HervieuxMaguireJohnsEtAl2016
Reference
Hervieux, M., Maguire, D.Y., Johns, R.C., Bauce, E., Buddle, C.M. and Quiring, D.T. (2016) Hanging in the treetops: an in situ experiment in ancient hemlock assessing outbreak defoliator performance among crown levels. Ecological Entomology, 41(4):413-420. (Scopus 
)
Abstract
Past studies have shown that both egg lay and larval feeding of a generalist defoliator, pale-winged gray (Iridopsis ephyraria Walker) (Lepidoptera: Geometridae), are concentrated in the mid-lower crown of eastern hemlock [Tsuga canadensis (L.) Carr.]. 2. Using tree-climbing techniques, we carried out in situ bioassays in large hemlock trees (~25 m) to determine whether the observed foraging preferences are adaptive and how they reflect associated intra-tree variations in microhabitat quality associated with temperature and foliage nutritional quality. 3. In 1 of 2 years, larval survival was significantly higher in the shaded lower versus sunlit upper crown; however, in both years, groups that fed in the sunlit upper crown branches had larger male and female moths and more female-biased sex ratios. 4. Differences in pale-winged gray performance among crown levels were somewhat supported by trends in foliage nutritional chemistry but not well-correlated with variation in temperature. 5. The present study is one of only a few to carry out bioassays on large mature trees and results reinforce the idea that foraging patterns of herbivores are likely to reflect trade-offs among several factors that vary between sunlit and shaded branches within forest canopies. © Her Majesty the Queen in Right of Canada 2016. Reproduced with the permission of the Minister of Natural Resources Canada.
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@ARTICLE { HervieuxMaguireJohnsEtAl2016,
AUTHOR = { Hervieux, M. and Maguire, D.Y. and Johns, R.C. and Bauce, E. and Buddle, C.M. and Quiring, D.T. },
TITLE = { Hanging in the treetops: an in situ experiment in ancient hemlock assessing outbreak defoliator performance among crown levels },
JOURNAL = { Ecological Entomology },
YEAR = { 2016 },
VOLUME = { 41 },
PAGES = { 413-420 },
NUMBER = { 4 },
NOTE = { cited By 0 },
ABSTRACT = { Past studies have shown that both egg lay and larval feeding of a generalist defoliator, pale-winged gray (Iridopsis ephyraria Walker) (Lepidoptera: Geometridae), are concentrated in the mid-lower crown of eastern hemlock [Tsuga canadensis (L.) Carr.]. 2. Using tree-climbing techniques, we carried out in situ bioassays in large hemlock trees (~25 m) to determine whether the observed foraging preferences are adaptive and how they reflect associated intra-tree variations in microhabitat quality associated with temperature and foliage nutritional quality. 3. In 1 of 2 years, larval survival was significantly higher in the shaded lower versus sunlit upper crown; however, in both years, groups that fed in the sunlit upper crown branches had larger male and female moths and more female-biased sex ratios. 4. Differences in pale-winged gray performance among crown levels were somewhat supported by trends in foliage nutritional chemistry but not well-correlated with variation in temperature. 5. The present study is one of only a few to carry out bioassays on large mature trees and results reinforce the idea that foraging patterns of herbivores are likely to reflect trade-offs among several factors that vary between sunlit and shaded branches within forest canopies. © Her Majesty the Queen in Right of Canada 2016. Reproduced with the permission of the Minister of Natural Resources Canada. },
AUTHOR_KEYWORDS = { Foliage quality; foraging behavior; Iridopsis ephyraria; microclimate; tree canopy ecology },
DOCUMENT_TYPE = { Article },
DOI = { 10.1111/een.12311 },
KEYWORDS = { Geometridae; Iridopsis; Lepidoptera; Tsuga canadensis },
OWNER = { Luc },
SOURCE = { Scopus },
TIMESTAMP = { 2016.08.15 },
URL = { https://www.scopus.com/inward/record.uri?eid=2-s2.0-84963958064&partnerID=40&md5=e654375e74fd20b5624ffa2a06d3488b },
}
