions incorporating body mass and ambient temperature. The differences in energetic requirements and social dominance, both consequences of body size, may represent means by which grey squirrels exert more interspecific competition on red squirrels than do conspecifics, potentially driving populations below viable levels in some sites.

KW - body mass

KW - conservation

KW - daily energy expenditure

KW - doubly labelled

KW - ater

KW - red squirrel

KW - grey squirrel

KW - sciurus-vulgaris

KW - foraging behavior

KW - conifer woodland

KW - activity budget

KW - carolinensis

KW - poulation

KW - habitats

KW - demography

KW - abundance

KW - patterns

M3 - Article

VL - 268

SP - 1731

EP - 1736

JO - Proceedings of the Royal Society of London. B, Biological Sciences

JF - Proceedings of the Royal Society of London. B, Biological Sciences

SN - 0962-8452

ER -