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Strauss AT, Hobbie SE, Reich PB, Seabloom EW, Borer ET. The effect of diversity on disease reverses from dilution to amplification in a 22-year biodiversity × N × CO 2 experiment. Sci Rep 2024; 14:10938. [PMID: 38740878 DOI: 10.1038/s41598-024-60725-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2023] [Accepted: 04/26/2024] [Indexed: 05/16/2024] Open
Abstract
Plant disease often increases with N, decreases with CO2, and increases as biodiversity is lost (i.e., the dilution effect). Additionally, all these factors can indirectly alter disease by changing host biomass and hence density-dependent disease transmission. Yet over long periods of time as communities undergo compositional changes, these biomass-mediated pathways might fade, intensify, or even reverse in direction. Using a field experiment that has manipulated N, CO2, and species richness for over 20 years, we compared severity of a specialist rust fungus (Puccinia andropogonis) on its grass host (Andropogon gerardii) shortly after the experiment began (1999) and twenty years later (2019). Between these two sampling periods, two decades apart, we found that disease severity consistently increased with N and decreased with CO2. However, the relationship between diversity and disease reversed from a dilution effect in 1999 (more severe disease in monocultures) to an amplification effect in 2019 (more severe disease in mixtures). The best explanation for this reversal centered on host density (i.e., aboveground biomass), which was initially highest in monoculture, but became highest in mixtures two decades later. Thus, the diversity-disease pattern reversed, but disease consistently increased with host biomass. These results highlight the consistency of N and CO2 as drivers of plant disease in the Anthropocene and emphasize the critical role of host biomass-despite potentially variable effects of diversity-for relationships between biodiversity and disease.
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Affiliation(s)
- Alexander T Strauss
- Department of Ecology, Evolution, and Behavior, University of Minnesota, St. Paul, MN, USA.
- Odum School of Ecology, University of Georgia, Athens, GA, USA.
- Center for the Ecology of Infectious Diseases, University of Georgia, Athens, GA, USA.
| | - Sarah E Hobbie
- Department of Ecology, Evolution, and Behavior, University of Minnesota, St. Paul, MN, USA
| | - Peter B Reich
- Department of Forest Resources, University of Minnesota, St. Paul, MN, USA
- Hawkesbury Institute for the Environment, Western Sydney University, Penrith, NSW, Australia
- Institute for Global Change Biology and School for Environment and Sustainability, University of Michigan, Ann Arbor, MI, USA
| | - Eric W Seabloom
- Department of Ecology, Evolution, and Behavior, University of Minnesota, St. Paul, MN, USA
| | - Elizabeth T Borer
- Department of Ecology, Evolution, and Behavior, University of Minnesota, St. Paul, MN, USA
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2
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Zaret M, Kinkel L, Borer ET, Seabloom EW. Plant growth-defense trade-offs are general across interactions with fungal, insect, and mammalian consumers. Ecology 2024; 105:e4290. [PMID: 38570923 DOI: 10.1002/ecy.4290] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/17/2023] [Revised: 12/14/2023] [Accepted: 02/09/2024] [Indexed: 04/05/2024]
Abstract
Plants face trade-offs between allocating resources to growth, while also defending against herbivores or pathogens. Species differences along defense trade-off axes may promote coexistence and maintain diversity. However, few studies of plant communities have simultaneously compared defense trade-offs against an array of herbivores and pathogens for which defense investment may differ, and even fewer have been conducted in the complex natural communities in which these interactions unfold. We tested predictions about the role of defense trade-offs with competition and growth in diversity maintenance by tracking plant species abundance in a field experiment that removed individual consumer groups (mammals, arthropods, fungi) and added nutrients. Consistent with a growth-defense trade-off, plant species that increased in mass in response to nutrient addition also increased when consumers were removed. This growth-defense trade-off occurred for all consumer groups studied. Nutrient addition reduced plant species richness, which is consistent with trade-off theory. Removing foliar fungi increased plant diversity via increased species evenness, whereas removal of other consumer groups had little effect on diversity, counter to expectations. Thus, while growth-defense trade-offs are general across consumer groups, this trade-off observed in wild plant communities does not necessarily support plant diversity maintenance.
