Invasiveness in plant communities with feedbacks

Eppstein, Margaret J.; Molofsky, Jane

doi:10.1111/j.1461-0248.2007.01017.x

Cited by 83 publications

(119 citation statements)

References 52 publications

(66 reference statements)

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“…However, in contrast to previous continuous-time models [14,[16][17][18], we use a discrete-time approach that provides specific estimates of plant and soiltype biomass (e.g. A and SA; table 1) and is easily implemented in a spreadsheet.…”

Section: Methodsmentioning

confidence: 99%

“…As a result, current PSF models do not provide insight into plant productivity. A second problem is that current models are limited to two-and three-species systems and so do not allow insight across a range of diversities [14,[16][17][18]. Finally, PSF models have not been parameterized and tested, so their importance to plant productivity and community development remains largely untested (but see Kulmatiski et al [18]).…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…both positive and negative plant-soil interactions [14][15][16][17]). There is extensive conceptual and empirical support for the role of PSFs in processes of plant community development such as succession, invasion, abundance, persistence and diversity [14,16,18]. However, one problem for understanding the role of PSFs in diversityproductivity relationships is that current PSF models simulate plant proportional abundance, not plant biomass [15,16,18].…”

Section: Introductionmentioning

confidence: 99%

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Plant–soil feedbacks provide an additional explanation for diversity–productivity relationships

2012

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Plant -soil feedbacks (PSFs) have gained attention for their role in plant community dynamics, but their role in productivity has been overlooked. We developed and tested a biomass-specific, multi-species model to examine the role of PSFs in diversity -productivity relationships. The model predicts a negative relationship between PSFs and overyielding: plants with negative PSFs grow more in communities than in monoculture (i.e. overyield), and plants with positive PSFs grow less in communities than in monoculture (i.e. underyield). This effect is predicted to increase with diversity and saturate at low species richness because the proportion of 'self-cultivated' soils rapidly decreases as species are added to a community. Results in a set of glasshouse experiments supported model predictions. We found that PSFs measured in one experiment were negatively correlated with overyielding in three-species plant communities measured in a separate experiment. Furthermore, when parametrized with our experimental PSF data, our model successfully predicted species-level overyielding and underyielding. The model was less effective at predicting community-level overyielding and underyielding, although this appeared to reflect large differences between communities with or without nitrogen-fixing plants. Results provide conceptual and experimental support for the role of PSFs in diversity -productivity relationships.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Plant–soil feedbacks provide an additional explanation for diversity–productivity relationships

2012

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“…It has been recurrently concluded that invasion processes are often idiosyncratic and that a multifactorial understanding of particular cases (Kueffer, 2006;Orians et al, 1986;Shrader-Frechette, 2001) is therefore needed (Callaway and Maron, 2006;Eppstein and Molofsky, 2007;Williamson, 1996). For instance, the impact of herbivores on invasive species depends on soil fertility (Blumenthal, 2005), and this relation is further linked to propagule pressure (Sanders et al, 2007).…”

Section: Multifactorial Analyses Of Case Studiesmentioning

confidence: 99%

How to Achieve Effectiveness in Problem-Oriented Landscape Research: The Example of Research on Biotic Invasions

Kueffer¹,

Hadorn²

2008

Living Rev. Landscape Res.

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It is increasingly expected from environmental research such as landscape research that science directly contributes to the solving of pressing societal problems. However, despite increased efforts to direct research towards societal problems, it is not obvious if science has become more effective in supporting environmental problem-solving. We present in this article a framework that facilitates the analysis and design of problem-orientation in research fields. We then apply the proposed framework to a concrete example of a problem-oriented landscape research field -namely research on biotic invasions. Invasion research addresses the problem that some organisms, that have been introduced by humans to a new geographic area where they were previously not present, spread in the landscape and pose negative impacts.We argue that problem-oriented research is more than applied research. Besides research on specific questions it also encompasses boundary management, i.e., deliberations among experts and stakeholders on the framing of adequate research questions about processes, values and practices for effective problem-solving. We postulate that such research may assist problem-solving in three ways, by analysing causal relationships (systems knowledge), clarifying conflicts of interests and values (target knowledge), or contributing to the development of appropriate means for action (transformation knowledge).We show that over the past decades a broad range of different research approaches has emerged in the young field of invasion research in order to produce systems, target and transformation knowledge for invasive species management. Early research in the field was dominated by the development of systems knowledge, but increasingly the three knowledge forms are Boundary management in invasion research is mainly restricted to informal networks (communities of practice), while formal processes such as transdisciplinary research are scarce. We suggest that the paucity of structured and explicit boundary management processes will limit the future development of a more effective science for invasive species management. In particular, we envisage three obstacles that can only be removed through explicit boundary management. First, the existing theoretical frameworks are currently only partly able to integrate natural and social sciences research on the processes underlying invasions. Second, a clarification of the normative thinking about alien plant invasions is needed. Third, research on transformation knowledge has so far not fundamentally challenged the existing conceptual framing and institutional setup of invasive species management.

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Patterns of wide‐scale substitution within meadows of the seagrass Posidonia oceanica in NW Mediterranean Sea: invaders are stronger than natives

Montefalcone

Albertelli

Morri

et al. 2010

Aquatic Conservation

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ABSTRACT1. The endemic seagrass Posidonia oceanica meadows in the Mediterranean Sea are presently facing invasion by alien algal species, especially where they are already showing signs of regression as a result of other stresses. Regressed meadows may be recolonized by native or alien macrophytes that take the place of P. oceanica.2. The pattern and degree of substitution by either native (Cymodocea nodosa and Caulerpa prolifera) or alien (Caulerpa taxifolia and C. racemosa) species in 17 P. oceanica meadows along the coast of Liguria (Italy, NW Mediterranean) were investigated. The invaders were found to be stronger colonizers, in terms of habitat occupancy within meadows, than the natives.3. A set of indices was used to quantify biological invasion within the seagrass ecosystem and to explore the relationship between the meadow's state of health and the replacement by substitutes. The ecological status of the receiving habitat was shown to play a major role in modulating the spread of substitutes.4. Substitutes are thought likely to act simply as passengers of habitat degradation in deep meadows, where previous regression has increased the likelihood of their colonization, but could be the drivers for P. oceanica loss in shallow ones, where they settled even in healthy meadows thus starting the process of regression. Long term monitoring and sustained maintenance of healthy P. oceanica meadows appear to be the most effective management tools to contain the risk of ecological substitution.

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Invasiveness in plant communities with feedbacks

Cited by 83 publications

References 52 publications

Plant–soil feedbacks provide an additional explanation for diversity–productivity relationships

Plant–soil feedbacks provide an additional explanation for diversity–productivity relationships

How to Achieve Effectiveness in Problem-Oriented Landscape Research: The Example of Research on Biotic Invasions

Patterns of wide‐scale substitution within meadows of the seagrass Posidonia oceanica in NW Mediterranean Sea: invaders are stronger than natives

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