Herbivory and nutrients shape grassland soil seed banks
Description
Anthropogenic nutrient enrichment and shifts in herbivory can lead to dramatic changes in the composition and diversity of aboveground plant communities which, in turn, can alter cryptic biodiversity storage, seed banks, in the soil. We used data from seven Nutrient Network grassland sites on four continents, encompassing a range of climatic and environmental conditions, to test the joint effects of fertilization and aboveground mammalian herbivory on seed banks and on the similarity between aboveground plant communities and seed banks. Fertilization decreased plant species richness and diversity in seed banks, and homogenized composition between aboveground and seed bank communities. Fertilization increased seed bank abundance especially in the presence of herbivores, while this effect was smaller in the absence of herbivores. Our findings highlight that nutrient enrichment can weaken the temporal storage effect as a diversity maintaining mechanism and that herbivory needs to be considered when assessing nutrient enrichment effects on seed bank abundance.
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- 10.5061/dryad.w0vt4b8x1 (DOI)