Detection of refuge from enemies through phenological mismatching in multitrophic interactions requires season-wide estimation of host abundance

N.A.G. Kerstes, P.W. de Jong

Research output: Contribution to journalArticleAcademicpeer-review

5 Citations (Scopus)

Abstract

The concept of ‘‘enemy-free space’’ (EFS) refers to ways of living that reduce or eliminate the vulnerability of a species to natural enemies. It has been invoked to explain host shifts of phytophagous insects. A demonstrated cause of EFS is escape from enemies in time, through phenological mismatching of herbivore development and enemy occurrence, leading to low percentages of predation/parasitism of herbivores occurring at a certain time. The mere measurement of percentage parasitism, however, is not sufficient to demonstrate EFS in certain cases. Here we present such a case, where parasitism was studied of a phytophagous insect (Phyllotreta nemorum), using two different host plant species in the field: an atypical, relatively rarely used, plant (Barbarea vulgaris), and a more widely used one (Sinapis arvensis). At one location we found a paradoxical result: on each separate sampling day throughout the season the percentage of parasitism of P. nemorum using a patch of B. vulgaris was not significantly different from, or even significantly higher than on a nearby patch of S. arvensis. The overall season-wide proportion parasitism of the flea beetle cohort using the B. vulgaris patch, however, was lower. We conclude that, in the year and at the location we studied, the patch of B. vulgaris provided enemy-free space to the herbivore in the form of a temporal refuge, and that the importance of enemy-free space in the use of an atypical host plant should be evaluated on the basis of season-wide sampling, including estimation of host population size.
Original languageEnglish
Pages (from-to)485-498
JournalEvolutionary Ecology
Volume25
Issue number2
DOIs
Publication statusPublished - 2011

Fingerprint

enemy free space
Barbarea vulgaris
refuge
parasitism
Sinapis arvensis
herbivores
phytophagous insects
herbivore
Phyllotreta nemorum
insect
Chrysomelidae
flea
natural enemies
sampling
natural enemy
population size
host plants
host plant
predation
beetle

Keywords

  • plant barbarea-vulgaris
  • free space
  • phyllotreta-nemorum
  • natural enemies
  • flea beetle
  • phytophagous arthropods
  • rhagoletis-pomonella
  • insect herbivores
  • defenses
  • communities

Cite this

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title = "Detection of refuge from enemies through phenological mismatching in multitrophic interactions requires season-wide estimation of host abundance",
abstract = "The concept of ‘‘enemy-free space’’ (EFS) refers to ways of living that reduce or eliminate the vulnerability of a species to natural enemies. It has been invoked to explain host shifts of phytophagous insects. A demonstrated cause of EFS is escape from enemies in time, through phenological mismatching of herbivore development and enemy occurrence, leading to low percentages of predation/parasitism of herbivores occurring at a certain time. The mere measurement of percentage parasitism, however, is not sufficient to demonstrate EFS in certain cases. Here we present such a case, where parasitism was studied of a phytophagous insect (Phyllotreta nemorum), using two different host plant species in the field: an atypical, relatively rarely used, plant (Barbarea vulgaris), and a more widely used one (Sinapis arvensis). At one location we found a paradoxical result: on each separate sampling day throughout the season the percentage of parasitism of P. nemorum using a patch of B. vulgaris was not significantly different from, or even significantly higher than on a nearby patch of S. arvensis. The overall season-wide proportion parasitism of the flea beetle cohort using the B. vulgaris patch, however, was lower. We conclude that, in the year and at the location we studied, the patch of B. vulgaris provided enemy-free space to the herbivore in the form of a temporal refuge, and that the importance of enemy-free space in the use of an atypical host plant should be evaluated on the basis of season-wide sampling, including estimation of host population size.",
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Detection of refuge from enemies through phenological mismatching in multitrophic interactions requires season-wide estimation of host abundance. / Kerstes, N.A.G.; de Jong, P.W.

In: Evolutionary Ecology, Vol. 25, No. 2, 2011, p. 485-498.

Research output: Contribution to journalArticleAcademicpeer-review

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T1 - Detection of refuge from enemies through phenological mismatching in multitrophic interactions requires season-wide estimation of host abundance

AU - Kerstes, N.A.G.

AU - de Jong, P.W.

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PY - 2011

Y1 - 2011

N2 - The concept of ‘‘enemy-free space’’ (EFS) refers to ways of living that reduce or eliminate the vulnerability of a species to natural enemies. It has been invoked to explain host shifts of phytophagous insects. A demonstrated cause of EFS is escape from enemies in time, through phenological mismatching of herbivore development and enemy occurrence, leading to low percentages of predation/parasitism of herbivores occurring at a certain time. The mere measurement of percentage parasitism, however, is not sufficient to demonstrate EFS in certain cases. Here we present such a case, where parasitism was studied of a phytophagous insect (Phyllotreta nemorum), using two different host plant species in the field: an atypical, relatively rarely used, plant (Barbarea vulgaris), and a more widely used one (Sinapis arvensis). At one location we found a paradoxical result: on each separate sampling day throughout the season the percentage of parasitism of P. nemorum using a patch of B. vulgaris was not significantly different from, or even significantly higher than on a nearby patch of S. arvensis. The overall season-wide proportion parasitism of the flea beetle cohort using the B. vulgaris patch, however, was lower. We conclude that, in the year and at the location we studied, the patch of B. vulgaris provided enemy-free space to the herbivore in the form of a temporal refuge, and that the importance of enemy-free space in the use of an atypical host plant should be evaluated on the basis of season-wide sampling, including estimation of host population size.

AB - The concept of ‘‘enemy-free space’’ (EFS) refers to ways of living that reduce or eliminate the vulnerability of a species to natural enemies. It has been invoked to explain host shifts of phytophagous insects. A demonstrated cause of EFS is escape from enemies in time, through phenological mismatching of herbivore development and enemy occurrence, leading to low percentages of predation/parasitism of herbivores occurring at a certain time. The mere measurement of percentage parasitism, however, is not sufficient to demonstrate EFS in certain cases. Here we present such a case, where parasitism was studied of a phytophagous insect (Phyllotreta nemorum), using two different host plant species in the field: an atypical, relatively rarely used, plant (Barbarea vulgaris), and a more widely used one (Sinapis arvensis). At one location we found a paradoxical result: on each separate sampling day throughout the season the percentage of parasitism of P. nemorum using a patch of B. vulgaris was not significantly different from, or even significantly higher than on a nearby patch of S. arvensis. The overall season-wide proportion parasitism of the flea beetle cohort using the B. vulgaris patch, however, was lower. We conclude that, in the year and at the location we studied, the patch of B. vulgaris provided enemy-free space to the herbivore in the form of a temporal refuge, and that the importance of enemy-free space in the use of an atypical host plant should be evaluated on the basis of season-wide sampling, including estimation of host population size.

KW - plant barbarea-vulgaris

KW - free space

KW - phyllotreta-nemorum

KW - natural enemies

KW - flea beetle

KW - phytophagous arthropods

KW - rhagoletis-pomonella

KW - insect herbivores

KW - defenses

KW - communities

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DO - 10.1007/s10682-010-9425-y

M3 - Article

VL - 25

SP - 485

EP - 498

JO - Evolutionary Ecology

JF - Evolutionary Ecology

SN - 0269-7653

IS - 2

ER -