Floods, drought, and seed mass of riparian plant species

Stromberg, Juliet C.; Boudell, Jere A.

doi:10.1016/j.jaridenv.2013.05.012

Cited by 30 publications

(28 citation statements)

References 43 publications

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“…These results should encourage researchers to make further investigations of guild responses to water‐level regulation by including other stressors and other riparian guilds. An inclusion of herbs would increase the resolution since they are more diverse, more sensitive and responsive to flow changes than woody plants (Stromberg & Boudell ; Viers et al., ).…”

Section: Discussionmentioning

confidence: 99%

Riparian plant guilds become simpler and most likely fewer following flow regulation

Bejarano

Nilsson

Aguiar

2017

Journal of Applied Ecology

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Abstract1. River regulation affects riparian systems world-wide and conservation and restoration efforts are essential to retain biodiversity, and the functioning and services of riverine ecosystems. Effects of regulation on plant species richness have been widely addressed, but the filtering effect of regulation on guilds has received less attention.2. We used a functional trait approach to identify adaptive plant strategies through regulation-tolerant traits and predict shifts of riparian vegetation communities in response to regulation. We analysed variation in functional diversity across gradients of hydrological alteration in northern Sweden in relation to modified timing and infrequent major floods, along with frequent short-term inundation.3. Functional richness was similar in all study sites, but species richness declined with increasing intensity of regulation, and the species lost were largely functionally redundant (i.e. co-existing species that have similar contribution to an ecosystem function). Guilds of species intolerant to waterlogging were particularly unsuccessful in most regulated sites as they were affected by hydropower dams which replace major fluvial disturbances with frequent short inundation events. We predict that this guild will disappear, with likely consequences for the entire riverine ecosystem. Synthesis and applications.We conclude that functional traits tolerant to waterlogging or submergence and lack of major fluvial disturbances were key to understanding our results. We suggest that the functional trait approach can be integrated with knowledge of other ecosystem components to provide an understanding of ecosystem function that can be used to guide fluvial ecosystem management. K E Y W O R D Sflow regulation, fluvial ecosystem management, functional diversity, guilds, plant traits, riparian vegetation, riverine ecosystems, rivers, Sweden

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Section: Discussionmentioning

confidence: 99%

Riparian plant guilds become simpler and most likely fewer following flow regulation

Bejarano

Nilsson

Aguiar

2017

Journal of Applied Ecology

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“…The wetland species used in this study are native to the US ( M. guttatus , V. anagallis‐aquatica ), Eurasia ( N. officinale ) or Southern Europe ( P. monspeliensis ), are common in the US and all produce small seeds. As typical small‐seeded species (Stromberg & Boudell ), they do not have the maternal resources necessary to support growth and establishment in resource‐stressed environments (Leishman et al. ; Westoby et al.…”

Section: Discussionmentioning

confidence: 99%

“…). Dryland species typically produce larger seeds (Stromberg & Boudell ), which support seedling establishment in drier conditions (Baker ; Moles & Westoby ; Guerrero‐Campo & Fitter ). Large seed size has been suggested as a mechanism that supports seedling establishment in resource‐stressed environments (Leishman et al.…”

Section: Discussionmentioning

confidence: 99%

“…Wetland species are restricted to sites with high water availability (Penfound ), and dryland species can tolerate soils with varying degrees of soil moisture, in part due to larger seed size (Leishman et al. ; Moles & Westoby ; Stromberg & Boudell ). Wetland and dryland functional groups are strongly correlated with hydro‐gradients in desert riparian ecosystems.…”

Section: Introductionmentioning

confidence: 99%

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Impact of nitrate enrichment on wetland and dryland seed germination and early seedling development

Boudell

Stromberg

2015

J Vegetation Science

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Questions Atmospheric and agricultural inputs of nitrogen have increased significantly. Because riparian zones act as buffers for nutrient transfer and treated municipal effluent and untreated agricultural run‐off are released into streams, and because desert riparian ecosystems contain a wide range of functional groups with respect to water relations, we asked if wetland and dryland species respond differently to increasing levels of soil nitrate. Specifically, we asked if seed germination rate, total percentage germination and seedling development varied by species and functional group in response to increasing nitrate levels. Location Southwestern US. Methods We subjected seeds of common wetland and dryland species to distilled water (control), 0.025 M (low), 0.05 M (intermediate) and 0.075 M (high) KNO3 treatments for 30 days. We determined seed germination rates, total percentage germination and seedling development for each species. Generalized linear mixed models tested for differences between treatments. Results Seeds of wetland species germinated rapidly and in high percentages, and developed into seedlings regardless of nitrate treatments. Dryland species had unique responses to nitrate treatments, with some species exhibiting high germination rates in control treatments and others showing strong germination responses at low to intermediate nitrate levels. A larger number of dryland germinants developed into seedlings under control to low nitrate treatments. Conclusions Riparian plant community dynamics arising from germination responses could change under increased nitrogen inputs, as some species are seemingly unaffected and others significantly impacted. Based on our limited species pool and treatment conditions, the functional group ‘wetland species’ produces a consistent germination and early seedling response regardless of nitrate concentration, while ‘dryland species’ responses are variable and species‐specific. Species known to be nitrophiles can be inhibited by high nitrogen concentration as germinants, highlighting the importance of investigating plant community response to changing conditions at a variety of life stages.

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“…Seed weight positively correlated with precipitation, and temperature (Busso & Perryman, 2005;Moles et al, 2005). Stromberg & Boudell (2013) concluded that small seed weight is independently associated with wet and disturbed conditions in dryland riparian ecosystems.…”

Section: Introductionmentioning

confidence: 99%

Normalized Seed Weight of Three Species of the Genus Peganum L. (Peganaceae Van Tieghem) in Mongolia

2015

Mong. J. Biol. Sci.

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Variation of seed weight of Peganum species is positively correlated with mean seed weight in big populations. It was insignifi cant in small populations, suggesting normalized seed weight is useful to distinguish the population sizes. Normalized seed weight is increased with increasing aridity index and precipitation amount in most sites. Within populations of Peganum harmala, variation of seed weight and normalized seed weight corresponded to Nei's diversity index, while within other species, mean seed weight corresponded to Nei's diversity index. The normalized seed weight was lowest in human-dispersal species, highest in hydro-dispersal species, but it was moderate in wind-human-dispersal species. Low normalized seed weight is associated to species with low genetic diversity, while high normalized seed weight to species with high genetic diversity. Variation of seed weight was related with precipitation and climatic aridity and genetic diversity within species and mean seed weight was with climatic aridity and genetic diversity within species, but normalized seed weight was related with precipitation, climatic aridity and genetic diversity inter-and within species. Narantsetseg, A. 2015. Normalized seed weight of three species of the genus Peganum L. (Peganaceae Van Tieghem) in Mongolia. Mong. J. Biol. Sci., 13(1-2): 43-53.

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Floods, drought, and seed mass of riparian plant species

Cited by 30 publications

References 43 publications

Riparian plant guilds become simpler and most likely fewer following flow regulation

Riparian plant guilds become simpler and most likely fewer following flow regulation

Impact of nitrate enrichment on wetland and dryland seed germination and early seedling development

Normalized Seed Weight of Three Species of the Genus Peganum L. (Peganaceae Van Tieghem) in Mongolia

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