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Growth trajectory influences temperature preference in fish through an effect on metabolic rate.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Killen, Shaun S.
Spatial Coverage	Scotland
Description	Country affiliation: United kingdom Author Affiliation: Killen SS ( Institute of Biodiversity, Animal Health & Comparative Medicine, Graham Kerr Building, College of Medical, Veterinary & Life Sciences, University of Glasgow, Glasgow, G12 8QQ, UK.)
Abstract	Most animals experience temperature variations as they move through the environment. For ectotherms, in particular, temperature has a strong influence on habitat choice. While well studied at the species level, less is known about factors affecting the preferred temperature of individuals; especially lacking is information on how physiological traits are linked to thermal preference and whether such relationships are affected by factors such feeding history and growth trajectory. This study examined these issues in the common minnow Phoxinus phoxinus, to determine the extent to which feeding history, standard metabolic rate (SMR) and aerobic scope (AS), interact to affect temperature preference. Individuals were either: 1) food deprived (FD) for 21 days, then fed ad libitum for the next 74 days; or 2) fed ad libitum throughout the entire period. All animals were then allowed to select preferred temperatures using a shuttle-box, and then measured for SMR and AS at 10 °C, estimated by rates of oxygen uptake. Activity within the shuttle-box under a constant temperature regime was also measured. In both FD and control fish, SMR was negatively correlated with preferred temperature. The SMR of the FD fish was increased compared with the controls, probably due to the effects of compensatory growth, and so these growth-compensated fish preferred temperatures that were on average 2.85 °C cooler than controls fed a maintenance ration throughout the study. Fish experiencing compensatory growth also displayed a large reduction in activity. In growth-compensated fish and controls, activity measured at 10 °C was positively correlated with preferred temperature. Individual fish prefer temperatures that vary predictably with SMR and activity level, which are both plastic in response to feeding history and growth trajectories. Cooler temperatures probably allow individuals to reduce maintenance costs and divert more energy towards growth. A reduction in SMR at cooler temperatures, coupled with a decrease in spontaneous activity, could also allow individuals to increase surplus AS for coping with environmental stressors. In warming climates, however, aquatic ectotherms could experience frequent fluctuations in food supply with long-lasting effects on metabolic rate due to compensatory growth, while simultaneously having limited access to preferred cooler habitats.
File Format	HTM / HTML
ISSN	00218790
e-ISSN	13652656
DOI	10.1111/1365-2656.12244
Journal	Journal of Animal Ecology
Issue Number	6
Volume Number	83
Language	English
Publisher	Wiley-Blackwell
Publisher Date	2014-11-01
Publisher Place	Great Britain (UK)
Access Restriction	Open
Subject Keyword	Discipline Environmental Health Discipline Zoology Cyprinidae Physiology Energy Metabolism Animals Basal Metabolism Growth & Development Food Deprivation Oxidation-reduction Scotland Temperature Research Support, Non-u.s. Gov't
Content Type	Text
Resource Type	Article
Subject	Animal Science and Zoology Ecology, Evolution, Behavior and Systematics

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Growth trajectory influences temperature preference in fish through an effect on metabolic rate

Data from: Growth trajectory influences temperature preference in fish through an effect on metabolic rate (Dataset)

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Growth trajectory influences temperature preference in fish through an effect on metabolic rate.

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Growth trajectory influences temperature preference in fish through an effect on metabolic rate

Data from: Growth trajectory influences temperature preference in fish through an effect on metabolic rate (Dataset)

Flexibility in metabolic rate confers a growth advantage under changing food availability.

Acclimatization of seasonal energetics in northern cardinals (Cardinalis cardinalis) through plasticity of metabolic rates and ceilings.

Spatial variation in the relationship between performance and metabolic rate in wild juvenile Atlantic salmon.

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Growth trajectory influences temperature preference in fish through an effect on metabolic rate.