HunterLechowicz1992

Référence

Hunter, A.F., Lechowicz, M.J. (1992) Foliage quality changes during canopy development of some northern hardwood trees. Oecologia, 89(3):316-323.

Résumé

The ephemerality of high quality foliage in spring may act as a defense for trees against early season folivores, but only if the duration of high quality is so short that it is difficult for insects to synchronize their eclosion with the period of high quality foliage that follows budbreak. The rate of change in foliage quality on a day to day basis through the spring was determined for nine species of hardwood trees. Measurement of physical and chemical parameters and a bioassay with gypsy moth Lymantria dispar larvae both showed decreasing quality during the 3-5 wk of canopy development in all species. Rates of decline differed among species but the patterns were similar from year to year on a degree-day scale. Growth rates of larvae raised through the first stadium on foliage of differing ages reflected these changes in foliage acceptability. Increasing toughness and declining nitrogen and water contents of leaves were correlated with changes in acceptability to larvae but explained only a small part of the variation in acceptability. The host-seeking period of gypsy moth larvae overlapped with the availability of highly acceptable foliage of the most-preferred host species. Less-preferred species had more rapid declines in foliage acceptability, and hence narrower overlaps with the host-seeking period, which may provide defense against use by this generalist forest pest. -Authors

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@ARTICLE { HunterLechowicz1992,
    AUTHOR = { Hunter, A.F. and Lechowicz, M.J. },
    TITLE = { Foliage quality changes during canopy development of some northern hardwood trees },
    JOURNAL = { Oecologia },
    YEAR = { 1992 },
    VOLUME = { 89 },
    PAGES = { 316-323 },
    NUMBER = { 3 },
    NOTE = { 00298549 (ISSN) Cited By (since 1996): 54 Export Date: 26 April 2007 Source: Scopus Language of Original Document: English },
    ABSTRACT = { The ephemerality of high quality foliage in spring may act as a defense for trees against early season folivores, but only if the duration of high quality is so short that it is difficult for insects to synchronize their eclosion with the period of high quality foliage that follows budbreak. The rate of change in foliage quality on a day to day basis through the spring was determined for nine species of hardwood trees. Measurement of physical and chemical parameters and a bioassay with gypsy moth Lymantria dispar larvae both showed decreasing quality during the 3-5 wk of canopy development in all species. Rates of decline differed among species but the patterns were similar from year to year on a degree-day scale. Growth rates of larvae raised through the first stadium on foliage of differing ages reflected these changes in foliage acceptability. Increasing toughness and declining nitrogen and water contents of leaves were correlated with changes in acceptability to larvae but explained only a small part of the variation in acceptability. The host-seeking period of gypsy moth larvae overlapped with the availability of highly acceptable foliage of the most-preferred host species. Less-preferred species had more rapid declines in foliage acceptability, and hence narrower overlaps with the host-seeking period, which may provide defense against use by this generalist forest pest. -Authors },
    KEYWORDS = { foliage quality gypsy moth host quality northern hardwood Lymantria dispar },
    OWNER = { brugerolles },
    TIMESTAMP = { 2007.12.05 },
}

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