A5063320288- Coastal wetland ecosystem dynamics
- Climate change and permafrost
- Cryospheric studies and observations
- Ecology and Vegetation Dynamics Studies
- Plant Water Relations and Carbon Dynamics
- Peatlands and Wetlands Ecology
- Geology and Paleoclimatology Research
- Plant and animal studies
- Fern and Epiphyte Biology
- Species Distribution and Climate Change
- Isotope Analysis in Ecology
- Arctic and Antarctic ice dynamics
- Plant responses to water stress
- Climate variability and models
- Leaf Properties and Growth Measurement
- Aeolian processes and effects
- Remote Sensing in Agriculture
- Methane Hydrates and Related Phenomena
- Tropical and Extratropical Cyclones Research
- Forest ecology and management
- Coastal and Marine Management
- Smart Materials for Construction
- Geological Studies and Exploration
- Climate Change, Adaptation, Migration
- Offshore Engineering and Technologies
Florida International University
2013-2024
Fairchild Tropical Botanic Garden
2007-2015
Summary Field studies to evaluate the roles of environmental variation and random dispersal in explaining floristic composition rain forest plants at landscape regional scales have yet reach a consensus. Moreover, only one study has focused on below 10 km 2 , where effects limitation are expected be easiest observe. In present study, we estimate importance differences some key variables (describing canopy openness, soils topography) relative geographical distances between sample plots as...
Much of the 191.8 Pg C in upper 1 m Arctic soil organic mater is, or is at risk of, being released to atmosphere as CO 2 and/or CH 4 . Global warming will further alter rate emission these gases atmosphere. Here we quantify effect major environmental variables affected by global climate change on fluxes Alaskan Arctic. Soil temperature best predicts and explained 89% variability emissions. Water table depth has a nonlinear impact efflux. Increasing water height above surface retards...
Abstract Populations occurring at species' range edges can be locally adapted to unique environmental conditions. From a perspective, range‐edge environments generally have higher severity and frequency of extreme climatic events relative the core. Under future climates, are predicted become increasingly important in defining distributions. Therefore, genotypes that better climates core populations may essential persistence during periods rapid climate change. We use relatively simple...
Abstract Leaf Area Index (leaf area per unit ground area, LAI) is a key driver of forest productivity but has never previously been measured directly at the landscape scale in tropical rain (TRF). We used modular tower and stratified random sampling to harvest all foliage from floor canopy top 55 vertical transects (4.6 m 2 ) across 500 ha old growth Costa Rica. Landscape LAI was 6.00 ± 0.32 SEM. Trees, palms lianas accounted for 89% total, trees were 95% upper canopy. All organized into...
Tundra ecosystems are especially sensitive to climate change, which is particularly rapid in high northern latitudes resulting significant alterations temperature and soil moisture. Numerous studies have demonstrated that drying increases the respiration loss from wet Arctic tundra. And, warming of tundra soils assumed increase CO 2 emissions Arctic. However, this water table manipulation experiment (i.e., flooding experiment), we show can also lead increased loss. Standing heat conduction...
The Arctic stores close to 14% of the global soil carbon, most which is in a poorly decomposed state as result water‐saturated soils and low temperatures. Climate change expected increase temperature, affecting moisture carbon storage sink potential many ecosystems. Additionally, increased temperatures can thermokarst erosion flooding some areas. Our goal was determine effects that water table shifts would have on CO 2 Alaskan Coastal Plain tundra. To evaluate different regimes, we used...
Climate change has altered global precipitation patterns and led to greater variation in hydrological conditions. Wetlands are important globally for their soil carbon storage. Given that wetland processes primarily driven by hydrology, a comprehensive understanding of the effect inundation is needed. In this study, we evaluated water level (WL) duration (ID) on dioxide (CO2 ) fluxes analysing 10-year (2008-2017) eddy covariance dataset from seasonally inundated freshwater marl prairie...
This research examines the relationships between El Niño Southern Oscillation (ENSO), water level, precipitation patterns and carbon dioxide (CO2) exchange rates in freshwater wetland ecosystems of Florida Everglades. Data was obtained over a 5-year study period (2009–2013) from two marsh sites located Everglades National Park that differ hydrology. At short-hydroperiod site (Taylor Slough; TS) long-hydroperiod (Shark River SRS) fluctuations occurred with changes ENSO phase, suggesting...
Abstract Questions: To what extent are the distributions of tropical rain forest tree ferns ( Cyatheaceae ) related to environmental variation, and is habitat specialization likely play a role in their local coexistence? Location: Lowland at La Selva Biological Station, Costa Rica. Methods: Generalized linear (GLM) generalized additive (GAM) logistic regression were used model incidence four fern species relation neighbourhood variables 1154 inventory plots regularly distributed across 6 km...
Arctic regions hold considerable reservoirs of soil organic carbon. However, most this carbon is in a potential labile state, and expected changes temperature water availability could strongly affect the balance tundra ecosystems. Plant community composition are closely tied to microtopography position relative table. We evaluated CO2 fluxes moss contribution ecosystem photosynthesis response fine-scale topography across drained lake bed Barrow, Alaska, during two contrasting growing...
We analyzed energy partitioning in short- and long-hydroperiod freshwater marsh ecosystems the Florida Everglades by examining balance components (eddy covariance derived latent (LE) sensible heat (H) flux). The study period included several wet dry seasons variable water levels, allowing us to gain better mechanistic information about control of changes hydroperiods. annual length inundation is ~5 months at short-hydroperiod site (25°26′16.5″N, 80°35′40.68″W), whereas (25°33′6.72″N,...
Summary Tropical rain forest tree species are commonly perceived to have more generalized habitat distributions than understorey species. However, the correspondence between floristic patterns in large trees and smaller plants relation environmental differences has rarely been investigated. Comparative analyses complicated by fact that data often much noisy, with higher overall richness poorer spatial temporal representation of composition within sampling plots. Using on pteridophytes...
Shaped by the hydrology of Kissimmee‐Okeechobee‐Everglades watershed, Florida Everglades is composed a conglomerate wetland ecosystems that have varying capacities to sequester and store carbon. Hydrology, which product region's precipitation temperature patterns combined with water management policy, drives community composition productivity. As shifts in both air are expected over next 100 years as consequence climate change, CO 2 dynamics greater change. To reduce uncertainties associated...
Abstract How aquatic primary productivity influences the carbon (C) sequestering capacity of wetlands is uncertain. We evaluated magnitude and variability in C dynamics compared them to net ecosystem CO 2 exchange (NEE) respiration ( R eco ) rates within calcareous freshwater Everglades National Park. continuously recorded 30-min measurements dissolved oxygen (DO), water level, temperature T ), photosynthetically active radiation (PAR). These were coupled with fluxes over 5 years (2012–2016)...
The cold season in the Arctic extends over 8 to 9 mo, yet little is known about vascular plant physiology during this period. Evergreen species photosynthesize under snow, implying that they are exchanging water with atmosphere. However, liquid available for uptake may be limited at time. study objective was determine whether evergreen plants actively taking up while snow and/or immediately following snowmelt spring thaw.In two situ experiments, one plot level and another individual level,...
Premise The southern Florida Everglades landscape sustains wetlands of national and international importance. Sawgrass ( Cladium jamaicense ), the dominant macrophyte in Everglades, has two phenotypes that vary size density between marl prairies peat marshes. Marl have recently been hypothesized to be a newly formed habitat developed after European colonization as result landscape‐scale hydrologic modifications, implying sawgrass response habitat. We examined whether wetland are plastic...