Phosphorus,nitrogen, and carbon cycling by fish populations in two small lowland rivers in Poland |
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Authors: | T Penczak |
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Institution: | (1) Institute of Environmental Biology, University of Lód, Banacha 12/16, 90-237 Lód, Poland |
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Abstract: | Amounts of C, P, and N consumed by all fish populations were estimated at 9 sites in two small lowland rivers. They mainly depended on fish density and were: 151.8 (27.9–453.3) kgC ha–1a–1, 3.1(0.5–8.8) kgP ha–1 a–1, and 30.3 (5.3–89.9) kg N ha–1 a–1. To build one kg of each of these elements into their body the fish consumed 7.9 ± 1.7 (% MathType!MTEF!2!1!+-% feaafiart1ev1aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn% hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr% 4rNCHbGeaGak0Jf9crFfpeea0xh9v8qiW7rqqrFfpeea0xe9Lq-Jc9% vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x% fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGabeiEayaara% aaaa!3912!\{\text{\bar x}}\] ± S.D.) kg of C, 3.1 ± 0.8 kg of P, and 6.6 ± 1.3 kg of N. Thus, phosphorus was assimilated twice more efficiently than carbon and nitrogen. Pools of the three elements, calculated as mean biomass, are: 12.7 (1.2–42.1) kg C ha–1, 0.7(0.1–2.2) kgP ha–1, and 3.0 (0.3–9.7) kgN ha–1 The elements were assimilated especially effectively by young stages of fish. |
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Keywords: | phosphorus nitrogen carbon cycling pools utilization fish populations small river |
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