期刊
PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES
卷 288, 期 1954, 页码 -出版社
ROYAL SOC
DOI: 10.1098/rspb.2021.0475
关键词
ocean acidification; farming; predation; prey; bottom-up processes; top-down processes
资金
- Australian Research Council [FT120100183]
- Future Fellowship grant [FT0991953]
- ARC [DP150104263]
- Science without Borders Ph.D. scholarship through CAPES (Coordination for the Improvement of Higher Education Personnel) Brazil [13058134]
This study reveals a novel mechanism where a keystone herbivore mediates bottom-up and top-down processes simultaneously under future ocean acidification, resulting in altered food web interactions and predator populations.
Negative interactions among species are a major force shaping natural communities and are predicted to strengthen as climate change intensifies. Similarly, positive interactions are anticipated to intensify and could buffer the consequences of climate-driven disturbances. We used in situ experiments at volcanic CO2 vents within a temperate rocky reef to show that ocean acidification can drive community reorganization through indirect and direct positive pathways. A keystone species, the algal-farming damselfish Parma alboscapularis, enhanced primary productivity through its weeding of algae whose productivity was also boosted by elevated CO2. The accelerated primary productivity was associated with increased densities of primary consumers (herbivorous invertebrates), which indirectly supported increased secondary consumers densities (predatory fish) (i.e. strengthening of bottom-up fuelling). However, this keystone species also reduced predatory fish densities through behavioural interference, releasing invertebrate prey from predation pressure and enabling a further boost in prey densities (i.e. weakening of top-down control). We uncover a novel mechanism where a keystone herbivore mediates bottom-up and top-down processes simultaneously to boost populations of a coexisting herbivore, resulting in altered food web interactions and predator populations under future ocean acidification.
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