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https://hdl.handle.net/2440/100875
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Type: | Journal article |
Title: | Partial migration: growth varies between resident and migratory fish |
Author: | Gillanders, B. Izzo, C. Doubleday, Z. Ye, Q. |
Citation: | Biology Letters, 2015; 11(3):20140850-1-20140850-5 |
Publisher: | Royal Society |
Issue Date: | 2015 |
ISSN: | 1744-9561 1744-957X |
Statement of Responsibility: | Bronwyn M. Gillanders, Christopher Izzo, Zoë A. Doubleday and Qifeng Ye |
Abstract: | Partial migration occurs in many taxa and ecosystems and may confer survival benefits. Here, we use otolith chemistry data to determine whether fish from a large estuarine system were resident or migratory, and then examine whether contingents display differences in modelled growth based on changes in width of otolith growth increments. Sixty-three per cent of fish were resident based on Ba:Ca of otoliths, with the remainder categorized as migratory, with both contingents distributed across most age/size classes and both sexes, suggesting population-level bet hedging. Migrant fish were in slightly better condition than resident fish based on Fulton's K condition index. Migration type (resident versus migratory) was 56 times more likely to explain variation in growth than a model just incorporating year- and age-related growth trends. While average growth only varied slightly between resident and migratory fish, year-to-year variation was significant. Such dynamism in growth rates likely drives persistence of both life-history types. The complex relationships in growth between contingents suggest that management of species exhibiting partial migration is challenging, especially in a world subject to a changing climate. |
Keywords: | Migration; residency; partial migration; fish; otolith chemistry; otolith growth |
Rights: | © 2015 The Author(s) Published by the Royal Society. All rights reserved. |
DOI: | 10.1098/rsbl.2014.0850 |
Grant ID: | ARC |
Published version: | http://dx.doi.org/10.1098/rsbl.2014.0850 |
Appears in Collections: | Aurora harvest 7 Earth and Environmental Sciences publications |
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