Temporal trends in biodiversity of the middle-slope assemblages in Sardinian seas (Central-Western Mediterranean)

Sabatini, Andrea; Locci, Ivan E.; Deiana, Anna Maria; Follesa, María Cristina; Gastoni, A; Pendugiu, Antonio A.; Pesci, Paola; Cau, Angelo

doi:10.1017/s0025315413000258

Cited by 7 publications

(5 citation statements)

References 45 publications

(52 reference statements)

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“…Assessment at a community level is therefore crucial, particularly due to the multispecies nature of the bottom trawl fishery and also because a decline in the diversity of demersal assemblages has been reported due to fishing exploitation (e.g. Ungaro et al 1998, Sabatini et al 2013, Farriols et al 2017. Assessment at a community level is also a requirement for the implementation of an ecosystem-based management of fisheries (Browman and Stergiou 2004).…”

Section: Introductionmentioning

confidence: 99%

Spatio-temporal trends in diversity of demersal fish assemblages in the Mediterranean

Farriols

Ordines

Carbonara³

et al. 2020

Sci. Mar.

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The high species richness, coupled with high proportion of endemism, makes the Mediterranean one of the world’s ‘biodiversity hotspots’. However, the continuous increase in fisheries in the last few decades has led to the overexploitation of their main commercial stocks. Using fishery-independent data collected under the framework of the MEDITS trawl surveys carried out over the last 20 years, we study the demersal fish diversity pattern in the Mediterranean at a large spatial and temporal scale to determine whether it is being affected by the general fishing overexploitation of the demersal resources. The detected diversity trends are compared with the spatio-temporal variation in bottom trawl fishing effort in the Mediterranean. Our results show a stability and even recovery of demersal fish diversity in the Mediterranean together with higher diversity values on the continental shelves of the Balearic Islands, Sardinia, Sicily and the Aegean Sea. At large temporal and spatial scales, the high diversity of demersal assemblages in the Mediterranean is associated with a reduction in bottom trawl fishing effort. The inclusion of species other than target ones through diversity indices is important in the implementation of an ecosystem-based fisheries management.

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Section: Introductionmentioning

confidence: 99%

Spatio-temporal trends in diversity of demersal fish assemblages in the Mediterranean

Farriols

Ordines

Carbonara³

et al. 2020

Sci. Mar.

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“…In the same study, the Authors also highlighted the presence of a set of data showing a patchy distribution of spawners through space and time, with no clear correlation either with time or geographical area, probably linked to local environmental conditions (hydrological, topographical or ecological, as mentioned previously in the text) that may influence the time and location of the spawning areas. The analysis of previous literature shows that the variability in geographical distribution and abundances is associated with a high sensitivity of this species to both overfishing (Relini and Orsi Relini, ; D'Onghia et al ., ; Sabatini et al ., ) and abiotic stressors such as the topography of the continental slope, presence of geomorphological structures (Sabatini et al ., , ) and oceanographic and climatological factors (Politou et al ., ; Capezzuto et al ., ; Cartes et al ., ,b).…”

Section: Introductionmentioning

confidence: 99%

“…From the hydrodynamical perspective, the seas around Sardinia are quite heterogeneous from the geomorphological (Ulzega, ), hydrodynamical (Ribotti et al ., ; Olita et al ., ,b, , ) and fishing grounds (Sabatini et al ., ) point of views. Figure a schematically shows the main circulation features of the study area.…”

Section: Introductionmentioning

confidence: 99%

Modelling giant red shrimp larval dispersal in the Sardinian seas: density and connectivity scenarios

Palmas

Olita

Addis

et al. 2017

Fisheries Oceanography

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The connectivity and three-dimensional (3D) dispersion of the larvae of giant red shrimp, potentially released from known spawning areas along the Sardinia slope in the western Mediterranean Sea, were assessed using Lagrangian simulations forced by a 3D submesoscale permitting a regional ocean model. Biophysical simulations using the hydrodynamic conditions of the year 2012 were run to track propagules released from known spawning areas during the spawning period (May to September). Passive transport (PT) and vertical migration (VM) scenarios were tested, each with two possible pelagic larval durations (PLDs) of 21 or 42 days. Dispersion of propagules in the PT and VM scenarios differed in terms of travelled distance, export out of the domain (larger for VM), and depth distribution (shallower and bimodal for VM due to the larger variability of encountered currents). Connectivity patterns were investigated among eight release areas, and four predetermined Eco-Regions, and results showed strong connectivity among the North-Western (NW), Western (W), and Southern (S) regions of Sardinia, whereas the Eastern region was more segregated. Differences in connectivity patterns among scenarios were related mainly to the tendency of greater retention of propagules in the release area for the PT scenarios. This finding, together with existing hypotheses of vertical migration likely occurring during first egg-larval phases, suggest that the VM scenarios are the most probable of the two hypotheses tested. Strong connectivity between the W and S sides of Sardinia and the relative isolation of the E side could have significant implications for the protection of this important resource

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“…The spatio-temporal variability of the species abundance would seem also related to large-scale climatic indices, such as the North Atlantic Oscillation (NAO) (D'Onghia et al, 2012) even if the variability can differ among even nearby ports (Hidalgo et al, 2015). All of the above delineated abiotic constraints are associated with an intense and prolonged fisheries exploitation, resulting in concurring effects which make difficult the interpretation of the whole picture of the species' distribution (Rinelli et al, 2013;Sabatini et al, 2013).…”

Section: Discussionmentioning

confidence: 99%

Exploring relationships between the distribution of giant red shrimp <em>Aristaeomorpha foliacea</em> (Risso, 1827) and environmental factors in the Central-Western Mediterranean Sea

et al. 2020

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Mediterranean giant red shrimp Aristaeomorpha foliacea (Risso, 1827) is one of the dominant species in deep-sea megafaunal assemblages, plays a key role in deep-sea communities and it is considered one of the most important targets of deep-water trawl fishing. Although a large number of studies have analysed the spatial distribution of epibenthic crustaceans in bathyal habitats with respect to environmental, geomorphological and hydrological factors, as well as fishing pressure, the manner in which these variables synergistically affect the spatio-temporal changes of giant red shrimp is unclear. To analyse the possible effects of abiotic predictors on the spatio-temporal distribution of giant red shrimp, Generalized Additived Models (GAMs) and Regression Trees were produced. Biological data were collected during the MEDITS trawl surveys carried out in the Sea of Sardinia (2009-2014), during which environmental data were obtained with a multiparametric probe. A longitudinal (west-east) trend was found, with higher abundances at depths of 400-600 m, corresponding to salinity values of 38.1-38.5 psu and temperatures of 13.6-13.8°C. Our results confirm the existence of a tight linkage between the distribution of the Levantine Intermediate Water (LIW) from the eastern Mediterranean Sea and the preferential habitat characteristics of the giant red shrimp. We suggest that a deeper knowledge of the relationships between abiotic (hydrological) factors in the water column and the distribution of Mediterranean resources, such as the giant red shrimp, can provide valuable support for their better management, at the local scale (Sardinia) and across the whole Mediterranean Sea.

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Temporal trends in biodiversity of the middle-slope assemblages in Sardinian seas (Central-Western Mediterranean)

Cited by 7 publications

References 45 publications

Spatio-temporal trends in diversity of demersal fish assemblages in the Mediterranean

Spatio-temporal trends in diversity of demersal fish assemblages in the Mediterranean

Modelling giant red shrimp larval dispersal in the Sardinian seas: density and connectivity scenarios

Exploring relationships between the distribution of giant red shrimp <em>Aristaeomorpha foliacea</em> (Risso, 1827) and environmental factors in the Central-Western Mediterranean Sea

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