[automatically translated] In the AMP "Ustica" the establishment of the protection regime, and then the pickup ban, it caused an increase in the density of the hedgehog edible Paracentrotus lividus (Lam.) With adverse effects on algal communities. The intense grazing of these regular echinids has indeed transformed the superficial fascia submerged in a barren ground, low area complexity and diversity. A good estimate of the operational sex ratio (OSR) of P. lividus can clarify important aspects of the population dynamics of this species and be of considerable help in a logic of managerial intervention. The aim of this study was to evaluate the OSR of the P. lividus population present in the AMP "Ustica Island." The values of OSR were recorded in two sites in the zone C, C1 and C2, and at a local site A. The values of OSR registered in the A and C1 area, are values close to 0.5 and then show us that there is a balance between the sexes and "well-being" of the species. The OSR recorded in the C2 zone (equal to 0.6) however reveals an imbalance between the sexes in favor of the male. This result prospetterebbe the possibility of a further increase in number of the population.
|Number of pages||3|
|Publication status||Published - 2006|