- Title
- Trachurus mediterraneus (Mediterranean horse mackerel) recruits
- Abstract
The map shows the area where recruits of Trachurus mediterraneus concentrate (nursery areas) in the Mediterranean Sea for the period 2003-2009 during early winter. Nursery areas have been assessed in the framework of MAREA-MEDISEH Project through habitat suitability modeling, relating abundance information from surveys with environmental variables.
- Publication Date
- Sept. 1, 2014, 3:09 p.m.
- Type
- Vector Data
- Category
- Environment and Ecosystems
- Data related to environment and ecosystems
- Owner
- MEDISEH
- Maintenance Frequency
- There Are No Plans To Update The Data
- Restrictions
- This shapefile was provided by MAREA Consortium (framework contract MARE/2009/05 - Lot 2 (MEDISEH)) to be used inside ADRIPLAN Project. The geographical information is provided "as it is", and no warranty of any kind (express, implicit) is offered as to the information's accuracy. The information provided does not imply any opinion of the developers concerning the legal status of any country, territory or area, or concerning the delimitation of its frontiers or boundaries. The data cannot be used for legal, commercial (e.g. exploration of natural resources, consultancy work) or for navigational purposes. It is clarified that the raw data collected or provided to the consortium for the purposes of MEDISEH, are not allowed to be redistributed or provided to third parties (under any format e.g. GIS Shape files) for any reason, without the permission of the original data provider. Fisheries data collected within the Data Collection Framework cannot be redistributed for any reason. To access project's meta-analysis data (i.e. model output), please send a request to MEDISEH scientific coordinator and to the MAREA scientific coordinator (request form: http://mareaproject.net/medviewer/registration/register/). Please note that the request will also be forwarded to DG-MARE, for final approval by the European Commission Services. It has also to be recalled the provisions of Article II.10.3 of the Framework Contract: "Any distribution or publication of information relating to the Contract by the Contractor shall require prior written authorization from the Commission and shall mention the amount paid by the Union. It shall state that the opinions expressed are those of the Contractor only and do not represent the Commission's official position". The project's final report can be found at http://mareaproject.net/contracts/5/reporting/ (Mediterranean Sensitive Habitats (MEDISEH) (2013). Final report. Edited by M. Giannoulaki, A. Belluscio, P. Panayotidis, S. Fraschetti, M. Scardi, F. Colloca, C. Smith, V. Valavanis, M.T. Spedicato. DG MARE Specific Contract SI2.600741, Final Report, 557 p. Heraklion (Greece): Hellenic Centre for Marine Research.)
- Purpose
Objectives:
- Review and map all existing information on historical and current data of nurseries and spawning grounds of certain small pelagic (i.e., Engraulis encrasicolus, Sardina pilchardus, Scomber spp., Trachurus spp) that are included in the Data Collection Framework for the Mediterranean and subjected to minimum landing size based on Council Regulation No 1967/2006-Annex II
- Analyze existing survey data and apply spatial analysis techniques in order to identify locations that are more likely to be density hot spot areas or are being more suitable for fish nurseries and spawning grounds for Engraulis encrasicolus, Sardina pilchardus, Scomber spp., Trachurus trachurus, Trachurus mediterraneus. These areas will also be characterized from an environmental and ecological perspective upon data availability.
- Integrate and present the aforementioned information through a web based GIS viewerwith an associated geo-referenced database that will operate as a consulting tool for spatial management and conservation planning.- Language
- English
- Supplemental Information
Model obtained applying habitat suitability modeling techniques and using environmental data in order to obtain an idea of potential spawning grounds throughout the Mediterranean Sea and analyze persistent spawning areas based on annual distribution maps.
For this purpose, Generalized Additive Models (GAMs, Hastie and Tibshirani, 1990) were applied to define the set of environmental factors that describe anchovy’s distribution in the study areas. The final model was built by testing all variables that were considered biologically meaningful, starting from a simple initial model with one explanatory variable. The selected model was tested and evaluated for its predictive performance for areas and periods not included in model selection.
Mapping. Based on validation results, the selected models were applied in a predictive model to provide probability estimates and habitat adequacy over a grid of mean monthly satellite values at a GIS resolution of 4 km, covering the entire Mediterranean basin. Subsequently, annual habitat suitability maps were constructed. Finally, persistent (or otherwise preferential) and occasional spawning grounds were defined based on average probability and variability maps (Bellier et al. 2007). Based on Bellier et al. (2007) a habitat allocation map was created indicating recurrent spawning sites as areas with high mean probability and low standard deviation values, occasional spawning sites: areas with high mean probability and high standard deviation values (i.e., where anchovy eggs are present indicating high probability in some years but not in others) and rare spawning sites.- Spatial Representation Type
- vector data is used to represent geographic data
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