屏東縣萬安溪台灣石魚賓(Acrossocheilus paradoxus)之棲地利用
摘要
Snorkeling was utilized to investigate habitat use of Acrossocheilus paradoxus in Uanan creek, Pingtung since July to December, 2005. Fishes were divided into three size classes (i.e. juvenile, subadult, and adult) according to total length. Habitat use variables included overhead cover, depth, temperature, DO, and substrate. Averages of variables selected by juvenile were: overhead cover 16%, depth 85.2cm, temperature 23.5℃ and DO 9.2mg/L. Subadult selected overhead cover 17%, depth 105.8cm, temperature 23.6℃ and DO 9.5mg/L, while adult selected 18%, 106.9cm, 23.9℃ and 8.9mg/L respectively. Bedrock and boulder were preferred by all size classes of fishes. Significant difference appeared in depth selection between flood and drought seasons on juvenile, but neither on subadult and adult. Our conclusions were that habitat use of Acrossocheilus paradoxus was different at its two life history stages, and selection of bedrock and/or boulder were related to hiding and sheltering, but not feeding.