Interactions among elk, aspen, galling sawflies and insectivorous birds

Joseph K. Bailey, Thomas G Whitham

Research output: Contribution to journalArticle

58 Citations (Scopus)

Abstract

Using two years of observational and experimental data, we examined the hypothesis that browsing by elk on aspen indirectly affects the distribution of a leaf-galling sawfly, which in turn affects insect diversity and foraging patterns of insectivorous birds. We found that: i) in an analyses of 33 arthropod species, the presence of sawflies significantly increased arthropod richness and abundance by 2 X and 2.5 X, respectively. ii) browsing by elk reduced sawfly gall abundance such that 90% of the galls were found on unbrowsed aspen ramets. iii) insectivorous birds attacked 60-74% of the galls on unbrowsed shoots compared to 11% on browsed shoots. When leaf-galler abundance was experimentally held constant on browsed and unbrowsed shoots, predation by insectivorous birds did not differ significantly. This result suggests that browsing affects the patterns of avian predation by altering the distribution of a galling insect. These data argue that bottom-up, top-down, and lateral factors can act in concert to affect the distribution of a galler, structure arthropod communities and affect predation by insectivorous birds.

Original languageEnglish (US)
Pages (from-to)127-134
Number of pages8
JournalOikos
Volume101
Issue number1
DOIs
StatePublished - Apr 1 2003

Fingerprint

sawflies
elks
gall
browsing
galls
arthropod
bird
shoot
predation
birds
shoots
arthropods
insect
arthropod communities
insects
leaves
foraging
distribution

ASJC Scopus subject areas

  • Ecology

Cite this

Interactions among elk, aspen, galling sawflies and insectivorous birds. / Bailey, Joseph K.; Whitham, Thomas G.

In: Oikos, Vol. 101, No. 1, 01.04.2003, p. 127-134.

Research output: Contribution to journalArticle

Bailey, Joseph K. ; Whitham, Thomas G. / Interactions among elk, aspen, galling sawflies and insectivorous birds. In: Oikos. 2003 ; Vol. 101, No. 1. pp. 127-134.
@article{f4564be54ef442de91e155c0a6b03b17,
title = "Interactions among elk, aspen, galling sawflies and insectivorous birds",
abstract = "Using two years of observational and experimental data, we examined the hypothesis that browsing by elk on aspen indirectly affects the distribution of a leaf-galling sawfly, which in turn affects insect diversity and foraging patterns of insectivorous birds. We found that: i) in an analyses of 33 arthropod species, the presence of sawflies significantly increased arthropod richness and abundance by 2 X and 2.5 X, respectively. ii) browsing by elk reduced sawfly gall abundance such that 90{\%} of the galls were found on unbrowsed aspen ramets. iii) insectivorous birds attacked 60-74{\%} of the galls on unbrowsed shoots compared to 11{\%} on browsed shoots. When leaf-galler abundance was experimentally held constant on browsed and unbrowsed shoots, predation by insectivorous birds did not differ significantly. This result suggests that browsing affects the patterns of avian predation by altering the distribution of a galling insect. These data argue that bottom-up, top-down, and lateral factors can act in concert to affect the distribution of a galler, structure arthropod communities and affect predation by insectivorous birds.",
author = "Bailey, {Joseph K.} and Whitham, {Thomas G}",
year = "2003",
month = "4",
day = "1",
doi = "10.1034/j.1600-0706.2003.12185.x",
language = "English (US)",
volume = "101",
pages = "127--134",
journal = "Oikos",
issn = "0030-1299",
publisher = "Wiley-Blackwell",
number = "1",

}

TY - JOUR

T1 - Interactions among elk, aspen, galling sawflies and insectivorous birds

AU - Bailey, Joseph K.

AU - Whitham, Thomas G

PY - 2003/4/1

Y1 - 2003/4/1

N2 - Using two years of observational and experimental data, we examined the hypothesis that browsing by elk on aspen indirectly affects the distribution of a leaf-galling sawfly, which in turn affects insect diversity and foraging patterns of insectivorous birds. We found that: i) in an analyses of 33 arthropod species, the presence of sawflies significantly increased arthropod richness and abundance by 2 X and 2.5 X, respectively. ii) browsing by elk reduced sawfly gall abundance such that 90% of the galls were found on unbrowsed aspen ramets. iii) insectivorous birds attacked 60-74% of the galls on unbrowsed shoots compared to 11% on browsed shoots. When leaf-galler abundance was experimentally held constant on browsed and unbrowsed shoots, predation by insectivorous birds did not differ significantly. This result suggests that browsing affects the patterns of avian predation by altering the distribution of a galling insect. These data argue that bottom-up, top-down, and lateral factors can act in concert to affect the distribution of a galler, structure arthropod communities and affect predation by insectivorous birds.

AB - Using two years of observational and experimental data, we examined the hypothesis that browsing by elk on aspen indirectly affects the distribution of a leaf-galling sawfly, which in turn affects insect diversity and foraging patterns of insectivorous birds. We found that: i) in an analyses of 33 arthropod species, the presence of sawflies significantly increased arthropod richness and abundance by 2 X and 2.5 X, respectively. ii) browsing by elk reduced sawfly gall abundance such that 90% of the galls were found on unbrowsed aspen ramets. iii) insectivorous birds attacked 60-74% of the galls on unbrowsed shoots compared to 11% on browsed shoots. When leaf-galler abundance was experimentally held constant on browsed and unbrowsed shoots, predation by insectivorous birds did not differ significantly. This result suggests that browsing affects the patterns of avian predation by altering the distribution of a galling insect. These data argue that bottom-up, top-down, and lateral factors can act in concert to affect the distribution of a galler, structure arthropod communities and affect predation by insectivorous birds.

UR - http://www.scopus.com/inward/record.url?scp=0037907238&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0037907238&partnerID=8YFLogxK

U2 - 10.1034/j.1600-0706.2003.12185.x

DO - 10.1034/j.1600-0706.2003.12185.x

M3 - Article

VL - 101

SP - 127

EP - 134

JO - Oikos

JF - Oikos

SN - 0030-1299

IS - 1

ER -