Projected warming disrupts the synchrony of riparian seed release and snowmelt streamflow

Perry, Laura G.; Shafroth, Patrick B.; Hay, Lauren; Markstrom, Steven L.; Bock, Andrew R.

doi:10.1111/nph.16191

Cited by 9 publications

(6 citation statements)

References 115 publications

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“…This gives our results broad applicability to flow management of regulated rivers around the world, especially those experiencing similarly altered seasonal or thermal flow regimes (e.g. Perry et al, 2020;Yang et al, 2012).…”

Section: F I G U R Ementioning

confidence: 82%

“…Altered seasonal flow patterns can be expected to adversely affect plant species with phenologies adapted to natural flow regimes, e.g. species with seed release timing adapted to natural seasonal flow peaks (Kehr et al., 2014; Perry et al., 2020). The effects of water attributes that vary with season, such as temperature and oxygen availability (higher oxygen content in colder water) are less certain (Van Eck et al., 2005).…”

Section: Introductionmentioning

confidence: 99%

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Warmer water temperatures exacerbate the negative impacts of inundation on herbaceous riparian plants

et al. 2022

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1. In temperate climates with cool-season (winter/spring) dominated rainfall, river regulation typically reduces natural flow peaks and increases warm-season flows for irrigation, often to the detriment of stream health. However, the mechanisms driving seasonal effects of elevated river flows on herbaceous plants are not well understood. Our study aimed to improve understanding of the role of water temperature in herbaceous plant responses to season of inundation to inform flow management in temperate regulated rivers.2. In a tank-based experiment in late spring, we tested the effect of inundation durations typical of environmental or managed flow pulses (0-36 days) in both cool (ambient, c. 18°C) and artificially warmed water (c. 23°C) on eight herbaceous plant species selected across a range of expected inundation tolerances, growth forms, and origins (locally exotic or native).3. All species showed negative effects of inundation and greater reductions in survival and/or growth with longer inundation durations, and inundation tolerance varied among species as expected. Plants inundated in warm water died faster and/or at higher proportions than those inundated in cool water, for inundation intolerant to moderately inundation-tolerant species, with no mortality effects in highly inundation-tolerant species. Plant growth was relatively unaffected by temperature, except for minor reductions in growth and biomass, primarily in response to warm compared to cool inundation. 4. Our study clearly demonstrates that extended inundation was detrimental to all species tested and that warmer water exacerbated these negative effects, especially for inundation-intolerant and moderately inundation-tolerant plant species. This suggests that warm-season flows in temperate regulated rivers should be short in duration to reduce the risk of damage to vegetation in riparian zones. 5. Our findings strengthen our mechanistic understanding of herbaceous plant responses to inundation in different seasons, providing further evidence that water temperature is a key factor affecting these responses.

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Section: F I G U R Ementioning

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Warmer water temperatures exacerbate the negative impacts of inundation on herbaceous riparian plants

et al. 2022

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“…In the western US, reductions in large flood frequency by damming are implicated in Tamarix expansion and reduction in native Populus species (Mortenson et al, 2012). In addition, native plant cover in this area has been correlated with permanent stream flow, lower temperatures, and higher precipitation (Gonz alez et al, 2017), strongly contrasting with predicted increased drought frequency, reduced precipitation and increased temperatures (Goeking & Tarboton, 2020;Holden et al, 2018;Perry et al, 2020). Modification to the historic natural flow regime in similar temperate dryland regions (e.g., Mediterranean, Southern Australia, and Western United States) has also been projected to result in simplified plant communities that are less resistant to invasion because native riparian plant guilds are strongly influenced by the historic flow regime, with the most significant component of flow alteration for plant community response being flood reduction accompanied by drought and flow homogenization (Tonkin et al, 2018).…”

Section: Augmented Biological Invasion By Alien Plants In a Changing ...mentioning

confidence: 99%

Interacting effects of climate change and invasions by alien plant species on the morphodynamics of temperate rivers

