biomes (Sala et al., 2000), with habitat fragmentation and destruction rated as much greater threats. The steep environmental gradients from canopy to understorey in tropical forests may in part buffer populations against changes in climate. For example, specialized species of the upper canopy may move down to lower, cooler strata, although if their resources are less abundant in their new microhabitats, then extinctions are still likely (Basset et al., 2003a).
Certainly, we should not be complacent: the fact that existing examples of species responding to climate change are drawn entirely from temperate regions (e.g. Wilson et al., Chapter 11, this volume) should not be surprising, given the limited monitoring data for tropical insects. Although predicting how tropical insects will respond to a warmer world is difficult, we may at least soon be in a position to detect the ‘footprint’ of climate change without the need for long time-series of survey data: recent work suggests that short- cuts may allow changes in species’ status to be detected even from snapshot surveys (Wilson et al., 2004).
if ever, be the targets of conservation action in their own right. However, the danger is that they will be overlooked in setting conservation priorities and guiding habitat management practice. We feel that tackling the issues sur- rounding inventory, impacts and function should go a long way towards ensuring that the use of insects in conservation assessments in the trop- ics moves a step further towards reflecting their numerical and ecological importance in tropical forest ecosystems.
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Keywords: insect conservation, species recovery programmes, conservation breeding, reintroduction, Gryllus campestris,Decticus verrucivorus,Polposipus herculeanus, Motuweta isolata, Dryococelus australis, Nicrophorus americanus, Pareulype berberata,Lycaeides melissa samuelis,Motuweta isolata