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	Provedor de dados ArchiMer (2) Ecology and Society (1) Autor Bertrand, Jacques (2) Gil De Sola, Luis (2) Politou, Chrissi-yianna (2) Rochet, Marie-joelle (2) Trenkel, Verena (2) Tserpes, George (2) Carlson, Matthew; University of Alberta; mjc@ualberta.ca (1) Carpentier, Andre (1) Coppin, Franck (1) Leaute, Jean-pierre (1) Mahe, Jean-claude (1) Maiorano, Porzia (1) Mannini, Alessandro (1) Murenu, Matteo (1) Piet, Gerjan (1) Reale, Bruno (1) Schmiegelow, Fiona; University of Alberta; Fiona.schmiegelow@ualberta.ca (1) Spedicato, Maria-teresa (1) Mais... Palavra-chave Community metrics (3) Ecosystem approach to fisheries (2) Mediterranean (2) Allocation of sample effort (1) Boreal birds (1) Bottom-up control (1) Compensation (1) Cost-effective sample design (1) Ecosystem assessment (1) Fish community (1) Forest bird populations (1) Functional groups (1) Groundfish community (1) Length-based metrics (1) Long-term monitoring (1) North Atlantic (1) Partial derivatives (1) Power analysis (1) Sample error (1) Survey data (1) Mais... Tipo do documento Text (2) Peer-Reviewed Reports (1) Ano 2010 (1) 2007 (1) 2002 (1) País France (2) Canada (1) Idioma Inglês (3)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 3 Primeira ... 1 ... Última Cost-effective Sampling Design Applied to Large-scale Monitoring of Boreal Birds Ecology and Society Carlson, Matthew; University of Alberta; mjc@ualberta.ca; Schmiegelow, Fiona; University of Alberta; Fiona.schmiegelow@ualberta.ca. Despite their important roles in biodiversity conservation, large-scale ecological monitoring programs are scarce, in large part due to the difficulty of achieving an effective design under fiscal constraints. Using long-term avian monitoring in the boreal forest of Alberta, Canada as an example, we present a methodology that uses power analysis, statistical modeling, and partial derivatives to identify cost-effective sampling strategies for ecological monitoring programs. Empirical parameter estimates were used in simulations that estimated the power of sampling designs to detect trend in a variety of species’ populations and community metrics. The ability to detect trend with increased sample effort depended on the monitoring target’s... Tipo: Peer-Reviewed Reports Palavras-chave: Allocation of sample effort; Boreal birds; Community metrics; Cost-effective sample design; Forest bird populations; Long-term monitoring; Partial derivatives; Power analysis; Sample error; Temporal and spatial variation; Trend detection. Ano: 2002 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 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 Registros recuperados: 3 Primeira ... 1 ... Última

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