Variable responses of natural enemies to Salix triandra phenotypes with different secondary chemistry

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MARC

Hjältén, Joakim (author)

Variable responses of natural enemies to Salix triandra phenotypes with different secondary chemistry

Article/chapterEnglish2007

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Wiley-Blackwell,2007
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LIBRIS-ID:oai:DiVA.org:umu-5170
https://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-5170URI
https://doi.org/10.1111/j.0030-1299.2007.15365.xDOI

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Language:English
Summary in:English

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

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Originally included in thesis in manuscript form, with title: "Variable responses of natural enemies to phenotypic variation in Salix triandra: the importance of plant secondary chemistry".
Plant phenotypes often differ in their resistance to natural enemies, but the mechanism for this has seldom been identified. The aim of this study was to determine if the spatial patterns of phenotype use of a highly specialized insect herbivore (the galling sawfly Pontania triandrae) in a natural willow population can be related to phenotypic variation in plant secondary chemistry. Furthermore, we tested if traits that confer resistance to one type of natural enemy, i.e. the galling sawfly, also confer resistance to others, in our case a leaf beetle Gonioctena linnaeana and the rust fungus Melampsora amygdalinae. We identified 18 phenotypes with high and 18 phenotypes with low gall density in our field population and determined gall densities, the degree of leaf damage and rust infection on each phenotype and collected leaves for chemical analyses. The concentration of phenolics was higher in phenotypes with high density of galls suggesting that this galling sawfly may use phenolics as oviposition cues. Rust infection showed the opposite pattern, with lower levels on clones with high concentration of phenolics, while leaf damage by G. linnaeana did not differ between clone types. This indicates that these important natural enemies may assert divergent selection on willow phenotypes and that this might provide a mechanism for maintaining phenotypic variation within willow populations.

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NATURVETENSKAP Biologi Ekologi hsv//swe
NATURAL SCIENCES Biological Sciences Ecology hsv//eng

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Niemi, LenaUmeå universitet,Institutionen för ekologi, miljö och geovetenskap (author)
Wennström, AndersUmeå universitet,Institutionen för ekologi, miljö och geovetenskap(Swepub:umu)anwe0004 (author)
Ericson, LarsUmeå universitet,Institutionen för ekologi, miljö och geovetenskap(Swepub:umu)laer0001 (author)
Roininen, Heikki (author)
Julkunen-Tiitto, Riitta (author)
Umeå universitetInstitutionen för ekologi, miljö och geovetenskap (creator_code:org_t)

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In:Oikos: Wiley-Blackwell116:5, s. 751-7580030-12991600-0706

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By the author/editor: Hjältén, Joakim; Niemi, Lena; Wennström, Ander ...; Ericson, Lars; Roininen, Heikki; Julkunen-Tiitto, ...

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NATURAL SCIENCES: NATURAL SCIENCES; and Biological Scien ...; and Ecology

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