Abstract A proportion of juvenile Chinook salmon Oncorhynchus tshawytscha and other salmonids travel through one or more turbines during their seaward migration in the Columbia Snake rivers. There is limited information on how these fish respond to hydraulic pressures found turbine passage events. We exposed varied acclimation subsequent exposure mimic large Kaplan turbines. Additionally, we abiotic (total dissolved gas rate pressure change) biotic factors (condition factor, length, weight)...

ABSTRACT The sex‐age‐kill (SAK) model is widely used to estimate abundance of harvested large mammals, including white‐tailed deer ( Odocoileus virginianus ). Despite a long history use, few formal evaluations SAK performance exist. We investigated how violations the stable age distribution and stationary population assumption, changes male or female harvest, stochastic effects (i.e., random fluctuations in recruitment survival), sampling efforts influenced estimation. When simulated had λ...

Abstract This study investigated the mortality of and injury to juvenile Chinook salmon Oncorhynchus tshawytscha exposed simulated pressure changes associated with passage through a large Kaplan hydropower turbine. Mortality varied depending on whether fish was carrying transmitter, method transmitter implantation, depth acclimation, size fish. Juvenile implanted radio transmitters were more likely than those without die or sustain injuries during turbine passage. Gastric implantation...

A tag–release study is illustrated using radio-tagged chinook (Oncorhynchus tshawytscha) smolts to concurrently estimate passage rates and survival probabilities through the spillway turbines of a hydroelectric project. The radio antennas at forebays dam were arranged in double arrays allowing estimation route-specific detection converting smolt detections estimates absolute passage. maximum likelihood model presented downstream histories jointly probabilities. In turn, these combined dam,...

Statistical analyses based on maximum likelihood methods are presented to jointly estimate harvest rates, survival, recruitment, and population abundance from age-at-harvest data. To perform the reconstruction data, auxiliary field data information reporting rates required. The statistical permit tests of model assumptions, goodness-of-fit, standard errors confidence intervals for all estimated demographic parameters. We illustrate using radiotelemetry studies elk (Cervus elaphus) northern...

A field study to estimate the survival of outmigrating steelhead (Oncorhynchus mykiss) smolts using radiotelemetry methods is illustrated. paired release–recapture design was used pool (i.e., reservoir), dam, and project reservoir plus dam) at two mid-Columbia River hydroprojects based on maximum likelihood estimation. The release detection scheme designed minimize possibility detecting false-positive radio signals from that might have died upstream during hydroproject passage. Model...

Abstract: This paper illustrates how age‐at‐harvest data, when combined with hunter‐effort information routinely collected by state game management agencies, can be used to estimate and monitor trends in big abundance. Twenty‐four years of data for black‐tailed deer ( Odocoileus hemionus ) were analyzed produce abundance estimates ranging from 1,281 adult females 3,232 on a 22,079‐ha tree farm Pierce County, Washington, USA. The annual natural survival probability was estimated 0.7293 =...

Acoustic telemetry is one of the primary technologies for studying behavior and survival fishes throughout world. The size performance transmitter are key limiting factors. newly developed injectable first acoustic that can be implanted via injection instead surgery. A two-part field study was conducted to evaluate its effect on fish. performed well similarly proceeding generation commercially-available JSATS transmitters tested concurrently. Snake River subyearling Chinook salmon smolts...

ABSTRACT From 2014 to 2016, GE Renewable Energy and California Ridge Wind tested an ultrasonic bat deterrent system during the autumn migration period at operating wind farm in Illinois, USA. The consisted of air‐jet emitters mounted on nacelles towers a different configuration each year. Each year we conducted randomized block experiment determine whether acoustic reduced mortalities farm. Effectiveness was based estimates 3‐day trials. operation resulted significant overall fatality...

Approximately 16% of the world’s electricity and over 80% renewable is generated from hydropower resources, there potential for developing significantly more new capacity. In practice, however, optimizing use resources limited by various factors, including environmental effects related mitigation requirements. That why regulatory requirements frequently call targets to be met regarding fish injury mortality rates. The sensor (SF) a small autonomous package that can deployed through complex...

Abstract Previous methods of estimating route‐specific passage and survival probabilities for anadromous salmonids past hydroelectric dams have often failed because faulty assumptions. We present a robust, multiple‐release model that combines release–recapture are known to solve parts the overall problem. Release 1 allows estimation proportions relative probabilities. Releases 2 3 provide an estimate absolute through particular route, which gives estimates dam when combined with release 1. 4...

Each year, telemetry tags (acoustic, radio, and passive integrated transponder tags) are surgically implanted into thousands of fish to assess their passage survival through hydropower facilities. One route that is particular concern hydroturbines, where may be exposed a range potential injuries include barotraumas from rapid decompression. The change in pressure acclimation exposure (nadir) has been identified as an important factor predicting the likelihood mortality injury for juvenile...

Many investigations of anthropogenic and natural impacts in ecological systems attempt to detect differences variables or community composition. Frequently, ordination procedures such as principal components analysis (PCA) canonical correspondence (CCA) are used simplify complex data sets into a set primary factors that express the variation across original variables. Scatterplots first second then visually inspect for composition between treatment groups. We present multidimensional...

Little is known about the three-dimensional depth distributions in rivers of individually marked fish that are close proximity to hydropower facilities. Knowledge approaching dams can be used understand how vulnerable injuries such as barotrauma they pass through dams. To predict possibility injury caused by pressure changes during turbine passage, it necessary behaviour relative acclimation dam forebays approach turbines. A guiding study was conducted using high-resolution tracking results...

Abstract High survival through hydropower projects is an essential element in the recovery of Pacific salmon Oncorhynchus spp. populations Columbia River. dam passage also a regulatory requirement under 2008 Biological Opinion (BiOp; established Endangered Species Act) on Federal River Power System operation. The BiOp requires to be at least 0.96 and 0.93 for spring summer out‐migrating juvenile salmonids, respectively, estimated with SE 0.015 or lower. An innovative virtual/paired‐release...

Abstract A cylindrical micro acoustic transmitter (AT; weight in air = 0.2 g) has been developed for injection into the peritoneal cavity of fish. Laboratory studies can provide tagging guidelines to minimize effects implantation techniques and burden (transmitter expressed as a proportion fish weight) before use AT field studies. To establish minimizing effects, we examined response variables (mortality, expulsion, growth, wound healing) AT‐injected juvenile Chinook Salmon Oncorhynchus...

Abstract Traditional single and paired release–recapture models are incapable of providing unbiased estimates dam passage survival because their assumptions can never be met. Nevertheless, regulatory requirements mandate the estimation this important performance measure for migratory fish species passing through hydroprojects. We present a new model that uses virtual release in-river migrants known to have arrived at dam, combined with below estimate survival. Analytical comparisons sampling...