| Abstract: | Few studies have examined long-term ecological effects of sustained low-level nutrient enhancement on wetland biota. To determine sustained effects of phosphorus (P) addition on Everglades marshes we added P at low levels (5, 15, and 30 ??g L-1 above ambient) for 5 yr to triplicate 100-m flow-through channels in pristine marsh. A cascade of ecological responses occurred in similar sequence among treatments. Although the rate of change increased with dosing level, treatments converged to similar enriched endpoints, characterized most notably by a doubling of plant biomass and elimination of native, calcareous periphyton mats. The full sequence of biological changes occurred without an increase in water total P concentration, which remained near ambient levels until Year 5. This study indicates that Everglades marshes have a near-zero assimilative capacity for P without a state change, that ecosystem responses to enrichment accumulate over time, and that downstream P transport mainly occurs through biota rather than the water column. |
| Genre: | Article |
| ProdID: | 70028778 |
| Citation Author: | Gaiser, E. E.; Trexler, J. C.; Richards, J. H.; Childers, D. L.; Lee, D.; Edwards, A. L.; Scinto, L. J.; Jayachandran, K.; Noe, G. B.; Jones, R. D. |
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| Citation End Page: | 723 |
| Citation Issue: | 2 |
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| Citation Language: | English |
| Citation Larger Work Title: | Journal of Environmental Quality |
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| Citation Number Of Pages: | 7 |
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| Citation Search Results Text: | Cascading ecological effects of low-level phosphorus enrichment in the Florida Everglades; 2005; Article; Journal; Journal of Environmental Quality; Gaiser, E. E.; Trexler, J. C.; Richards, J. H.; Childers, D. L.; Lee, D.; Edwards, A. L.; Scinto, L. J.; Jayachandran, K.; Noe, G. B.; Jones, R. D. |
| Citation Start Page: | 717 |
| Citation Volume: | 34 |
| Citation Year: | 2005 |
| Type: | citation/reference |
| Text: | Cascading ecological effects of low-level phosphorus enrichment in the Florida Everglades; 2005; Article; Journal; Journal of Environmental Quality; Gaiser, E. E.; Trexler, J. C.; Richards, J. H.; Childers, D. L.; Lee, D.; Edwards, A. L.; Scinto, L. J.; Jayachandran, K.; Noe, G. B.; Jones, R. D. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Sat, 1 Jan 2005 00:00 -0600 |
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