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.

在1995年至2004年的十年中，我们监控了非本地动物（Rhinogobius sp。OR）和两个本地溪流虾虎鱼（R. fluviatilis和R. nagoyae）的丰度，该区域位于卡莫河支流的固定范围内，日本西南部。非本地Rhinogobius sp。OR于1997年出现并繁殖，当时发生了细小沉积物增加的情况。但是，在经历了1999年的严重灾难之后，非本地虾虎鱼几乎完全从研究范围中消失了，而本地河豚的密度却有所提高。严重的事件可能阻止了非本地虾虎鱼的建立。我们的结果提供了非生物入侵屏障的实例。