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Jouffre D.,Montpellier University | Borges M.D.F.,Institute Investigacao das Pescas e Do Mar IPIMAR INRB | Bundy A.,Bedford Institute of Oceanography | Coll M.,CSIC - Institute of Marine Sciences | And 7 more authors.
ICES Journal of Marine Science | Year: 2010

Under the context of an ecosystem approach to fisheries (EAF), there is keen interest in providing insights into the evolution of exploited ecosystems using simple ecosystem indicators. Many nations have long-term scientific research surveys, originally driven by conventional approaches in fisheries assessment and management. The aim of this study is to address the practical concerns linked to current objectives of monitoring simple EAF indicators, using data from surveys that were not historically designed for the purpose. Based on the results of an expert survey designed to collect expert knowledge on research surveys from scientists working on different ecosystems worldwide, a list of challenges faced during indicator estimation is highlighted, along with associated concerns and constraints. The work provides additional information useful in the interpretation of the results obtained on the state and trends of ecosystems using EAF indicators by the IndiSeas WG. Further, the related discussion provides potential pathways that could be useful for future research and development aiming to improve the ecosystem indicator approach in the operational context of EAF. The question of the utility for EAF of using historical dataseries of scientific trawl series is also discussed. Such long-term series are concluded to be useful, that they are even inescapable (since the past cannot be resamplied), and that EAF therefore brings a supplementary reason for continuing such monitoring and to incorporate new insights in how research surveys may be conducted. © 2009 International Council for the Exploration of the Sea. Published by Oxford Journals. All rights reserved. Source

Shin Y.-J.,Institute Of Recherche Pour Le Developpement | Shannon L.J.,University of Cape Town | Bundy A.,Bedford Institute of Oceanography | Coll M.,CSIC - Institute of Marine Sciences | And 24 more authors.
ICES Journal of Marine Science | Year: 2010

Background is provided to the selection of ecological indicators by the IndiSeas Working Group, and the methodology adopted for analysis and comparison of indicators across exploited marine ecosystems is documented. The selected indicators are presented, how they are calculated is explained, and the philosophy behind the comparative approach is given. The combination of selected indicators is intended to reflect different dynamics, tracking processes that display differential responses to fishing, and is meant to provide a complementary means of assessing marine ecosystem trends and states. IndiSeas relied on inputs and insights provided by the local experts from participating ecosystems, helping to understand state and trend indicators and to disentangle the effect of other potential ecosystem drivers, such as climate variability. This project showed that the use of simple and available indicators under an ecosystem approach can achieve a real, wide-reaching evaluation of marine ecosystem status caused by fishing. This is important because the socio-economics of areas where fishing activities develop differs significantly around the globe, and in many countries, insufficient data are available for complex and exhaustive analyses. © 2010 International Council for the Exploration of the Sea. Published by Oxford Journals. All rights reserved. Source

Trouillet B.,University of Nantes | Guineberteau T.,University of Nantes | Bernardon M.,British Petroleum | Le Roux S.,Center National Des Science Halieutiques Of Boussoura Cnshb
Marine Policy | Year: 2011

Maritime governance stakes are important in West Africa, if only due to the dominant role of fisheries, which coastal populations mainly depend on. In this context, with reference to the fishery sector mostly studied in two countries (Guinea and Mauritania), this paper aims to identify and synthesize the challenges to be met towards developing the governance of marine spaces. To this end, the analysis is based on field knowledge, which provides input into a grid set according to the various integration levels of the concept of ICZM. This paper thus reports the major methodological obstacles to be overcome, commensurate to the stakes insofar as marine policies can and must contribute to the economic and social development of this region. © 2010 Elsevier Ltd. Source

Le Fur J.,Montpellier SupAgro | Guilavogui A.,Center National Des Science Halieutiques Of Boussoura Cnshb | Teitelbaum A.,British Petroleum
Canadian Journal of Fisheries and Aquatic Sciences | Year: 2011

We assessed the quality of fishermen's local ecological knowledge, or LEK, as a potential source of information about coastal ecosystem functioning in the Republic of Guinea. Interviews were conducted by means of partial immersion or repeated surveys at six landing sites. In each site and for each topic, discussions were conducted with 3 to 15 individual fishermen and 1 to 10 groups of fishermen. Knowledge was obtained about habitats, substrate preferences, the location of nurseries, reproductive cycles, fish diet, and the trophic network of the Sciaenid community, the major resource for fisheries in this area. We systematically compared the reliability of the information collected with that of scientific information collected in parallel surveys or published data. The contribution of LEK should be considered on a case-by-case basis. Indeed, LEK could be used as (i) a supplementary source of scientific studies (seabed description), (ii) a basis for new scientific investigation (species reproductive cycle), (iii) the only possibility to obtain information (nursery location), (iv) a surrogate to scientific surveys providing an identical level of validity (fish diets) or a satisfactory proxy (trophic network) in a context of limited resources and data in which wide-ranging knowledge relating to the entire coast must be obtained. Source

Kleisner K.M.,National Oceanic and Atmospheric Administration | Coll M.,Institute Of Recherche Pour Le Developpement | Lynam C.P.,CEFAS - Center for Environment, Fisheries and Aquaculture Science | Bundy A.,Bedford Institute of Oceanography | And 23 more authors.
Ecosystem Services | Year: 2015

Fisheries provide critical provisioning services, especially given increasing human population. Understanding where marine communities are declining provides an indication of ecosystems of concern and highlights potential conflicts between seafood provisioning from wild fisheries and other ecosystem services. Here we use the nonparametric statistic, Kendall's tau, to assess trends in biomass of exploited marine species across a range of ecosystems. The proportion of 'Non-Declining Exploited Species' (NDES) is compared among ecosystems and to three community-level indicators that provide a gauge of the ability of a marine ecosystem to function both in provisioning and as a regulating service: survey-based mean trophic level, proportion of predatory fish, and mean life span. In some ecosystems, NDES corresponds to states and temporal trajectories of the community indicators, indicating deteriorating conditions in both the exploited community and in the overall community. However differences illustrate the necessity of using multiple ecological indicators to reflect the state of the ecosystem. For each ecosystem, we discuss patterns in NDES with respect to the community-level indicators and present results in the context of ecosystem-specific drivers. We conclude that using NDES requires context-specific supporting information in order to provide guidance within a management framework. © 2015 Elsevier B.V. Source

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