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DOI: 10.1371/journal.pone.0110419
论文题名:
Herbivore Impacts on Marsh Production Depend upon a Compensatory Continuum Mediated by Salinity Stress
作者: Jeremy D. Long; Laura D. Porturas
刊名: PLOS ONE
ISSN: 1932-6203
出版年: 2014
发表日期: 2014-10-13
卷: 9, 期:10
语种: 英语
英文关键词: Salinity ; Herbivory ; Marshes ; Plant resistance to abiotic stress ; Plant-herbivore interactions ; Mesocosms ; Fresh water ; Seeds
英文摘要: Plant communities are disturbed by several stressors and they are expected to be further impacted by increasing anthropogenic stress. The consequences of these stressors will depend, in part, upon the ability of plants to compensate for herbivory. Previous studies found that herbivore impacts on plants can vary from negative to positive because of environmental control of plant compensatory responses, a.k.a. the Compensatory Continuum Hypothesis. While these influential studies enhanced our appreciation of the dynamic nature of plant-herbivore interactions, they largely focused on the impact of resource limitation. This bias limits our ability to predict how other environmental factors will shape the impact of herbivory. We examined the role of salinity stress on herbivory of salt marsh cordgrass, Spartina foliosa, by an herbivore previously hypothesized to influence the success of restoration projects (the scale insect, Haliaspis spartinae). Using a combination of field and mesocosm manipulations of scales and salinity, we measured how these factors affected Spartina growth and timing of senescence. In mesocosm studies, Spartina overcompensated for herbivory by growing taller shoots at low salinities but the impact of scales on plants switched from positive to neutral with increasing salinity stress. In field studies of intermediate salinities, scales reduced Spartina growth and increased the rate of senescence. Experimental salinity additions at this field site returned the impact of scales to neutral. Because salinity decreased scale densities, the switch in impact of scales on Spartina with increasing salinity was not simply a linear function of scale abundance. Thus, the impact of scales on primary production depended strongly upon environmental context because intermediate salinity stress prevented plant compensatory responses to herbivory. Understanding this context-dependency will be required if we are going to successfully predict the success of restoration efforts and the ecological consequences of anthropogenic disturbances.
URL: http://journals.plos.org/plosone/article/file?id=10.1371/journal.pone.0110419&type=printable
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/18406
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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作者单位: Biology Department and Coastal & Marine Institute Laboratory, San Diego State University, San Diego, California, United States of America;Biology Department and Coastal & Marine Institute Laboratory, San Diego State University, San Diego, California, United States of America

Recommended Citation:
Jeremy D. Long,Laura D. Porturas. Herbivore Impacts on Marsh Production Depend upon a Compensatory Continuum Mediated by Salinity Stress[J]. PLOS ONE,2014-01-01,9(10)
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