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Interspecific differences in the effect of fish on marine microbial plankton ArchiMer
Villeger, Sebastien; Fouilland, Eric; Argenty, Jeremy; Bouvier, Corinne; Carre, Claire; Bouvier, Thierry.
The productivity of most marine ecosystems is limited by the availability of dissolved nitrogen (N) and phosphorus (P). Nutrient recycling is therefore a key process for ecosystem functioning. Fish recycle nutrients through the excretion of ammonia and phosphate and can influence the abundance and community structure of primary producers such as phytoplankton. However, the effect of fish on other plankton compartments, and whether all fish species have similar effects, is largely unknown. We used a tank experiment to test how 2 Mediterranean fish species, gilthead seabream Sparus aurata and golden mullet Chelon auratus, with distinctly different N and P excretion rates, can affect the abundance and community structure of 3 plankton compartments:...
Tipo: Text Palavras-chave: Marine fish; Nutrient excretion; Protozooplankton; Phytoplankton; Bacteria.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00584/69659/67585.pdf
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Applying precision feeding techniques in growing-finishing pig operations R. Bras. Zootec.
Pomar,Cândido; Hauschild,Luciano; Zhang,Guo-Hua; Pomar,Jesus; Lovatto,Paolo Alberto.
The high cost of feed ingredients, the use of non-renewable sources of phosphate and the dramatic increase in the environmental load resulting from the excessive land application of manure are major challenges for the livestock industry. Precision feeding is proposed as an essential approach to improve the utilization of dietary nitrogen, phosphorus and other nutrients and thus reduce feeding costs and nutrient excretion. Precision feeding requires accurate knowledge of the nutritional value of feedstuffs and animal nutrient requirements, the formulation of diets in accordance with environmental constraints, and the gradual adjustment of the dietary nutrient supply to match the requirements of the animals. After the nutritional potential of feed...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Animal variability; Diet formulation; Nutrient excretion; Nutrient requirements; Production cost.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982009001300023
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