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Seasonal and Long-Term Changes in the Fish Assemblage of a Small Stream Isolated by a Reservoir

Philip W. Lienesch, William I. Lutterschmidt and Jacob F. Schaefer
The Southwestern Naturalist
Vol. 45, No. 3 (Sep., 2000), pp. 274-288
DOI: 10.2307/3672830
Stable URL: http://www.jstor.org/stable/3672830
Page Count: 15
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Seasonal and Long-Term Changes in the Fish Assemblage of a Small Stream Isolated by a Reservoir
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Abstract

Because reservoirs are known to affect upstream fish communities, we assessed change in fish assemblages of a reservoir tributary from surveys conducted 10 and 50 years post-impoundment. We collected fishes from five sections of Buncombe Creek (a tributary to Lake Texoma, Oklahoma-Texas) in each season of 1995, and compared assemblages in each section among seasons. We also compared assemblages in each section pooled over all seasons to the assemblage present in 1954-1955. We used measures of persistence (species composition, Jaccard's Index), stability (relative abundance, Percent Similarity Index), and Detrended Correspondence Analysis to compare assemblages within 1995 and between the two surveys. There was little change in assemblages throughout 1995, with high stability in the most upstream section. The most change occurred between spring and summer. We collected 31 of the 47 species caught in 1954-1955, plus five additional species. The assemblage in the most upstream section of the creek showed the least persistence and the least stability between the two surveys. Longitudinal differences in fish assemblages of the creek were more pronounced in 1954-1955 than 1995. We discuss the possible role of isolation of Buncombe Creek from the free-flowing portion of the Red River in the extirpation of Notropis buchanani, Labidesthes sicculus, and Fundulus zebrinus. /// Porque se sabe que los embalses afectan comunidades de peces río arriba, evaluamos el cambio en congregaciones de peces en un tributario de embalse de inspecciones conducidas 10 y 50 años después de cierre. Recolectamos peces de cinco secciones de Buncombe Creek (un tributario de Lake Texoma, Oklahoma-Texas) en cada estación de 1995, y comparamos las congregaciones en cada sección entre estaciones. También comparamos congregaciones en cada sección reunidas de todas las estaciones con congregaciones presentes en 1954-1955. Usamos medidas de persistencia (composición de especies, Indice de Jaccad), estabilidad (abundancia relativa, Indice de Porcentaje de Similitad), y Detrended Correpondence Analysis para comparar congregaciones en 1995 y entre las dos inspecciones. Hubo poco cambio en congregaciones a través de 1995, con una estabilidad alta en la sección más río arriba. La mayoría de los cambios ocurrieron entre la primavera y el verano. Colectamos 31 de las 47 especies atrapadas entre 1954-1955, más cinco especies adicionales. La congregación en la parte más río arriba del riachuelo mostró la menor resistencia y estabilidad entre las dos inspecciones. Diferencias longitudinales en congregaciones de peces en el riachuelo fueron más pronunciadas en 1954-1955 que en 1995. Discutimos el posible papel del aislamiento de Buncombe Creek de la porción de corriente libre del Red River en la extirpación de Notropis buchanani, Labidesthes sicculus, y Fundulus zebrinus.

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