NDLI: Cascading predator control interacts with productivity to determine the trophic level of biomass accumulation in a benthic food web

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Cascading predator control interacts with productivity to determine the trophic level of biomass accumulation in a benthic food web

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Cascading predator control interacts with productivity to determine the trophic level of biomass accumulation in a benthic food web

Content Provider	Springer Nature Link
Author	Eriksson, Britas Klemens Rubach, Anja Batsleer, Jurgen Hillebrand, Helmut
Copyright Year	2011
Abstract	Large-scale exploitation of higher trophic levels by humans, together with global-scale nutrient enrichment, highlights the need to explore interactions between predator loss and resource availability. The hypothesis of exploitation ecosystems suggests that top–down and bottom–up control alternate between trophic levels, resulting in a positive relationship between primary production and the abundance of every second trophic level. Specifically, in food webs with three effective trophic levels, primary producers and predators should increase with primary production, while in food webs with two trophic levels, only herbivores should increase. We provided short-term experimental support for these model predictions in a natural benthic community with three effective trophic levels, where the number of algal recruits, but not the biomass of gastropod grazers, increased with algal production. In contrast, when the food web was reduced to two trophic levels by removing larger predators, the number of algal recruits was unchanged while gastropod grazer biomass increased with algal production. Predator removal only affected the consumer-controlled early life-stages of algae, indicating that both the number of trophic levels and the life-stage development of the producer trophic level determine the propagation of trophic cascades in benthic systems. Our results support the hypothesis that predators interact with resource availability to determine food-web structure.
Starting Page	203
Ending Page	210
Page Count	8
File Format	PDF
ISSN	09123814
Journal	Ecological Research
Volume Number	27
Issue Number	1
e-ISSN	14401703
Language	English
Publisher	Springer Japan
Publisher Date	2011-10-21
Publisher Place	Japan
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Interaction between top-down bottom-up control Trophic cascade Benthic food-web Marine eutrophication Baltic Sea Ecology Zoology Forestry Plant Sciences Evolutionary Biology Behavioural Sciences
Content Type	Text
Resource Type	Article
Subject	Ecology, Evolution, Behavior and Systematics

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