25 Result(s)
within
James B. Grace
Life Sciences
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Article
Integrating Remote Sensing with Ground-based Observations to Quantify the Effects of an Extreme Freeze Event on Black Mangroves (Avicennia germinans) at the Landscape Scale
Climate change is altering the frequency and intensity of extreme weather events. Quantifying ecosystem responses to extreme events at the landscape scale is critical for understanding and responding to climat...
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Surface Elevation Change Dynamics in Coastal Marshes Along the Northwestern Gulf of Mexico: Anticipating Effects of Rising Sea-Level and Intensifying Hurricanes
Accelerated sea-level rise and intensifying hurricanes highlight the need to better understand surface elevation change in coastal wetlands. We used the surface elevation table-marker horizon approach to measu...
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A decade of insights into grassland ecosystem responses to global environmental change
Earth's biodiversity and carbon uptake by plants, or primary productivity, are intricately interlinked, underlie many essential ecosystem processes, and depend on the interplay among environmental factors, man...
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Ecology: Signals of impending change
An analysis of arid lands around the world shows how patterns in vegetation may serve as harbingers of things to come.
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Resilience to Stress and Disturbance, and Resistance to Bromus tectorum L. Invasion in Cold Desert Shrublands of Western North America
Alien grass invasions in arid and semi-arid ecosystems are resulting in grass–fire cycles and ecosystem-level transformations that severely diminish ecosystem services. Our capacity to address the rapid and co...
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Ecology in the Real World: How Might We Progress?
In this chapter, the authors consider how the various chapters in the book collectively contribute to ecological studies in the real world of large-scale, long-term phenomena. A framework is presented to descr...
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Structural Equation Modeling and Ecological Experiments
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Article
Representing general theoretical concepts in structural equation models: the role of composite variables
Structural equation modeling (SEM) holds the promise of providing natural scientists the capacity to evaluate complex multivariate hypotheses about ecological systems. Building on its predecessors, path analys...
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Prescribed fire and cutting as tools for reducing woody plant succession in a created salt marsh
This paper reports on efforts to reduce woody successional growth by the native shrub Iva frutescens L. in a created salt marsh by using prescribed fire and cutting. Experimental treatments included a winter burn...
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Large-scale causes of variation in the serpentine vegetation of California
Serpentine vegetation in California ranges from forest to shrubland and grassland, harbors many rare and endemic species, and is only moderately altered by invasive exotic species at the present time. To bette...
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Article
Habitat associations of chorusing anurans in the Lower Mississippi River Alluvial Valley
Amphibian populations have declined worldwide. To pursue conservation efforts adequately, land managers need more information concerning amphibian habitat requirements. To address this need, we examined relati...
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Evaluation of non-destructive methods for estimating biomass in marshes of the upper Texas, USA coast
The estimation of aboveground biomass is important in the management of natural resources. Direct measurements by clip**, drying, and weighing of herbaceous vegetation are time-consuming and costly. Therefor...
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Difficulties with estimating and interpreting species pools and the implications for understanding patterns of diversity
Evidence has been accumulating that species pools play a major role in regulating variations in small-scale diversity. However, our ability to unambiguously estimate and interpret species pools remains a major...
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The effects of soil flooding on the establishment of cogongrass (Imperata cylindrica), a nonindigenous invader of the Southeastern United States
Cogongrass (Imperata cylindrica), an invasive perennial introduced from Southeast Asia, is currently spreading throughout the southeastern United States from Florida to Louisiana. In the U.S., cogongrass is gener...
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Vegetation associations in a rare community type – coastal tallgrass prairie
The coastal prairie ecoregion is located along the northwestern coastal plain of the Gulf of Mexico in North America. Because of agricultural and urban development, less than 1% of the original 3.4 million ha ...
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Effects of flooding, salinity and herbivory on coastal plant communities, Louisiana, United States
Flooding and salinity stress are predicted to increase in coastal Louisiana as relative sea level rise (RSLR) continues in the Gulf of Mexico region. Although wetland plant species are adapted to these stress...
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The interactive effects of fire and herbivory on a coastal marsh in Louisiana
Both vertebrate herbivores and fire have long been known to have dramatic and important effects on wetland vegetation. However, the interactive effects of burning and herbivory have received less attention. In...
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The influence of vines on an oligohaline marsh community: results of a removal and fertilization study
The effects of competitive suppression by vines on the non-vine plant community have received little attention in temperate habitats. This study investigated the impact vines have on their herbaceous hosts in...
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The effects of vertebrate herbivory on plant community structure in the coastal marshes of the Pearl River, Louisiana, USA
In this study, we investigated the impacts of herbivory by the introduced aquatic herbivore, nutria (Myocastor coypus), on three marsh communities of the Pearl River using fenced exclosures and control plots. Alt...
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The interactive effects of herbivory and fire on an oligohaline marsh, Little Lake, Louisiana, USA
Herbivory and fire have been shown to affect the structure and composition of marsh communities. Because fire may alter plant species composition and cover, and these alterations may have an effect on herbivor...
