Soil Accretion Influenced by Elevation, Tree Density, and Substrate on Reconstructed Tree Islands

Rodrı́guez, A.; Serna, Alexandra; Scinto, Leonard J.

doi:10.2136/sssaj2014.05.0195

Cited by 9 publications

(8 citation statements)

References 40 publications

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“…Tree islands are nutrient hotpots, having 6-100 times more phosphorus than the surrounding P-limited marshes and sloughs (Noe, Childers, & Jones, 2001;Wetzel et al, 2005). Evidence suggests there is a persistent groundwater head gradient toward the tree islands from the surrounding marsh because of specific yield differences and evapotranspiration gradients between the two habitats (Rodriguez, Serna, & Scinto, 2014;Ross et al, 2006). Localized nutrient enrichment on tree islands is also plausibly attributable to animal movement, particularly nesting by wading birds (Givnish et al, 2008;Wetzel et al, 2005).…”

Section: Box 1 Tree Islands In the Everglades Flmentioning

confidence: 99%

A little relief: Ecological functions and autogenesis of wetland microtopography

et al. 2020

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Microtopography, or the small‐scale variation in ground surface height (10−1–100 m) over short (100–102 m) spatial scales, is a ubiquitous feature of wetlands globally. This variation in elevation, characterized by local high (“hummocks”) and low (“hollows”) patches, is more structured than what is observed in uplands, and is intertwined with concordantly structured spatiotemporal variability in hydrologic regimes and associated ecological processes. The importance of microtopography in wetlands is manifold, with critical influence on local hydrological, biogeochemical, and biological processes. Further, the creation and maintenance of wetland microtopography is a balance between activation processes (i.e., those that induce random elevation variation) and autogenic reinforcement processes (i.e., those that provide the feedbacks necessary for the persistence of microtopography). While there are many mechanisms that create vertical structure (e.g., tree falls, accumulation of roots and soil organic matter, and sediment deposition), they all yield a similar core feedback to enhance and sustain microtopographic structure. Finally, microtopography contributes to spatial patterning that confers emergent ecosystem‐scale functions such as hydrologic storage and flows, carbon cycling, organism dispersal, and biodiversity. There is an ongoing need to study the origins and implications of this fine‐scale variation in elevation, as well as the utility of including microtopography in model predictions and ecological restoration efforts. This article is categorized under: Water and Life > Conservation, Management, and Awareness

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Section: Box 1 Tree Islands In the Everglades Flmentioning

confidence: 99%

A little relief: Ecological functions and autogenesis of wetland microtopography

et al. 2020

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“…The species is found in fresh and brackish water, but sporadic high salinity events could induce salt stress in this plant and affect its growth and establishment. Sporadic salinity can occur due to elevation difference from natural saline systems such as the ocean, and such prolonged flooding can have a direct influence on plant survival [15]. Various studies have shown that V. americana can tolerate 5.0 to 15.0 parts per thousand (ppt) salinity [8].…”

Section: Introductionmentioning

confidence: 99%

Ecotypes of Aquatic Plant Vallisneria americana Tolerate Different Salinity Concentrations

et al. 2020

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Increased salinity caused by saltwater intrusion or runoff from de-icing salts can severely affect freshwater vegetation and deteriorate aquatic ecosystems. These habitats can be restored with freshwater ecotypes (locally adapted populations) that tolerate above-normal salinity. Vallisneria americana is a prominent species in many freshwater ecosystems that responds differently to abiotic conditions such as substrate composition and fertility, so, in this study, we evaluated the effects of salt stress on 24 ecotypes of V. americana. Instant Ocean aquarium salt was used to create saline solutions (0.2 to 20.0 parts per thousand (ppt)), then plants were abruptly exposed to these solutions and maintained in these concentrations for five weeks before being visually assessed for quality and destructively harvested. Analysis of variance and nonlinear regression were used to calculate LC50 values—the lethal concentration of salt that reduced plant biomass and quality by 50% compared to control treatment. Growth rate and visual quality varied significantly among ecotypes, and ecotypes that were most and least sensitive to salt had 50% biomass reductions at 0.47 and 9.10 ppt, respectively. All ecotypes survived 10.0 ppt salinity concentration but none survived at 20.0 ppt, which suggests that the maximum salinity concentration tolerated by these ecotypes is between 15.0 and 20.0 ppt.

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“…The species is found in fresh and brackish water, but sporadic high salinity events could induce salt stress in this plant and affect its growth and establishment. Sporadic salinity can occur due to elevation difference from natural saline systems such as the ocean, and such prolonged flooding can have a direct influence on plant survival [11]. Various studies have shown that V. americana can tolerate 5.0 to 15.0 parts per thousand (ppt) salinity [8].…”

Section: Introductionmentioning

confidence: 99%

Ecotypes of Aquatic Plant <em>Vallisneria americana</em> Tolerate Different Salinity Concentrations

Tootoonchi¹,

Gettys²,

Thayer³

et al. 2020

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Increased salinity caused by saltwater intrusion or runoff from de-icing salts can severely affect freshwater vegetation and deteriorate aquatic ecosystems. These habitats can be restored with freshwater ecotypes (locally adapted populations) that tolerate above-normal salinity. Vallisneria americana is a prominent species in many freshwater ecosystems that responds differently to abiotic conditions such as substrate composition and fertility, so in this study we evaluated the effects of salt stress on 24 ecotypes of V. americana. Instant Ocean aquarium salt was used to create saline solutions [0.2 to 20.0 parts per thousand (ppt)], then plants were abruptly exposed to these solutions and maintained in these concentrations for 5 weeks before being visually assessed for quality and destructively harvested. Analysis of variance and non-linear regression were used to calculate LC50 values – the lethal concentration of salt that reduced plant biomass and quality by 50% compared to control treatment. Growth rate and visual quality varied significantly among ecotypes, and ecotypes that were most and least sensitive to salt had 50% biomass reductions at 0.47 and 9.10 ppt, respectively. All ecotypes survived 10.0 ppt salinity concentration but none survived at 20.0 ppt, which suggests the maximum salinity concentration tolerated by these ecotypes is between 15.0 and 20.0 ppt.

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Soil Accretion Influenced by Elevation, Tree Density, and Substrate on Reconstructed Tree Islands

Cited by 9 publications

References 40 publications

A little relief: Ecological functions and autogenesis of wetland microtopography

A little relief: Ecological functions and autogenesis of wetland microtopography

Ecotypes of Aquatic Plant Vallisneria americana Tolerate Different Salinity Concentrations

Ecotypes of Aquatic Plant <em>Vallisneria americana</em> Tolerate Different Salinity Concentrations

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