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• W2898091341 abstract "Human activities have substantially increased atmospheric nitrogen (N) deposition in ecosystems worldwide, often leading to higher plant quality for herbivores and greater herbivory. Predators frequently suppress herbivores and indirectly benefit plants via trophic cascades, and the strength of these interactions can also depend on N availability. However, the evidence for N deposition effects on cascades primarily comes from studies of high-level N deposition. Most terrestrial ecosystems currently receive elevated, but low-level N deposition, and it is unclear whether this subtle N enrichment has any effect on cascades. Here, I asked whether low-level N deposition alters a trophic cascade from black bears to plants in Colorado. In this ecological network, bears indirectly benefit plants by consuming ants and suppressing positive effects of ants on herbivores. Using a three year N enrichment experiment, I assessed changes in this cascade by measuring plant and arthropod responses to simulated N deposition, bear damage to ant nests, and the presence of mutualist herbivores and ants. I found that low-level N enrichment and bears had interacting effects on plant reproduction. In ambient N conditions, bears indirectly increased plant reproduction by causing ant nests to become inactive and suppressing positive ant effects on herbivores that were detrimental for plants. Yet, bear-induced ant nest inactivity had no effect on plant reproduction in N-enriched conditions. When N was added, ants had greater positive effects on herbivores, but herbivores had weak effects on plants, potentially because plants were more resistant to herbivores. Ultimately, the results indicate that N enrichment strengthened resource control of the community and weakened plant-herbivore interactions and the cascade from bears to plants. This study suggests that common rates of low-level N deposition are changing the strength of trophic cascades and may have already altered resource versus consumer control of ecological community structure in many ecosystems." @default.
• W2898091341 created "2018-11-02" @default.
• W2898091341 creator A5016781612 @default.
• W2898091341 date "2018-10-25" @default.
• W2898091341 modified "2023-10-05" @default.
• W2898091341 title "Short-term, low-level nitrogen deposition dampens a trophic cascade between bears and plants" @default.
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• W2898091341 doi "https://doi.org/10.1002/ece3.4593" @default.
• W2898091341 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6262928" @default.
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• W2898091341 hasPublicationYear "2018" @default.
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