| Abstract: | Nutrient excretion rates and the annual contribution of P from the feces of the gulls Larus argentatus and L. marinus (and of N from L. argentatus) to the nutrient budget of Gull Pond (Wellfleet), a soft water seepage lake, have been estimated. Intensive year-round gull counts by species were combined with determinations of defecation rate and the nutrient content of feces to quantitatively assess the P loading rates associated with regular gull use of this coastal pond on a seasonal and annual basis. Total P loading from gulls was estimated to be 52 kg yr?1, with 17 kg from L. argentatus and 35 kg from L. marinus, resulting from about 5.0 ? 106 h yr?1 and 1.7 ? 106 h yr?1 of pond use. This compares with P loading estimates of 67 kg yr?1 from upgradient septic systems, 2 kg yr?1 from precipitation and 3 kg yr?1 from unpolluted ground water. Fifty-six percent of annual gull P loading was associated with migratory activity in late fall. Estimated annual N loading by L. argentatus was 14 kg TKN, 206 g NO3-N, and 1.85 g g NH3-N. |
| Genre: | Article |
| ProdID: | 5223265 |
| Citation Author: | Portnoy, J. W.; Soukup, M. A. |
| Citation Contributing Office: | Patuxent Wildlife Research Center |
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| Citation End Page: | 69 |
| Citation Issue: | 1-2 |
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| Citation Language: | English |
| Citation Larger Work Title: | Hydrobiologia |
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| Citation Number Of Pages: | 9 |
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| Citation Phsyical Description: | 61-69 |
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| Citation Public Comments: | 3977_Portnoy.pdf |
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| Citation Search Results Text: | Gull contributions of phosphorus and nitrogen to a Cape Cod kettle pond; 1990; Article; Journal; Hydrobiologia; Portnoy, J. W.; Soukup, M. A. |
| Citation Start Page: | 61 |
| Citation Volume: | 202 |
| Citation Year: | 1990 |
| Type: | citation/reference |
| Text: | Gull contributions of phosphorus and nitrogen to a Cape Cod kettle pond; 1990; Article; Journal; Hydrobiologia; Portnoy, J. W.; Soukup, M. A. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DOCUMENT): | http://dx.doi.org/10.1007/BF00027092 |
| Date Other: | Wed, 16 Jun 2010 12:19 -0500 |
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