The Experts below are selected from a list of 321 Experts worldwide ranked by ideXlab platform

Claire Saraux - One of the best experts on this subject based on the ideXlab platform.

  • concomitant changes in the environment and small Pelagic Fish community of the gulf of lions
    Progress in Oceanography, 2020
    Co-Authors: Guillaume Feuilloley, Jeanmarc Fromentin, Lars Stemmann, Herve Demarcq, Claude Estournel, Claire Saraux
    Abstract:

    Abstract An important decrease in small Pelagic Fish condition and size has been observed in the most productive ecosystem of the Mediterranean Sea, the Gulf of Lions, since 2008, leading to an important Fishery crisis. Previous studies suggested bottom-up control to be the most probable cause for these changes. Here, we investigate whether an environmental change might have caused such a situation. In the absence of zooplankton time series, this study aims at describing temporal changes in key abiotic factors for the planktonic and Fish production of the Gulf of Lions, such as SST, meso-scale fronts, wind-induced coastal upwelling, river discharge, water stratification and deep convection and then at understanding potential link on Chl-a concentration as well as small Pelagic Fish populations. Our results indicate that the environmental conditions have broadly changed in the Gulf of Lion, with a major change in the mid-2000s, affecting the Chla concentration (which showed a regime shift in 2007), but also the SST, the upwelling and frontal activities, the Rhone river discharge (and particularly the N and P nutrients inputs) as well as the deep winter convection. Those changes could have affected the plankton production and consequently the small Pelagic Fish community that displayed similar patterns of variations as the environmental conditions.

Joshua P. Stone - One of the best experts on this subject based on the ideXlab platform.

Andre E Punt - One of the best experts on this subject based on the ideXlab platform.

  • bayesian posterior prediction of the patchy spatial distributions of small Pelagic Fish in regions of suitable habitat
    Canadian Journal of Fisheries and Aquatic Sciences, 2015
    Co-Authors: Charlotte Boyd, Mathieu Woillez, Sophie Bertrand, Ramiro Castillo, Arnaud Bertrand, Andre E Punt
    Abstract:

    Small Pelagic Fish aggregate within areas of suitable habitat to form patchy distributions with localized peaks in abundance. This presents challenges for geostatistical methods designed to investigate the processes underpinning the spatial distribution of stocks and simulate distributions for further analysis. In two-stage models, presence–absence is treated as separable and independent from the process explaining nonzero densities. This is appropriate where gaps in the distribution are attributable to one process and conditional abundance to another, but less so where patchiness is attributable primarily to the strong schooling tendencies of small Pelagic Fish within suitable habitat. We therefore developed a new modelling framework based on a truncated Gaussian random field (GRF) within a Bayesian framework. We evaluated this method using simulated test data and then applied it to acoustic survey data for Peruvian anchoveta (Engraulis ringens). We assessed the method’s performance in terms of posterior...

Isabel Palomera - One of the best experts on this subject based on the ideXlab platform.

  • Small Pelagic Fish in the NW Mediterranean Sea: An ecological review
    Progress in Oceanography, 2020
    Co-Authors: Isabel Palomera, M P Olivar, Jordi Salat, Ana Sabates, Marta Coll, Alberto Garcia, B. Morales-nin
    Abstract:

    20 pages, 9 figures.-- Printed version published in issue Aug-Sep 2007.-- Issue title: "Ecological Functioning of the Iberian Seas: A synthesis of GLOBEC Research in Spain and Portugal".Full-text version available Open Access at: http://www.icm.csic.es/files/oce/almacen/papers/AR-2007-23.pdfIn the NW Mediterranean Sea, anchovy (Engraulis encrasicolus) and sardine (Sardina pilchardus) are the most important small Pelagic Fish in terms of biomass and commercial interest. Round sardinella (Sardinella aurita) and Sprat (Sprattus sprattus) are also present in this region. This paper provides a general insight into the ecology of these species through a revision of the information available in an environmental context and in relation to exploitation features. Spawning habitats of the two main species, anchovy and sardine, are clearly differentiated based on water mass characteristics reducing the overlapping between their early developmental stages. Larval distribution is also related to major productivity mechanisms of the respective spawning seasons. In spite of the different environmental regimes in which larvae of these species develop, growth rates are fairly similar. Trophic modeling highlights the important ecological role of small Pelagic Fish in North Western Mediterranean ecosystems. This review points out the gaps in knowledge necessary to understand the dynamics of small Pelagic Fish in the region and to progress towards a precautionary and adaptive management.Peer reviewe

  • Who is to blame? Plausible pressures on small Pelagic Fish population changes in the northwestern Mediterranean Sea
    Marine Ecology Progress Series, 2019
    Co-Authors: Marta Coll, Isabel Palomera, Marta Albo-puigserver, Joan Navarro, Jeffrey M. Dambacher
    Abstract:

