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globalchange > 过去全球变化的重建

DOI:	10.1371/journal.pone.0115858
论文题名:	Consumer Depletion Alters Seagrass Resistance to an Invasive Macroalga
作者:	Sarah Caronni; Chiara Calabretti; Maria Anna Delaria; Giuseppe Bernardi; Augusto Navone; Anna Occhipinti-Ambrogi; Pieraugusto Panzalis; Giulia Ceccherelli
刊名:	PLOS ONE
ISSN:	1932-6203
出版年:	2015
发表日期:	2015-2-27
卷:	10, 期:2
语种:	英语
英文关键词:	Herbivory ; Algae ; Marine fish ; Invasive species ; Sediment ; Conservation science ; Leaves ; Marine ecosystems
英文摘要:	Few field studies have investigated how changes at one trophic level can affect the invasibility of other trophic levels. We examined the hypothesis that the spread of an introduced alga in disturbed seagrass beds with degraded canopies depends on the depletion of large consumers. We mimicked the degradation of seagrass canopies by clipping shoot density and reducing leaf length, simulating natural and anthropogenic stressors such as fish overgrazing and water quality. Caulerpa racemosa was transplanted into each plot and large consumers were excluded from half of them using cages. Potential cage artifacts were assessed by measuring irradiance, scouring by leaf movement, water flow, and sedimentation. Algal invasion of the seagrass bed differed based on the size of consumers. The alga had higher cover and size under the cages, where the seagrass was characterized by reduced shoot density and canopy height. Furthermore, canopy height had a significant effect depending on canopy density. The alteration of seagrass canopies increased the spread of C. racemosa only when large consumers were absent. Our results suggest that protecting declining habitats and/or restoring fish populations will limit the expansion of C. racemosa. Because MPAs also enhance the abundance and size of fish consuming seagrass they can indirectly promote algal invasion. The effects of MPAs on invasive species are context dependent and require balancing opposing forces, such as the conservation of seagrass canopy structure and the protection of fish grazing the seagrass.
URL:	http://journals.plos.org/plosone/article/file?id=10.1371/journal.pone.0115858&type=printable
Citation statistics:
资源类型:	期刊论文
标识符:	http://119.78.100.158/handle/2HF3EXSE/21053
Appears in Collections:	过去全球变化的重建影响、适应和脆弱性科学计划与规划气候变化与战略全球变化的国际研究计划气候减缓与适应气候变化事实与影响

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File Name/ File Size	Content Type	Version	Access	License
journal.pone.0115858.PDF（2453KB）	期刊论文	作者接受稿	开放获取	CC BY-NC-SA	View Download

作者单位:

Department of Earth and Environmental Sciences, University of Pavia, Via S. Epifanio14, I-27100 Pavia, Italy;Department of Earth and Environmental Sciences, University of Pavia, Via S. Epifanio14, I-27100 Pavia, Italy;Department of Science for Nature and Environmental Resources, University of Sassari, Via Piandanna 4, I-07100 Sassari, Italy;Marine Protected Area Tavolara Punta Coda Cavallo, Via Dante 1, I-07026 Olbia (OT), Italy;Marine Protected Area Tavolara Punta Coda Cavallo, Via Dante 1, I-07026 Olbia (OT), Italy;Department of Earth and Environmental Sciences, University of Pavia, Via S. Epifanio14, I-27100 Pavia, Italy;Marine Protected Area Tavolara Punta Coda Cavallo, Via Dante 1, I-07026 Olbia (OT), Italy;Department of Science for Nature and Environmental Resources, University of Sassari, Via Piandanna 4, I-07100 Sassari, Italy

Recommended Citation:

Sarah Caronni,Chiara Calabretti,Maria Anna Delaria,et al. Consumer Depletion Alters Seagrass Resistance to an Invasive Macroalga[J]. PLOS ONE,2015-01-01,10(2)

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