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| Keller, Stefanie; Quetglas, Antoni; Puerta, Patricia; Bitetto, Isabella; Casciaro, Loredana; Cuccu, Danila; Esteban, Antonio; Garcia, Cristina; Garofalo, Germana; Guijarro, Beatriz; Josephides, Marios; Jadaud, Angelique; Lefkaditou, Evgenia; Maiorano, Porzia; Manfredi, Chiara; Marceta, Bojan; Micallef, Reno; Peristeraki, Panagiota; Relini, Giulio; Sartor, Paolo; Spedicato, Maria Teresa; Tserpes, George; Hidalgo, Manuel. |
| The Mediterranean Sea is characterized by large scale gradients of temperature, productivity and salinity, in addition to pronounced mesoscale differences. Such a heterogeneous system is expected to shape the population dynamics of marine species. On the other hand, prevailing environmental and climatic conditions at whole basin scale may force spatially distant populations to fluctuate in synchrony. Cephalopods are excellent case studies to test these hypotheses owing to their high sensitivity to environmental conditions. Data of two cephalopod species with contrasting life histories (benthic octopus vs nectobenthic squid), obtained from scientific surveys carried out throughout the Mediterranean during the last 20 years were analyzed. The objectives of... |
| Tipo: Text |
Palavras-chave: Cephalopods; Mediterranean; MEDITS; Dynamic factor analysis; Synchrony; Octopus vulgaris; Illex coindetii. |
| Ano: 2017 |
URL: http://archimer.ifremer.fr/doc/00371/48207/48320.pdf |
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| Carbonara, Pierluigi; Zupa, Walter; Anastasopoulou, Aikaterini; Bellodi, Andrea; Bitetto, Isabella; Charilaou, Charis; Chatzispyrou, Archontia; Elleboode, Romain; Esteban, Antonio; Follesa, Maria Cristina; Isajlovic, Igor; Jadaud, Angelique; Garcia-ruiz, Cristina; Giannakaki, Amalia; Guijarro, Beatriz; Kiparissis, Sotiris Elias; Ligas, Alessandro; Mahe, Kelig; Massaro, Andrea; Medvesek, Damir; Mytilineou, Chryssi; Ordines, Francesc; Pesci, Paola; Porcu, Cristina; Peristeraki, Panagiota; Thasitis, Ioannis; Torres, Pedro; Spedicato, Maria Teresa; Tursi, Angelo; Sion, Letizia. |
| The uncertainty in age estimation by otolith reading may be at the root of the large variability in red mullet (Mullus barbatus) growth models in the Mediterranean. In the MEDITS survey, red mullet age data are produced following the same sampling protocol and otolith reading methodology. However, ageing is assigned using different interpretation schemes, including variations in theoretical birthdate and number of false rings considered, in addition to differences in the experience level of readers. The present work analysed the influence of these variations and the geographical location of sampling on red mullet ageing using a multivariate approach (principal component analysis). Reader experience was the most important parameter correlated with the... |
| Tipo: Text |
Palavras-chave: Mullus barbatus; Age variability; MEDITS; Mediterranean; Reader effect; False rings; Date of birth. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00591/70320/68356.pdf |
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| Galgani, Francois. |
| Cette étude traite de la problématique des macrodéchets en Méditerranée française, en précisant la nature, la distribution et les effets des déchets et en identifiant les méthodes, les acteurs et le cadre juridique. En mer, les données recueillies par l 'IFREMER au cours des campagnes de pêche (campagnes MEDITS) ont été analysées. Les résultats permettent de tirer un ensemble de conclusions : - les plastiques sont clairement les déchets les plus représentés en Méditerranée française. Ils représentent parfois plus de 80% des objets récoltés dans les chaluts et sont parfois plus importants en nombre et en poids que certaines espèces commerciales de poissons. - le plateau et la pente continentale de la Corse sont plus affectés que le golfe du Lion, - le... |
| Tipo: Text |
Palavras-chave: Déchets; Macro-déchets; Méditerranée; MEDITS; DCSMM. |
| Ano: 2011 |
URL: http://archimer.ifremer.fr/doc/00053/16434/13943.pdf |
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| Colloca, Francesco; Milisenda, Giacomo; Capezzuto, Francesca; Cau, Alessandro; Garofalo, Germana; Jadaud, Angelique; Kiparissis, Sotiris; Micallef, Reno; Montanini, Stefano; Thasitis, Ioannis; Vallisneri, Maria; Voliani, Alessandro; Vrgoc, Nedo; Zupa, Walter; Ordines, Rancesc. |
