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Registros recuperados: 9
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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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Environmental drivers explain regional variation of changes in fish and invertebrate functional groups across the Mediterranean Sea from 1994 to 2012 ArchiMer
Brind'Amour, Anik; Rochet, Marie-joelle; Ordines, Francesc; Hosack, Geoff; Berthele, Olivier; Merigot, Bastien; Carbonara, Pierluigi; Follesa, Maria Cristina; Jadaud, Angelique; Lefkaditou, Evgenia; Maiorano, Porzia; Peristeraki, Panagiota; Mannini, Alessandro; Rabiller, Manuella; Spedicato, Maria Teresa; Tserpes, George; Trenkel, Verena.
Functional groups are sets of species that play a similar role in a food web. We defined functional groups of fish species based on their morphological characteristics, while using expert knowledge for invertebrates. We measured 9 morphological traits of 72 fish species, and carried out multivariate analyses to assign fish species to functional groups. The analysis identified 9 trait-based fish functional groups to which were added 3 expert-based invertebrate functional groups. The habitat (position in the water column) and potential diet of each group were identified from the literature. Using the MEDITS bottom trawl survey data collected at 10 to 800 m depth, we calculated relative change in the 12 fish and invertebrate functional group biomasses for 12...
Tipo: Text Palavras-chave: Morphological traits; Community models; Functional network; Functional groups; Mediterranean Sea; Temporal trends; Fish; Shellfish.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00363/47382/47475.pdf
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Environmentally driven synchronies of Mediterranean cephalopod populations ArchiMer
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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Large-scale spatio-temporal monitoring highlights hotspots of demersal fish diversity in the Mediterranean Sea ArchiMer
Granger, Victoria; Fromentin, Jean-marc; Bez, Nicolas; Relini, Giulio; Meynard, Christine N.; Gaertner, Jean-claude; Maiorano, Porzia; Garcia Ruiz, Cristina; Follesa, Cristina; Gristina, Michele; Peristeraki, Panagiota; Brind'Amour, Anik; Carbonara, Pierluigi; Charilaou, Charis; Esteban, Antonio; Jadaud, Angelique; Joksimovic, Aleksandar; Kallianiotis, Argyris; Kolitari, Jerina; Manfredi, Chiara; Massuti, Enric; Mifsud, Roberta; Quetglas, Antoni; Refes, Wahid; Sbrana, Mario; Vrgoc, Nedo; Spedicato, Maria Teresa; Merigot, Bastien.
Increasing human pressures and global environmental change may severely affect the diversity of species assemblages and associated ecosystem services. Despite the recent interest in phylogenetic and functional diversity, our knowledge on large spatio-temporal patterns of demersal fish diversity sampled by trawling remains still incomplete, notably in the Mediterranean Sea, one of the most threatened marine regions of the world. We investigated large spatio-temporal diversity patterns by analysing a dataset of 19,886 hauls from 10 to 800 m depth performed annually during the last two decades by standardized scientific bottom trawl field surveys across the Mediterranean Sea, within the MEDITS program. A multi-component (eight diversity indices) and...
Tipo: Text
Ano: 2015 URL: https://archimer.ifremer.fr/doc/00216/32743/31322.pdf
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Large-scale spatio-temporal patterns of Mediterranean cephalopod diversity ArchiMer
Kellerhttps://w3.ifremer.fr/archimer-admin/author.jsp#, Stefanie; Bartolino, Valerio; Hidalgo, Manuel; Bitetto, Isabella; Casciaro, Loredana; Cuccu, Danila; Esteban, Antonio; Garcia, Cristina; Garofalo, Germana; Josephides, Marios; Jadaud, Angelique; Lefkaditou, Evgenia; Maiorano, Porzia; Manfredi, Chiara; Marceta, Bojan; Massut, Enric; Micallef, Reno; Peristeraki, Panagiota; Relini, Giulio; Sartor, Paolo; Spedicato, Maria Teresa; Tserpes, George; Quetglas, Antoni.
Species diversity is widely recognized as an important trait of ecosystems’ functioning and resilience. Understanding the causes of diversity patterns and their interaction with the environmental conditions is essential in order to effectively assess and preserve existing diversity. While diversity patterns of most recurrent groups such as fish are commonly studied, other important taxa such as cephalopods have received less attention. In this work we present spatio-temporal trends of cephalopod diversity across the entire Mediterranean Sea during the last 19 years, analysing data from the annual bottom trawl survey MEDITS conducted by 5 different Mediterranean countries using standardized gears and sampling protocols. The influence of local and regional...