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Affiliation(s)
- Max Zaret
- Department of Ecology, Evolution and Behavior, University of Minnesota, Saint Paul, Minnesota, USA
| | - Linda Kinkel
- Department of Plant Pathology, University of Minnesota, Saint Paul, Minnesota, USA
| | - Elizabeth T Borer
- Department of Ecology, Evolution and Behavior, University of Minnesota, Saint Paul, Minnesota, USA
| | - Eric W Seabloom
- Department of Ecology, Evolution and Behavior, University of Minnesota, Saint Paul, Minnesota, USA
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3
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Xu X, Yang L, Shen K, Cao H, Lin Y, Liu J, Han W. Nitrogen Addition and Heterotroph Exclusion Affected Plant Species Diversity-Biomass Relationship by Affecting Plant Functional Traits. PLANTS (BASEL, SWITZERLAND) 2024; 13:258. [PMID: 38256811 PMCID: PMC10818353 DOI: 10.3390/plants13020258] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/09/2023] [Revised: 01/03/2024] [Accepted: 01/11/2024] [Indexed: 01/24/2024]
Abstract
(1) Background: Heterotrophs can affect plant biomass and alter species diversity-productivity relationships. However, these studies were conducted in systems with a low nitrogen (N) availability, and it is unclear how heterotroph removal affects the relationship between plant species diversity and productivity in different N habitats. (2) Methods: Three typical understory herbaceous plants were selected to assemble the plant species diversity (three plant species richness levels (1, 2, and 3) and seven plant species compositions), and the control, insecticide, fungicide, and all removal treatments were performed at each plant species diversity level in systems with or without N addition treatments. (3) Results: In systems without N addition, the insecticide treatment increased the plant aboveground biomass, total biomass, and leaf area, while the fungicide treatment reduced the plant belowground biomass, root length, and root tip number; the presence of Bidens pilosa increased the plant aboveground biomass. Similarly, the presence of Bletilla striata increased the plant belowground biomass and root diameter under each heterotroph removal treatment. In systems with N addition, all removal treatments reduced the plant belowground biomass and increased the plant leaf area; the presence of B. pilosa significantly increased the plant aboveground biomass, total biomass, and root length under each heterotroph removal treatment. The presence of B. striata significantly increased the plant belowground biomass and leaf area under insecticide and fungicide treatments. (4) Conclusions: Heterotroph removal alters the plant species diversity-biomass relationship by affecting the plant functional traits in systems with different N availabilities. The impact of biodiversity at different trophic levels on ecosystem functioning should be considered under the background of global change.
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Affiliation(s)
- Xile Xu
- College of Life and Environmental Science, Wenzhou University, Wenzhou 325035, China; (X.X.); (L.Y.); (K.S.); (H.C.); (Y.L.); (J.L.)
| | - Luping Yang
- College of Life and Environmental Science, Wenzhou University, Wenzhou 325035, China; (X.X.); (L.Y.); (K.S.); (H.C.); (Y.L.); (J.L.)
| | - Kai Shen
- College of Life and Environmental Science, Wenzhou University, Wenzhou 325035, China; (X.X.); (L.Y.); (K.S.); (H.C.); (Y.L.); (J.L.)
| | - Huijuan Cao
- College of Life and Environmental Science, Wenzhou University, Wenzhou 325035, China; (X.X.); (L.Y.); (K.S.); (H.C.); (Y.L.); (J.L.)
| | - Yishi Lin
- College of Life and Environmental Science, Wenzhou University, Wenzhou 325035, China; (X.X.); (L.Y.); (K.S.); (H.C.); (Y.L.); (J.L.)
| | - Jinliang Liu
- College of Life and Environmental Science, Wenzhou University, Wenzhou 325035, China; (X.X.); (L.Y.); (K.S.); (H.C.); (Y.L.); (J.L.)
- Zhejiang Provincial Key Laboratory for Water Environment and Marine Biological Resources Protection, Wenzhou University, Wenzhou 325035, China
| | - Wenjuan Han
- College of Life and Environmental Science, Wenzhou University, Wenzhou 325035, China; (X.X.); (L.Y.); (K.S.); (H.C.); (Y.L.); (J.L.)
