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Ecological Segregation Between Rana Pyrenaica and Rana Temporaria, and Differential Predation of Euproctus Asper On Their Tadpoles

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image of Netherlands Journal of Zoology
For more content, see Archives Néerlandaises de Zoologie (Vol 1-17) and Animal Biology (Vol 53 and onwards).

The objectives of this study are to analyse the degree of coexistence between Rana pyrenaica, Euproctus asper and Rana temporaria, to prove the existence of differential predation of E. asper on R. pyrenaica and R. temporaria tadpoles, and to analyse some of the consequences that this may have on the community of tadpoles of both species. Segregation/coexistence was investigated in 83 localities in the Spanish central and western Pyrenees and forty seven new localities for R. pyrenaica were identified. There is a significantly higher degree of coexistence between R. pyrenaica and E. asper than expected from a null association, but there is a spatial segregation between R. pyrenaica and R. temporaria. Laboratory tests showed the existence of selective predation of E. asper on R. temporaria tadpoles. The coexistence between R. pyrenaica and E. asper could favour the populations of R. pyrenaica by decreasing interspecific larvae competition and the chance that R. temporaria colonizes the egg-laying localities of R. pyrenaica.

Affiliations: 1: Instituto Pirenaico de Ecologia (C.S.I.C.), Avda. Montanana, 177. Aptdo. 202. 50080 Zaragoza, Spain


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