Dataset 785
Stream fish monitoring data in protected watersheds in Hokkaido, Japan
Realm: Freshwater
Climate: Temperate
Biome: Small river ecosystems Central latitude: 43.300000
Central longitude: 142.300000
Duration: 21 years, from 1999 to 2019
Climate: Temperate
Biome: Small river ecosystems Central latitude: 43.300000
Central longitude: 142.300000
Duration: 21 years, from 1999 to 2019
3729 records
33 distinct species
Across the time series Oncorhynchus masou is the most frequently occurring speciesMethods
We assembled time-series fish data at 126 sites within 32 protected watersheds of Hokkaido Island, Japan. The Hokkaido Research Organization leads a long-term monitoring program at these watersheds, and the data are published as annual reports (60). The program began in 1963, but an effective, standardized sampling method has been implemented since 1999; at all sampling sites, a combination of electrofishing and cast net (two-pass) was used to effectively catch both benthic and water-column species (SI Appendix, Text). Most data were collected in summer with irregular interannual intervals (1- to 3-y intervals for most cases), and sampling efforts were quantified by sampling area (average: 175.49 ± 115.91 m2.” The monitoring program employed a two-pass sampling method at all sampling sites. In each pass, a combination of electrofishing and cast net was used to effectively catch both benthic and water-column species in a given area. The number of cast-net throws was determined as the sampled area divided by 4.5 m2 (the area covered by a cast net). Thus, this sampling method has a constant sampling effort per unit area across sites.”[extracted from Terui et al., 2023 (see metaDataCitations)]. Additional: Throughout the series, sites were sampled during 2 hours in the daytime (9:00 - 15:00) between late July to middle August. The grain size indicated is the average sampling area, which varied by site and year. Abundance is density of individuals/100m2.Citation(s)
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