Effects of salinity on specific gravity and viability of eggs of a North American minnow (Cyprinidae)

David E. Cowley; Janelle C. Alleman; Rossana Sallenave; Ryan R. McShane; Patrick D. Shirey

doi:10.3989/scimar.2009.73s1047

Autores/as

David E. Cowley Department of Fish, Wildlife, and Conservation Ecology, New Mexico State University
Janelle C. Alleman Department of Fish, Wildlife, and Conservation Ecology, New Mexico State University
Rossana Sallenave Department of Biology, Colorado State University - Department of Extension Animal Sciences and Natural Resources, New Mexico State University
Ryan R. McShane Department of Fish, Wildlife, and Conservation Ecology, New Mexico State University - Department of Biology, Colorado State University
Patrick D. Shirey Department of Fish, Wildlife, and Conservation Ecology, New Mexico State University - Department of Biological Sciences, University of Notre Dame

DOI:

https://doi.org/10.3989/scimar.2009.73s1047

Palabras clave:

deriva de huevos de peces, flotabilidad, ósmosis, supervivencia, Hybognathus amarus

Resumen

El efecto de la salinidad sobre la supervivencia, gravedad específica y talla de los huevos del ciprínido puesto en peligro de extinción, Hybognathus amarus, fue estudiado para proporcionar información sobre los factores que afectan la dispersión y el destino de los huevos. Bajo condiciones de salinidad baja la gravedad específica del huevo disminuyó de forma significativa durante la primera hora después de la puesta, a medida que el espacio del perivitelino del huevo se fue llenando de agua. la gravedad específica del huevo alcanzó un valor mínimo 1 hora después de la puesta y quedó aproximadamente constante hasta eclosión, que ocurrió alrededor de 48 horas tras la puesta a 20˚C. la gravedad específica del huevo dependió de la salinidad del agua que le rodeaba. los huevos con corion endurecido cambiaron rápidamente en diámetro y gravedad específica cuando fueron expuestos a agua de salinidad más alta. El tamaño y la gravedad específica de los huevos de H. amarus también se diferenciaron cuando los huevos fueron incubados en diferentes fuentes de agua subterránea. Los experimentos indicaron que la solución salina del cloruro de calcio tuvo un mayor efecto sobre la gravedad específica del huevo que las soluciones de los cloruros del sodio o del potasio. Expuestos a soluciones de salinidad de más de 3 (PsU), la supervivencia de los huevos de H. amarus disminuyó claramente, bajando a sólo el 5% en la solución de 8. la restauración del hábitat con el objetivo de beneficiar a H. amarus debe considerar la salinidad de los hábitats en los cuales el huevo incuba.

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