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dc.contributor.authorBrown, Matthewen_NZ
dc.contributor.authorGemmill, Chrissen E.C.en_NZ
dc.contributor.authorMiller, Steven D.en_NZ
dc.contributor.authorWehi, Priscilla M.en_NZ
dc.date.accessioned2018-02-06T23:41:52Z
dc.date.available2018en_NZ
dc.date.available2018-02-06T23:41:52Z
dc.date.issued2018en_NZ
dc.identifier.citationBrown, M., Gemmill, C. E. C., Miller, S. D., & Wehi, P. M. (2018). Diet selectivity in a terrestrial forest invertebrate, the Auckland tree wētā, across three habitat zones. Ecology and Evolution. https://doi.org/10.1002/ece3.3763en
dc.identifier.issn2045-7758en_NZ
dc.identifier.urihttps://hdl.handle.net/10289/11627
dc.description.abstractInsects are important but overlooked components of forest ecosystems of New Zealand. For many invertebrate species, information on foraging patterns and trophic relationships is lacking. We examined diet composition and selectivity in a large bodied invertebrate, the Auckland tree wētā, in three habitat zones in a lowland New Zealand forest. We asked if Hemideina thoracica selectively forage from available plant food sources, and if these choices were lipid-rich compared to non-preferred available plants. We also identified the proportion of invertebrates in their frass as a proxy for omnivory. From reconnaissance plot sampling, together with faecal fragment analysis, we report that more than 93% of individual wētā had eaten other invertebrates before capture. Wētā in the highest elevation hillslope habitat consumed significantly fewer plants on average than wētā on either the low elevation terrace or mid-slope habitat. Hillslope wētā also had the highest average number of invertebrate fragments in their frass, significantly more than wētā in the low elevation terrace habitat. Wētā showed high variability in the consumption of fruit and seeds across all habitats. Generally, we did not observe diet differences between the sexes (although it appears that male wētā in the mid hillslope habitat ate fruits and seeds more voraciously than females), suggesting that the sexes have similar niche breadths and display similar degrees of omnivorous behaviour. Extraction of leaf lipids demonstrated a range of lipid content values in available plants, and Ivlev’s electivity index indicated that plant species which demonstrated high electivity, tended to have higher concentrations of lipids in their leaves. Our findings indicate that H. thoracica forage omnivorously and selectively, and hence play multiple roles in native ecosystems and food webs.en_NZ
dc.format.mimetypeapplication/pdf
dc.language.isoen
dc.publisherWileyen_NZ
dc.rightsThis is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. © 2018 The Authors. Ecology and Evolution published by John Wiley & Sons Ltd.
dc.subjectfeeding behaviouren_NZ
dc.subjectHemideina thoracica
dc.subjectinsect
dc.subjectlipids
dc.subjectnutrition
dc.subjectprotein
dc.subjectselective foraging
dc.titleDiet selectivity in a terrestrial forest invertebrate, the Auckland tree wētā, across three habitat zones.en_NZ
dc.typeJournal Article
dc.identifier.doi10.1002/ece3.3763en_NZ
dc.relation.isPartOfEcology and Evolutionen_NZ
pubs.elements-id215677
pubs.publication-statusAccepteden_NZ


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