River bed features affect the riverine distribution of two amphidromous Rhinogobius species
2011
Tamada, K.
Tamada K. River bed features affect the riverine distribution of two amphidromous Rhinogobius species. Ecology of Freshwater Fish 2011: 20: 23-32. © 2010 John Wiley & Sons A/S Abstract - Nest-use patterns of two amphidromous gobies, Rhinogobius sp. LD (large dark type) and CB (cross-band type), were studied along the course of the Aizu River, Japan. Males of both species build and defend nests under stones. Adult distributions of the two gobies do not overlap in this river. LD is more predominant in the upper reaches than CB. The stone size on the river bed in the region inhabited by LD was larger than that in the region inhabited by CB. LD was found to have larger body size, larger nest stones, egg clusters and egg numbers than CB. Laboratory nest choice experiments showed that LD selects larger nests than CB. This trend can be explained by a size-assortative nest preference across these species. The longitudinal distribution of stone size seems to affect upstream migration and reproduction of these species.
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