Selección sexual en machos de Poecilia reticulata (gupis) ante hembras emparentadas

El éxito reproductivo de un individuo es lograr que sus descendientes posean características que les permitan adaptarse mejor al medio. En este sentido, es muy importante reducir en lo posible la endogamia, ya que se ha constatado que reduce la fecundidad de la especie y reduce la supervivencia de la progenie. Para conseguirlo, la selección de la pareja juega un papel fundamental, papel que la mayoría de los trabajos centran en las hembras. No obstante, en este trabajo se demuestra que los machos de gupi (Poecilia reticulata) también tiene capacidad para discriminar entre hembras estrechamente emparentadas o no, seleccionando como pareja aquellas menos familiares. ABSTRACT: The reproductive success of an individual is to achieve that its offprint inherit those features that allow them to a better adaptation to the environment. In this way, it is very important to reduce the endogamy because it reduces the fecundity and the survival rate of the offprint. The sexual selection plays and important role to achieve it, and the majority of works gives this selection capacity to females. However, in this paper it is demonstrated that males of guppy (Poecilia reticulata) are able to recognize siblings and prefer to court not related females.

Protocolo de anestesia y recuperación para estudio de morfometría de juveniles de caballito de mar, (Hippocampus hippocampus (Linnaeus, 1758)

Anaesthetic and Recovery Protocol for morfometric study of Atlantic seahorse, Hippocampus hippocampus (Linnaeus, 1758), juveniles. Some morphometric studies in marine organism need anaesthetics in order to avoid animal?s sacrifice and allow its recovery. In this study different natural clove essential concentrations has been tested in Atlantic seahorses, Hippocampus hippocampus (Linnaeus, 1758) aged 13 (trunk length 7,48 ± 1,14 mm) and 22 days (trunk length 9,09 ± 1,62 mm). An inversed relation was observed between anaesthetic concentration and effective time. The concentration allowing measures was 25 ppm. This procedure allowed 100% survival rate.