    Contribution to the Theme Section ‘Drivers of dynamics of small Pelagic Fish resources: biology, management and human factors’.-- 18 pages, 4 figures, 8 tables

  • feeding strategies and ecological roles of three predatory Pelagic Fish in the western mediterranean sea
    Deep-sea Research Part Ii-topical Studies in Oceanography, 2017
    Co-Authors: Joan Navarro, Marta Coll, Raquel Saezliante, Marta Albopuigserver, Isabel Palomera
    Abstract:

    Knowing the feeding ecology of marine predators is pivotal to developing an understanding of their ecological role in the ecosystem and determining the trophic relationships between them. Despite the ecological importance of predatory Pelagic Fish species, research on these species in the Mediterranean Sea is limited. Here, by combining analyses of stomach contents and stable isotope values, we examined the feeding strategies of swordFish, Xiphias gladius, little tunny, Euthynnus alletteratus and Atlantic bonito, Sarda sarda, in the western Mediterranean Sea. We also compared the trophic niche and trophic level of these species with published information of other sympatric Pelagic predators present in the ecosystem. Results indicated that, although the diet of the three species was composed mainly by fin-Fish species, a clear segregation in their main feeding strategies was found. SwordFish showed a generalist diet including demersal species such as blue whiting, Micromesistius poutassou, and European hake, Merluccius merluccius, and Pelagic fin-Fish such as barracudina species (Arctozenus risso and Lestidiops jayakari) or small Pelagic Fish species. Little tunny and Atlantic bonito were segregated isotopically between them and showed a diet basically composed of anchovy, Engraulis encrasicolus, and round sardinella, Sardinella aurita, and sardines, Sardina pilchardus, respectively. This trophic segregation, in addition to potential segregation by depth, is likely a mechanism that allows their potential coexistence within the same Pelagic habitat. When the trophic position of these three predatory Pelagic Fish species is compared with other Pelagic predators such as bluefin tuna, Thunnus thynnus, and dolphinFish, Coryphaena hippurus, present in the western Mediterranean Sea, we found that they show similar intermediate trophic position in the ecosystem. In conclusion, the combined stomach and isotopic results highlight, especially for little tunny and Atlantic bonito, the trophic importance of Clupeoid species in their diet. In addition, the importance of demersal resources for swordFish provides evidence for the Pelagic-demersal coupling of the ecosystem and the need to manage marine resources in an integrated way.

  • small Pelagic Fish in the nw mediterranean sea an ecological review
    Progress in Oceanography, 2007
    Co-Authors: Isabel Palomera, M P Olivar, Jordi Salat, Ana Sabates, Marta Coll, Alberto Garcia, Beatriz Moralesnin
    Abstract:

    Abstract In the NW Mediterranean Sea, anchovy (Engraulis encrasicolus) and sardine (Sardina pilchardus) are the most important small Pelagic Fish in terms of biomass and commercial interest. Round sardinella (Sardinella aurita) and Sprat (Sprattus sprattus) are also present in this region. This paper provides a general insight into the ecology of these species through a revision of the information available in an environmental context and in relation to exploitation features. Spawning habitats of the two main species, anchovy and sardine, are clearly differentiated based on water mass characteristics reducing the overlapping between their early developmental stages. Larval distribution is also related to major productivity mechanisms of the respective spawning seasons. In spite of the different environmental regimes in which larvae of these species develop, growth rates are fairly similar. Trophic modeling highlights the important ecological role of small Pelagic Fish in North Western Mediterranean ecosystems. This review points out the gaps in knowledge necessary to understand the dynamics of small Pelagic Fish in the region and to progress towards a precautionary and adaptive management.

Marta Coll - One of the best experts on this subject based on the ideXlab platform.

  • Small Pelagic Fish in the NW Mediterranean Sea: An ecological review
    Progress in Oceanography, 2020
    Co-Authors: Isabel Palomera, M P Olivar, Jordi Salat, Ana Sabates, Marta Coll, Alberto Garcia, B. Morales-nin
    Abstract:

