2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/21/2018 | 3:00 PM - 3:15 PM | THE INFLUENCE OF NUTRIENT ENRICHMENT OF RIVERINE FOOD WEB RESILIENCE | 310 B
THE INFLUENCE OF NUTRIENT ENRICHMENT OF RIVERINE FOOD WEB RESILIENCE
Eutrophication is one of the most ubiquitous anthropogenic stresses altering the structure and function of communities and ecosystems. Excess nutrients clearly alter community composition and productivity, but how do these changes alter the distribution of energy flow within stream food webs and thus the ability of those communities to recover from disturbance? We used ecological network analysis (ENA) to examine the emergent properties of 12 quantitative food webs across a nutrient enrichment gradient in the Manawatu, New Zealand. Nutrient enrichment resulted in communities composed of energy inefficient species with high community (excluding microbes) respiration. Community respiration was several times greater in enriched communities and this may drive hypoxic conditions even without concomitant changes in microbial respiration. Enriched communities also had weaker trophic cascades, which may yield greater robustness to energy flow loss. Interestingly, enriched communities were also more structurally and functionally affected by species sensitive to flow disturbance making these communities more vulnerable to floods.
- Disturbance
- Modeling
- Network
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Presenters/Authors
Russell Death
(), Massey University, r.death@massey.ac.nz;
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Adam Canning
(), Massey University, acanning@fishandgame.org.nz;
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