EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
MARCH 2-5, 2021
(Virtually the same conference, without elevators, airplane tickets, or hotel room keys)
5/21/2019 | 9:15 AM - 9:30 AM | RESPONSES OF STREAM INVERTEBRATE AND FISH ASSEMBLAGES TO AN EXTREME FLOOD EVENT IN A JAPANESE RIVER | 254 B
RESPONSES OF STREAM INVERTEBRATE AND FISH ASSEMBLAGES TO AN EXTREME FLOOD EVENT IN A JAPANESE RIVER
Ongoing climate change is causing the frequent occurrence of massive floods worldwide. However, there is limited information on the impact of such extreme flood disturbances on lotic organisms owing to its rarity of occurrence and thus the difficulty in observation. In September 2017, an unprecedented flood occurred in the Shigenobu River on Sikoku Island, southwestern Japan. We report the changes in invertebrate and fish assemblages caused by the extreme flood based on a rare dataset obtained just before and after the peak flow. We also compared the response of the assemblages among four representative channel unit types in a targeted river segment. We observed significant decrease in invertebrate density and taxon richness after the flood. In contrast, fish abundance decreased in riffles and rather increased in backwater habitat. Analyses of the individual species showed the aggregation of pale chub at backwaters after the flood, implying that such semi-lentic habitats serve as a flow refugia for water-column fishes during high flow. Consequently, we showed strong impacts of an extreme flood event on invertebrate and fish assemblages, and that the effects differed between these taxa and between channel unit types.
- Flood
- Invertebrate
- Fish
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Presenters/Authors
Kosuke Sumida
(), Ehime University, sumida.kohsuke.14@cee.ehime-u.ac.jp;
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Yo Miyake
(), Ehime University, yomiyakejapan@gmail.com;
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Yuya Watanabe
(), Fujita Construction Consultant, yuya-watanabe@fujitacc.co.jp;
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Mikio Inoue
(), Ehime University, inom@sci.ehime-u.ac.jp;
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