Seasonal and spatial variation in a prairie stream-fish assemblage

K. G. Ostrand, G. R. Wilde

Research output: Contribution to journalArticlepeer-review

78 Scopus citations


Stream-fish assemblage and environmental data for 13 sites in the upper Brazos River, Texas, USA during 1997 and 1998 were used to assess the relationship between environmental conditions, and seasonal and spatial variation in fish species abundance and distribution patterns. There was considerable spatial variation in environmental conditions among sites. Spatial variation in species diversity and species composition was related to variation in conductance (salinity), depth and current velocity among sites and streams. Species diversity increased downstream and species composition shifted from primarily cyprinodontids upstream to cyprinids downstream. Among all dominant species, spatial components of variation in fish abundance were greater than seasonal components, suggesting that assemblage structure is determined more by average or persistent differences in environmental conditions among sites than by seasonal variation in environmental conditions.

Original languageEnglish
Pages (from-to)137-149
Number of pages13
JournalEcology of Freshwater Fish
Issue number3
StatePublished - Sep 2002


  • Brazos River
  • Fish assemblage
  • Intermittent streams
  • Species diversity


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