Herbivore effects on plant species density at varying productivity levels
Ecology
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Abstract
Artificially increasing primary productivity decreases plant species richness in many habitats; herbivory may affect this outcome, but it has rarely been directly addressed in fertilization studies. This experiment was conducted in two Louisiana coastal marshes to examine the effects of nutrient enrichment and sediment addition on herbaceous plant communities with and without vertebrate herbivory. After three growing seasons, fertilization increased community biomass in all plots, but decreased species density (the number of species per unit area) only in plots protected from herbivory. Herbivory alone did not alter species density at either site. At the brackish marsh, herbivory caused a shift in dominance in the fertilized plots from a species that is considered the competitive dominant, but is selectively eaten, to another less palatable species. At the fresh marsh, increased dead biomass in the absence of herbivory and in the fertilized plots probably contributed to the decrease in species density, perhaps by limiting germination of annuals. Our results support those of other fertilization studies in which plant species density decreases with increased biomass, but only in those plots protected from herbivory.
Suggested Citation
Gough, L., Grace, J., 1998, Herbivore effects on plant species density at varying productivity levels: Ecology, v. 79, no. 5, p. 1586-1594, https://doi.org/10.1890/0012-9658(1998)079[1586:HEOPSD]2.0.CO;2.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Herbivore effects on plant species density at varying productivity levels |
| Series title | Ecology |
| DOI | 10.1890/0012-9658(1998)079[1586:HEOPSD]2.0.CO;2 |
| Volume | 79 |
| Issue | 5 |
| Year Published | 1998 |
| Language | English |
| Publisher | Ecological Society of America |
| Contributing office(s) | National Wetlands Research Center |
| Description | 9 p. |
| First page | 1586 |
| Last page | 1594 |
| Country | United States |
| State | Louisiana |
| Other Geospatial | Pearl River Basin |