文章基本信息

标题：Habitat associations of the sharpnose shiner Notropis oxyrhynchus in the upper Brazos River, Texas
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作者：Gene R. Wilde ; Bart W. Durham
期刊名称：Journal of Freshwater Ecology
印刷版ISSN：0270-5060
电子版ISSN：2156-6941
出版年度：2013
卷号：28
期号：4
页码：453-461
DOI：10.1080/02705060.2013.817358
出版社：Taylor & Francis
摘要：Habitat associations of sharpnose shiner ( Notropis oxyrhynchus ) in the upper Brazos River, USA, were studied over a two-year period. We used generalized linear models with a logit link to assess the influence of individual physical and chemical habitat variables on the presence of sharpnose shiner at the microhabitat scale. Our models indicated that depth was the only habitat variable that significantly predicted sharpnose shiner presence during the first year of the study and that current velocity was the only variable that significantly predicted sharpnose shiner presence during the second year. Monthly plots of fitted regression estimates superimposed over frequency distributions for both significant variables revealed a distinct pattern of habitat use related to habitat availability. When only a narrow range of depths and current velocities was available, sharpnose shiner occurred more frequently in deeper and swifter microhabitats. In contrast, during periods with the greatest depths and current velocities, sharpnose shiner presence decreased with increasing depth and current velocity. Our results suggest that sharpnose shiner in the Brazos River exhibits habitat preferences but these preferences are conditional, based on the range of habitats available on a given date.
关键词：pelagic spawning; conservation; Notropis oxyrhynchus ; Brazos River; microhabitat; imperiled species