Inferring time-variable effects of nutrient enrichment on marine ecosystems using inverse modelling and ecological network analysis
Luong, A.D.; De Laender, F.; Olsen, Y; Vadstein, O; Dewulf, J.; Janssen, C.R. (2014). Inferring time-variable effects of nutrient enrichment on marine ecosystems using inverse modelling and ecological network analysis. Sci. Total Environ. 493: 708-718. dx.doi.org/10.1016/j.scitotenv.2014.06.027 In: Science of the Total Environment. Elsevier: Amsterdam. ISSN 0048-9697; e-ISSN 1879-1026, more |  |
| Keyword | | | Author keywords | Marine ecosystem; Nutrient enrichment; Linear inverse model; Ecologicalnetwork analysis; Carbon budget |
| Authors | | Top | - Luong, A.D., more
- De Laender, F., more
- Olsen, Y
| - Vadstein, O
- Dewulf, J., more
- Janssen, C.R., more
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| Abstract | We combined data from an outdoor mesocosm experiment with carbon budget modelling and an ecological network analysis to assess the effects of continuous nutrient additions on the structural and functional dynamics of a marine planktonic ecosystem. The food web receiving no nutrient additions was fuelled by detritus, as zooplankton consumed 7.2 times more detritus than they consumed algae. Nutrient supply instantly promoted herbivory so that it was comparable to detritivory at the highest nutrient addition rate. Nutrient-induced food web restructuring reduced carbon cycling and decreased the average number of compartments a unit flow of carbon crosses before dissipation. Also, the efficiency of copepod production, the link to higher trophic levels harvestable by man, was lowered up to 35 times by nutrient addition, but showed signs of recovery after 9 toll days. The dependency of the food web on exogenous input was not changed by the nutrient additions. |
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