Morphological evolution reduces downstream displacement in juvenile landlocked salmon
| Autor: | Hiroyuki Yamada, Satoshi Wada |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
0106 biological sciences
0301 basic medicine Oncorhynchus 010603 evolutionary biology 01 natural sciences Gene flow 03 medical and health sciences Rivers Downstream (manufacturing) Salmon Genetics Animals Humans Juvenile Ecosystem Ecology Evolution Behavior and Systematics biology Ecology Flooding (psychology) Aquatic animal biology.organism_classification 030104 developmental biology Habitat General Agricultural and Biological Sciences Displacement (fluid) Salmonidae |
| Zdroj: | Evolution. 75:1850-1861 |
| ISSN: | 1558-5646 0014-3820 |
| Popis: | Severe flooding often leads to downstream displacement of aquatic animals. Despite this, many salmonid populations persist in habitats located upstream of tall barriers, such as artificial check dams and/or natural waterfalls, that completely block fishes from returning to the upstream areas after flooding. The evolution of such populations may be affected by spatial sorting due to differential rates of downstream displacement. This study examined whether a morphological trait (increased body depth) that allows individuals to better maintain their position during flooding has evolved in juvenile amago salmon Oncorhynchus masou ishikawae inhabiting above-barrier habitats in two rivers. In both rivers, juveniles collected at the stations with multiple downstream barriers had deeper bodies than those collected at other stations. Similar differences were found in juveniles reared in a common-garden experiment. Field experiments with natural flooding also indicated that deep bodies help juveniles resist downstream displacement. These results consistently suggest that juveniles in some above-barrier habitats have evolved deep bodies to resist downstream displacement due to flooding. Our study is the first to show the evolutionary outcomes of passive spatial sorting during severe climate events. |
| Databáze: | OpenAIRE |
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