Marine Protected Area of Tavolara Punta Coda Cavallo

Olbia, Italy

Marine Protected Area of Tavolara Punta Coda Cavallo

Olbia, Italy
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Panzalis P.,Marine Protected Area of Tavolara Punta Coda Cavallo | Navone A.,Marine Protected Area of Tavolara Punta Coda Cavallo | Careddu G.,Marine Protected Area of Asinara Island | Congiatu P.P.,Marine Protected Area of Asinara Island | And 2 more authors.
Marine Biology | Year: 2017

The survival of endangered and rare species with slow growth and low dispersal capabilities critically depends on the persistence of populations within marine protected areas (MPAs). The effectiveness of MPAs at maintaining the species evolutionary potential will depend on the occurrence of self-sustaining and viable populations, harboring sufficient levels of genetic diversity. Here, individuals of Patella ferruginea Gmelin, 1791, an endangered and rare limpet endemic to the western Mediterranean, were genotyped using eight microsatellite loci. Genetic information was used to assess the occurrence of (1) self-sustaining and viable populations and (2) fine-scale spatial genetic structure within two MPAs in the north of Sardinia Island. In contrast to the literature-based expectation of two relict and declining populations, levels of genetic diversity were similar to those reported for other marine gastropods. Furthermore, the contemporary effective population size was higher than the average effective size found in populations of other endangered species. Even accounting for uncertainty, such estimates exceeded the critical threshold below which inbreeding and random genetic drift determine the loss of genetic diversity. The two populations showed different spatial genetic patterns, which might reflect the interplay between species life-history traits and topographic and oceanographic features. With regard to the conservation and management of marine resources, these results stress once more the importance of taking into account both the species life-history traits and the habitat features that can limit connectivity at small geographic scales. © 2017, Springer-Verlag Berlin Heidelberg.

Calabretti C.,University of Milan Bicocca | Citterio S.,University of Milan Bicocca | Delaria M.A.,University of Sassari | Gentili R.,University of Milan Bicocca | And 4 more authors.
Biodiversity | Year: 2017

Nowadays harmful algal blooms (HABs) represent a serious problem for the conservation of the biodiversity in the Mediterranean Sea. Nevertheless the knowledge on the presence of potentially toxic benthic microalgae in particular habitats, such as tide pools, is still scarce. In order to detect HAB-producing benthic microalgae in tide pools of the rocky intertidal zone, a pilot study was conducted in Tavolara Punta Coda Cavallo Marine Protected Area (MPA) during the late spring of 2016. Three different pools were sampled in two study sites (six pools were sampled in total) and the cell density of toxic species was estimated in each. In all the collected samples, the two potentially toxic dinoflagellates, Prorocentrum lima (Ehrenberg) F. Stein and Coolia monotis Meunier, were recorded and significant differences in their density were observed, in relation to both sites and pools. © 2017 Biodiversity Conservancy International

Sturaro N.,University of Liège | Gobert S.,University of Liège | Perez-Perera A.,University of Liège | Caut S.,CSIC - Doñana Biological Station | And 3 more authors.
Marine Biology | Year: 2016

Amphipod assemblages that inhabit Posidonia oceanica seagrass meadows are potentially relevant trophic resources for ichthyofauna. However, the effects of fish predation on amphipod assemblages in this system have received little attention. To address this gap in knowledge, experimental manipulations of predation intensity (exclusion and inclusion cages) were conducted at two sites in a Mediterranean marine protected area, where different levels of fish predation were expected to occur. We found that in the absence of predatory fishes (exclusion cages), total amphipod density and biomass were higher than in uncaged areas and partially controlled cages. At the species level, Caprella acanthifera and Iphimedia minuta responded to caging with increased abundance, while in most cases different species did not exhibit differences in density or biomass between treatments. The presence of one enclosed labrid fish predator (inclusion cages) resulted in a lower density and biomass of Aora spinicornis and a lower biomass of Phtisica marina, although total amphipod density and biomass were unchanged. In the inclusion cages, a size-frequency analysis revealed that predators mainly targeted large A. spinicornis and Apherusa chiereghinii individuals. Our results suggest that predation by fish may be an important factor in controlling amphipod abundances and biomasses in P. oceanica meadows. Overall, amphipod community composition was not affected by exclusion or inclusion of fish predators. However, some significant effects at the species level point to more complex interactions between some amphipods and fish. © 2016, Springer-Verlag Berlin Heidelberg.

