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Book (series)Introdução à avaliação de mananciais de peixes tropicales. Parte 1. Manual. (French version not published) 1997Na Parte 1, o Manual, uma seleção de métodos de avaliação de mananciais é descrita com pormenor, com exemplos de cálculos. É dada ênfase especial a métodos aplicados a pescarias tropicais, isto é, aos baseados em análises de distribuição de frequências de comprimento. Depois de uma curta introdução à estatística, é feita uma abordagem da estimação dos parâmetros de crescimento e taxas de mortalidade, métodos de população virtual (incluindo métodos baseados em comprimentos e idades), selectividad e de métodos de pesca, modelo de capturas por recruta de Beverton e Holt, estimação da captura máxima sustentável usando modelos de produção geral, problemas de múltiplas espécies e frotas, avaliação de mananciais migratórios, uma discussão da relação manancial/recrutamento e a condução de levantamentos com arrasto de fundo. É explicada, ainda, a relação entre este manual e o pacote de software “Length Frequency Stock Assessment” (LFSA) para microcomputadores. Finalmente o manual apresenta uma l ista extensiva de referências incluindo material para futura leitura. Na Parte 2, Exercícios, é dado um número de exercícios com soluções. Os exercícios estão directamente relacionados com os diferentes capítulos e secções do manual.
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Book (stand-alone)Fish stock assessment manual 2003
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This manual starts with an introduction to the mathematical models applied in fish stock assessment. The basic assumptions about a model and the concepts of variation rates of a characteristic in relation to time are presented. The concept of cohort and models for the individual growth of the cohort are developed. In the chapter concerning the study of the stock, the fishing pattern and its components are defined, the most used models for the stock-recruitment relation are presented, as well as the short- and long-term projections of a stock. With regard to fishing resources management, the discussion is focused on the biological reference points. Finally, the general methods of estimating parameters are described, with special relevance to the cohort analysis by age and length. Then a solution of the exercises from the last course held in IPIMAR, is presented by the author and the scientist Manuela Azevedo. -
Book (stand-alone)Measuring and modelling soil carbon stocks and stock changes in livestock production systems - Guidelines for assessment. Version 1 2019
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No results found.These guidelines are a product of the Livestock Environmental Assessment and Performance (LEAP) Partnership, a multi-stakeholder initiative whose goal is to improve the environmental sustainability of the livestock supply chains through better methods, metrics and data. These guidelines provide a harmonized, international approach for estimating soil organic carbon (SOC) stock and stock changes in livestock production systems. The intended uses of this document are all those having an interest in quantifying soil carbon stocks or stock changes. Wide is the range of objectives and scales for SOC stock change studies, for example: Global or regional accounting for GHG emissions and removals from the land sector as a component of climate change accounting; Monitoring, reporting and verification obligations for the United Nations Framework Convention on Climate Change; Analysis of the climate change impact of livestock products; Evaluation of the environmental impacts of grazing land management for animal agriculture; Assessment of the mitigation potential of agricultural practices at an industry, region or farm scale; Implementing mitigation options in an emissions trading or other market mechanism where payments for SOC sequestration depend on accurate and verifiable quantification; Research into soil and biological processes affecting SOC stocks and dynamics. A set of methods and approaches are recommended for use by individual farmers or land managers, by those undertaking life cycle assessment of livestock products, policy makers, or regulators at local, regional or national scales.
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