A5040824629- Fish Ecology and Management Studies
- Hydrology and Sediment Transport Processes
- Hydrology and Watershed Management Studies
- Wildlife Ecology and Conservation
- Water Quality and Resources Studies
- Species Distribution and Climate Change
- Ecology and Vegetation Dynamics Studies
- Marine and fisheries research
- Simulation Techniques and Applications
- Coral and Marine Ecosystems Studies
- Soil and Water Nutrient Dynamics
- Amphibian and Reptile Biology
- Ecosystem dynamics and resilience
- Evolution and Paleontology Studies
- Survey Sampling and Estimation Techniques
- Morphological variations and asymmetry
- Bat Biology and Ecology Studies
- Marine Bivalve and Aquaculture Studies
- Crustacean biology and ecology
Washington Department of Fish and Wildlife
2022
Biomark (United States)
2020-2021
NOAA National Marine Fisheries Service Northwest Fisheries Science Center
2020
Pacific Biomarkers (United States)
2019
Quantitative BioSciences
2018
University of Washington
2009-2014
Summary Predicting and explaining the distribution density of species is one oldest concerns in ecology. Species distributions can be estimated using geostatistical methods, which estimate a latent spatial variable observed variation densities, but methods may imprecise for with low densities or few observations. Additionally, simple fail to account correlations among generally such cross‐correlations as post hoc exercise. We therefore present factor analysis ( SFA ), model estimating...
The study of population dynamics requires unbiased, precise estimates abundance and vital rates that account for the demographic structure inherent in all wildlife plant populations. Traditionally, these have only been available through approaches rely on intensive mark-recapture data. We extended recently developed N-mixture models to demonstrate how parameters can be estimated structured populations using stage-structured count Our modeling framework used make reliable inferences as well...
Abstract Establishing robust methods and metrics to evaluate habitat quality is critical for the recovery of endangered Pacific salmonids ( Oncorhynchus spp.). A variety modeling approaches are used status trend monitoring anadromous species throughout Northwest, USA, but current may fail capture complex relationship between fish often limited in predictive power beyond specific watersheds. Further, focus on distribution abundance not easily manipulated predict carrying capacity traditional...
Management and conservation of freshwater habitat requires fine spatial resolution watershed-scale life-stage-specific methods due to complex linkages among land, climate, water uses, aquatic organism necessities. In this study, we present a valley-scale microhabitat resolution, process-based bioenergetics approach that combines high-resolution topobathymetric LiDAR survey with two-dimensional hydrodynamic modeling. We applied the model investigate role lateral habitat, stream morphological...
This study examined how a suite of habitat and environmental variables relate to the ability stream surveyor identify (observer efficiency) distinguish accuracy) steelhead (Oncorhynchus mykiss) redds from other features. Two existing spawning survey protocols that included one or two redd observers were used develop models estimate observer error. In most cases, abundances using raw counts underestimated. Mean annual rates efficiency ranged 0.44 0.57, accuracy 0.67 0.83. Regardless error...
Forecasting the risk of population decline is crucial in realm biological conservation and figures prominently viability analyses (PVA). A common form available data for a PVA counts through time. Previous research has suggested that improving estimates trends from count depends on longer observation periods, but often impractical or undesirable. Making multiple observations within single time step an alternative way to gather more without extending period. In this paper, we examine...
Anthropogenic impacts on riverine systems have, in part, led to management concerns regarding the population status of species using these systems. In an effort assess efficacy restoration actions, and order improve monitoring concern, managers have turned PIT (passive integrated transponder) tag studies with in-stream detectors monitor movements tagged individuals throughout river networks. However, quantifying a network data incomplete coverage imperfect detections presents challenge. We...
Abstract The primary conservation prioritization tool for spring Chinook Salmon ( Oncorhynchus tshawytscha ), population viability analysis, is often conducted with biased spawner abundance data no associated statistical uncertainty or error. This study estimated observation error of surveyors counting redds in two populations where hatchery supplementation implemented as a tool. Habitat complexity, redd density and the amount observer experience were important estimating rates. Increases...
Abstract Summer steelhead Oncorhynchus mykiss may enter freshwater almost a year before spawning and potentially make long migrations (>1,000 km) to interior headwater habitats. However, in response suboptimal habitat conditions (e.g., warmer water temperatures), adult summer exhibit complex behaviors during upstream migration the Columbia River basin. Steelhead migrate of their natal tributary (hereafter, referred as “overshoot”) spend days several months subsequently migrating...
Photo 1: Juvenile Chinook salmon, or parr, caught during a fish survey. credit: Richard Carmichael 2: Electrofishing stream in Idaho (Bear Valley Creek) order to estimate parr abundance. surveys were done with either mark–recapture depletion design. Biomark 3: Habitat sampling crews measuring habitat as part of the Columbia Monitoring Program, including topographic survey (top panel) and water quality (bottom panel). Program (CHaMP). 4: Example site high estimated capacity. exhibits...
Abstract Accurate estimates of salmonids passing Lower Granite Dam on the Snake River, by species and origin, are a critical input to assessing status trends various populations as well successful management fisheries in River basin. Here, we describe state-space model that such escapement past dam using window counts, PIT tag observations, data from an adult fish trap, accounting for issues nighttime passage, fallback reascension, potential observation error at window, uncertainty trap...