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Título

Adaptation to osmotic stress provides protection against ammonium nitrate in Pelophylax perezi embryos

AutorOrtiz-Santaliestra, Manuel E. ; Fernández-Benéitez, María José; Lizana, Miguel; Marco, Adolfo
Palabras claveAmphibian decline
Intraspecific variation
Local adaptation
Multiple stressors
Salinity
Fecha de publicación2010
EditorElsevier
CitaciónEnvironmental Pollution 158(3): 934–940 (2010)
ResumenThe negative effects of pollution on amphibians are especially high when animals are additionally stressed by other environmental factors such as water salinity. However, the stress provoked by salinity may vary among populations because of adaptation processes. We tested the combined effect of a common fertilizer, ammonium nitrate (0–90.3 mg N–NO3NH4/L), and water salinity (0–2‰) on embryos of two Pelophylax perezi populations from ponds with different salinity concentrations. Embryos exposed to the fertilizer were up to 17% smaller than controls. Survival rates of embryos exposed to a single stressor were always below 10%. The exposure to both stressors concurrently increased mortality rate (>95%) of embryos from freshwater. Since the fertilizer was lethal only when individuals were stressed by the salinity, it did not cause lethal effects on embryos naturally adapted to saline environments. Our results underscore the importance of testing multiple stressors when analyzing amphibian sensitivity to environmental pollution.
Versión del editorhttp://dx.doi.org/10.1016/j.envpol.2009.09.011
URIhttp://hdl.handle.net/10261/47333
DOI10.1016/j.envpol.2009.09.011
ISSN0269-7491
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