Title

An emergence study of Petalura gigantea (Odonata: Petaluridae)

Date of this Version

7-15-2013

Document Type

Journal Article

Publication Details

Citation only

Baird, I.R.C. & Burgin, S. (2013). An emergence study of Petalura gigantea (Odonata: Petaluridae), International Journal of Odonatology, 16(3), 193-211

Access the journal

2013 HERDC submission. FoR code: 050205

© 2013 Worldwide Dragonfly Association

ISSN

1388-7890

Abstract

Emergence studies in Odonata provide information on the behaviour, ecology and fundamental demographic parameters in population studies. This paper reports on a study of sex ratio at emergence, pattern and duration of the emergence season, and potential cohort splitting in Petalura gigantea. Sex ratio at emergence varied among years, habitat patches and swamp types. Across all collections, sex ratio varied significantly from a 1:1 ratio, with a bias towards females. The duration of the emergence season varied between sites and years, from at least 45 to at least 70 days, potentially commencing by late October and extending into early January and possibly beyond. Although some evidence suggested cohort splitting, it was not confirmed. Observations of spatially and temporally aggregated emergence clusters are consistent with observed oviposition patterns of individual females, suggesting cohort emergence. Observations of mortalities at emergence and of emergence location are provided; the latter should assist researchers and resource managers in identifying breeding sites in heterogeneous swamp vegetation.Emergence studies in Odonata provide information on the behaviour, ecology and fundamental demographic parameters in population studies. This paper reports on a study of sex ratio at emergence, pattern and duration of the emergence season, and potential cohort sphtting in Petalura gigantea. Sex ratio at emergence varied among years, habitat patches and swamp types. Across all collections, sex ratio varied significantly from a 1:1 ratio, with a bias towards females. The duration of the emergence season varied between sites and years, from at least 45 to at least 70 days, potentially commencing by late October and extending into early January and possibly beyond. Although some evidence suggested cohort splitting, it was not confirmed. Observations of spatially and temporally aggregated emergence clusters are consistent with observed oviposition patterns of individual females, suggesting cohort emergence. Observations of mortalities at emergence and of emergence location are provided; the latter should assist researchers and resource managers in identifying breeding sites in heterogeneous swamp vegetation.

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This document has been peer reviewed.