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Human impact on Paracentrotus lividus: the result of harvest restrictions and accessibility of locations

Ceccherelli, Giulia and Pais, Antonio and Pinna, Stefania and Sechi, Nicola and Chessa, Lorenzo Antonio (2011) Human impact on Paracentrotus lividus: the result of harvest restrictions and accessibility of locations. Marine Biology, Vol. 158 (4), p. 845-852. ISSN 0025-3162. eISSN 1432-1793. Article.

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DOI: 10.1007/s00227-010-1611-5

Abstract

The sea urchin Paracentrotus lividus is common in the Mediterranean Sea in shallow subtidal rocky habitats, and it is intensely harvested for commercial and recreational purposes. This study is aimed at investigating whether the eVects of harvest restrictions of P. lividus in rocky reef habitats interact with the accessibility of locations in structuring sea urchin population (total and commercial-sized individuals). These results are important for generating hypotheses about the inXuence of human harvesting on P. lividus and for addressing suitable measures of conservation. Paracentrotus lividus was sampled after the end of the sea urchin harvesting period (May–July 2007) within the Gulf of Alghero (North West Sardinia), where the Capo Caccia–Isola Piana Marine Protected Area (MPA) was established since 2002. Paracentrotus lividus was sampled at sixteen locations and attributed in groups of four to 4 combinations of harvest restrictions (Restricted Harvest, RH, vs. Unlimited Harvest, UH) and accessibility (Boat vs. Car), which correspond to a gradient of potential human activity on P. lividus in the ranked order of very low (RHBoatfar), low (RHBoatclose), moderate (RHCar) and high (UHCar). At each location, two depth ranges of 3–7 and 8–12 m were considered. At each of these depths, two areas of about 100-m2 size were chosen. The density of P. lividus was assessed in ten quadrats of 1 x 1 m, and the size of 100 individuals (test diameter) was considered. Human activity has been found to signiWcantly aVect population structure of P. lividus influencing the proportion of individuals larger than 50 mm. Although harvest was restricted by MPA regulations, a significantly lower abundance of large individuals was found at sites accessible by car. This result highlights that there is an effect of harvest restrictions in relation to accessibility and emphasizes the need to carefully address the enforcement of the MPA toward easily accessible sites. Thus, surveillance and investment in enforcement of marine reserves seem crucial points that may provide the greatest return on maintaining the ecological benefits to the fishery activities.

Item Type:Article
ID Code:6142
Status:Published
Refereed:Yes
Uncontrolled Keywords:Paracentrotus lividus, Capo Caccia–Isola Piana, Marine Protected Area (MPA), Gulf of Alghero, (Northwestern Sardinia), Italy
Subjects:Area 07 - Scienze agrarie e veterinarie > AGR/20 Zoocolture
Area 05 - Scienze biologiche > BIO/07 Ecologia
Divisions:001 Università di Sassari > 01 Dipartimenti > Scienze zootecniche
001 Università di Sassari > 01 Dipartimenti > Scienze botaniche, ecologiche e geologiche
001 Università di Sassari > 01 Dipartimenti > Protezione delle piante
Publisher:Springer Berlin / Heidelberg
ISSN:0025-3162
eISSN:1432-1793
Copyright Holders:© Springer-Verlag 2011
Deposited On:10 Jun 2011 14:07

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