期刊
MARINE ENVIRONMENTAL RESEARCH
卷 126, 期 -, 页码 95-108出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.marenvres.2017.02.003
关键词
Habitat fragmentation; Disturbance; Food-webs; Plant-herbivore interactions; Stoichiornetry; Amphipod; Epiphytes; Seagrass
资金
- Christina Menendez Fellowship program
Habitat fragmentation impacts ecosystem functioning in many ways, including reducing the availability of suitable habitat for animals and altering resource dynamics. Fragmentation in seagrass ecosystems caused by propeller scarring is a major source of habitat loss, but little is known about how scars impact ecosystem functioning. Propeller scars were simulated in seagrass beds of Abaco, Bahamas, to explore potential impacts. To determine if plant-herbivore interactions were altered by fragmentation, amphipod grazers were excluded from half the experimental plots, and epiphyte biomass and community composition were compared between grazer control and exclusion plots. We found a shift from light limitation to phosphorus limitation at seagrass patch edges. Fragmentation did not impact top-down control on epiphyte biomass or community composition, despite reduced amphipod density in fragmented habitats. Seagrass and amphipod responses to propeller scarring suggest that severely scarred seagrass beds could be subject to changes in internal nutrient stores and amphipod distribution. (C) 2017 Elsevier Ltd. All rights reserved.
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