- Zhejiang Provincial Key Laboratory for Water Environment and Marine Biological Resources Protection, Wenzhou University, Wenzhou 325035, China
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4
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Dong X, Jiang F, Duan D, Tian Z, Liu H, Zhang Y, Hou F, Nan Z, Chen T. Contrasting Effects of Grazing in Shaping the Seasonal Trajectory of Foliar Fungal Endophyte Communities on Two Semiarid Grassland Species. J Fungi (Basel) 2023; 9:1016. [PMID: 37888272 PMCID: PMC10608051 DOI: 10.3390/jof9101016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2023] [Revised: 10/03/2023] [Accepted: 10/10/2023] [Indexed: 10/28/2023] Open
Abstract
Fungal endophytes are harboured in the leaves of every individual plant host and contribute to plant health, leaf senescence, and early decomposition. In grasslands, fungal endophytes and their hosts often coexist with large herbivores. However, the influence of grazing by large herbivores on foliar fungal endophyte communities remains largely unexplored. We conducted a long-term (18 yr) grazing experiment to explore the effects of grazing on the community composition and diversity of the foliar fungal endophytes of two perennial grassland species (i.e., Artemisia capillaris and Stipa bungeana) across one growing season. Grazing significantly increased the mean fungal alpha diversity of A. capillaris in the early season. In contrast, grazing significantly reduced the mean fungal alpha diversity of endophytic fungi of S. bungeana in the late season. Grazing, growing season, and their interactions concurrently structured the community composition of the foliar fungal endophytes of both plant species. However, growing season consistently outperformed grazing and environmental factors in shaping the community composition and diversity of both plant species. Overall, our findings demonstrate that the foliar endophytic fungal community diversity and composition differed in response to grazing between A. capillaris and S. bungeana during one growing season. The focus on this difference will enhance our understanding of grazing's impact on ecological systems and improve land management practices in grazing regions. This variation in the effects of leaf nutrients and plant community characteristics on foliar endophytic fungal community diversity and composition may have a pronounced impact on plant health and plant-fungal interactions.
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Affiliation(s)
- Xin Dong
- State Key Laboratory of Herbage Improvement and Grassland Agro-Ecosystems, Center for Grassland Microbiome, College of Pastoral Agricultural Science and Technology, Lanzhou University, Lanzhou 730000, China; (X.D.); (F.J.); (D.D.); (Z.T.); (H.L.); (Y.Z.); (F.H.); (Z.N.)
| | - Feifei Jiang
- State Key Laboratory of Herbage Improvement and Grassland Agro-Ecosystems, Center for Grassland Microbiome, College of Pastoral Agricultural Science and Technology, Lanzhou University, Lanzhou 730000, China; (X.D.); (F.J.); (D.D.); (Z.T.); (H.L.); (Y.Z.); (F.H.); (Z.N.)
| | - Dongdong Duan
- State Key Laboratory of Herbage Improvement and Grassland Agro-Ecosystems, Center for Grassland Microbiome, College of Pastoral Agricultural Science and Technology, Lanzhou University, Lanzhou 730000, China; (X.D.); (F.J.); (D.D.); (Z.T.); (H.L.); (Y.Z.); (F.H.); (Z.N.)
- Sichuan Zoige Alpine Wetland Ecosystem National Observation and Research Station, Institute of Qinghai-Tibetan Plateau, Southwest Minzu University, Chengdu 610041, China
| | - Zhen Tian
- State Key Laboratory of Herbage Improvement and Grassland Agro-Ecosystems, Center for Grassland Microbiome, College of Pastoral Agricultural Science and Technology, Lanzhou University, Lanzhou 730000, China; (X.D.); (F.J.); (D.D.); (Z.T.); (H.L.); (Y.Z.); (F.H.); (Z.N.)
| | - Huining Liu
- State Key Laboratory of Herbage Improvement and Grassland Agro-Ecosystems, Center for Grassland Microbiome, College of Pastoral Agricultural Science and Technology, Lanzhou University, Lanzhou 730000, China; (X.D.); (F.J.); (D.D.); (Z.T.); (H.L.); (Y.Z.); (F.H.); (Z.N.)
| | - Yinan Zhang
- State Key Laboratory of Herbage Improvement and Grassland Agro-Ecosystems, Center for Grassland Microbiome, College of Pastoral Agricultural Science and Technology, Lanzhou University, Lanzhou 730000, China; (X.D.); (F.J.); (D.D.); (Z.T.); (H.L.); (Y.Z.); (F.H.); (Z.N.)
| | - Fujiang Hou
- State Key Laboratory of Herbage Improvement and Grassland Agro-Ecosystems, Center for Grassland Microbiome, College of Pastoral Agricultural Science and Technology, Lanzhou University, Lanzhou 730000, China; (X.D.); (F.J.); (D.D.); (Z.T.); (H.L.); (Y.Z.); (F.H.); (Z.N.)
| | - Zhibiao Nan
- State Key Laboratory of Herbage Improvement and Grassland Agro-Ecosystems, Center for Grassland Microbiome, College of Pastoral Agricultural Science and Technology, Lanzhou University, Lanzhou 730000, China; (X.D.); (F.J.); (D.D.); (Z.T.); (H.L.); (Y.Z.); (F.H.); (Z.N.)
| | - Tao Chen
- State Key Laboratory of Herbage Improvement and Grassland Agro-Ecosystems, Center for Grassland Microbiome, College of Pastoral Agricultural Science and Technology, Lanzhou University, Lanzhou 730000, China; (X.D.); (F.J.); (D.D.); (Z.T.); (H.L.); (Y.Z.); (F.H.); (Z.N.)
