February 1st to 5th 2016
Olhão, Portugal
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Density and distribution patterns of the endangered species Pinna nobilis within the harbour bay of Favignana (Egadi Islands MPA)

Scientific Exhibition
Habitat Loss and Ocean Noise
Thursday, February 4, 2016 -
17:30 to 19:30

D'Agostaro, R. 1 Donati, S. 2 Chemello, R. 3

1Department of the Earth and Marine Science, University of Palermo
2MPA of Egadi Islands
3University of Palermo, Department of the earth and marine science

The fan shell P. nobilis (Linnaeus, 1758) is the largest marine bivalve in the Mediterranean Sea which acts as ecosystem engineer, offering an adequate substratum to several associated benthic species.P. nobilis is threatened by the reduction and loss of its natural habitat and by increased anthropogenic inputs into coastal waters. The knowledge on the population of this species are scarce, especially as concerns Sicily and its coasts.This study focused on the density of population, spatial distribution, level of burial and orientation of the population of P. nobilis in the harbour area of Favignana island (western coast of Sicily, Italy).The fan shell surveys were carried out by SCUBA diving using a 50m-transect line perpendicular to the coastline. For each P. nobilis censused, maximum (W) width, minimum width (w) and unburied length (UL) were measured; shell orientation (Or) was determined using an underwater compass and considering the magnitude of the angle formed by the vector and the magnetic north. The specimen status (dead or alive), the depth (by using the electronic depth meter of a diving computer) were recorded. In addition, the geographical coordinates were marked for each individual along the transect by means of a Global Positioning System (GPS). Total shell height (HT) was estimated using a formula considered suitable for the populations of this studied area.The density of P. nobilis was ±11 ind. 100m2, the total height (HT) and the maximum width (W) of the shells was 33cm and 13,6cm respectively.In the aim of the "MPA of Egadi Islands" to confirm the need of a new management to protect the biodiversity of the harbour area, more conservation measures are necessary in order to improve the preservation of this endangered species.
keywords: 
Fan shell, habitat loss, MPA, density, mapping

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