Homing behaviour of Parablennius parvicornis (Pisces: Blenniidae)

The homing ability of the rockpool fish Parablennius parvicornis was studied at the rocky shore of Gran Canaria (Canary Islands, Spain). Fish were displaced from the original rockpool during low tide to another pool 74 metres away. The return of the first blenny occurs directly after the first tide while one week later 40% of the blennies had returned to the original pool. This paper discusses the homing behaviour of this species. RESUMEN: Se estudian las habilidades de retorno (homing) de la barriguda Parablennius parvicornis en una región de la costa rocosa de la isla de Gran Canaria (Islas Canarias, España). Los peces fueron desplazados desde su charco original, durante la bajamar, a otro charco que distase 74 metros. El retorno de la primera barriguda ocurrió después de la primera marea, mientras que tras una semana habían regresado el 40% de los peces originalmente desplazados. En este artículo se discute el comportamiento de retorno de esta especie

Lost at sea: Genetic, oceanographic and meteorological evidence for storm-forced dispersal

[EN] For many species, there is broad-scale dispersal of juvenile stages and/or long-distance migration of individuals and hence the processes that drive these various wide-ranging move- ments have important life-history consequences. Sea turtles are one of these paradigmatic long-distance travellers, with hatchlings thought to be dispersed by ocean currents and adults often shuttling between distant breeding and foraging grounds. Here, we use multi- disciplinary oceanographic, atmospheric and genetic mixed stock analyses to show that juvenile turtles are encountered ‘downstream’ at sites predicted by currents. However, in some cases, unusual occurrences of juveniles are more readily explained by storm events and we show that juvenile turtles may be displaced thousands of kilometres from their expected dispersal based on prevailing ocean currents.

Lost at sea: Genetic, oceanographic and meteorological evidence for storm-forced dispersal

[EN] For many species, there is broad-scale dispersal of juvenile stages and/or long-distance migration of individuals and hence the processes that drive these various wide-ranging move- ments have important life-history consequences. Sea turtles are one of these paradigmatic long-distance travellers, with hatchlings thought to be dispersed by ocean currents and adults often shuttling between distant breeding and foraging grounds. Here, we use multi- disciplinary oceanographic, atmospheric and genetic mixed stock analyses to show that juvenile turtles are encountered ‘downstream’ at sites predicted by currents. However, in some cases, unusual occurrences of juveniles are more readily explained by storm events and we show that juvenile turtles may be displaced thousands of kilometres from their expected dispersal based on prevailing ocean currents.