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Positive responses of coastal dune plants to soil conditioning by the invasive Lupinus nootkatensis. ACTA OECOLOGICA 2016. [DOI: 10.1016/j.actao.2016.08.007] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Zefferman E, Stevens JT, Charles GK, Dunbar-Irwin M, Emam T, Fick S, Morales LV, Wolf KM, Young DJN, Young TP. Plant communities in harsh sites are less invaded: a summary of observations and proposed explanations. AOB PLANTS 2015; 7:plv056. [PMID: 26002746 PMCID: PMC4497477 DOI: 10.1093/aobpla/plv056] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2015] [Accepted: 05/11/2015] [Indexed: 05/22/2023]
Abstract
Plant communities in abiotically stressful, or 'harsh', habitats have been reported to be less invaded by non-native species than those in more moderate habitats. Here, we synthesize descriptive and experimental evidence for low levels of invasion in habitats characterized by a variety of environmental stressors: low nitrogen; low phosphorus; saline, sodic or alkaline soils; serpentine soils; low soil moisture; shallow/rocky soils; temporary inundation; high shade; high elevation; and high latitude. We then discuss major categories of hypotheses to explain this pattern: the propagule limitation mechanism suggests invasion of harsh sites is limited by relatively low arrival rates of propagules compared with more moderate habitats, while invasion resistance mechanisms suggest that harsh habitats are inherently less invasible due to stressful abiotic conditions and/or increased effects of biotic resistance from resident organisms. Both propagule limitation and invasion resistance may simultaneously contribute to low invadedness of harsh sites, but the management implications of these mechanisms differ. If propagule limitation is more important, managers should focus on reducing the likelihood of propagule introductions. If invasion resistance mechanisms are in play, managers should focus on restoring or maintaining harsh conditions at a site to reduce invasibility.
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Affiliation(s)
- Emily Zefferman
- Department of Plant Sciences, University of California, Davis, CA 95616, USA Present address: Department of Earth and Planetary Sciences, University of Tennessee, Knoxville, TN 37917, USA
| | - Jens T Stevens
- Department of Plant Sciences, University of California, Davis, CA 95616, USA John Muir Institute for the Environment, University of California, Davis, CA 95616, USA
| | - Grace K Charles
- Department of Plant Sciences, University of California, Davis, CA 95616, USA
| | - Mila Dunbar-Irwin
- Department of Plant Sciences, University of California, Davis, CA 95616, USA
| | - Taraneh Emam
- Department of Plant Sciences, University of California, Davis, CA 95616, USA
| | - Stephen Fick
- Department of Plant Sciences, University of California, Davis, CA 95616, USA
| | - Laura V Morales
- Department of Plant Sciences, University of California, Davis, CA 95616, USA
| | - Kristina M Wolf
- Department of Plant Sciences, University of California, Davis, CA 95616, USA
| | - Derek J N Young
- Department of Plant Sciences, University of California, Davis, CA 95616, USA
| | - Truman P Young
- Department of Plant Sciences, University of California, Davis, CA 95616, USA
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Thorpe AS, Perakis S, Catricala C, Kaye TN. Nutrient limitation of native and invasive N2-fixing plants in northwest prairies. PLoS One 2013; 8:e84593. [PMID: 24386399 PMCID: PMC3874015 DOI: 10.1371/journal.pone.0084593] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2013] [Accepted: 11/21/2013] [Indexed: 11/26/2022] Open
Abstract
Nutrient rich conditions often promote plant invasions, yet additions of non-nitrogen (N) nutrients may provide a novel approach for conserving native symbiotic N-fixing plants in otherwise N-limited ecosystems. Lupinus oreganus is a threatened N-fixing plant endemic to prairies in western Oregon and southwest Washington (USA). We tested the effect of non-N fertilizers on the growth, reproduction, tissue N content, and stable isotope δ(15)N composition of Lupinus at three sites that differed in soil phosphorus (P) and N availability. We also examined changes in other Fabaceae (primarily Vicia sativa and V. hirsuta) and cover of all plant species. Variation in background soil P and N availability shaped patterns of nutrient limitation across sites. Where soil P and N were low, P additions increased Lupinus tissue N and altered foliar δ(15)N, suggesting P limitation of N fixation. Where soil P was low but N was high, P addition stimulated growth and reproduction in Lupinus. At a third site, with higher soil P, only micro- and macronutrient fertilization without N and P increased Lupinus growth and tissue N. Lupinus foliar δ(15)N averaged -0.010‰ across all treatments and varied little with tissue N, suggesting consistent use of fixed N. In contrast, foliar δ(15)N of Vicia spp. shifted towards 0‰ as tissue N increased, suggesting that conditions fostering N fixation may benefit these exotic species. Fertilization increased cover, N fixation, and tissue N of non-target, exotic Fabaceae, but overall plant community structure shifted at only one site, and only after the dominant Lupinus was excluded from analyses. Our finding that non-N fertilization increased the performance of Lupinus with few community effects suggests a potential strategy to aid populations of threatened legume species. The increase in exotic Fabaceae species that occurred with fertilization further suggests that monitoring and adaptive management should accompany any large scale applications.
