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Sex-ratio bias in Laevistrombus canarium Linné, 1958 (Gastropoda: Strombidae) from Far North Queensland, Australia

Title

Sex-ratio bias in Laevistrombus canarium Linné, 1958 (Gastropoda: Strombidae) from Far North Queensland Australia (1101 KB) pdf document icon

Author/s

Maxwell, S.J., Rymer, T.L. & Congdon, B.C.

Citation

Maxwell, S.J., Rymer, T.L. & Congdon, B.C. 2017. Sex-ratio bias in Laevistrombus canarium Linné, 1958 (Gastropoda: Strombidae) from Far North Queensland, Australia. Memoirs of the Queensland Museum - Nature 60: 133–138. https://dx.doi.org/10.17082/j.2204-1478.60.2017.2016-15

Accepted Accepted 17 February 2017
Published online 13 June 2017
Peer reviewed:

Yes

DOI

https://dx.doi.org/10.17082/j.2204-1478.60.2017.2016-15

Keywords Life history, Phylogenetic constraints, Sampling effort, Sex imbalance

Abstract

In general, sex-ratios in herbivorous gastropods show a strong female bias, particularly in the family Strombidae of the Indo-Pacific. Previous studies of Indo-Pacific strombs point to an underlying
female bias in most species. However, the full spatial extent and potential mechanisms driving this phenomenon are currently unknown. Therefore, we studied two populations of Laevistrombus
canarium
Linné, 1758 over a four year period to explore sex-ratio bias and to investigate the underlying mechanisms. Furthermore, the current study investigated methods to test for sex-ratio
bias in strombs where samples are limited and sampling is problematic We sampled individuals from two reefs in Far North Queensland, Australia, with different benthic compositions, despite
their close proximity (approximately 4 km apart). In agreement with previous studies, we also found a strong bias towards females. This bias remained consistent across both locations and
changes in benthic substrate. Our findings are consistent with models suggesting inherent genetic factors regulate natural patterns of sex imbalance in these strombs. These findings also suggest
that there are as yet unidentified stromb life-history characteristics associated with the origin and maintenance of this phenomenon