NDLI: Temperature-dependent variation in alternative migratory tactics and its implications for fitness and population dynamics in a salmonid fish.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Morita, Kentaro Tamate, Tsuyoshi Kuroki, Mari Nagasawa, Toru
Spatial Coverage	Japan
Description	Country affiliation: Japan Author Affiliation: Morita K ( Hokkaido National Fisheries Research Institute, Fisheries Research Agency, 2-2 Nakanoshima, Toyohira-ku, Sapporo, Japan.); Tamate T ( Tohoku National Fisheries Research Institute, Fisheries Research Agency, 3-27-5 Shinhama-cho, Shiogama, Japan.); Kuroki M ( Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo, Tokyo, Japan.); Nagasawa T ( Hokkaido National Fisheries Research Institute, Fisheries Research Agency, 2-2 Nakanoshima, Toyohira-ku, Sapporo, Japan.)
Abstract	Temperature-driven life-history modifications by adaptation occur in ectotherms, and therefore, life-history modifications by adaptation need to be taken into consideration when predicting population responses to the climate change. Partial migration is a common form of life-history diversity in which a population contains both migratory and resident behaviours. Salmonid fish exhibit a wide range of life-history diversity and, in particular, partial migration. We evaluated the effect of temperature-driven life-history modifications on population dynamics in partially migratory masu salmon (Oncorhynchus masou) by field observations and theoretical models. Field observations revealed that spatial patterns of alternative migratory tactics were associated with temperature gradients. The occurrence of resident males increased, whereas the proportion of migrant males and the proportion of delayed migrants including both sexes decreased with increasing temperature and, thereby, with improved early growth conditions. The expected fitness for each migratory tactic was computed in a life-history model with early growth conditions as a function. Individual fitness was maximized by adopting resident tactics under favourable early growth conditions, early migrant tactics under intermediate early growth conditions and delayed migrant tactics under unfavourable early growth conditions. The results suggest that individuals exhibited a status-dependent conditional strategy, that is, the adoption of alternative migratory tactics is influenced by the status of individuals to make the best of a situation. A simulation model suggests that increased residency by males to increased temperature leads to a substantial decrease in the number of migrants. Moreover, the decrease in the number of delayed (older) migrants with increasing temperature magnified fluctuations in abundance. Our findings indicate the importance of temperature-driven life-history modifications for predicting dynamics of natural populations under climate warming.
File Format	HTM / HTML
ISSN	00218790
e-ISSN	13652656
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	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Environmental Health Discipline Zoology Animal Migration Climate Change Genetic Fitness Oncorhynchus Physiology Adaptation, Biological Animals Hot Temperature Models, Biological Population Dynamics Spatial Analysis 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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