J Plant Ecol ›› 2018, Vol. 11 ›› Issue (1): 47-55.doi: 10.1093/jpe/rtx056

• Research Articles • Previous Articles     Next Articles

Small scale genotypic richness stabilizes plot biomass and increases phenotypic variance in the invasive grass Phalaris arundinacea

Alexandra R. Collins1, Brian Beckage2 and Jane Molofsky2,*   

  1. 1 Division of Information Technology and Science, Champlain College, 163 South Willard, Burlington, Vermont, 05401, USA; 2 Department of Plant Biology, University of Vermont, 111 Jeffords Hall, 63 Carrigan Drive, University of Vermont, Burlington, Vermont 05405, USA
  • Received:2016-06-06 Accepted:2017-10-05 Online:2017-10-09 Published:2018-01-18
  • Contact: Molofsky, Jane E-mail:Jane.Molofsky@uvm.edu

Abstract: Aims We aim to understand how small-scale genotypic richness and genotypic interactions influence the biomass and potential invasiveness of the invasive grass, Phalaris arundinacea under two different disturbance treatments: intact plots and disturbed plots, where all the native vegetation has been removed. Specifically, we address the following questions (i) Does genotypic richness increase biomass production? (ii) Do genotypic interactions promote or reduce biomass production? (iii) Does the effect of genotypic richness and genotypic interactions differ in different disturbance treatments? Finally (iv) Is phenotypic variation greater as genotypic richness increases?
Methods We conducted a 2-year common garden experiment in which we manipulated genotype richness using eight genotypes planted under both intact and disturbed conditions in a wetland in Burlington, Vermont (44°27′23″N, 73°11′29″W). The experiment consisted of a randomized complete block design of three blocks, each containing 20 plots (0.5 m 2) per disturbed treatment. We calculated total plot biomass and partitioned the net biodiversity effect into three components: dominance effect, trait-dependent complementarity and trait-independent complementarity. We calculated the phenotypic variance for each different genotype richness treatment under the two disturbance treatments.
Important findings Our results indicate that local genotypic richness does not increase total biomass production of the invasive grass P. arundinacea in either intact or disturbed treatments. However, genotypic interactions underlying the responses showed very different patterns in response to increasing genotypic richness. In the intact treatment, genotypic interactions resulted in the observed biomass being greater than the predicted biomass from monoculture plots (e.g., overyielding) and this was driven by facilitation. However, facilitation was reduced as genotypic richness increased. In the disturbed treatment, genotypic interactions resulted in underyielding with observed biomass being slightly less than expected from the performance of genotypes in monocultures; however, underyielding was reduced as genotypic richness increased. Thus, in both treatments, higher genotypic richness resulted in plot biomass nearing the additive biomass from individual monocultures. In general, higher genotypic richness buffered populations against interactions that would have reduced biomass and potentially spread. Phenotypic variance also had contrasting patterns in intact and disturbed treatments. In the intact treatment, phenotypic variance was low across all genotypic richness levels, while in the disturbed treatment, phenotypic variance estimates increased as genotypic richness increased. Thus, under the disturbed treatment, plots with higher genotypic richness had a greater potential response to selection. Therefore, limiting the introduction of new genotypes, even if existing genotypes of the invasive species are already present, should be considered a desirable management strategy to limit the invasive behavior of alien species.

Key words: invasive grass, genotypic diversity, Phalaris arundinacea, tripartite method, phenotypic variance

[1] Mark van Kleunen, Anna Meier, Moritz Saxenhofer, Markus Fischer. Support for the predictions of the pollinator-mediated stabilizing selection hypothesis [J]. J Plant Ecol, 2008, 1(3): 173-178.
Viewed
Full text


Abstract

Cited

  Shared   
  Discussed   
[1] Xie Zong-qiang Jiang Ming-xi. The Characteristics and Utilization of Shrub Vegetation in the Limestone Area of Sanxia Region[J]. Chin Bull Bot, 1995, 12(专辑2): 85 -89 .
[2] Ni Xin and Ma-Yu. Tissue Culture of Clematis coccines[J]. Chin Bull Bot, 1984, 2(23): 71 -73 .
[3] . [J]. Chin Bull Bot, 1996, 13(专辑): 67 -69 .
[4] ZHU Gen-Fa GUO Zhen-Fei. Progress on Molecular Biology of Main Ornamental Orchidaceae[J]. Chin Bull Bot, 2004, 21(04): 471 -477 .
[5] Zhang Zhen-jue. Seasonal Variation of Phloem Developmet and the Longevity of Sieve Elements in Perennial Plants[J]. Chin Bull Bot, 1991, 8(04): 21 -25 .
[6] Lu Shan-fa. The Pathways and Means of Plant Electrical Signal Transmission[J]. Chin Bull Bot, 1996, 13(04): 23 -27 .
[7] He Yi-kun Lu Tie-gang Sun Jing-san. Study on Cell and Tissue Culture in Lactucaindica[J]. Chin Bull Bot, 1991, 8(增刊): 55 -58 .
[8] Wang Fu-xiong and Chen Zu-keng. On problems of phylogeny of Gymnosperm[J]. Chin Bull Bot, 1983, 1(01): 4 -7 .
[9] Ni Dexiang Zhang Pifang Wang Kaiji and Bao Zihua. Effect of Different Wavelength of Light on Morphogenesis on the Test-tube Seedling of Stevia rebaudiana and Saint paulia ionatha[J]. Chin Bull Bot, 1984, 2(01): 39 -40 .
[10] Li Ling Pan Rui-chi. Study on Phytohormone Mutants[J]. Chin Bull Bot, 1994, 11(02): 26 -31 .