Density-dependent intraguild predation of an aphid parasitoid

Research output: Contribution to journalArticle

45 Citations (Scopus)

Abstract

A growing body of research has examined the effect of shared resource density on intraguild predation (IGP) over relatively short time frames. Most of this work has led to the conclusion that when the shared resource density is high, the strength of IGP should be lower, due to prey dilution. However, experiments addressing this topic have been done using micro- or mesocosms that excluded the possibility of intraguild predator aggregation. We examined the effect of shared resource density on IGP of an aphid parasitoid in an open field setting where the effects of prey dilution and predator aggregation could occur simultaneously. We brought potted soybean plants with 2, 20, or 200 soybean aphids (Aphis glycines) and 20 pupae ('mummies') of the soybean aphid parasitoid Binodoxys communis into soybean fields in Minnesota, USA. We monitored predator aggregation onto the potted plants, predation of parasitoid mummies, and successful adult emergence of B. communis. We found that predator aggregation was higher at the higher aphid densities on our experimental plants and that this coincided with lower adult emergence of B. communis, indicating that even if a prey dilution effect occurred in our study, it was overcome by short-term predator aggregation. Our results suggest that the effect of shared resource density on IGP may be more nuanced in a field setting than in microcosms due to predator aggregation.

Original languageEnglish (US)
Pages (from-to)213-220
Number of pages8
JournalOecologia
Volume164
Issue number1
DOIs
StatePublished - Apr 6 2010

Fingerprint

intraguild predation
aphid
parasitoid
Aphidoidea
predator
predation
Aphis glycines
predators
soybean
dilution
resource
microcosm
Binodoxys
soybeans
container-grown plants
pupa
pupae
effect

Keywords

  • Aggregation
  • Apparent competition
  • Binodoxys communis
  • Biological control
  • Soybean aphid

Cite this

Density-dependent intraguild predation of an aphid parasitoid. / Chacon, Jeremy M; Heimpel, George E.

In: Oecologia, Vol. 164, No. 1, 06.04.2010, p. 213-220.

Research output: Contribution to journalArticle

@article{1301838957094356a2f8ffa3839942f0,
title = "Density-dependent intraguild predation of an aphid parasitoid",
abstract = "A growing body of research has examined the effect of shared resource density on intraguild predation (IGP) over relatively short time frames. Most of this work has led to the conclusion that when the shared resource density is high, the strength of IGP should be lower, due to prey dilution. However, experiments addressing this topic have been done using micro- or mesocosms that excluded the possibility of intraguild predator aggregation. We examined the effect of shared resource density on IGP of an aphid parasitoid in an open field setting where the effects of prey dilution and predator aggregation could occur simultaneously. We brought potted soybean plants with 2, 20, or 200 soybean aphids (Aphis glycines) and 20 pupae ('mummies') of the soybean aphid parasitoid Binodoxys communis into soybean fields in Minnesota, USA. We monitored predator aggregation onto the potted plants, predation of parasitoid mummies, and successful adult emergence of B. communis. We found that predator aggregation was higher at the higher aphid densities on our experimental plants and that this coincided with lower adult emergence of B. communis, indicating that even if a prey dilution effect occurred in our study, it was overcome by short-term predator aggregation. Our results suggest that the effect of shared resource density on IGP may be more nuanced in a field setting than in microcosms due to predator aggregation.",
keywords = "Aggregation, Apparent competition, Binodoxys communis, Biological control, Soybean aphid",
author = "Chacon, {Jeremy M} and Heimpel, {George E}",
year = "2010",
month = "4",
day = "6",
doi = "10.1007/s00442-010-1611-7",
language = "English (US)",
volume = "164",
pages = "213--220",
journal = "Oecologia",
issn = "0029-8549",
publisher = "Springer Verlag",
number = "1",

}

TY - JOUR

T1 - Density-dependent intraguild predation of an aphid parasitoid

AU - Chacon, Jeremy M

AU - Heimpel, George E

PY - 2010/4/6

Y1 - 2010/4/6

N2 - A growing body of research has examined the effect of shared resource density on intraguild predation (IGP) over relatively short time frames. Most of this work has led to the conclusion that when the shared resource density is high, the strength of IGP should be lower, due to prey dilution. However, experiments addressing this topic have been done using micro- or mesocosms that excluded the possibility of intraguild predator aggregation. We examined the effect of shared resource density on IGP of an aphid parasitoid in an open field setting where the effects of prey dilution and predator aggregation could occur simultaneously. We brought potted soybean plants with 2, 20, or 200 soybean aphids (Aphis glycines) and 20 pupae ('mummies') of the soybean aphid parasitoid Binodoxys communis into soybean fields in Minnesota, USA. We monitored predator aggregation onto the potted plants, predation of parasitoid mummies, and successful adult emergence of B. communis. We found that predator aggregation was higher at the higher aphid densities on our experimental plants and that this coincided with lower adult emergence of B. communis, indicating that even if a prey dilution effect occurred in our study, it was overcome by short-term predator aggregation. Our results suggest that the effect of shared resource density on IGP may be more nuanced in a field setting than in microcosms due to predator aggregation.

AB - A growing body of research has examined the effect of shared resource density on intraguild predation (IGP) over relatively short time frames. Most of this work has led to the conclusion that when the shared resource density is high, the strength of IGP should be lower, due to prey dilution. However, experiments addressing this topic have been done using micro- or mesocosms that excluded the possibility of intraguild predator aggregation. We examined the effect of shared resource density on IGP of an aphid parasitoid in an open field setting where the effects of prey dilution and predator aggregation could occur simultaneously. We brought potted soybean plants with 2, 20, or 200 soybean aphids (Aphis glycines) and 20 pupae ('mummies') of the soybean aphid parasitoid Binodoxys communis into soybean fields in Minnesota, USA. We monitored predator aggregation onto the potted plants, predation of parasitoid mummies, and successful adult emergence of B. communis. We found that predator aggregation was higher at the higher aphid densities on our experimental plants and that this coincided with lower adult emergence of B. communis, indicating that even if a prey dilution effect occurred in our study, it was overcome by short-term predator aggregation. Our results suggest that the effect of shared resource density on IGP may be more nuanced in a field setting than in microcosms due to predator aggregation.

KW - Aggregation

KW - Apparent competition

KW - Binodoxys communis

KW - Biological control

KW - Soybean aphid

UR - http://www.scopus.com/inward/record.url?scp=77955771424&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=77955771424&partnerID=8YFLogxK

U2 - 10.1007/s00442-010-1611-7

DO - 10.1007/s00442-010-1611-7

M3 - Article

C2 - 20369258

AN - SCOPUS:77955771424

VL - 164

SP - 213

EP - 220

JO - Oecologia

JF - Oecologia

SN - 0029-8549

IS - 1

ER -