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Eutrophication Effects on Ecosystem Dynamics and Producer Isotope Ratios

This study explores the consequences of eutrophication on ecosystem behavior, focusing on changes in primary producers' relative abundances and nutrient ratios. We model how eutrophication impacts nitrogen-to-phosphorus (N:P) ratios in primary producers, aligning them with specific "Redfield ratios." Additionally, we examine shifts in seagrass δ13C values due to increased discrimination against 13C in low light, as well as changes in δ15N for primary producers. Our methodology incorporates random sampling of benthic coverage and detailed monitoring of fish and invertebrate populations.

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Eutrophication Effects on Ecosystem Dynamics and Producer Isotope Ratios

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  1. Explicit model of ecosystem behavior #1 Eutrophication will lead to changes in relative abundances of primary producers in a predictable way.

  2. Explicit model of ecosystem behavior #2 Eutrophication will shift N:P ratios of primary producers towards a taxon-specific “Redfield ratio”

  3. Explicit model of ecosystem behavior #3 Eutrophication will shift seagrass d13C towards more negative values because of increased discrimination against 13C in low light conditions

  4. Not-so-Explicit model of ecosystem behavior #4 Eutrophication will cause some kind of change in d15N of primary producers

  5. Control Treatment 25cm x 25cm randomly placed for benthic coverage 25cm x 25cm set sites for benthic coverage Elemental ratio, stable isotope sampling 10cm x 10cm randomly placed for canal wall coverage

  6. We will also specifically identify and count the conspicuous fish and invertebrates along each transect

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