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Santa Margherita Ligure, Italy

Venturini S.,Portofino Marine Protected Area | Massa F.,University of Genoa | Castellano M.,University of Genoa | Costa S.,University of Genoa | And 3 more authors.
Environmental Management | Year: 2016

Recreational boating is an important economic activity that can also represent a powerful source of interference for biological communities. The monitoring of the recreational boating in all Marine Protected Areas (MPAs) within the Liguria region was conducted in the 2010 summer season and it allowed to obtain information not provided by any official institution. The collaboration of geographically different MPAs in Liguria has led to the implementation of a monitoring framework of recreational boating, and this has made it possible to develop uniform management strategies for all the Ligurian marine parks. This study identifies the optimal number of boats for each MPAs, the number of boats that can anchor in the various parks without creating any impact on the biocenosis of merit, providing a first characterization of recreational boating in Liguria during the high touristic season and providing management recommendation to each MPAs. Generally, the Ligurian MPAs do not present critical situations, the number of boats in each MPA being below the optimal number, with the exception of Portofino MPA, where in the 12.5 % of monitored days more than 220 boats were counted and the mean density for weekend is 1.19 no boats/ha (4 times higher than weekday). The results confirm the dependence of the boats peaking from the holidays and the months of the summer, but also it highlights other factors that can contribute in the choice of the boaters. © 2015, Springer Science+Business Media New York.

Cattaneo-Vietti R.,Marche Polytechnic University | Cappanera V.,Portofino Marine Protected Area | Castellano M.,University of Genoa | Povero P.,University of Genoa
Marine Ecology | Year: 2015

Since the 17th century, the Tonnarella of Camogli, a small tuna trap, has been used to catch pelagic fish along the western coast of the Portofino Promontory (Ligurian Sea, Northwestern Mediterranean). The availability of long-term datasets on fish yields (1950-1974 and 1996-2011), with information related to the seawater temperatures and the North Atlantic Oscillation (NAO), has allowed us to study the qualitative and quantitative changes in fish yields in the last decade and the possible relationships with the seasonal anomalies of temperature that have occurred in the Ligurian Sea. In 1950-1974, yields remained relatively constant over time (average of 35.6 ± 8.7 t·year-1). From 1996 through 2011, yields were high (42.9 ± 15.9 t·year-1) but inconsistent with strong annual variability in catches. The primary catches are Seriola dumerili, Auxis rochei, Trachurus spp. and Sarda sarda. Changes in species composition have occurred as well: S. dumerili, Sardinella sp. and Belone belone have appeared recently. Moreover, a significant decrease in the boreal scombroid (Scomber scombrus) and an increase of warm-temperate carangids and other typically Southern Mediterranean species such as Coryphaena hippurus and Sphyraena viridensis, appear to be linked to the warming of the surface water layer, particularly evident in the Ligurian Sea, for the last 10 years. The analysis of this kind of trend may be a powerful tool for assessing structural changes of the pelagic fish community in the Ligurian Sea (Northwestern Mediterranean). © 2014 The Authors Marine Ecology Published by Blackwell Verlag GmbH.

Syvaranta J.,University of Jyvaskyla | Syvaranta J.,CNRS Functional Ecology & Environment Laboratory | Harrod C.,Queens University of Belfast | Harrod C.,University of Antofagasta | And 4 more authors.
Journal of Fish Biology | Year: 2012

Evidence is provided from stable isotope analysis that aggregations of small ocean sunfish Mola mola (total length < 1 m) feed broadly within coastal food webs and their classification as obligate predators of gelatinous zooplankton requires revision. © 2011 The Fisheries Society of the British Isles.

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