    20 pages, 9 figures.-- Printed version published in issue Aug-Sep 2007.-- Issue title: "Ecological Functioning of the Iberian Seas: A synthesis of GLOBEC Research in Spain and Portugal".Full-text version available Open Access at: http://www.icm.csic.es/files/oce/almacen/papers/AR-2007-23.pdfIn the NW Mediterranean Sea, anchovy (Engraulis encrasicolus) and sardine (Sardina pilchardus) are the most important small Pelagic Fish in terms of biomass and commercial interest. Round sardinella (Sardinella aurita) and Sprat (Sprattus sprattus) are also present in this region. This paper provides a general insight into the ecology of these species through a revision of the information available in an environmental context and in relation to exploitation features. Spawning habitats of the two main species, anchovy and sardine, are clearly differentiated based on water mass characteristics reducing the overlapping between their early developmental stages. Larval distribution is also related to major productivity mechanisms of the respective spawning seasons. In spite of the different environmental regimes in which larvae of these species develop, growth rates are fairly similar. Trophic modeling highlights the important ecological role of small Pelagic Fish in North Western Mediterranean ecosystems. This review points out the gaps in knowledge necessary to understand the dynamics of small Pelagic Fish in the region and to progress towards a precautionary and adaptive management.Peer reviewe

  • Who is to blame? Plausible pressures on small Pelagic Fish population changes in the northwestern Mediterranean Sea
    Marine Ecology Progress Series, 2019
    Co-Authors: Marta Coll, Isabel Palomera, Marta Albo-puigserver, Joan Navarro, Jeffrey M. Dambacher
    Abstract:

    Contribution to the Theme Section ‘Drivers of dynamics of small Pelagic Fish resources: biology, management and human factors’.-- 18 pages, 4 figures, 8 tables

  • feeding strategies and ecological roles of three predatory Pelagic Fish in the western mediterranean sea
    Deep-sea Research Part Ii-topical Studies in Oceanography, 2017
    Co-Authors: Joan Navarro, Marta Coll, Raquel Saezliante, Marta Albopuigserver, Isabel Palomera
    Abstract:

    Knowing the feeding ecology of marine predators is pivotal to developing an understanding of their ecological role in the ecosystem and determining the trophic relationships between them. Despite the ecological importance of predatory Pelagic Fish species, research on these species in the Mediterranean Sea is limited. Here, by combining analyses of stomach contents and stable isotope values, we examined the feeding strategies of swordFish, Xiphias gladius, little tunny, Euthynnus alletteratus and Atlantic bonito, Sarda sarda, in the western Mediterranean Sea. We also compared the trophic niche and trophic level of these species with published information of other sympatric Pelagic predators present in the ecosystem. Results indicated that, although the diet of the three species was composed mainly by fin-Fish species, a clear segregation in their main feeding strategies was found. SwordFish showed a generalist diet including demersal species such as blue whiting, Micromesistius poutassou, and European hake, Merluccius merluccius, and Pelagic fin-Fish such as barracudina species (Arctozenus risso and Lestidiops jayakari) or small Pelagic Fish species. Little tunny and Atlantic bonito were segregated isotopically between them and showed a diet basically composed of anchovy, Engraulis encrasicolus, and round sardinella, Sardinella aurita, and sardines, Sardina pilchardus, respectively. This trophic segregation, in addition to potential segregation by depth, is likely a mechanism that allows their potential coexistence within the same Pelagic habitat. When the trophic position of these three predatory Pelagic Fish species is compared with other Pelagic predators such as bluefin tuna, Thunnus thynnus, and dolphinFish, Coryphaena hippurus, present in the western Mediterranean Sea, we found that they show similar intermediate trophic position in the ecosystem. In conclusion, the combined stomach and isotopic results highlight, especially for little tunny and Atlantic bonito, the trophic importance of Clupeoid species in their diet. In addition, the importance of demersal resources for swordFish provides evidence for the Pelagic-demersal coupling of the ecosystem and the need to manage marine resources in an integrated way.

  • small Pelagic Fish in the nw mediterranean sea an ecological review
    Progress in Oceanography, 2007
    Co-Authors: Isabel Palomera, M P Olivar, Jordi Salat, Ana Sabates, Marta Coll, Alberto Garcia, Beatriz Moralesnin
    Abstract:

    Abstract In the NW Mediterranean Sea, anchovy (Engraulis encrasicolus) and sardine (Sardina pilchardus) are the most important small Pelagic Fish in terms of biomass and commercial interest. Round sardinella (Sardinella aurita) and Sprat (Sprattus sprattus) are also present in this region. This paper provides a general insight into the ecology of these species through a revision of the information available in an environmental context and in relation to exploitation features. Spawning habitats of the two main species, anchovy and sardine, are clearly differentiated based on water mass characteristics reducing the overlapping between their early developmental stages. Larval distribution is also related to major productivity mechanisms of the respective spawning seasons. In spite of the different environmental regimes in which larvae of these species develop, growth rates are fairly similar. Trophic modeling highlights the important ecological role of small Pelagic Fish in North Western Mediterranean ecosystems. This review points out the gaps in knowledge necessary to understand the dynamics of small Pelagic Fish in the region and to progress towards a precautionary and adaptive management.