From the Great Lakes region to New England and up into Canada hybrid Ambystoma  salamanders occur.  Four species are involved in this hybridization complex: Jefferson salamander (Ambystoma jeffersonianum), blue-spotted salamander (Ambystoma laterale), smallmouth salamander (Ambystoma texanum), and eastern tiger salamander (Ambystoma tigrinum).  These species have hybridized into several interesting forms that are entirely female and usually polyploid, meaning they have more chromosome sets than the standard diploid (2 sets).  Hybrids can exist with genetic material from three of the four species.  Individuals can be triploid (3 sets of chromosomes), tetraploid (4 sets), and even pentaploid (5 sets). Leer más.

The first full study of a snake’s genome has revealed the Burmese python to be one of the most evolutionarily advanced creatures on Earth, international researchers said Monday. Leer más.

A new study has provided the first comprehensive insight into how snake venom evolved into the sophisticated cocktail of different proteins it is today. Leer más.

Acaba de salir este volumen. Ir al enlace.

En conjunto con las autoridades locales, Iberostar participa en un programa de conservación y protección de la tortuga marina en el Caribe mexicano, donde entre mayo y octubre esa especie nada hasta la orilla del mar para desovar en la arena. Leer más.