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Nitrogen addition enhances the bottom-up effects in the detrital food web
| First Author: |
Liu, SJ |
| Abstract: |
Bottom-up forces play a critical role in structuring communities and trophic interactions in detritus-based food webs, yet the impact of global change factors on these forces has been seldom explored. Here, we investigated the bottom-up effects of N-addition concentrations and methods (canopy and understory addition of N) on the trophic structure of detrital food webs comprising three trophic levels (saprotrophic fungi, Collembola and spiders) in a temperate and subtropical forest. At both forests, we found that high N concentrations significantly increased the concen-tration of litter N and saprotrophic fungi, and also increased Isotomidae collembolan density, but did not cascade up to the spider predator level. In contrast, the N addition methods had no sig-nificant impact on any component of trophic structure at either forest. In conclusion, N con-centration significantly influenced trophic structure by bottom-up effects. |
| Contact the author: |
Fu, SL |
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| Subject: |
Biodiversity Conservation; Ecology |
| Impact Factor: |
4 |
| Authors units: |
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| PubYear: |
2022 |
| Volume: |
39 |
| Publication Name: |
GLOBAL ECOLOGY AND CONSERVATION |
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