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Intraspecific competition: The role of lags between attack and death in host-parasitoid interactions

Cameron, T. C.; Metcalfe, Dan LU ; Beckerman, A. P. and Sait, S. M. (2007) In Ecology 88(5). p.1225-1231
Abstract
Many natural enemies do not immediately kill their host, and the lag this creates between attack and host death results in mixed populations of uninfected and infected hosts. Both competition and parasitism are known to be major structuring forces in ecological communities; however, surprisingly little is known about how the competitive nature of infected hosts could affect the survival and dynamics of remaining uninfected host populations. Using a laboratory system comprising the Indian meal moth, Plodia interpunctella, and a solitary koinobiont parasitoid, Venturia canescens, we address this question by conducting replicated competition experiments between the unparasitized and parasitized classes of host larvae. For varying proportions... (More)
Many natural enemies do not immediately kill their host, and the lag this creates between attack and host death results in mixed populations of uninfected and infected hosts. Both competition and parasitism are known to be major structuring forces in ecological communities; however, surprisingly little is known about how the competitive nature of infected hosts could affect the survival and dynamics of remaining uninfected host populations. Using a laboratory system comprising the Indian meal moth, Plodia interpunctella, and a solitary koinobiont parasitoid, Venturia canescens, we address this question by conducting replicated competition experiments between the unparasitized and parasitized classes of host larvae. For varying proportions of parasitized host larvae and competitor densities, we consider the effects of competition within (intraclass) and between (interclass) unparasitized and parasitized larvae on the survival, development time, and size of adult moths and parasitoid wasps. The greatest effects were on survival: increased competitor densities reduced survival of both parasitized and unparasitized larvae. However, unparasitized larvae survival, but not parasitized larvae survival, was reduced by increasing interclass competition. To our knowledge, this is the first experimental demonstration of the competitive superiority of parasitized over unparasitized hosts for limiting resources. We discuss possible mechanisms for this phenomenon, why it may have evolved, and its possible influence on the stability of host-parasite dynamics. (Less)
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author
publishing date
type
Contribution to journal
publication status
published
subject
keywords
parasitized competitors, purasitoid-host dynamics, Plodia, interpunctella, resource competition, Venturia canescens
in
Ecology
volume
88
issue
5
pages
1225 - 1231
publisher
Ecological Society of America
external identifiers
  • wos:000246369900017
  • scopus:34447094329
ISSN
0012-9658
DOI
10.1890/06-0661
language
English
LU publication?
no
id
47c3f23a-b19d-41e1-8d03-120c4f04e906 (old id 4644105)
date added to LUP
2014-09-23 15:16:49
date last changed
2017-01-01 06:44:57
@article{47c3f23a-b19d-41e1-8d03-120c4f04e906,
  abstract     = {Many natural enemies do not immediately kill their host, and the lag this creates between attack and host death results in mixed populations of uninfected and infected hosts. Both competition and parasitism are known to be major structuring forces in ecological communities; however, surprisingly little is known about how the competitive nature of infected hosts could affect the survival and dynamics of remaining uninfected host populations. Using a laboratory system comprising the Indian meal moth, Plodia interpunctella, and a solitary koinobiont parasitoid, Venturia canescens, we address this question by conducting replicated competition experiments between the unparasitized and parasitized classes of host larvae. For varying proportions of parasitized host larvae and competitor densities, we consider the effects of competition within (intraclass) and between (interclass) unparasitized and parasitized larvae on the survival, development time, and size of adult moths and parasitoid wasps. The greatest effects were on survival: increased competitor densities reduced survival of both parasitized and unparasitized larvae. However, unparasitized larvae survival, but not parasitized larvae survival, was reduced by increasing interclass competition. To our knowledge, this is the first experimental demonstration of the competitive superiority of parasitized over unparasitized hosts for limiting resources. We discuss possible mechanisms for this phenomenon, why it may have evolved, and its possible influence on the stability of host-parasite dynamics.},
  author       = {Cameron, T. C. and Metcalfe, Dan and Beckerman, A. P. and Sait, S. M.},
  issn         = {0012-9658},
  keyword      = {parasitized competitors,purasitoid-host dynamics,Plodia,interpunctella,resource competition,Venturia canescens},
  language     = {eng},
  number       = {5},
  pages        = {1225--1231},
  publisher    = {Ecological Society of America},
  series       = {Ecology},
  title        = {Intraspecific competition: The role of lags between attack and death in host-parasitoid interactions},
  url          = {http://dx.doi.org/10.1890/06-0661},
  volume       = {88},
  year         = {2007},
}