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Registros recuperados: 9
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A new approach to recruitment overfishing diagnosis based on fish condition from survey data ArchiMer
Ordines, Francesc; Lloret, Josep; Tugores, Pilar; Manfredi, Chiara; Guijarro, Beatriz; Jadaud, Angelique; Porcu, Cristina; Gil De Sola, Luis; Carlucci, Roberto; Sartini, Marina; Isajlovic, Igor; Massutti, Enric.
A new approach to recruitment overfishing diagnosis is presented. We hypothesize that condition of recruits should increase when recruitment failures are caused by fishing activity. This would be a consequence of the increase in trophic resource availability, because the population is smaller than that which the ecosystem could support. Temporal series of hake recruit condition were calculated from MEDITS survey data collected in Mediterranean geographical sub-areas (GSAs) 1, 6, 17 and 19 from 1994 to 2015. Multiple linear regressions were used to analyse the relationship between mean annual condition and abundance of recruits and climatic indices in each GSA. Significant correlations were only detected in GSA 6, where 69% of condition variability was...
Tipo: Text Palavras-chave: Merluccius merluccius; Fishery; Recruits; Condition index; Recruitment overfishing; MEDITS survey.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00513/62458/66762.pdf
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Coherent assessments of Europe's marine fishes show regional divergence and megafauna loss ArchiMer
Fernandes, Paul G.; Ralph, Gina M.; Nieto, Ana; Criado, Mariana Garcia; Vasilakopoulos, Paraskevas; Maravelias, Christos D.; Cook, Robin M.; Pollom, Riley A.; Kovacic, Marcelo; Pollard, David; Farrell, Edward D.; Florin, Ann-britt; Polidoro, Beth A.; Lawson, Julia M.; Lorance, Pascal; Uiblein, Franz; Craig, Matthew; Allen, David J.; Fowler, Sarah L.; Walls, Rachel H. L.; Comeros-raynal, Mia T.; Harvey, Michael S.; Dureuil, Manuel; Biscoito, Manuel; Pollock, Caroline; Phillips, Sophy R. Mccully; Ellis, Jim R.; Papaconstantinou, Constantinos; Soldo, Alen; Keskin, Cetin; Knudsen, Steen Wilhelm; Gil De Sola, Luis; Serena, Fabrizio; Collette, Bruce B.; Nedreaas, Kjell; Stump, Emilie; Russell, Barry C.; Garcia, Silvia; Afonso, Pedro; Jung, Armelle B. J.; Alvarez, Helena; Delgado, Joao; Dulvy, Nicholas K.; Carpenter, Kent E..
Europe has a long tradition of exploiting marine fishes and is promoting marine economic activity through its Blue Growth strategy. This increase in anthropogenic pressure, along with climate change, threatens the biodiversity of fishes and food security. Here, we examine the conservation status of 1,020 species of European marine fishes and identify factors that contribute to their extinction risk. Large fish species (greater than 1.5 m total length) are most at risk; half of these are threatened with extinction, predominantly sharks, rays and sturgeons. This analysis was based on the latest International Union for Conservation of Nature (IUCN) European regional Red List of marine fishes, which was coherent with assessments of the status of fish stocks...
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Ano: 2017 URL: http://archimer.ifremer.fr/doc/00416/52739/53608.pdf
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Do changes in environmental and fishing pressures impact marine communities? An empirical assessment ArchiMer
Rochet, Marie-joelle; Trenkel, Verena; Carpentier, Andre; Coppin, Franck; Gil De Sola, Luis; Leaute, Jean-pierre; Mahe, Jean-claude; Maiorano, Porzia; Mannini, Alessandro; Murenu, Matteo; Piet, Gerjan; Politou, Chrissi-yianna; Reale, Bruno; Spedicato, Maria-teresa; Tserpes, George; Bertrand, Jacques.
P>1. The development of ecosystem approaches to environmental management implies the need to account for multiple pressures on ecosystems. Trends in multiple metrics that respond differently to changes in major environmental pressures need to be combined to evaluate the impacts of fishing and environmental changes on fish communities. 2. An exploited fish community is viewed as a three-level food chain in which the two upper levels, or functional groups, are targeted by fishing fleets, while the lowest level is subject to environmental variation. Qualitative modelling is used to predict changes at the two upper levels, that is, top-down vs. bottom-up perturbations. Abundance and length metrics are calculated from survey data for 14 Mediterranean and...
Tipo: Text Palavras-chave: Bottom-up control; Community metrics; Compensation; Ecosystem approach to fisheries; Ecosystem assessment; Functional groups; Groundfish community; Mediterranean; North Atlantic; Top-down control.
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00008/11925/8637.pdf
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Do population and community metrics tell the same story about recent changes in Northern Mediterranean fish communities? ArchiMer
Rochet, Marie-joelle; Trenkel, Verena; Gil De Sola, Luis; Politou, Chrissi-yianna; Tserpes, George; Bertrand, Jacques.
This document presents a comparative study of human impacts on the length-structure of fish communities across North-Mediterranean ecosystems. We use survey data to examine trends in length-based metrics and their consistency within and among the two levels of organisation populations and communities, and to suggest interpretations of observed trend combinations. We start from a set of population processes potentially affected by human pressures: fishing will induce mortality especially in target species, whereas the hydrological environment and eutrophication potentially affect recruitment and individual growth. How population changes will be reflected at the community level is expected to depend on community evenness. Based on this expectation, a...
Tipo: Text Palavras-chave: Community metrics; Ecosystem approach to fisheries; Fish community; Length-based metrics; Mediterranean; Survey data.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/00133/24377/22389.pdf
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International bottom trawl survey in the Mediterranean (Medits), Instruction manual - Version 5 ArchiMer
Bertrand, Jacques; Souplet, Arnauld; Gil De Sola, Luis; Relini, Giulio; Politou, Chrissi-yianna.
