Dominant species responses to drought in seasonal wetlands: evidence from reciprocal transplants across a moisture gradient1

Lovell, John T.; Menges, Eric S.

doi:10.3159/torrey-d-12-00055.1

Cited by 7 publications

(4 citation statements)

References 69 publications

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“…At higher altitudes, wetlands are less dependent on rain, due to increased ice and snowmelt. Additionally, Lovell and Menges () also found soil moisture across a modest elevation gradient to be the primary factor controlling growth patterns of wetland plants.…”

Section: Biotic Characteristics Across Biome Gradients: What Is a Frementioning

confidence: 99%

The freshwater biome gradient framework: predicting macroscale properties based on latitude, altitude, and precipitation

et al. 2019

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Understanding global ecological patterns and processes, from biogeochemical to biogeographical, requires broad‐scale macrosystems context for comparing and contrasting ecosystems. Climate gradients (precipitation and temperature) and other continental‐scale patterns shape freshwater environments due to their influences on terrestrial environments and their direct and indirect effects on the abiotic and biotic characteristics of lakes, streams, and wetlands. We combined literature review, analyses of open access data, and logical argument to assess abiotic and biotic characters of freshwater systems across gradients of latitude and elevation that drive precipitation, temperature, and other variability. We explored the predictive value of analyzing patterns in freshwater ecosystems at the global macrosystems scale. We found many patterns based on climate, particularly those dependent upon hydrologic characteristics and linked to characteristics of terrestrial biomes. For example, continental waters of dry areas will generally be widely dispersed and have higher probability of drying and network disconnection, greater temperatures, greater inorganic turbidity, greater salinity, and lower riparian canopy cover relative to areas with high precipitation. These factors will influence local community composition and ecosystem rates. Enough studies are now available at the continental or global scale to start to characterize patterns under a coherent conceptual framework, though considerable gaps exist in the tropics and less developed regions. We present illustrative global‐scale trends of abiotic, biotic, and anthropogenic impacts in freshwater ecosystems across gradients of precipitation and temperature to further understanding of broad‐scale trends and to aid prediction in the face of global change. We view freshwater systems as occurring across arrays of multiple gradients (including latitude, altitude, and precipitation) rather than areas with specific boundaries. While terrestrial biomes capture some variability along these gradients that influence freshwaters, other features such as, slope, geology, and historical glaciation also influence freshwaters. Our conceptual framework is not so much a single hypothesis as a way to logically characterize patterns in freshwaters at scales relevant to (1) evolutionary processes that give rise to freshwater biodiversity, (2) regulatory units that influence freshwater ecosystems, and (3) the current scope of anthropogenic impacts on freshwaters and the vital ecosystem services they provide.

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Section: Biotic Characteristics Across Biome Gradients: What Is a Frementioning

confidence: 99%

The freshwater biome gradient framework: predicting macroscale properties based on latitude, altitude, and precipitation

et al. 2019

View full text Add to dashboard Cite

show abstract

“…It is possible that during the dry season, abiotic stress would be even more intense and seasonal changes could impact the relative importance of facilitation and competition in wetland plant communities, with facilitation likely more prevalent in the dry season and competition important for structuring wet-season plant communities. Lovell and Menges (2013) found that the availability of soil water and not competitive interactions dictated growth and survival in the dry season in seasonal wetlands. That study also included Panicum hemitomon which exhibited decreased growth rate and increased resprouting, and increased mortality of resprouted ramets in the driest month.…”

Section: F I G U R Ementioning

confidence: 98%

“…Therefore, both species are tolerant of a wide range of hydrological conditions and may not experience intense abiotic stress in these seasonal wetlands, even though they are flooding-tolerant obligate wetland plants. It is important to note that this study was conducted during the wet season in Florida and different dynamics and levels of abiotic stress may occur in the dry season (Lovell & Menges, 2013). It is possible that during the dry season, abiotic stress would be even more intense and seasonal changes could impact the relative importance of facilitation and competition in wetland plant communities, with facilitation likely more prevalent in the dry season and competition important for structuring wet-season plant communities.…”

Section: F I G U R Ementioning

confidence: 99%

Grazing and microhabitat interact to affect plant–plant interactions in subtropical seasonal wetlands

Boughton

Quintana‐Ascencio

Bohlen

2020

J Vegetation Science

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Aims: The stress gradient hypothesis predicts that competition will be important in productive environments while facilitation will be common in environments with high stress or consumer pressure. However, abiotic stress and grazing may vary independently and even occur simultaneously. Here we examine the outcome of plant interactions in grazed wetlands where consumer pressure and abiotic stress occur concurrently. We hypothesized that cattle grazing and microhabitat would alter the outcome of plant interactions. Given that wetland edges are drier and less productive than wetland centers we expected that facilitation would be greatest in drier wetland edges due to greater abiotic stress regardless of cattle presence. Location: Archbold Biological Station's Buck Island Ranch (BIR), south-central Florida, USA (27°09′ N, 81°11′ W). Methods: We conducted an experiment for two growing seasons in ten wetlands, five exposed to cattle grazing and five fenced. Two wetland obligate plants were included (Panicum hemitomon and Alternanthera philoxeroides), and plots were assigned to three treatments (a) all neighbors removed; (b) all neighbors removed except Juncus effusus, a dominant, unpalatable plant; and (c) all neighbors intact (control), in both wetland centers and edges. Differences in survival, change in height and number of leaves were assessed. Results: In ungrazed wetlands, plant survival was higher in wetland edges vs centers, while it did not differ between microhabitats in grazed wetlands. Survival in wetland edges was further increased by the presence of Juncus effusus. Positive interactions under grazed conditions were clear when plant height was assessed, but negative interactions affected leaf production in both ungrazed and grazed wetlands. Conclusions: Grazing interacts with wetland microhabitat to alter plant survival. Facilitative interactions on plant height were apparent in grazed wetlands. Understanding how plant interactions change under different biotic and abiotic contexts is important for informing ecosystem restoration and management.

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“…These ponds vary extensively in the nature of their vegetation, which in turn reflects the depth and topography of the pond and type of soil , Landman and Menges 1999, Lovell and Menges 2013. The hydroperiod (i.e., the period of standing water) of seasonal ponds at ABS is variable depending on pond elevation, basin topography, and rainfall patterns (Menges and Marks 2008).…”

Section: Seasonal Pondsmentioning

confidence: 99%

The Reproduction and Ecology ofHypericum edisonianum: An Endangered Florida Endemic

Abrahamson

Kloet

2014

Castanea

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Dominant species responses to drought in seasonal wetlands: evidence from reciprocal transplants across a moisture gradient1

Cited by 7 publications

References 69 publications

The freshwater biome gradient framework: predicting macroscale properties based on latitude, altitude, and precipitation

The freshwater biome gradient framework: predicting macroscale properties based on latitude, altitude, and precipitation

Grazing and microhabitat interact to affect plant–plant interactions in subtropical seasonal wetlands

The Reproduction and Ecology ofHypericum edisonianum: An Endangered Florida Endemic

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