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5
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Zaret MM, Kuhs MA, Anderson JC, Seabloom EW, Borer ET, Kinkel LL. Seasonal shifts from plant diversity to consumer control of grassland productivity. Ecol Lett 2022; 25:1215-1224. [PMID: 35229976 PMCID: PMC9544143 DOI: 10.1111/ele.13993] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2021] [Revised: 01/27/2021] [Accepted: 02/08/2022] [Indexed: 11/29/2022]
Abstract
Plant biodiversity and consumers are important mediators of energy and carbon fluxes in grasslands, but their effects on within‐season variation of plant biomass production are poorly understood. Here we measure variation in control of plant biomass by consumers and plant diversity throughout the growing season and their impact on plant biomass phenology. To do this, we analysed 5 years of biweekly biomass measures (NDVI) in an experiment manipulating plant species richness and three consumer groups (foliar fungi, soil fungi and arthropods). Positive plant diversity effects on biomass were greatest early in the growing season, whereas the foliar fungicide and insecticide treatments increased biomass most late in the season. Additionally, diverse plots and plots containing foliar fungi reached maximum biomass almost a month earlier than monocultures and plots treated with foliar fungicide, demonstrating the dynamic and interactive roles that biodiversity and consumers play in regulating biomass production through the growing season.
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Affiliation(s)
- Max M Zaret
- Department of Ecology, Evolution and Behavior, University of Minnesota, Saint Paul, Minnesota, USA
| | - Molly A Kuhs
- Department of Ecology, Evolution and Behavior, University of Minnesota, Saint Paul, Minnesota, USA
| | - Jonathan C Anderson
- Department of Plant Pathology, University of Minnesota, Saint Paul, Minnesota, USA
| | - Eric W Seabloom
- Department of Ecology, Evolution and Behavior, University of Minnesota, Saint Paul, Minnesota, USA
| | - Elizabeth T Borer
- Department of Ecology, Evolution and Behavior, University of Minnesota, Saint Paul, Minnesota, USA
| | - Linda L Kinkel
- Department of Plant Pathology, University of Minnesota, Saint Paul, Minnesota, USA
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6
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Disease‐mediated nutrient dynamics: Coupling host‐pathogen interactions with ecosystem elements and energy. ECOL MONOGR 2022. [DOI: 10.1002/ecm.1510] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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7
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Kohli M, Henning JA, Borer ET, Kinkel L, Seabloom EW. Foliar fungi and plant diversity drive ecosystem carbon fluxes in experimental prairies. Ecol Lett 2020; 24:487-497. [PMID: 33300281 DOI: 10.1111/ele.13663] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2020] [Accepted: 11/21/2020] [Indexed: 11/29/2022]
Abstract
Plant diversity and plant-consumer/pathogen interactions likely interact to influence ecosystem carbon fluxes but experimental evidence is scarce. We examined how experimental removal of foliar fungi, soil fungi and arthropods from experimental prairies planted with 1, 4 or 16 plant species affected instantaneous rates of carbon uptake (GPP), ecosystem respiration (Re ) and net ecosystem exchange (NEE). Increasing plant diversity increased plant biomass, GPP and Re , but NEE remained unchanged. Removing foliar fungi increased GPP and NEE, with the greatest effects at low plant diversity. After accounting for plant biomass, we found that removing foliar fungi increased mass-specific flux rates in the low-diversity plant communities by altering plant species composition and community-wide foliar nitrogen content. However, this effect disappeared when soil fungi and arthropods were also removed, demonstrating that both plant diversity and interactions among consumer groups determine the ecosystem-scale effects of plant-fungal interactions.