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Ano: 2016 URL: http://archimer.ifremer.fr/doc/00303/41407/40581.pdf
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Modelling spatio-temporal patterns of fish community size structure across the northern Mediterranean Sea: an analysis combining MEDITS survey data with environmental and anthropogenic drivers ArchiMer
Bitetto, Isabella; Romagnoni, Giovanni; Adamidou, Angeliki; Certain, Gregoire; Di Lorenzo, Manfredi; Donnaloia, Marilena; Lembo, Giuseppe; Maiorano, Porzia; Milisenda, Giacomo; Musumeci, Claudia; Ordines, Francesc; Pesci, Paola; Peristeraki, Panagiota; Pesic, Ana; Sartor, Paolo; Spedicato, Maria Teresa.
The state of marine systems subject to natural or anthropogenic impacts can be generally summarized by suites of ecological indicators carefully selected to avoid redundancy. Length-based indicators capture the status of fish community structure, fulfilling the Marine Strategy Framework Directive (MSFD) requirement for Descriptor 3 (status of commercial fish species). Although the MSFD recommends the development of regional indicators, a comparison among alternative length-based indicators is so far missing for the Mediterranean Sea. Using principal component analysis and dynamic factor analysis, we identified the most effective subset of length-based indicators, whether or not based on maximum length. Indicator trends and time series of fishing effort and...
Tipo: Text Palavras-chave: Demersal fish community; Size structure indicators; Geographical sub-area; Marine Strategy Framework Directive; Dynamic factor analysis; Redundancy analysis.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00599/71148/69466.pdf
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Morphological traits measured for 89 fish species sampled in the Mediterranean Sea during MEDITS scientific surveys ArchiMer
Brind'Amour, Anik; Mérigot, Bastien; Ordines, Francesc; Carbonara, Pierluigi; Follesa, Maria; Jadaud, Angelique; Maiorano, Porzia; Rabiller, Manuella; Denis, Axelle; Di Santo, Carla; Cavaillé, Thomas; Theil, Andréa; Spedicato, Maria Teresa.
The data come from organisms and pictures collected during the MEDITS annual bottom trawl surveys conducted between 2011 and 2013 (Bertrand et al. 2002). MEDITS surveys cover the continental shelf (10 m to 200 m depth) and the upper part of the continental slope (200 m to 800 m) on the Mediterranean. A total of 1511 individuals from 85 fish species were collected from seven Mediterranean areas (South Adriatic Sea, Sardinia, Gulf of Lions, around Cyprus, Mallorca, Tyrrhenian Sea, and North West Ionian Sea). A set of 14 morphological traits related to the habitat and the diet of the species were measured in the field and on pictures using the ImageJ software (version 1.47, http://imagej.nih.gov/ij/) (see Granger et al. 2015 and Brind'Amour et al. submitted...
Tipo: Dataset
Ano: 2016 URL: http://dx.doi.org/10.17882/41825
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Spatial distribution of marine macro-litter on the seafloor in the northern Mediterranean Sea: the MEDITS initiative ArchiMer
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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Stability of the relationships among demersal fish assemblages and environmental-trawling drivers at large spatio-temporal scales in the northern Mediterranean Sea ArchiMer
Mérigot, Bastien; Gaertner, Jean-claude; Brind’amour, Anik; Carbonara, Pierluigi; Esteban, Antonio; Garcia-ruiz, Cristina; Gristina, Michele; Imzilen, Taha; Jadaud, Angelique; Joksimovic, Aleksandar; Kavadas, Stefanos; Kolitari, Jerina; Maina, Irida; Maiorano, Porzia; Manfredi, Chiara; Micallef, Reno; Peristeraki, Panagiota; Relini, Giulio; Sbrana, Mario; Spedicato, Maria Teresa; Thasitis, Ioannis; Vittori, Stefania; Vrgoc, Nedo.
Trawling pressure and environmental changes may affect the composition of fish assemblages. Our knowledge on large spatio-temporal patterns of demersal fish composition remains incomplete for the Mediterranean Sea. We investigated (1) the spatio-temporal stability of demersal assemblages, (2) the relationships between these assemblages and potential structuring factors (trawling pressure and environmental conditions) in order to assess the dynamic of the assemblage structure at the scale of the northern Mediterranean Sea. We analysed a dataset of 18062 hauls from 10 to 800 m depth performed annually during the last two decades across 17 Geographical Sub-Areas (GSAs) (MEDITS program). A multi-table analysis (STATICO-CoA) evidenced a strong inter-GSAs...
Tipo: Text Palavras-chave: Species composition; Stability; Demersal assemblages; Environment; Fishing pressure; Large scale; Co-inertia analysis; STATICO-CoA.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00584/69629/67485.pdf
Registros recuperados: 9
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