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Affiliation(s)
- Andrea S. Thorpe
- Institute for Applied Ecology, Corvallis, Oregon, United States of America
| | - Steven Perakis
- United States Geological Survey, Forest and Rangeland Ecosystem Science Center, Corvallis, Oregon, United States of America
| | - Christina Catricala
- United States Geological Survey, Forest and Rangeland Ecosystem Science Center, Corvallis, Oregon, United States of America
| | - Thomas N. Kaye
- Institute for Applied Ecology, Corvallis, Oregon, United States of America
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Sardans J, Peñuelas J. The role of plants in the effects of global change on nutrient availability and stoichiometry in the plant-soil system. PLANT PHYSIOLOGY 2012; 160:1741-61. [PMID: 23115250 PMCID: PMC3510107 DOI: 10.1104/pp.112.208785] [Citation(s) in RCA: 126] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/09/2012] [Accepted: 10/29/2012] [Indexed: 05/21/2023]
Affiliation(s)
- Jordi Sardans
- Consejo Superior de Investigaciones Científicas, Global Ecology Unit, Centre de Recerca Ecològica i Aplicacions Forestats-Centre d'Estudis Avançats de Blanes-Universitat Autònoma de Barcelona, Cerdanyola del Vallès 08913, Catalonia, Spain.
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Perkins LB, Leger EA, Nowak RS. Invasion triangle: an organizational framework for species invasion. Ecol Evol 2012; 1:610-25. [PMID: 22393528 PMCID: PMC3287335 DOI: 10.1002/ece3.47] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2011] [Revised: 09/12/2011] [Accepted: 09/13/2011] [Indexed: 11/30/2022] Open
Abstract
Species invasion is a complex, multifactor process. To encapsulate this complexity into an intuitively appealing, simple, and straightforward manner, we present an organizational framework in the form of an invasion triangle. The invasion triangle is an adaptation of the disease triangle used by plant pathologists to help envision and evaluate interactions among a host, a pathogen, and an environment. Our modification of this framework for invasive species incorporates the major processes that result in invasion as the three sides of the triangle: (1) attributes of the potential invader; (2) biotic characteristics of a potentially invaded site; and (3) environmental conditions of the site. The invasion triangle also includes the impact of external influences on each side of the triangle, such as climate and land use change. This paper introduces the invasion triangle, discusses how accepted invasion hypotheses are integrated in this framework, describes how the invasion triangle can be used to focus research and management, and provides examples of application. The framework provided by the invasion triangle is easy to use by both researchers and managers and also applicable at any level of data intensity, from expert opinion to highly controlled experiments. The organizational framework provided by the invasion triangle is beneficial for understanding and predicting why species are invasive in specific environments, for identifying knowledge gaps, for facilitating communication, and for directing management in regard to invasive species.
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Affiliation(s)
- Lora B Perkins
- Department of Natural Resources and Environmental Science, University of Nevada Reno, Nevada
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