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Modelling of European hake nurseries in the Mediterranean Sea: an ecological niche approach ArchiMer
Druon, Jean-noel; Fiorentino, Fabio; Murenu, Matteo; Knittweis, Leyla; Colloca, Francesco; Osio, Chato; Merigot, Bastien; Garofalo, Germana; Mannini, Alessandro; Jadaud, Angelique; Sbrana, Mario; Scarcella, Giuseppe; Tserpesi, George; Peristeraki, Panagiota; Carlucci, Roberto; Heikkonen, Jukka.
An ecological niche modelling (ENM) approach was developed to model the suitable habitat 36 for the 0-group European hake, Merluccius merluccius L., 1758, in the Mediterranean Sea. 37 The ENM was built combining knowledge on biological traits of hake recruits (e.g. growth, 38 settlement, mobility and feeding strategy) with patterns of selected ecological variables 39 (chlorophyll-a fronts and concentration, bottom depth, sea bottom current and temperature) 40 to highlight favourable nursery habitats. The results show that hake nurseries require stable 41 bottom temperature (11.8-15.0oC), low bottom currents (< 0.034 m.s-1) and a frequent 42 occurrence of productive fronts in low chlorophyll-a areas (0.1-0.9 mg.m-3) to support a 43 successful...
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Ano: 2015 URL: https://archimer.ifremer.fr/doc/00228/33947/32262.pdf
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Potential feeding and spawning habitats of Atlantic bluefin tuna in the Mediterranean Sea ArchiMer
Druon, Jean-noel; Fromentin, Jean-marc; Aulanier, Florian; Heikkonen, Jukka.
Atlantic bluefin tuna Thunnus thynnus (ABFT) is a fish of high market value which has recently become strongly overexploited, notably in the Mediterranean Sea. This area is an essential habitat for ABFT reproduction and growth. We present here an approach for deriving the daily mapping of potential ABFT feeding and spawning habitats based on satellite-derived sea surface temperature (SST) and chl a concentration. The feeding habitat was mainly derived from the simultaneous occurrence of oceanic fronts of temperature and chl a content while the spawning habitat was mostly inferred from the heating of surface waters. Generally, higher chl a contents were found to be preferred for the feeding habitat and a minimum SST value was found for the spawning habitat....
Tipo: Text Palavras-chave: Habitat mapping; Bluefin tuna; Thunnus thynnus; Feeding; Spawning; Mediterranean Sea; Remote sensing; Satellite data.
Ano: 2011 URL: http://archimer.ifremer.fr/doc/00049/16053/13549.pdf
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The efficiency of using remote sensing for fisheries enforcement:Application to the Mediterranean bluefin tuna fishery ArchiMer
Cicuendez Perez, Juan; Alvarez, Marlene Alvarez; Heikkonen, Jukka; Guillen Garcia, Jordi; Barbas, Thomas.
This paper analyzes the impact of applying vessel detection technology using satellite images (vessel detection system, VDS) to complement air patrols for fisheries enforcement and control. Due to limited fisheries enforcement budgets there is the need to allocate costs efficiently among competing control tools. This paper focuses on assessing the benefits of using VDS jointly with VMS (vessel monitoring system) and air patrol surveillance to improve effectiveness of controls. A statistical model to estimate the number of inspections was developed and was used with enforcement costs data as reported by a number of EU countries. The result of applying VDS in fisheries enforcement is presented in one of the most demanding fisheries enforcement contexts: the...
Tipo: Text Palavras-chave: Vessel detection system; Synthetic Aperture Radar; Illegal fishing; Cost-benefit analysis; Bluefin tuna.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00141/25205/23389.pdf
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