El pastoreo del microzooplancton (< 200 m) sobre el fitoplancton, juega un papel importante en la trofodinámica del sistema pelágico. Para determinar la relevancia de este proceso en Bahía Concepción, se utilizaron la clorofila-a estimada por cromatografía líquida de alta resolución (HPLC) y la microscopía para determinar las tasas de crecimiento del fitoplancton y pastoreo por el microzooplancton obtenidas con la técnica de dilución. El crecimiento del fitoplancton y pastoreo por el microzooplancton fue evaluado en la región media de la bahía.
Résultats de la recherche
Showing items 1 through 9 of 6.-
Library ResourceArticles et Livresjanvier, 2008Mexique
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Library ResourceArticles et Livresmai, 2007Pérou, Amérique centrale, Amérique du Sud
People’s perceptions of their environment
in high mountain rangelands ultimately
affect the fragile ecosystems on which
they depend, and thus their welfare. This is
especially true in developing countries,
where the livelihoods of people living in such ecosystems depend on grazing
livestock. The present study, conducted in the central mountain region of Peru, used photographs and Q methodology to investigate the criteria and preferences that shepherds and local administrators apply in making
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Library ResourceArticles et Livresseptembre, 2007Pérou, Amérique centrale, Amérique du Sud
Livestock play an important role for poor rural households in regions such as the Peruvian Andes. Research methods leading to a better understanding of the role of livestock in household poverty dynamics, and what better targeted policies and interventions may enhance that role, however, are not readily available. We utilized multiple methods, including Stages-of-Progress and household surveys, which gave us a combination of qualitative and quantitative results.
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Library ResourceArticles et Livresdécembre, 2007Pérou, Amérique du Sud
For some fifteen years, dairy cattle farming has been considerably developing in various parts of the Andes. Milk is transformed into cheese or sold fresh, giving rural families a regular income which secures their food supply. The stock-rearing practices in these Andean dairying systems are unrecognized and are often considered, wrongly, as underperforming and inadequate.
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Library ResourceArticles et Livresdécembre, 2007Pérou, Amérique du Sud
For some fifteen years, dairy cattle farming has been considerably developing in various parts of the Andes. Milk is transformed into cheese or sold fresh, giving rural families a regular income which secures their food supply. The stock-rearing practices in these Andean dairying systems are unrecognized and are often considered, wrongly, as underperforming and inadequate.
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Library ResourceDocuments de politique et mémoiresdécembre, 2007Suisse, Sénégal, Amérique septentrionale, Afrique, Asie, Europe
La herramienta de mapeo (o cartográfica) del WOCAT/LADA se basa en el cuestionario de mapeo original del WOCAT (WOCAT, 2007). Este ha sido ampliado para prestar más atención a cuestiones como la degradación biológica e hídrica y hacer más hincapié en las causas directas y socioeconómicas de esos fenómenos, incluyendo los impactos sobre los servicios ecosistémicos. Se evalúa el tipo de degradación de la tierra que esta ocurriendo actualmente, dónde y por qué ocurre y qué se hace al respecto en términos de Manejo Sustentable de Tierras (SLM), bajo la forma de un cuestionario.
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