2023

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This review explores the implications of climate change for the functioning of plant species as biogeomorphic engineers of temperate river systems, including the potential for an increasing role of invasive alien plant species (IAPS). First, we introduce engineer plants as important controls, along with flowing water and transported sediments, on the morphodynamics of river systems and the likelihood that climate change may affect the contributions of species within their native habitats. We then examine through the prism of the fluvial biogeomorphic succession model how climate change may accelerate the establishment of IAPS, the possible consequences for the performance and/or persistence of native engineer plant species, and thus the potential pathways of influence for IAPS on river morphodynamics. Finally, we present examples of the impacts of invasions by specific plant species along particular river systems and consider their potential biogeomorphic impact against a backdrop of climate change. Loss, replacement, or displacement of native plant species in the river corridor by IAPS can potentially alter biogeomorphic phenomena by directly increasing or decreasing erosion and/or sedimentation and the associated development of fluvial landforms. In the shorter term, increased climate disturbance may provide more establishment opportunities for opportunistic IAPS. In the longer term, under heavy establishment, IAPS may alter the coupled assembly of plant communities, fluvial landforms and ecosystem development, potentially resulting in river landscape metamorphosis and significantly changed habitat conditions.This article is categorized under: Science of Water > Water and Environmental Change Water and Life > Nature of Freshwater Ecosystems Water and Life > Stresses and Pressures on Ecosystems Water and Life > Conservation, Management, and Awareness

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“…Thus, these mismatches may interfere with key processes of vegetation development, such as dispersal, germination, growth and survival, and reproduction. Abiotic shifts may for example concern resource availability (Perry et al, 2020) or hydrological processes (Stella et al, 2006;Balke and Nilsson, 2019). Because different species are affected in different ways, riparian vegetation composition is likely to change in the future.…”

Section: The Climate Crisismentioning

confidence: 99%

“…Because different species are affected in different ways, riparian vegetation composition is likely to change in the future. Although changes can be predicted for some species (e.g., Balke and Nilsson, 2019;Perry et al, 2020), the effects of extreme events, interactions between species, large local variation and interactions with other pressures make it difficult to predict what future riparian zones will look like, but decreased taxonomic and functional diversity are to be expected (Nilsson et al, 2013;Baattrup-Pedersen et al, 2018).…”

Section: The Climate Crisismentioning

confidence: 99%

Pressures on Boreal Riparian Vegetation: A Literature Review

2022

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Riparian zones are species-rich and functionally important ecotones that sustain physical, chemical and ecological balance of ecosystems. While scientific, governmental and public attention for riparian zones has increased over the past decades, knowledge on the effects of the majority of anthropogenic disturbances is still lacking. Given the increasing expansion and intensity of these disturbances, the need to understand simultaneously occurring pressures grows. We have conducted a literature review on the potential effects of anthropogenic pressures on boreal riparian zones and the main processes that shape their vegetation composition. We visualised the observed and potential consequences of flow regulation for hydropower generation, flow regulation through channelisation, the climate crisis, forestry, land use change and non-native species in a conceptual model. The model shows how these pressures change different aspects of the flow regime and plant habitats, and we describe how these changes affect the extent of the riparian zone and dispersal, germination, growth and competition of plants. Main consequences of the pressures we studied are the decrease of the extent of the riparian zone and a poorer state of the area that remains. This already results in a loss of riparian plant species and riparian functionality, and thus also threatens aquatic systems and the organisms that depend on them. We also found that the impact of a pressure does not linearly reflect its degree of ubiquity and the scale on which it operates. Hydropower and the climate crisis stand out as major threats to boreal riparian zones and will continue to be so if no appropriate measures are taken. Other pressures, such as forestry and different types of land uses, can have severe effects but have more local and regional consequences. Many pressures, such as non-native species and the climate crisis, interact with each other and can limit or, more often, amplify each other’s effects. However, we found that there are very few studies that describe the effects of simultaneously occurring and, thus, potentially interacting pressures. While our model shows where they may interact, the extent of the interactions thus remains largely unknown.

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Projected warming disrupts the synchrony of riparian seed release and snowmelt streamflow

Abstract: This is the author manuscript accepted for publication and has undergone full peer review but has not been through the copyediting, typesetting, pagination and proofreading process, which may lead to differences between this version and the Version of Record. Please cite this article as

Cited by 9 publications

References 115 publications

Warmer water temperatures exacerbate the negative impacts of inundation on herbaceous riparian plants

Warmer water temperatures exacerbate the negative impacts of inundation on herbaceous riparian plants

Interacting effects of climate change and invasions by alien plant species on the morphodynamics of temperate rivers

Pressures on Boreal Riparian Vegetation: A Literature Review

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