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Título

Inter- and intra-specific variation on sensitivity of larval amphibians to nitrite

AutorShinn, C.; Marco, Adolfo ; Serrano, L.
Palabras claveNitrite
Amphibian larvae sensitivity
Epidalea calamita
Pelophylax perezi
Hyla meridionalis
Inter- and intra-specific variation
Fecha de publicaciónmar-2008
EditorElsevier
CitaciónChemosphere 71 (2008) 507–514
ResumenSeveral authors have suggested that nitrogen-based fertilizers may be contributing to the global amphibian decline. We have studied the impact of sodium nitrite on early aquatic stages of Epidalea calamita, Pelophylax perezi and Hyla meridionalis larvae from Doñana National Park (coastal wetland) and P. perezi from Gredos Mountain (high mountain ponds), exposed during 10 to 16 days. After 8 days of exposure all P. perezi larvae from Doñana presented 100% mortality at 5 mg l−1View the MathML source while E. calamita larvae mortality rates were significantly lower at that concentration after 15 days. However, for H. meridionalis at day 15 no deaths were registered at 5 mg l−1View the MathML source and at 20 mg l−1View the MathML source presented intermediate mortality rates. In Doñana the 10 d LC50 of older H. meridionalis larvae was between 20 and 30 mg l−1View the MathML source whilst for P. perezi it was below 5 mg l−1View the MathML source. These results indicate inter-specific variation of the sensitivity of larval amphibians to nitrite. Gredos Mountain P. perezi larvae exposed since the egg stage were highly sensitive to nitrite, with a 16 d LC50 below 0.5 mg l−1View the MathML source. The same species in Doñana had a 15 d LC50 between 5 and mg l−1View the MathML source. These results suggest that there is also intra-specific variation in sensitivity of amphibian larvae to nitrite: mountain amphibian populations appear to be more sensitive to polluted environments than coastal populations. Geographic and genetic variation and evolutionary adaptation of tolerance may also be the keys to variation amongst populations of the same species.
Versión del editorhttp://dx.doi.org/10.1016/j.chemosphere.2007.09.054
URIhttp://hdl.handle.net/10261/47397
DOI10.1016/j.chemosphere.2007.09.054
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