| In this study we investigated the spatio-temporal distribution of gurnards (8 species of Triglidae and one species of Peristediidae) in the northern Mediterranean Sea using 22 years of MEDITS bottom trawl survey data (1994-2015). Gurnards showed significant differences in terms of abundance, dominance and composition among geographical sub-areas and ecoregions, with the highest relative biomass (BIy) being found in Malta, eastern Corsica, the Balearic Islands and the eastern Ionian Sea. The lowest gurnards BIy were observed in the highly exploited areas of the western Mediterranean and the Adriatic Sea, where the largest number of species with a negative linear trend in BIy was also found. The temporal trends in species abundances highlighted a general... |
| Tipo: Text |
Palavras-chave: Triglidae; Mediterranean Sea; Trawl by-catch; MEDITS; Fishing pressure. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00486/59749/62855.pdf |
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| Spedicato, Maria Teresa; Zupa, Walter; Carbonara, Pierluigi; Fiorentino, Fabio; Follesca, Maria Cristina; Galgani, Francois; Garcia-ruiz, Cristina; Jadaud, Angelique; Ioakeimidis, Christos; Lazarakis, Giorgios; Lembo, Giuseppe; Mandic, Milica; Maiorano, Porzia; Sartini, Marina; Serena, Fabrizio; Cau, Alessandro; Esteban, Antonio; Isajlovic, Igor; Micallef, Reno; Thasitis, Ioannis. |
| Marine litter is one of the main sources of anthropogenic pollution in the marine ecosystem, with plastic representing a global threat. This paper aims to assess the spatial distribution of plastic macro-litter on the seafloor, identifying accumulation hotspots at a northern Mediterranean scale. Density indices (items km–2) from the MEDITS trawl surveys (years 2013-2015) were modelled by generalized additive models using a Delta-type approach and several covariates: latitude, longitude, depth, seafloor slope, surface oceanographic currents and distances from main ports. To set thresholds for the identification of accumulation areas, the percentiles (85th, 90th and 95th) of the plastic spatial density distribution were computed on the raster data. In the... |
| Tipo: Text |
Palavras-chave: Marine macro-litter; Plastic; Mediterranean Sea; GAM modelling; Accumulation areas; MEDITS. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00591/70319/68355.pdf |
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| Sioni, Letizia; Zupa, Walter; Calculli, Crescenza; Garofalo, Germana; Hidalgo, Manuel; Jadaud, Angelique; Lefkaditou, Evgenia; Ligas, Alessandro; Peristeraki, Panagiota; Bitetto, Isabella; Capezutto, Francesca; Carlucci, Roberto; Esteban, Antonio; Follesa, Cristina; Guijarro, Beatriz; Ikica, Zdravko; Isajlovic, Igor; Lembo, Giuseppe; Manfredi, Chiara; Perez, José Luiz; Porcu, Cristina; Thasitis, Ioannis; Tserpes, George; Carbonara, Pierluigi. |
| The present study provides updated information on the occurrence, abundance and biomass distribution patterns and length frequencies of Merluccius merluccius in the Mediterranean Sea, by analysing a time series of data from the Mediterranean International Trawl Surveys (MEDITS) from 1994 to 2015. The highest values of abundance and biomass were observed in the Sardinian Seas. The use of a generalized additive model, in which standardized biomass indices (kg km–2) were analysed as a function of environmental variables, explained how ecological factors could affect the spatio-temporal distribution of European hake biomass in the basin. High biomass levels predicted by the model were observed especially at 200 m depth and between 14°C and 18°C, highlighting... |
| Tipo: Text |
Palavras-chave: Merluccius merluccius; Distribution pattern; Environmental factors; MEDITS; Mediterranean Sea. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00591/70351/68419.pdf |
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| Farriols, M. Teresa; Ordines, Francesc; Carbonara, Pierluigi; Casciaro, Loredana; Di Lorenzo, Manfredi; Esteban, Antonio; Follesa, Cristina; García-ruiz, Cristina; Isajlovic, Igor; Jadaud, Angelique; Ligas, Alessandro; Manfredi, Chiara; Marceta, Bojan; Peristeraki, Panagiota; Vrgoc, Nedo; Massutí, Enric. |
| 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... |
| Tipo: Text |
Palavras-chave: Biodiversity; Fish assemblages; MEDITS; Bottom trawling; Fishing effort; Mediterranean Sea. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00584/69628/67484.pdf |
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