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Caiman crocodilus yacare in Controlled Experiment: Statistical Confirmation of its Contribution to the Balance of Nutrients in an Aquatic Ecosystem of Mato-Grossense Pantanal, Brazil

Author(s): Adelson Joel da Silva | Flávia Maria de Barros Nogueira | Joseana Luisa de Freitas | Josué Ribeiro da Silva Nunes

Journal: Engenharia Ambiental : Pesquisa e Tecnologia
ISSN 1678-2178

Volume: 7;
Issue: 1;
Start page: 59;
Date: 2010;
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Keywords: Pantanal | Limnology | Cayman Crocodilus yacare | Nutrients

This study has like purpose to confirm, statistically, through controlled experiments the contribution of Caiman crocodilus yacare for the nutrient cycling of the lake Baía das pedras, Pantanal de Poconé - MT. Studies with this focus, beginnings only on 90’s endings, on the lake, during dry phase were counted about 1000 individuals of Caiman crocodilus yacare on only 20.800 m2. On this period the productivity of the lake is very high in relation to high water period, when the water became transparent, being that the Caymans develop on that time a very important role. It was used for the experiment a captivity of 8x6 m, with only one exit for water. In the center of the captivity there is a pool with 4x2 m width and 30 cm of depth. The animal was putted after the stabilization of the limnological variables inside of the pool. It were collected 6 samples of water, being three before and three after of the presence of the Cayman. The Cayman with 2,18 m size, with 57,8 kg was feed every day, Just after the limnologicals determinations, with fresh fish of specie Prochilodus lineatus (including visceral parts). It were realized total nitrogen and phosphorous analyzes, ammonium, nitrate, nitrite and orthophosphate of the water collected from the pool. It was verified the important role of Cayman crocodilus yacare in the experiment and in the region where it leaves.
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