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Howell A, Winkler DE, Phillips ML, McNellis B, Reed SC. Experimental Warming Changes Phenology and Shortens Growing Season of the Dominant Invasive Plant Bromus tectorum (Cheatgrass). FRONTIERS IN PLANT SCIENCE 2020; 11:570001. [PMID: 33178240 PMCID: PMC7593257 DOI: 10.3389/fpls.2020.570001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/05/2020] [Accepted: 09/16/2020] [Indexed: 05/31/2023]
Abstract
Bromus tectorum (cheatgrass) has successfully invaded and established throughout the western United States. Bromus tectorum grows early in the season and this early growth allows B. tectorum to outcompete native species, which has led to dramatic shifts in ecosystem function and plant community composition after B. tectorum invades. If the phenology of native species is unable to track changing climate as effectively as B. tectorum's phenology then climate change may facilitate further invasion. To better understand how B. tectorum phenology will respond to future climate, we tracked the timing of B. tectorum germination, flowering, and senescence over a decade in three in situ climate manipulation experiments with treatments that increased temperatures (2°C and 4°C above ambient), altered precipitation regimes, or applied a combination of each. Linear mixed-effects models were used to analyze treatment effects on the timing of germination, flowering, senescence, and on the length of the vegetative growing season (time from germination to flowering) in each experiment. Altered precipitation treatments were only applied in early years of the study and neither precipitation treatments nor the treatments' legacies significantly affected B. tectorum phenology. The timing of germination did not significantly vary between any warming treatments and their respective ambient plots. However, plots that were warmed had advances in the timing of B. tectorum flowering and senescence, as well as shorter vegetative growing seasons. The phenological advances caused by warming increased with increasing degrees of experimental warming. The greatest differences between warmed and ambient plots were seen in the length of the vegetative growing season, which was shortened by approximately 12 and 7 days in the +4°C and +2°C warming levels, respectively. The effects of experimental warming were small compared to the effects of interannual climate variation, suggesting that interactive controls and the timing of multiple climatic factors are important in determining B. tectorum phenology. Taken together, these results help elucidate how B. tectorum phenology may respond to future climate, increasing our predictive capacity for estimating when to time B. tectorum control efforts and how to more effectively manage this exotic annual grass.
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Affiliation(s)
- Armin Howell
- U.S. Geological Survey, Southwest Biological Science Center, Moab, UT, United States
| | - Daniel E. Winkler
- U.S. Geological Survey, Southwest Biological Science Center, Moab, UT, United States
| | - Michala L. Phillips
- U.S. Geological Survey, Southwest Biological Science Center, Moab, UT, United States
| | - Brandon McNellis
- Department of Forest, Rangeland and Fire Sciences, University of Idaho, Moscow, ID, United States
| | - Sasha C. Reed
- U.S. Geological Survey, Southwest Biological Science Center, Moab, UT, United States
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Sui L, Zhu H, Xu W, Guo Q, Wang L, Zhang Z, Li Q, Wang D. Elevated air temperature shifts the interactions between plants and endophytic fungal entomopathogens in an agroecosystem. FUNGAL ECOL 2020. [DOI: 10.1016/j.funeco.2020.100940] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
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Liu J, Zhang R, Xu X, Fowler JC, Miller TEX, Dong T. Effect of summer warming on growth, photosynthesis and water status in female and male Populus cathayana: implications for sex-specific drought and heat tolerances. TREE PHYSIOLOGY 2020; 40:1178-1191. [PMID: 32478381 DOI: 10.1093/treephys/tpaa069] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2020] [Accepted: 05/27/2020] [Indexed: 06/11/2023]
Abstract
Effects of climate warming on tree growth and physiology may be driven by direct thermal effects and/or by changes in soil moisture. Dioecious tree species usually show sexual spatial segregation along abiotic gradients; however, few studies have assessed the sex-specific responses to warming in dioecious trees. We investigated the sex-specific responses in growth, photosynthesis, nonstructural carbohydrate (NSC), water-use efficiency and whole-plant hydraulic conductance (KP) of the dioecious tree species Populus cathayana Rehd. under +4 °C elevated temperature with and without supplemental water. For both sexes, high-temperature treatments significantly decreased growth (height and biomass), photosynthetic rate (A), the ratio of A to dark respiration rate, stomatal conductance (gs), transpiration rate, NSC, leaf water potential and KP, but increased water-use efficiency (estimated from carbon isotope composition). Under warming with supplemental water, most traits of females did not change relative to ambient conditions, but traits of males decreased, resulting in greater sexual differences. Females showed a lower KP, and their gs and A responded more steeply with water-related traits than males. These results show that the effect of summer warming on growth and photosynthesis was driven mainly by soil moisture in female P. cathayana, while male performance was mainly related to temperature. Females may experience less thermal stress than males due to flexible water balance strategy via stomata regulation and water use.
