Differences in early developmental rate and yolk conversion efficiency in offspring of trout with alternative life histories

Van Leeuwen, T. E., Killen, S. S. , Metcalfe, N. B. and Adams, C. E. (2016) Differences in early developmental rate and yolk conversion efficiency in offspring of trout with alternative life histories. Ecology of Freshwater Fish, 26(3), pp. 371-382. (doi: 10.1111/eff.12281)

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Partial migration, in which some individuals of a population migrate while other individuals remain resident, is generally associated with ontogenetic shifts to better feeding areas or as a response to environmental instability, but its underlying mechanisms remain relatively unknown. Brown trout (Salmo trutta) exhibit partial migration, with some individuals remaining in fresh water (freshwater-resident) while others undertake an anadromous migration, where they spend time at sea before returning to breed in fresh water (migrant). We reared full-sibling groups of offspring from freshwater-resident and anadromous brown trout from the same catchment in the laboratory under common garden conditions to examine potential differences in their early development. Freshwater-resident parents produced eggs that were slower to hatch than those of anadromous parents, but freshwater-resident offspring were quicker to absorb their yolk and reach the stage of exogenous feeding. Their offspring also had a higher conversion efficiency from the egg stage to the start of exogenous feeding (so were larger by the start of the fry stage) than did offspring from anadromous parents despite no difference in standard metabolic rate, maximal metabolic rate, or aerobic scope. Given these differences in early development we discuss how the migration history of the parents might influence the migration probability of the offspring.

Item Type:Articles
Additional Information:TEVL was funded by the EU Interreg IVA Programme project 2859 ‘IBIS’ and a NSERC PGS-D3 grant, NBM was funded by ERC Advanced Grant 322784 and SSK by NERC Advanced Fellowship NE/J019100/1.
Glasgow Author(s) Enlighten ID:Killen, Professor Shaun and Van Leeuwen, Dr Travis and Metcalfe, Professor Neil and Adams, Professor Colin
Authors: Van Leeuwen, T. E., Killen, S. S., Metcalfe, N. B., and Adams, C. E.
College/School:College of Medical Veterinary and Life Sciences > Institute of Biodiversity Animal Health and Comparative Medicine
Journal Name:Ecology of Freshwater Fish
ISSN (Online):1600-0633
Published Online:16 March 2016
Copyright Holders:Copyright © 2016 The Authors
First Published:First published in Ecology of Freshwater Fish 26(3):371-382
Publisher Policy:Reproduced under a Creative Commons License

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
594261The Influence of Individual Physiology on Group Behaviour in Fish SchoolsShaun KillenNatural Environment Research Council (NERC)NE/J019100/1RI BIODIVERSITY ANIMAL HEALTH & COMPMED