The Long Term Soil Productivity (LTSP) program was founded to examine the effects of soil disturbance, specifically impacts to soil organic matter and soil compaction, on fundamental forest productivity. Both have significant impacts on forest ecosystem function and are heavily …
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Life history strategies have long been used in ecological analyses and theories but have only recently been applied to frameworks for freshwater mussels, which are a highly imperiled group of organisms. One of the most severe threats for mussels in Texas is dewatering of their h…
The global extent of tropical dry forests has rapidly diminished in recent decades due to a variety of threats, largely from human activity. Efforts to restore these forests require understanding of the various modes of regeneration and how they are impacted across a range of di…
Climate change is expected to drive shifts in forest species distribution to track ideal climatic conditions. The relative capacity for a tree species to persist under climatic stress is dependent on life history traits, such as growth, survival, and reproduction. Trees that pro…
As global change disrupts historical patterns of variation in the abiotic and biotic environment, there is an urgent need to not only investigate the ecological impacts of these complex changes, but how these novel environments will affect the evolutionary trajectory of local po…
Human-caused changes in water use, emissions, and land cover have increasingly impacted the natural and built environments. As a result, the natural hydrologic cycle has been disrupted, causing changes in the quantity and quality of water, extreme events (i.e., droughts and floo…
This floristic inventory is focused on the upper portion of the Sespe Creek watershed in northern Ventura County, California. Sespe Creek is a Wild and Scenic River in the Los Padres National Forest (LPNF). The Sespe Creek has substantial intact riparian habitats and high levels…
Across the Southeastern United States (SEUS) growing populations are increasing demand on water resources and infrastructure. Understanding the long-term natural flow regime of rivers is critical to developing accurate models of water level variability needed for appropriate wat…
Snow water equivalent (SWE) measurements are critical for creating flood and drought outlooks in the spring. These data are abundantly collected throughout the winter and spring months and reported to organizations like the National Weather Service to use in their products. Orga…
As regiões semiáridas são caracterizadas por suas variações climáticas de alternância entre períodos com baixa pluviosidade e períodos com elevada precipitação. Esses locais, quando habitados, tornam-se palcos propícios à ocorrência de desastres. A presente investigação tem como…
Among all ecosystems tropical forests play a disproportionate role in Earth’s carbon cycle as they account for one third of total primary productivity. Global environmental change is causing novel precipitation patterns, shifts in the timing of rainfall events and an increase of…
In this thesis I studied cause and effect of Cyto Nuclear Incompatibility (CNI) induced speciation in plants. By combining comparative genomics, phylogenetics and bioinformatics with large scale crossing experiments I was able to infer part of the genetic machinery underlying CN…
This dissertation explores the hypothesis that land-atmosphere interactions exert a significant control on aridity at the regional scale. Interactions related to topography, drought, and land use are considered, with a geographic focus on the Middle East. In the first study it i…
Droughts are occurring in many regions of the world with increased frequency and severity. Due to the recurrence and persistence of their impacts, the strategy of crisis intervention for mitigation has shown its limits. To deal not only with the immediate effects, but also with …
One of the critical factors behind the dismaying image of misery and conflict in Africa is water shortage, which leads to poor agricultural productivity and consequently famine. Africa might not be the driest continent on earth, because it has a reticulation of 54 drainage basin…
For many years, the Casamance was a self-sufficient region. Recently, this region has experienced food deficits because of the persistent drought. Given the shortage of rainfall over the last several years and the increasing accumulation of salt, the number of abandoned mangrove…
Point based biophysical simulation of forage production coupled with 1-km AVHRR-NDVI data was used to determine the feasibility of projecting forage condition 84 days into the future to support stocking decision making for livestock production using autoregressive integrated mov…
Objectives. (1) Determine the food procurement strategies utilized by the Fulani. (2) Identify the prinicipal and minor edible-wild plants used in the study area, with special attention to groups at risk; also determine dietary taboos associated with the dietary use of wild plan…
Interactions between climate variability, risk behavior and agricultural policies in Morocco are examined. The analysis employs a series of general equilibrium models that are linked together to account for risk. The model explicitly incorporates the main features of the economy…