Contribution of water birds to nutrient loading to the ecosystem of mesotrophic reservoir

Gwiazda, Robert

doi:ISSN 0420-9036

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Title: Contribution of water birds to nutrient loading to the ecosystem of mesotrophic reservoir

Abstract:

One gram of the faeces of the black-headed gull (Larus ridibundus L.) and of mallard (Anas platyrhynchos L.) contains 78.6 mg P and 72.4 mg N and 8.5 mg P and 53.1 mg N respectively. The gull and the mallard defecated 0.96 g P and 0.88 g of N and 0.42 and 2.62 g per day per individual respectively. The participation of waterfowl in the nutrient loading to the reservoir was small (less than 1% of only inorganic P and N). The mallard significantly affects phosphorus and nitrogen cycling in the reservoir, and the gulls increase the phosphorus resources there.

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