Show simple item record

dc.contributor.authorSchoombie, R.
dc.contributor.authorBoardman, L.
dc.contributor.authorGroenewald, B.
dc.contributor.authorGlazier, D.
dc.contributor.authorvan Daalen, C.
dc.contributor.authorClusella Trullas, S.
dc.contributor.authorTerblanche, J.S.
dc.date.accessioned2014-02-03T11:09:26Z
dc.date.available2014-02-03T11:09:26Z
dc.date.issued2013
dc.identifier.citationSchoombie, R.E., Boardman, L., Groenewald, B., Glazier, D.S., van Daalen, C.E., Clusella-Trullas, S. and Terblanche, J.S. (2013). High metabolic and water-loss rates in caterpillar aggregations: evidence against the resource-conservation hypothesis. Journal of Experimental Biology, 216, pp 4321-4325. doi:10.1242/jeb.095554en
dc.identifier.urihttp://hdl.handle.net/123456789/1365
dc.description.abstractSeveral hypotheses have been proposed for explaining animal aggregation, including energy or water conservation. However, these physiological hypotheses have not been well investigated. Here, we report the effects of aggregation on metabolic (V· CO2) and evaporative water-loss rates (V· H2O) of the gregarious caterpillar Eutricha capensis, by comparing individuals and groups of individuals (N=10–100). Contrary to findings from previous physiological studies, we did not find an advantage to aggregation: unexpectedly, V· CO2 and V· H2O did not decrease with increasing group size. V· CO2 and V· H2O generally remained constant or increased in larger groups relative to individuals. The amount of water lost per unit of CO2 exchanged (V· H2O:V· CO2 ratio) showed a marked increase in grouped caterpillars, particularly in larger groups. Other benefits of aggregation (e.g. reduced predation or increased growth rates) likely outweigh these potential costs, because individuals of E. capensis aggregate voluntarily despite no obvious energetic or hygric advantage, and other potentially confounding group effects (e.g. increased thermoregulatory advantage or whole-animal activity) are inconsequential. The results of this study provide an important exception to physiological studies reporting enhanced energy or water conservation in animal groups.en
dc.description.sponsorshipNRF, THRIPen
dc.format.extent429325 bytes
dc.format.mimetypeapplication/pdf
dc.language.isoenen
dc.publisherCompany of Biologistsen
dc.subjectbehaviouren
dc.subjectenergeticsen
dc.titleHigh metabolic and water-loss rates in caterpillar aggregations: evidence against the resource-conservation hypothesisen
dc.typeJournalArticlesen
dc.cibjournalJournal of Experimental Biologyen
dc.cibprojectLarge-scale patterns in diversityen


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record