Browsing Fisheries by Title
Now showing items 225-238 of 238
-
Under what conditions can a novel invader (the marbled crayfish, Procambarus fallax f. virginalis) exert predation pressure on schistosome-competent snails?
The human burden of environmentally transmitted infectious diseases can depend strongly on ecosystem factors, including the presence or absence of natural enemies. Like natural enemies, non-native species influence the ... -
Understanding and predicting the leading edge dynamics of invasive rusty crayfish (Orconectes rusticus) in the John Day River
Continued ecological impacts of invasive species on freshwater ecosystems is one of the main challenges confronting ecologists and decision makers in conserving biodiversity and ecosystem function today. Efforts to prohibit ... -
Understanding the effects of environmental variability on demography in species with complex life histories through integrated population modeling
Understanding the spatio-temporal variability in demography offers insight into factors underlying the dynamics and viability of wildlife populations. However, sparse monitoring data or persistent knowledge gaps can make ... -
Understanding the impacts of anthropogenic stressors on species, ecosystems, and fishing communities
Anthropogenic modifications of marine environments result from a variety of activities and have effects across social and ecological dimensions. Humans inhabit linked systems, where our actions such as resource extraction, ... -
Urban development modifies lake food webs in the Pacific Northwest
Residential shoreline and watershed development by humans are leading drivers of biodiversity loss in lake ecosystems that reduce abundances and diversity littoral invertebrates. Invertebrate biological and life history ... -
Using genetic tools to inform management and study local adaptation in Pacific salmon
Genetic analysis represents a powerful tool for informing management and studying adaptation in wild populations. For example, genetic tools can be used to delineate conservation units, assign individuals of unknown ... -
Utility and implications of no-take marine reserves in fishery management strategies
(2012-09-13)This work explores (1) the potential for using marine reserves to manage data-poor fish populations, (2) the potential for marine reserves to influence the performance of commonly used stock assessment approaches relative ... -
The utility of catch-per-unit-effort when assessing and managing long-lived fish stocks
(2013-07-25)The research in this Ph.D. dissertation focuses on the relationship between fishery-dependent catch-per-unit-effort (CPUE) and abundance and how its use when assessing and managing fisheries may be affected by some of its ... -
Watershed Controls on Biogeochemical Processes in Aquatic Ecosystems
Freshwater ecosystems provide critical services to sustain human livelihoods, such as fisheries, agriculture and clean water, yet face increasing demands from rapidly expanding populations and globalizing societies. In ... -
Watershed Controls on Stream Thermal Regimes: Effects on Salmon Spawn Timing and Species Interactions
Global surface temperatures are warming at unprecedented rates and are expected to continue to warm for the rest of the century. Yet, we know very little about how freshwater ecosystems will respond to a warmer climate. ... -
Watershed controls on streamwater biogeochemistry in a large boreal river network
Streamwater chemistry forms the base of aquatic food webs and reflects both watershed and instream controls, yet the balance of these controls has not been quantified across large river networks. Boreal river networks in ... -
Wildfire effects on stream metabolism: Aquatic succession is mediated by local riparian succession and stream geomorphology
As climate change shifts and intensifies fire regimes, it is important to understand stream ecosystem responses to fire. How stream metabolism responds remains largely unexplored. We investigated effects of fire severity ... -
Withering Syndrome Disease Dynamics in Wild and Cultured Northeastern Pacific Abalones
Withering syndrome (WS) is a chronic bacterial disease of abalones, Haliotis spp., caused by a Rickettsia-like organism (WS-RLO). The etiological agent, Candidatus Xenohaliotis californiensis, occurs along the eastern ... -
Yearling Chinook salmon ecology and behavior during early-ocean migration
(2014-04-30)High mortality rates of Pacific salmon (Oncorhynchus spp.) in the nearshore ocean environment of the Columbia River (Northwest USA) is one of several key factors limiting recovery of these threatened and endangered fish. ...