This document is the fifth version of a manual elaborated in the frame of an international project to harmonise the samplings by bottom trawling of the demersal resources in the Mediterranean Sea (MEDITS program). It is the reference document for the surveys to be conducted from 2007 onwards by the research institutes contributing in the Medits surveys on the continental shelves and slopes in the Mediterranean (Fig. 1). The manual describes the sampling gear characteristics, the sampling methodology and the treatment of the samples. Finally it gives the specifications of the data files for data storage and exchange.
Tipo: Text
Ano: 2007 URL: http://archimer.ifremer.fr/doc/00002/11321/7850.pdf
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Large-scale distribution of a deep-sea megafauna community along Mediterranean trawlable grounds ArchiMer
Fernandez-arcaya, Ulla; Bitetto, Isabella; Esteban, Antonio; Farriols, M. Teresa; García-ruiz, Cristina; Gil De Sola, Luis; Guijarro, Beatriz; Jadaud, Angelique; Kavadas, Stefanos; Lembo, Giuseppe; Milisenda, Giacomo; Maina, Irida; Petovic, Slavica; Sion, Letizia; Vaz, Sandrine; Massutí, Enric.
The large-scale distribution pattern of megafauna communities along the Mediterranean middle slope was explored. The study was conducted between 500 and 800 m depth where deep-water fishery occurs. Although community studies carried out deeper than 500 m are partly available for some geographic areas, few large-scale comparative studies have been carried out. Within the framework of the MEDITS survey programme, we compared the megafauna community structure in ten geographical sub-areas (GSAs) along the Mediterranean coasts. Additionally, the spatial distribution of fishing was analysed using vessel monitoring by satellite information. Overall, the community showed a significant difference between sub-areas, with a decreasing eastward pattern in abundance...
Tipo: Text Palavras-chave: Distribution pattern; Fishing impact; Continental slope; Deep sea; Megafauna; Red shrimp; Community.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00489/60051/63328.pdf
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Large-Scale Diversity of Slope Fishes: Pattern Inconsistency between Multiple Diversity Indices ArchiMer
Gaertner, Jean-claude; Maiorano, Porza; Merigot, Bastien; Colloca, Francesco; Politou, Chrissi-yianna; Gil De Sola, Luis; Bertrand, Jacques; Murenu, Matteo; Durbec, Jean-pierre; Kallianiotis, Argyris; Mannini, Alessandro.
Large-scale studies focused on the diversity of continental slope ecosystems are still rare, usually restricted to a limited number of diversity indices and mainly based on the empirical comparison of heterogeneous local data sets. In contrast, we investigate large-scale fish diversity on the basis of multiple diversity indices and using 1454 standardized trawl hauls collected throughout the upper and middle slope of the whole northern Mediterranean Sea (36 degrees 3' - 45 degrees 7' N; 5 degrees 3'W - 28 degrees E). We have analyzed (1) the empirical relationships between a set of 11 diversity indices in order to assess their degree of complementarity/redundancy and (2) the consistency of spatial patterns exhibited by each of the complementary groups of...
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Ano: 2013 URL: http://archimer.ifremer.fr/doc/00152/26299/24392.pdf
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Reproducibility of the multi-component aspect of species diversity across different areas and scales: towards the constitution of a shortlist of complementary indices for monitoring fish diversity? ArchiMer
Gaertner, Jean-claude; Merigot, Bastien; Relini, Giulio; Bertrand, Jacques; Mazouni, Nabila; Politou, Chrissi-yianna; Gil De Sola, Luis; Kallianiotis, Argyris; Carpentieri, Paolo; Murenu, Matteo; Durbec, Jean-pierre; Vrgoc, Nedo; Ungaro, Nicola.
Recent theoretical and field studies conducted in both terrestrial and marine ecosystems have suggested that diversity could be a more complex and multi-component concept than previously thought. However, it is still poorly understood to what extent the information provided by the various indices is complementary with regard to diversity, and to what extent this complementarity is reproducible in different situations or at different scales of observation. In the present work, we have analysed the reproducibility of the empirical relationships between 11 diversity indices related to four major aspects (components) of species diversity (species richness, rarity, evenness and species taxonomy) in order to determine whether there is a general pattern of...
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Ano: 2010 URL: http://archimer.ifremer.fr/doc/00029/14064/11382.pdf
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Size-dependent survival of European hake juveniles in the Mediterranean Sea ArchiMer
Hidalgo, Manuel; Ligas, Alessandro; Maria Bellido, Jose; Bitetto, Isabella; Carbonara, Pierluiggi; Carlucci, Roberto; Guijarro, Beatriz; Jadaud, Angelique; Lembo, Giuseppe; Manfredi, Chiara; Esteban, Antonio; Garofalo, Germana; Ikica, Zdravko; Garcia, Cristina; Gil De Sola, Luis; Kavadas, Stefanos; Maina, Irida; Sion, Letizia; Vittori, Stefania; Vrgoc, Nedo.
Most studies on European hake focus on the recruitment process and nursery areas, whereas the information is comparatively limited on the ecology of the juvenile stage (ca. second year of life)-the one most exploited by the Mediterranean trawl fisheries. Using information of the MEDITS programme, we provide a spatial and temporal assessment of the influence of body size and growth on hake survival from recruits (age 0) to juveniles (age 1), along with the impact of surface temperature and chlorophyll variability. At a biogeographic scale, size-dependent survival is supported, with areas with higher mean length of recruits and juveniles yielding higher survival. A similar pattern was observed at interannual level in some western Mediterranean areas, also...
Tipo: Text Palavras-chave: Juvenile survival; European hake; Mediterranean Sea; Size dependence.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00600/71229/69590.pdf
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