The number of larval instars in the flax weevil (Anagotus fairburni) (Coleoptera: Curculionidae)

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dc.citation.volumeLatest Articles
dc.contributor.authorBrockelsby WD
dc.contributor.authorMiskelly CM
dc.contributor.authorGlare TR
dc.contributor.authorMinor MA
dc.date.accessioned2024-12-02T22:35:54Z
dc.date.available2024-12-02T22:35:54Z
dc.date.issued2023-09-20
dc.description.abstractThe flax weevil Anagotus fairburni is a large flightless beetle, that is one of the members of the endemic insect ‘megafauna’ of New Zealand. It is a protected species that currently persists only on predator-free islands or in remote and difficult to access alpine areas. Little is documented about the ecology of the flax weevil. In this study we estimated the number of instars in the A. fairburni life cycle by measuring the head capsule widths of larvae collected in the field on Mana Island Scientific Reserve. We used kernel density function estimates to predict average head-capsule widths and the number of larval instars. We then used Brooks-Dyar’s law on the head capsule width data and analysed Brooks and Crosby indexes to refine the estimated number of instars based on imperfect data. Results from sampling of 86 larvae suggested four instar groupings, but further analysis based on Brooks-Dyar’s law found that A. fairburni likely passes through 6 or 7 larval stages prior to pupation, with some uncertainty for smaller instars. Our method provides new data on ecology of an endemic species and provides a framework for further work on similar endangered species where data is imperfect or difficult to gather.
dc.description.confidentialfalse
dc.edition.edition2023
dc.format.pagination1-11
dc.identifier.citationBrockelsby WD, Miskelly CM, Glare TR, Minor MA. (2023). The number of larval instars in the flax weevil (Anagotus fairburni) (Coleoptera: Curculionidae). New Zealand Journal of Zoology. Latest Articles. (pp. 1-11).
dc.identifier.doi10.1080/03014223.2023.2251898
dc.identifier.eissn1175-8821
dc.identifier.elements-typejournal-article
dc.identifier.issn0301-4223
dc.identifier.urihttps://mro.massey.ac.nz/handle/10179/72153
dc.languageEnglish
dc.publisherPublished by Informa UK Limited, trading as Taylor & Francis Group
dc.publisher.urihttps://www.tandfonline.com/doi/full/10.1080/03014223.2023.2251898
dc.relation.isPartOfNew Zealand Journal of Zoology
dc.rights(c) 2023 The Author/s
dc.rightsCC BY 4.0
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subjectDevelopment
dc.subjectlarval stages
dc.subjectBrooks-Dyar
dc.subjectsoil insect
dc.subjectinvertebrate conservation
dc.titleThe number of larval instars in the flax weevil (Anagotus fairburni) (Coleoptera: Curculionidae)
dc.typeJournal article
pubs.elements-id480628
pubs.organisational-groupOther
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