Browsing Quantitative ecology and resource management by Title
Now showing items 30-46 of 46
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Physiological causes and biogeographic consequences of thermal optima in the hypoxia tolerance of marine ectotherms
Recent measurements of critical O2 thresholds (‘Pcrit’) in aquatic animals have revealed thermal optima in their hypoxia tolerance. To discern the prevalence, physiological drivers, and biogeographic manifestations of such ... -
Population Trends of the Eastern North Pacific Blue Whale
(2014-02-24)Blue whales (<italic>Balaenoptera musculus<italic>) were exploited extensively around the world and remain endangered. In the North Pacific their population structure is unclear and current status unknown, with the exception ... -
A Predator Susceptibility Model of Juvenile Salmon Survival and a Voronoi Tessellation-based Approach for Generating Hypothetical Forest Landscapes
(2012-09-13)In relating juvenile salmonid size to adult survival, past observational studies have shown mixed results, while modeling has been limited to regression methods lacking in ecological mechanism. This paper develops a simple ... -
Quantifying sensitivity and exposure to climate change in Western North American species
Significant changes in climate over the coming century will affect different species in different ways. Understanding which species are most vulnerable to climate change is important for guiding conservation efforts and ... -
Release-recapture models for migration juvenile and adult salmon in the Columbia and Snake Rivers using PIT tag and radiotelemetry data
(2005)Release-recapture models for two types of tagging data from migrating salmonids in the Columbia and Snake rivers are presented. The first model uses both juvenile and adult PIT-tag data to analyze the seaward and spawning ... -
Spatial modeling, parameter uncertainty, and precision of density estimates from line-transect surveys: a case study with Western Arctic bowhead whales
Spatially-explicit models of animal density, such as density surface models (DSMs), are diverse, flexible, and powerful tools for investigating spatial patterns in animal density, examining associations between animal ... -
Spatial Models as Powerful Tools for Climate Change Ecology
Many scientists suggest that the Earth has entered a new geologic epoch, the Anthropocene, defined by human influence on nearly every physical and biological system. Climate change is perhaps the most widespread human ... -
Spatio-temporal patterns of forest disturbance in western North America: implications for forest resilience
Globally, forest disturbance activity is changing in response to changing climate. As disturbance regimes change, concerns have been raised that the mechanisms of forest resilience (i.e., the capacity of forests to tolerate ... -
The Age of Infection: A Semi-Markov Framework for Developing Mechanistic Models of Malaria Epidemiology
Malaria is an epidemiologically complex disease which poses a significant burden onhumanity, contributing an estimated 643,000 deaths in 2019 alone [1]. Infection with one cohort of parasites does not prevent concurrent ... -
The Relationship Between Natural Environments and Subjective Well-being as Measured by Sentiment Expressed on Twitter
There is growing evidence that time spent in nature can affect well-being. Nonetheless, assessing this relationship can be difficult. We used social media data—1,971,045 geolocated tweets sent by 81,140 users from locations ... -
The statistical analysis of wildfire growth
Understanding and quantifying wildfire behavior is of interest to the scientific community, as well as public health and fire management professionals. To achieve this end, there is a demand for statistical descriptions ... -
Theoretical Impacts of Habitat Loss and Generalist Predation on Predator-Prey Cycles
Certain herbivores and their predators undergo high amplitude periodic fluctuations in abundance in northern latitudes but exhibit damped cyclic dynamics in their respective southern ranges. Generalist predation and habitat ... -
Understanding the effects of growth and size-at-age variation on the dynamics of fish populations
Understanding drivers of populations is of tantamount importance across a broad scale of researchers, from theoretical ecologists to tactical resource managers. Drivers may be internal feedbacks (density-dependent) or ... -
Understory Light Availability and Spatial Variation
(2013-07-25)Photosynthetically active radiation is a critical resource for understory plants and its availability and heterogeneity plays a major role in seedling regeneration and survival. This thesis examines various methods to ... -
Using Presence-Absence Data on Areal Units to Model the Ranges and Range Shifts of Select South African Bird Species
(2013-11-14)The study of where species occur is an important concern in ecology. Over the last decade, the occupancy model has been the primary tool used in attempts to answer where, when and why species occur where they do. In this ... -
Variability and Asynchrony in Salmon Returns: Implications for Monitoring and Ecosystem Services
Pacific salmon are well-known for their unique life-history characteristics, complex population structures, and the wide range of ecosystem services they provide. Variability in life-history characteristics across and ... -
Wildfire disturbance shapes the physical and biological condition of Pacific Northwest stream ecosystems
Wildfire constitutes one of the most influential processes affecting watershed conditions across the Pacific Northwest. Although the patterns and impacts of wildfire are well-described for terrestrial ecosystems, a ...