Seasonal ecosystem linkages contribute to the maintenance of migratory polymorphism in a salmonid population

被引:3
|
作者
Tanaka, Tatsuya [1 ]
Ueda, Rui [1 ]
Sato, Takuya [1 ,2 ]
机构
[1] Kobe Univ, Grad Sch Sci, Dept Biol, 1-1 Rokkodai,Nada Ku, Kobe 6578501, Japan
[2] Kyoto Univ, Ctr Ecol Res, Hirano 2-509 3, Otsu, Shiga 5202113, Japan
关键词
resource subsidy; partial migration; status-dependent strategy; salmonid; seasonality; ATLANTIC SALMON; REARING DENSITY; TERRESTRIAL; GROWTH; PERFORMANCE; DOMINANCE; SUBSIDIES; STRATEGIES; PHENOTYPES; EVOLUTION;
D O I
10.1098/rspb.2023.0126
中图分类号
Q [生物科学];
学科分类号
07 ; 0710 ; 09 ;
摘要
The influence of resource subsidies on animal growth, survival and reproduction is well understood, but their ultimate effects on life history have been less explored. Some wild species have a partially migratory life history, wherein migration is dictated based upon threshold traits regulated in part by the seasonal availability of resources. We conducted a large-scale field manipulation experiment where we provided a terrestrial invertebrate subsidy to red-spotted masu salmon. Individuals in stream reaches that received a subsidy had, on average, a 53% increase in growth rate relative to those in control reaches. This increased growth resulted in a greater proportion of individuals reaching the threshold body size and smolting in the autumn. Consequently, 19-55% of females in subsidized reaches became migratory, whereas 0-14% became migratory in the control reaches. Our findings highlight seasonal ecosystem linkage as a key ecosystem property for maintaining migratory polymorphism in partially migratory animals.
引用
收藏
页数:9
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