Silk properties and overwinter survival in gregarious butterfly larvae

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http://hdl.handle.net/10138/296518

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Duplouy , A , Minard , G , Lähteenaro , M , Rytteri , S & Saastamoinen , M 2018 , ' Silk properties and overwinter survival in gregarious butterfly larvae ' , Ecology and Evolution , vol. 8 , no. 24 , pp. 12443-12455 . https://doi.org/10.1002/ece3.4595

Title: Silk properties and overwinter survival in gregarious butterfly larvae
Author: Duplouy, Anne; Minard, Guillaume; Lähteenaro, Meri; Rytteri, Susu; Saastamoinen, Marjo
Other contributor: University of Helsinki, Research Centre for Ecological Change
University of Helsinki, Ecology and Evolutionary Biology
University of Helsinki, Zoology
University of Helsinki, Research Centre for Ecological Change
University of Helsinki, Research Centre for Ecological Change





Date: 2018-12
Language: eng
Number of pages: 13
Belongs to series: Ecology and Evolution
ISSN: 2045-7758
DOI: https://doi.org/10.1002/ece3.4595
URI: http://hdl.handle.net/10138/296518
Abstract: All organisms are challenged by encounters with parasites, which strongly select for efficient escape strategies in the host. The threat is especially high for gregarious species entering immobile periods, such as diapause. Larvae of the Glanville fritillary butterfly, Melitaea cinxia, spend the winter in diapause in groups of conspecifics each sheltered in a silk nest. Despite intensive monitoring of the population, we have little understanding of the ecological factors influencing larval survival over the winter in the field. We tested whether qualitative and quantitative properties of the silk nest contribute to larval survival over diapause. We used comparative proteomics, metabarcoding analyses, microscopic imaging, and in vitro experiments to compare protein composition of the silk, community composition of the silk-associated microbiota, and silk density from both wild-collected and laboratory-reared families, which survived or died in the field. Although most traits assessed varied across families, only silk density was correlated with overwinter survival in the field. The silk nest spun by gregarious larvae before the winter acts as an efficient breathable physical shield that positively affects larval survival during diapause. Such benefit may explain how this costly trait is conserved across populations of this butterfly species and potentially across other silk-spinning insect species.
Subject: diapause
electron microscopy
mass spectrometry
microbiota
winter-nest
DIAPAUSE-SPECIFIC PEPTIDE
GEOGRAPHIC-VARIATION
LEAF BEETLE
INSECT
GENOME
EXPRESSION
METAPOPULATION
MECHANISMS
EVOLUTION
HEMOLYMPH
1181 Ecology, evolutionary biology
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