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Affiliation(s)
- Junyan Liu
- Key Laboratory of Southwest China Wildlife Resources Conservation (Ministry of Education), China West Normal University, Nanchong, 637009, Sichuan, China
- Key Laboratory of Environmental Science and Biodiversity Conservation (Sichuan Province), and Institute of Plant Adaptation and Utilization in Southwest Mountains, China West Normal University, Nanchong, Sichuan 637009, China
| | - Rong Zhang
- Key Laboratory of Southwest China Wildlife Resources Conservation (Ministry of Education), China West Normal University, Nanchong, 637009, Sichuan, China
- College of Life Sciences, Sichuan University, Chengdu 610064, China
| | - Xiao Xu
- Key Laboratory of Southwest China Wildlife Resources Conservation (Ministry of Education), China West Normal University, Nanchong, 637009, Sichuan, China
| | - Joshua C Fowler
- Department of BioSciences, Program in Ecology and Evolutionary Biology, Rice University, Houston, TX 77005, USA
| | - Tom E X Miller
- Department of BioSciences, Program in Ecology and Evolutionary Biology, Rice University, Houston, TX 77005, USA
| | - Tingfa Dong
- Key Laboratory of Southwest China Wildlife Resources Conservation (Ministry of Education), China West Normal University, Nanchong, 637009, Sichuan, China
- Key Laboratory of Environmental Science and Biodiversity Conservation (Sichuan Province), and Institute of Plant Adaptation and Utilization in Southwest Mountains, China West Normal University, Nanchong, Sichuan 637009, China
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Winkler DE, Belnap J, Duniway MC, Hoover D, Reed SC, Yokum H, Gill R. Seasonal and individual event-responsiveness are key determinants of carbon exchange across plant functional types. Oecologia 2020; 193:811-825. [PMID: 32728948 DOI: 10.1007/s00442-020-04718-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2020] [Accepted: 07/20/2020] [Indexed: 11/29/2022]
Abstract
Differentiation in physiological activity is a critical component of resource partitioning in resource-limited environments. For example, it is crucial to understand how plant physiological performance varies through time for different functional groups to forecast how terrestrial ecosystems will respond to change. Here, we tracked the seasonal progress of 13 plant species representing C3 shrub, perennial C3 and C4 grass, and annual forb functional groups of the Colorado Plateau, USA. We tested for differences in carbon assimilation strategies and how photosynthetic rates related to recent, seasonal, and annual precipitation and temperature variables. Despite seasonal shifts in species presence and activity, we found small differences in seasonally weighted annual photosynthetic rates among groups. However, differences in the timing of maximum assimilation (Anet) were strongly functional group-dependent. C3 shrubs employed a relatively consistent, low carbon capture strategy and maintained activity year-round but switched to a rapid growth strategy in response to recent climate conditions. In contrast, grasses maintained higher carbon capture during spring months when all perennials had maximum photosynthetic rates, but grasses were dormant during months when shrubs remained active. Perennial grass Anet rates were explained in part by precipitation accumulated during the preceding year and average maximum temperatures during the past 48 h, a result opposite to shrubs. These results lend insight into diverse physiological strategies and their connections to climate, and also point to the potential for shrubs to increase in abundance in response to increased climatic variability in drylands, given shrubs' ability to respond rapidly to changing conditions.
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Affiliation(s)
- Daniel E Winkler
- U.S. Geological Survey, Southwest Biological Science Center, Moab, UT, 84532, USA.
| | - Jayne Belnap
- U.S. Geological Survey, Southwest Biological Science Center, Moab, UT, 84532, USA
| | - Michael C Duniway
- U.S. Geological Survey, Southwest Biological Science Center, Moab, UT, 84532, USA
| | - David Hoover
- Rangeland Resources and Systems Research Unit, U.S. Department of Agriculture, Agricultural Research Service, Fort Collins, 80526, USA
| | - Sasha C Reed
- U.S. Geological Survey, Southwest Biological Science Center, Moab, UT, 84532, USA
| | - Hannah Yokum
- Department of Biology, Brigham Young University, Provo, UT, 84604, USA
| | - Richard Gill
- Department of Biology, Brigham Young University, Provo, UT, 84604, USA
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Albright MBN, Mueller RC, Gallegos-Graves LV, Belnap J, Reed SC, Kuske CR. Interactions of Microhabitat and Time Control Grassland Bacterial and Fungal Composition. Front Ecol Evol 2019. [DOI: 10.3389/fevo.2019.00367] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Rodríguez‐Buriticá S, Winkler DE, Webb RH, Venable DL. Local temporal trajectories explain population‐level responses to climate change in saguaro (
Carnegiea gigantea
). Ecosphere 2019. [DOI: 10.1002/ecs2.2844] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Affiliation(s)
- Susana Rodríguez‐Buriticá
- Department of Ecology and Evolutionary Biology University of Arizona Tucson Arizona 85721 USA
- Instituto de Investigación de Recursos Biológicos Alexander von Humboldt Bogotá D.C. Colombia
| | - Daniel E. Winkler
- U.S. Geological Survey Southwest Biological Science Center Moab Utah 84532 USA
| | - Robert H. Webb
- School of Natural Resources University of Arizona Tucson Arizona 85721 USA
| | - D. Lawrence Venable
- Department of Ecology and Evolutionary Biology University of Arizona Tucson Arizona 85721 USA
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