Influence of environmental patterns on gonadosomatic index and early life stages of Paracentrotus lividus in Corsica (Mediterranean Sea)

Spatio-temporal patterns of the gonadosomatic index (GSI) and life cycle stages sea urchin Paracentrotus lividus were studied at two Corsican near sites which differ in terms protection status. The results highlighted an annual GSI with spring spawning (between May June) presumed lesser autumn (October or November). Spatial revealed homogeneity larval densities between whereas differences observed for settlers, recruits, sub-adults adult stages. Temporal variability was detected all highly variable stage settlement. This study suggests presence sporadic and/or arrival allochthonous larvae to sites. recruitment intensity years; 2016, peak recorded five-fold higher than 2015. confirmed importance habitat diversity on density small individuals. site’s status also influenced structuring P. indirectly as highest site where fishing allowed. Finally, this work difficulty observing temporal evolution natural environment.