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Affiliation(s)
- Mayank Kohli
- Department of Ecology, Evolution and Behavior, University of Minnesota, Twin Cities, Saint Paul, MI, USA
| | - Jeremiah A Henning
- Department of Ecology, Evolution and Behavior, University of Minnesota, Twin Cities, Saint Paul, MI, USA.,Department of Biology, University of South Alabama, Mobile, AL, USA
| | - Elizabeth T Borer
- Department of Ecology, Evolution and Behavior, University of Minnesota, Twin Cities, Saint Paul, MI, USA
| | - Linda Kinkel
- Department of Plant Pathology, University of Minnesota, Twin Cities, Saint Paul, MI, USA
| | - Eric W Seabloom
- Department of Ecology, Evolution and Behavior, University of Minnesota, Twin Cities, Saint Paul, MI, USA
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8
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Liu X, Lu Y, Zhang Z, Zhou S. Foliar fungal diseases respond differently to nitrogen and phosphorus additions in Tibetan alpine meadows. Ecol Res 2019. [DOI: 10.1111/1440-1703.12064] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Xiang Liu
- State Key Laboratory of Plateau Ecology and Agriculture Qinghai University Xining PR China
- Ministry of Education Key Laboratory of Western China's Environmental Systems Lanzhou University Lanzhou PR China
- Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering School of Life Sciences, Fudan University Shanghai PR China
| | - Yawen Lu
- Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering School of Life Sciences, Fudan University Shanghai PR China
| | - Zhenhua Zhang
- Key Laboratory of Adaptation and Evolution of Plateau Biota Northwest Institute of Plateau Biology, Chinese Academy of Sciences Xining PR China
| | - Shurong Zhou
- State Key Laboratory of Plateau Ecology and Agriculture Qinghai University Xining PR China
- Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering School of Life Sciences, Fudan University Shanghai PR China
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9
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Heckman RW, Halliday FW, Mitchell CE. A growth–defense trade-off is general across native and exotic grasses. Oecologia 2019; 191:609-620. [DOI: 10.1007/s00442-019-04507-9] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2019] [Accepted: 09/06/2019] [Indexed: 11/27/2022]
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10
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Seabloom EW, Condon B, Kinkel L, Komatsu KJ, Lumibao CY, May G, McCulley RL, Borer ET. Effects of nutrient supply, herbivory, and host community on fungal endophyte diversity. Ecology 2019; 100:e02758. [PMID: 31306499 DOI: 10.1002/ecy.2758] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/01/2018] [Revised: 03/21/2019] [Accepted: 04/17/2019] [Indexed: 12/13/2022]
Abstract
The microbes contained within free-living organisms can alter host growth, reproduction, and interactions with the environment. In turn, processes occurring at larger scales determine the local biotic and abiotic environment of each host that may affect the diversity and composition of the microbiome community. Here, we examine variation in the diversity and composition of the foliar fungal microbiome in the grass host, Andropogon gerardii, across four mesic prairies in the central United States. Composition of fungal endophyte communities differed among sites and among individuals within a site, but was not consistently affected by experimental manipulation of nutrient supply to hosts (A. gerardii) or herbivore reduction via fencing. In contrast, mean fungal diversity was similar among sites but was limited by total plant biomass at the plot scale. Our work demonstrates that distributed experiments motivated by ecological theory are a powerful tool to unravel the multiscale processes governing microbial community composition and diversity.
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Affiliation(s)
- Eric W Seabloom
- Department of Ecology, Evolution, and Behavior, University of Minnesota, St. Paul, Minnesota, 55108, USA
| | - Bradford Condon
- Department of Ecology, Evolution, and Behavior, University of Minnesota, St. Paul, Minnesota, 55108, USA
| | - Linda Kinkel
- Department of Plant Pathology, University of Minnesota, St. Paul, Minnesota, 55108, USA
| | - Kimberly J Komatsu
- Smithsonian Environmental Research Center, 647 Contees Wharf Road, Edgewater, Maryland, 21037, USA
| | - Candice Y Lumibao
- Department of Ecology, Evolution, and Behavior, University of Minnesota, St. Paul, Minnesota, 55108, USA
| | - Georgiana May
- Department of Ecology, Evolution, and Behavior, University of Minnesota, St. Paul, Minnesota, 55108, USA
| | - Rebecca L McCulley
- Department of Plant & Soil Sciences, University of Kentucky, Lexington, Kentucky, 40536-0312, USA
| | - Elizabeth T Borer
- Department of Ecology, Evolution, and Behavior, University of Minnesota, St. Paul, Minnesota, 55108, USA
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11
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Kohli M, Borer ET, Kinkel L, Seabloom EW. Stability of grassland production is robust to changes in the consumer food web. Ecol Lett 2019; 22:707-716. [DOI: 10.1111/ele.13232] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2018] [Revised: 11/20/2018] [Accepted: 01/09/2019] [Indexed: 11/28/2022]
Affiliation(s)
- Mayank Kohli
- Department of Ecology, Evolution and Behavior University of Minnesota Twin Cities Minnesota USA
| | - Elizabeth T. Borer
- Department of Ecology, Evolution and Behavior University of Minnesota Twin Cities Minnesota USA
| | - Linda Kinkel
- Department of Plant Pathology University of Minnesota Twin Cities Minnesota USA
| | - Eric W. Seabloom
- Department of Ecology, Evolution and Behavior University of Minnesota Twin Cities Minnesota USA
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