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|Title:||Partial migration: growth varies between resident and migratory fish|
|Citation:||Biology Letters, 2015; 11(3):20140850-1-20140850-5|
|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.|
|Appears in Collections:||Aurora harvest 7|
Earth and Environmental Sciences publications
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