Rapid larval growth predisposes sex change and sexual size dimorphism in a protogynous hermaphrodite, Parapercis snyderi Jordan & Starks 1905

Walker, S.P.W., Ryen, C.A., and McCormick, M.I. (2007) Rapid larval growth predisposes sex change and sexual size dimorphism in a protogynous hermaphrodite, Parapercis snyderi Jordan & Starks 1905. Journal of Fish Biology, 71 (5). pp. 1347-1357.

[img] PDF (Published Version) - Published Version
Restricted to Repository staff only

View at Publisher Website: http://dx.doi.org/10.1111/j.1095-8649.20...
 
19
4


Abstract

The temporal relationship between growth history, sex-specific growth divergence and sex change was investigated in the haremic sandperch Parapercis snyderi using otolith microstructure and gonad histology. Parapercis synderi was found to display rapid near-linear growth with a maximum longevity of 303 days. All individuals matured first as female and later changed sex to become male (monandric protogynous hermaphroditism). Individual age-based growth histories obtained from otolith increment widths illustrated that males were larger than females at any given age. Males were found to diverge from the female growth trajectory during two ontogenetic periods; during the larval period and during the period that sex change took place. In addition, male otoliths contained a discontinuity, or 'check mark', associated with the rapid increase in otolith growth during the sex-change period. This microstructural feature was absent from all female otoliths. Accelerated growth in male otoliths lasted up to 25 days, following check-mark formation, after which time otolith growth returned to the pre-check-mark rate. Given the isometric relationship between otolith and somatic growth in P. synderi, and the temporal relationship between the time of check-mark formation and gonad condition, these results strongly suggest that individuals accelerate somatic growth during sex change to become the largest members of the population. Moreover, evidence suggests that the factors that determine the initial growth of larvae influence which individuals will later become males and achieve the highest reproductive success.

Item ID: 2178
Item Type: Article (Research - C1)
ISSN: 1095-8649
Keywords: growth acceleration; otolith; otolith check; Parapercis snyderi; protogyny; sex change
Date Deposited: 28 May 2009 01:17
FoR Codes: 06 BIOLOGICAL SCIENCES > 0602 Ecology > 060205 Marine and Estuarine Ecology (incl Marine Ichthyology) @ 100%
SEO Codes: 83 ANIMAL PRODUCTION AND ANIMAL PRIMARY PRODUCTS > 8399 Other Animal Production and Animal Primary Products > 839999 Animal Production and Animal Primary Products not elsewhere classified @ 100%
Downloads: Total: 4
More Statistics

Actions (Repository Staff Only)

Item Control Page Item Control Page