2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

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5/25/2021 | 8:30 AM - 10:30 AM | Spatially variable hydrological and biological processes shape diverse post-flood aquatic communities in Hokkaido, Japan | Virtual Platform

Spatially variable hydrological and biological processes shape diverse post-flood aquatic communities in Hokkaido, Japan

Diverse aquatic communities occur in floodplains, which harbor habitats with varying degrees of hydrological connectivity to the mainstream channel. In this study, we test a hypothesis that four faunal groups (plankton, benthos, fish, and amphibian) respond uniquely to hydrological sequences during a post-flood period, and as a whole form diverse aquatic communities along the hydrological connectivity gradient. To examine the processes that aquatic communities are shaped in each waterbody, we conducted repeated surveys over the flood recession period and broad spatial survey after the cessation of flood. Each faunal group responded differently to the hydrological dynamics over the flood recession period to explain the patterns of habitat segregation in a floodplain. Plankton was reduced by the flow at flood peak. Salmonid fishes were more abundant in waterbodies which were hydrologically connected to the mainstream at flood peak. The amphibian eggs were laid in waterbodies that had still-water at their breeding timing. The benthic composition was influenced by the existence of the flow at the time of sampling. Overall, aquatic biota shifted from isolated ponds to more connected waterbodies to the river, a mechanism supporting diverse aquatic communities in a floodplain.

Biodiversity
Ecohydrology
Habitat

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Presenters/Authors

Hiromi Uno (), Center for Ecological Research, Kyoto University, hiromiuno1@gmail.com;