caa a22 4500 469096764 CHVBK 20180323133033.0 cr unu---uuuuu 170328e19920301xx s 000 0 eng 10.1007/BF00317408 doi (NATIONALLICENCE)springer-10.1007/BF00317408 Foliage quality changes during canopy development of some northern hardwood trees [Elektronische Daten] [Alison Hunter, Martin Lechowicz] Summary: 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 9 species of hardwood trees in 2-3 years. Measurement of physical and chemical parameters and a bioassay with gypsy moth larvae both showed decreasing quality during the three to five weeks 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 over-lapped 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. Springer-Verlag, 1992 Host quality nationallicence Leaf phenology nationallicence Synchrony nationallicence Insect-plant interactions nationallicence Lymantria dispar nationallicence Hunter Alison Biology Department, McGill University, 1205 Ave. Dr. Penfield, H3A 1B1, Montreal, Quebec, Canada aut Lechowicz Martin Biology Department, McGill University, 1205 Ave. Dr. Penfield, H3A 1B1, Montreal, Quebec, Canada aut Oecologia Springer-Verlag 89/3(1992-03-01), 316-323 0029-8549 89:3<316 1992 89 442 https://doi.org/10.1007/BF00317408 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00317408 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Hunter Alison Biology Department, McGill University, 1205 Ave. Dr. Penfield, H3A 1B1, Montreal, Quebec, Canada aut NATIONALLICENCE 700 1- Lechowicz Martin Biology Department, McGill University, 1205 Ave. Dr. Penfield, H3A 1B1, Montreal, Quebec, Canada aut NATIONALLICENCE 773 0- Oecologia Springer-Verlag 89/3(1992-03-01), 316-323 0029-8549 89:3<316 1992 89 442 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer