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  • Dalin, PeterSwedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för ekologi,Department of Ecology (author)

Host-plant quality adaptively affects the diapause threshold : evidence from leaf beetles in willow plantations

  • Article/chapterEnglish2012

Publisher, publication year, extent ...

  • 2012-11-28
  • Wiley,2012
  • electronicrdacarrier

Numbers

  • LIBRIS-ID:oai:DiVA.org:su-84793
  • https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-84793URI
  • https://doi.org/10.1111/j.1365-2311.2012.01387.xDOI
  • https://res.slu.se/id/publ/40138URI

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  • Language:English
  • Summary in:English

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  • Subject category:ref swepub-contenttype
  • Subject category:art swepub-publicationtype

Notes

  • AuthorCount:2;
  • 1. Voltinism of herbivorous insects can vary depending on environmental conditions. The leaf beetle Phratora vulgatissima L. is univoltine in Sweden but will sometimes initiate a second generation in short-rotation coppice (SRC) willow plantations. 2. The study investigated whether increased voltinism by P. vulgatissima in plantations can be explained by (i) rapid life-cycle development allowing two generations, or (ii) postponed diapause induction on coppiced willows. 3. In the field, no difference was found in the phenology or development of first-generation broods between plantations (S. viminalis) and natural willow habitats (S. cinerea). However, the induction of diapause occurred 12 weeks later in SRC willow plantations. 4. Laboratory experiments indicated no genetic difference in the critical day-length for diapause induction between beetles originating from plantations and natural habitats. Development time was unaffected by host-plant quality but critical day-length was prolonged by almost an hour when the beetles were reared on a non-preferred willow species (S. phylicifolia). When reared on new leaves from re-sprouting shoots of recently coppiced willow plants, diapause incidence was significantly less than when the beetles were reared on mature leaves from uncoppiced plants. 5. The study suggests that P. vulgatissima has a plastic diapause threshold influenced by host-plant quality. The use of host-plant quality as a diapause-inducing stimulus is likely to be adaptive in cases where food resources are unpredictable, such as when new host-plant tissue is produced after a disturbance. SRC willows may allow two beetle generations due to longer growing seasons of coppiced plants that grow vigorously.

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  • Nylin, SörenStockholms universitet,Zoologiska institutionen(Swepub:su)snylin (author)
  • Sveriges lantbruksuniversitetInstitutionen för ekologi (creator_code:org_t)
  • Sveriges lantbruksuniversitet

Related titles

  • In:Ecological Entomology: Wiley37:6, s. 490-4990307-69461365-2311

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By the author/editor
Dalin, Peter
Nylin, Sören
About the subject
NATURAL SCIENCES
NATURAL SCIENCES
and Biological Scien ...
and Zoology
NATURAL SCIENCES
NATURAL SCIENCES
and Biological Scien ...
and Ecology
NATURAL SCIENCES
NATURAL SCIENCES
and Biological Scien ...
and Evolutionary Bio ...
Articles in the publication
Ecological Entom ...
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Stockholm University
Swedish University of Agricultural Sciences

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