caa a22 4500 38809320X CHVBK 20180307125257.0 cr unu---uuuuu 161130e199910 xx s 000 0 eng 10.4039/Ent131659-5 doi S0008347X00010269 pii (NATIONALLICENCE)cambridge-10.4039/Ent131659-5 Carroll Allan L. Atlantic Forestry Centre, Canadian Forest Service, PO Box 960, Corner Brook, Newfoundland, Canada A2H 653 PHYSIOLOGICAL ADAPTATION TO TEMPORAL VARIATION IN CONIFER FOLIAGE BY A CATERPILLAR [Elektronische Daten] [Allan L. Carroll] Larvae of the hemlock looper, Lambdina fiscellaria fiscellaria (Guenée) (Lepidoptere: Geometridae), consume both new and old foliage within the crowns of their host, balsam fir, Abies balsamea (L.) Miller (Pinaceae), despite the poor nutritional quality generally ascribed to old tissues. Laboratory studies evaluated whether the consumption of old foliage by hemlock looper larvae could be an adaptation to the relative paucity of new versus old foliage, and to the limited temporal window during which young foliage remains high in nutritional quality. Access to new foliage was critical to hemlock looper survival; 55% of larvae fed an exclusive diet of new foliage survived, whereas only 5% and 0% of larvae fed exclusively 1-or 2-year-old foliage survived, respectively. Moreover, larvae reared on branches in synchrony with bud flush were more than twice as likely to survive than those whose emergence was delayed by 2 weeks. Despite the reliance by the hemlock looper upon new foliage for survival, larvae given access to both new and old foliage survived better and were heavier than those restricted to new foliage. By incorporating older foliage into their diet, the hemlock looper can circumvent the limited availability of new foliage, thereby gaining access to more abundant tissues. Copyright © Entomological Society of Canada 1999 The Canadian Entomologist Cambridge University Press 131/5(1999-10), 659-669 0008-347X 131:5<659 1999 131 TCE https://doi.org/10.4039/Ent131659-5 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.4039/Ent131659-5 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Carroll Allan L. Atlantic Forestry Centre, Canadian Forest Service, PO Box 960, Corner Brook, Newfoundland, Canada A2H 653 NATIONALLICENCE 773 0- The Canadian Entomologist Cambridge University Press 131/5(1999-10), 659-669 0008-347X 131:5<659 1999 131 TCE CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge