7 research outputs found
Trawl fishery restricted areas in the Mediterranean Sea.
<p>Trawl fishery restricted areas are shown in blue, trawlable areas are shown in white.</p
List of the species and Mediterranean geographical sub-areas (GSAs) where recruit density was modelled for nursery identification.
<p>The modelling approaches used are indicated: GLMM (generalized linear mixed models); GAMM (generalized additive mixed models); INLA (Bayesian GLMM); Z (zero inflated generalized additive models, ZIGAM); OK (ordinary kriging); IDW (interpolate distance weighting)</p><p>List of the species and Mediterranean geographical sub-areas (GSAs) where recruit density was modelled for nursery identification.</p
Map showing the spatial overlap among the persistent nursery areas of 11 species of demersal fish and shellfish in EU Mediterranean waters.
<p>Colours indicate different classes of spatial overlap index (<i>SO</i>). Spatial overlap was calculated considering three different classes of the temporal persistence index (<i>I</i><sub><i>i</i></sub>): A) <i>I</i><sub><i>i</i></sub>>0.05; B) <i>I</i><sub><i>i</i></sub>>0.2; C) <i>I</i><sub><i>i</i></sub>>0.4. Numbers indicate the numbers of species modelled in each GSA. Note that, since the number of species modelled varied among GSAs, the overlap index <i>SO</i> was calculated separately for each GSA to avoid any comparative analysis at a larger geographical scale that can lead to misleading conclusions.</p
Map showing the study area with the position of the MEDITS trawl stations (year 2008).
<p>Numbers refer to Mediterranean FAO-GFCM GSAs (Geographical Sub-Areas). 1 Northern Alboran Sea, 5 Balearic Islands, 6 Northern Spain, 7 Gulf of Lions, 8 Corsica Island, 9 Ligurian and North Tyrrhenian Sea, 10 South Tyrrhenian Sea, 11 Sardinia, 15 Malta Island, 16 South of Sicily, 17 Northern Adriatic, 18 Southern Adriatic Sea, 19 Western Ionian Sea, 20 Eastern Ionian Sea, 22 Aegean Sea, 23 Crete Island, 25 Cyprus Island.</p
Distribution maps of persistence index (Ii) of nursery areas of commercial fish in the North Mediterranean Sea.
<p>A) European hake (<i>Merluccius merluccius</i>), B) red mullet (<i>Mullus barbatus</i>), C) common Pandora (<i>Pagellus erythrinus)</i>, D) common sole (<i>Solea solea</i>), e) blackmouth catshark (<i>Galeus melastomus</i>) and E) thornback ray (<i>Raja clavata</i>). The index <i>Ii</i> ranges between 0 (portion <i>i</i> of the study area never included in an annual nursery) and 1 (portion <i>i</i> of the study area always included in an annual nursery).</p
Surface extent in km2 of total nursery areas identified and of nursery areas with a temporal persistence >40% (N40), for a set of 11 demersal species in Mediterranean European waters.
<p>The conservation effect of ongoing spatial restriction measures for trawling (TFRA) is measured in terms of total and percentage of protected N40.</p><p>Surface extent in km2 of total nursery areas identified and of nursery areas with a temporal persistence >40% (N40), for a set of 11 demersal species in Mediterranean European waters.</p
SEAwise Report on the key drivers of stock productivity and future environmental scenarios
An ecosystem approach to fisheries management requires the consideration of commercial species as components of an ecosystem and the acknowledgement of the links between their productivity and the surrounding environment. To provide a knowledge base for such links, SEAwise consulted stakeholders throughout Europe and conducted a systematic review of the scientific literature.
The systematic review resulted in 2050 articles from the literature search that were screened for their tile and abstract. 516 of them were retained for data extraction. The majority of studies were conducted in the Baltic Sea and the North Sea, followed by the Western Waters, and with only a few dozen papers in the Mediterranean Sea. Cod and herring were the most studied species, temperature and more generally climate and hydrodynamics indicators were the main drivers investigated, and reproduction was the main productivity-related process. The output of the systematic review is a database of scientific articles organised by regions, species, environmental drivers and productivity-associated processes and where outcomes, but also spatial and time scales, analytical methods etc. are described in a standardised fashion. This database will be analysed in the coming months and used in the downstream tasks of WP3.
The most frequently driver identified by stakeholders across regions was climate change followed by species interactions, cod, pollution, commercial fish/shellfish and plankton. Climate change effects on stocks through temperature and salinity are relatively well covered in the literature as are effects of plankton and species interaction. Studies of the effects of pollution do not occur frequently and as a consequence require a dedicated effort is made in SEAwise to remedy this. Species reported frequently by the stakeholders included cod, seabass, sardine, sole, crabs, flatfish, Norway lobster, octopus, shrimps, herring, sprat, anchovy, hake, new species (species increasing in abundance as a result of climate change as well as invasive species of commercial interest) and sandeel. Among these, more than 10 papers were retrieved for cod, sardine, sole, herring, sprat, selected flatfish, anchovy, hake and sandeel. For the remaining species, a dedicated effort must be made in SEAwise if they are to be included in stock models.Â
This report describes results of the SEAwise project. More information about the project can be found at https://seawiseproject.org/</p