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Los técnicos del Parque Natural del Delta l’Ebre confían poder dar por erradicada la rana toro como especie invasora el próximo verano. En otoño hará un año que no se detecta ningún ejemplar adulto o renacuajo ni se les escucha croar pero dejarán pasar un nuevo ciclo reproductivo para asegurarse. El confinamiento del núcleo infestado, con una valla física que se construyó a contrarreloj, fue la clave para aislar los ejemplares que algún particular liberó en la zona del filtro verde y que se reprodujeron. También se salinizó el espacio. Esta especie tiene poca resistencia al agua salada. Leer más.

 

Anthropogenic climate change ranks among the major global-scale threats to modern biodiversity. Extinction risks are known to increase via the interactions between rapid climatic alterations and environmentally-sensitive species traits that fail to adapt to those changes. Accumulating evidence reveals the influence of ecophysiological, ecological and phenological factors as drivers underlying demographic collapses that lead to population extinctions. However, the extent to which life-history traits influence population responses to climate change remains largely unexplored. The emerging ‘cul-de-sac hypothesis’ predicts that reptilian viviparity (‘live-bearing’ reproduction), a ‘key innovation’ facilitating historical invasions of cold climates, increases extinction risks under progressively warming climates compared to oviparous reproduction – as warming advances polewards/mountainwards, historically cold-climates shrink, leading viviparous species to face demographic collapses. Leer más.

Based on molecular, morphological and field data, the status and zoogeography of the taxa of the Psammophis sibilans group north of 12°S are reviewed. Molecular data including sequences from 20 of the 22 described species known to occur north of 12°S suggest that P. sibilans distribution is restricted to northeastern Africa, from Egypt to Ethiopia. Populations from West Africa are described as a new species, Psammophis afroccidentalis sp. nov., and those from Chad, Cameroon and Central African Republic are assigned to P. rukwae which is also distributed from Tanzania to Ethiopia. Leer más.

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