Abstract
We monitored the abundance of a non-native (Rhinogobius sp. OR) and two native stream gobies (R. fluviatilis and R. nagoyae) over a decade, from 1995 to 2004, in a fixed reach of a tributary of the Kamo River, southwestern Japan. The non-native Rhinogobius sp. OR appeared and reproduced in 1997, when an increased deposition of fine sediments occurred. However, after a severe spate in 1999, the non-native goby almost completely disappeared from the study reach, while the density of the native R. fluviatilis increased. The severe spate is likely to have prevented the establishment of the non-native goby. Our results provide an example of abiotic barriers to invasion.
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Acknowledgements
We would like to thank Okuda N, Yanagisawa Y for discussion, Shimizu T and Mizuno N for helpful information and advice, Matsuhana M and Ito M for assistance during data collection, and Kudo S, Kudo T, Miura M, Matsumoto K and other members of the Kamogawa Fishermen’s Union for providing their facilities and kindness. This study was supported by the River Environment Fund (REF: 16-1-(4)-33) in charge of the Foundation of River and Watershed Environment Management (FOREM), Japan, and by grants from the 21st Century COE program of the Center for Marine Environmental Studies, Ehime University, Japan.
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10228_2021_819_MOESM1_ESM.pptx
Supplementary file1. S1 Location map of the study reach. The star indicates the study site. S2 Maximum daily (column) and total (solid circle) precipitation during the rainy season (June and July) from 1995 to 2004. Data are from the ‘Jyojyusha’ meteorological station (Japan Meteorological Agency), located at the head water catchment of the Kamo River (PPTX 1164 KB)
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Ito, S., Tamura, Y., Sato, A. et al. Occurrence and disappearance of a non-native goby Rhinogobius sp. OR in relation to hydrological conditions in the Kamo River, southwestern Japan. Ichthyol Res 69, 176–181 (2022). https://doi.org/10.1007/s10228-021-00819-0
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DOI: https://doi.org/10.1007/s10228-021-00819-0