Guidetti P.,CNRS Ecology of Marine Ecosystems and Responses to Stress Laboratory | Baiata P.,CNRS Ecology of Marine Ecosystems and Responses to Stress Laboratory | Ballesteros E.,CSIC - Center for Advanced Studies of Blanes | Di Franco A.,CNRS Ecology of Marine Ecosystems and Responses to Stress Laboratory | And 9 more authors.
PLoS ONE | Year: 2014

Marine protected areas (MPAs) were acknowledged globally as effective tools to mitigate the threats to oceans caused by fishing. Several studies assessed the effectiveness of individual MPAs in protecting fish assemblages, but regional assessments of multiple MPAs are scarce. Moreover, empirical evidence on the role of MPAs in contrasting the propagation of non-indigenous-species (NIS) and thermophilic species (ThS) is missing. We simultaneously investigated here the role of MPAs in reversing the effects of overfishing and in limiting the spread of NIS and ThS. The Mediterranean Sea was selected as study area as it is a region where 1) MPAs are numerous, 2) fishing has affected species and ecosystems, and 3) the arrival of NIS and the northward expansion of ThS took place. Fish surveys were done in well-enforced no-take MPAs (HP), partiallyprotected MPAs (IP) and fished areas (F) at 30 locations across the Mediterranean. Significantly higher fish biomass was found in HP compared to IP MPAs and F. Along a recovery trajectory from F to HP MPAs, IP were similar to F, showing that just well enforced MPAs triggers an effective recovery. Within HP MPAs, trophic structure of fish assemblages resembled a top-heavy biomass pyramid. Although the functional structure of fish assemblages was consistent among HP MPAs, species driving the recovery in HP MPAs differed among locations: this suggests that the recovery trajectories in HP MPAs are likely to be functionally similar (i.e., represented by predictable changes in trophic groups, especially fish predators), but the specific composition of the resulting assemblages may depend on local conditions. Our study did not show any effect of MPAs on NIS and ThS. These results may help provide more robust expectations, at proper regional scale, about the effects of new MPAs that may be established in the Mediterranean Sea and other ecoregions worldwide. © 2014 Guidetti et al.

Sturaro N.,University of Liège | Lepoint G.,University of Liège | Perez-Perera A.,University of Liège | Vermeulen S.,University of Liège | And 3 more authors.
Marine Ecology Progress Series | Year: 2014

Marine protected areas (MPAs) are a key tool for conservation purposes, but few studies have assessed the responses of small macrozoobenthic assemblages to different protection levels in the Mediterranean Sea. In this study, we used a hierarchical sampling design spanning 3 orders of magnitude (1, 10 and 100 m) to investigate whether a MPA exerts an effect on amphipod assemblages associated with Posidonia oceanica meadows. We report spatial and temporal variability patterns of amphipod assemblages in 4 different protection levels and discuss potential confounding effects, such as habitat features. The structure of amphipod assemblages based on density data was patchy at all spatial scales investigated, but differed markedly among protection levels. Among outstanding points, multiscale analyses showed that lower densities and/or biomasses of several taxa occurred within fully protected and external areas, in comparison with partially protected areas (PPAs). Furthermore, P. oceanica meadow features (shoot density, leaf and epiphyte biomasses, coefficient A and litter biomass) accounted for only a low proportion of the total variability. We consequently infer that the observed patchiness is likely to occur for multiple and interconnected reasons, ranging from the ecological and behavioural traits of amphipod species to protection-dependent processes (e.g. fish predation). Long-term multiscale spatial and temporal monitoring, as well as experimental manipulations, are needed to fully understand the effects of protection on macrozoobenthic assemblages. © Inter-Research 2014.

Sahyoun R.,University of Salento | Sahyoun R.,CNRS Insular Research Center and Environment Observatory | Sahyoun R.,Laboratoire dExcellence Corail | Bussotti S.,University of Salento | And 7 more authors.
Journal of the Marine Biological Association of the United Kingdom | Year: 2013

Rocky banks (i.e. sea mountain-like structures rising from the sea bottom) are hard substrate habitats of high socio-economic value (e.g. for fishermen and divers) and ecological relevance as they often host unusually high density of fish. Here we tested whether the response of fish assemblages to protection (i.e. related to the presence of a Marine Protected Area (MPA)) in rocky banks is comparable with the response of rocky reefs dropping from the coast (hereafter called 'coastal rocky substrates'), and whether there are differences between fish assemblages associated with protected and unprotected rocky banks. Fish assemblages were assessed in shallow and deep coastal rocky substrates, and in rocky banks, in unprotected and protected conditions at a Mediterranean MPA in north-east Sardinia in August 2007 and 2008. Whole fish assemblage structures (in terms of biomass) differed between protected and unprotected conditions in both study years. Fish assemblages at rocky banks, in addition, differed from those associated with coastal rocky substrates. Total fish biomass (summing contribution of all species) was higher under protected than unprotected condition in 2007, while species richness and total fish density did not demonstrate any significant change related to protection. The responses to protection displayed by the target species Epinephelus marginatus and Diplodus sargus were clear especially in terms of greater frequency of large-sized specimens in both study years. Biomass of E. marginatus in 2007 and density of D. sargus in 2007 and 2008 were significantly higher in protected than unprotected conditions, especially in protected rocky banks. This study emphasizes the ecological and socio-economic role of protection and the potential role of rocky banks within management/conservation programmes in the Mediterranean Sea. Copyright © 2012 Marine Biological Association of the United Kingdom.

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