caa a22 4500 388035900 CHVBK 20180307125004.0 cr unu---uuuuu 161130e199812 xx s 000 0 eng 10.1017/S0007485300054316 doi S0007485300054316 pii (NATIONALLICENCE)cambridge-10.1017/S0007485300054316 Changes in eucalypt architecture and the foraging behaviour and development of Amorbus obscuricornis (Hemiptera: Coreidae) [Elektronische Daten] Field surveys, manipulative field experiments and laboratory studies were employed to study the behaviour and development of a large coreid, Amorbus obscuricornis (Westwood), in response to changes in the architecture/foliar quality of Eucalyptus (Myrtaceae) hosts in Tasmania, Australia. Following tree decapitation and subsequent regrowth, A. obscuricornis nymphs were only associated with coppiced hosts. Eucalypts coppiced naturally by wild fire were found to carry significantly more nymphs than non-coppiced conspecific hosts. In contrast, adult A. obscuricornis were found on both coppiced and non-coppiced hosts. The foliar quality of coppiced hosts was superior to that of non-coppiced hosts; being softer, having a higher moisture content and a lower C/N ratio. Field collected fifth instar nymphs were heavier when collected from coppice vs. noncoppice; but in bagged shoot experiments second instar nymphs gained less weight on coppice than non-coppice. It is suggested that because coppice is softer the shoots may deteriorate (i.e. wilt) more quickly than non-coppice shoots. Through different exposure regimes, it was confirmed that first instar nymphs need only water to ecdyse, while feeding is initiated in the second instar. Differences in the nutritional requirements of first and second instar nymphs were reflected in their behaviour. First instar nymphs did not discriminate between conspecific hosts on the basis of whether they were coppiced or not, whereas second instar nymphs preferentially chose coppiced conspecific hosts. The findings of this work are discussed in the context of the plant vigour and resource regulation hypotheses. Copyright © Cambridge University Press 1998 Steinbauer MJ Co-operative Research Centre for Sustainable Production Forestry, Hobart, Australia Clarke A.R. Department of Entomology, The University of Queensland, Brisbane, Australia Paterson S.C. Co-operative Research Centre for Sustainable Production Forestry, Hobart, Australia Bulletin of Entomological Research Cambridge University Press 88/6(1998-12), 641-651 0007-4853 88:6<641 1998 88 BER https://doi.org/10.1017/S0007485300054316 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1017/S0007485300054316 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Steinbauer MJ Co-operative Research Centre for Sustainable Production Forestry, Hobart, Australia NATIONALLICENCE 700 1- Clarke A.R. Department of Entomology, The University of Queensland, Brisbane, Australia NATIONALLICENCE 700 1- Paterson S.C. Co-operative Research Centre for Sustainable Production Forestry, Hobart, Australia NATIONALLICENCE 773 0- Bulletin of Entomological Research Cambridge University Press 88/6(1998-12), 641-651 0007-4853 88:6<641 1998 88 BER CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge