▪ Abstract Mutualisms occur when interactions between species produce reciprocal benefits. However, the outcome of these frequently shifts from positive, to neutral, negative, depending on environmental and community context, indirect effects commonly unexpected mutualisms that have community-wide consequences. The dynamic, context dependent, nature can transform consumers, competitors, parasites into mutualists, even while they consume, compete with, or parasitize their partner species....

The relationships among behavior, environment, and migration success in anadromous fishes are poorly understood. We monitored behavior at eight Columbia Snake river dams for 18 286 adult Chinook salmon (Oncorhynchus tshawytscha) steelhead (sea-run Oncorhynchus mykiss) over 7 years using radiotelemetry. When statistically controlling variation flow, temperature, fisheries take, other environmental variables, we observed that unsuccessful individuals — those not to reach spawning areas had...

We radio-tagged 577 adult sockeye salmon (Oncorhynchus nerka) returning to the Columbia River in 1997 determine how migration behaviors were related success an altered river system. The probability of successful declined dramatically for late-entry individuals, concomitant with declines discharge and onset stressful temperatures. Long dam passage times not unsuccessful at most dams. However, when histories analyzed across multiple dams or reservoirs, relatively slow was significantly...

Keefer ML, Taylor GA, Garletts DF, Gauthier Pierce TM, Caudill CC. Prespawn mortality in adult spring Chinook salmon outplanted above barrier dams. Ecology of Freshwater Fish 2010: 19: 361–372. © 2010 John Wiley & Sons A/S Abstract – Dams without fish passage facilities block access to much the historic spawning habitat ( Oncorhynchus tshawytscha ) Oregon’s Willamette River basin. Adult are routinely dams supplement natural production, but many die before despite extensive suitable...

Rising river temperatures in western North America have increased the energetic costs of migration and risk premature mortality many Pacific salmon (Oncorhynchus spp.) populations. Predicting managing risks for these populations requires data on acute cumulative thermal exposure, spatio-temporal distribution adverse conditions, potentially mitigating effects cool-water refuges. In this study, we paired radiotelemetry with archival temperature loggers to construct continuous,...

In this paper, we provide an overview of positioning systems for moving resources in forest and fire management review the related literature. Emphasis is placed on accuracy range different localization location-sharing methods, particularly forested environments absence conventional cellular or internet connectivity. We then conduct a second literature concepts to several emerging, broad themes data science, including terms location-based services (LBS), geofences, wearable technology,...

High rates of prespawn mortality, when adult salmon die after completing migration but prior to spawning, can lead population declines and impede recovery threatened stocks. In this study, annual mortality female Chinook Salmon Oncorhynchus tshawytscha ranged from 1% 100% over 14 years in seven study reaches located throughout the upper Willamette River basin, Oregon. Prespawn were positively correlated with maximum 7-d average stream temperature percentage spawning fish hatchery origin....

Abstract Adult Pacific salmon Oncorhynchus spp. may reach spawning grounds but perish before reproducing, a phenomenon known as “prespawn mortality” (PSM). This review synthesizes information on PSM rates and estimation methods to evaluate patterns facilitate study design development. Questionnaire responses from 60 fisheries professionals indicated that female was routinely monitored in numerous populations, variations data collection reporting could lead systematic biases estimates....

Abstract Aquatic ectotherms are predicted to harbour genomic signals of local adaptation resulting from selective pressures driven by the strong influence climate conditions on body temperature. We investigated in redband trout ( Oncorhynchus mykiss gairdneri ) using genome scans for 547 samples 11 populations across a wide range habitats and thermal gradients interior Columbia River. estimated allele frequencies millions single nucleotide polymorphism loci (SNPs) low‐coverage whole...

Thermal refuges in streams are essential for the survival of coldwater fish species such as Redband trout (Oncorhynchus mykiss) landscapes with stressful or lethal stream temperatures. We utilized an uncrewed aerial system (UAS) mounted thermal and natural color sensors to conduct hourly flights over a 24 h period desert Little Jacks Creek during late summer when temperatures were near seasonal maximums streamflow was minimums. used fine-resolution imagery map characterize how our sensor...

ABSTRACT Objective Our overarching objective was to better understand how river environment affects the migration phenology and behavior of adult Chinook Salmon Oncorhynchus tshawytscha in a watershed (Oregon’s Willamette River basin) where climate warming other habitat impacts threaten spring-run population. Methods We analyzed annual spring runs using 23-year time series daily counts at Falls (river kilometer 42, measuring from River–Columbia confluence) relation discharge temperature data...

Two non‐direct homing behaviours, overshoot of natal tributaries and temporary non‐natal tributary use, were evaluated for 5150 radio‐tagged spring–summer Chinook salmon Oncorhynchus tshawytscha from 40 populations in the large Columbia River system. Over 7 years, 2–44% (mean = 15%) individuals within each group temporarily entered presumed tributaries. In addition, many lower river initially travelled 3 to >250 km upstream main‐stem beyond confluences with before returning sites...

Abstract In an effort to improve run timing forecasts for Columbia River spring Chinook salmon Oncorhynchus tshawytscha , we examined relationships among regional ocean climate indices, in‐river environmental conditions, and full stock‐specific migration metrics. Results consistently indicated that adult arrived earliest in years with low river discharge or warm water temperatures latest of cold high flows. As single predictors, conditions generally explained more interannual variability...

Mitigation and ecosystem‐restoration efforts may have unintended consequences on both target nontarget populations. Important effects can be displaced in space time, making them difficult to detect without monitoring at appropriate scales. Here, we examined the of a mitigation program for juvenile salmonids subsequent adult migration behaviors survival. Juvenile chinook salmon ( Oncorhynchus tshawytscha ) steelhead O. mykiss were collected uniquely tagged with passive integrated transponder...

Abstract Elucidation of genetic mechanisms underpinning migratory behavior could help predict how changes in diversity may affect future spatiotemporal distribution a species. This ability would benefit conservation one such declining species, anadromous Pacific lamprey ( Entosphenus tridentatus ). Nonphilopatric migration adult has homogenized population‐level neutral variation but maintained adaptive that differentiates groups based on geography, run‐timing and body form. To investigate...

Fishways designed for salmonids often restrict passage by non-salmonids, and effective tools are needed both to identify problems nontarget species inform remediation planning. In this case study, we used migration histories from 2170 radio-tagged adult Pacific lamprey (Entosphenus tridentatus) locations of poor (bottlenecks) at a large, multifishway dam. Over 10 years, 49% tagged that entered fishways failed pass the Models accounting repeated attempts individual indicated successful...

High rates of dispersal can breakdown coadapted gene complexes. However, concentrated genomic architecture (i.e., islands divergence) suppress recombination to allow evolution local adaptations despite high flow. Pacific lamprey (Entosphenus tridentatus) is a highly dispersive anadromous fish. Observed trait diversity and evidence for genetic basis traits suggests it may be locally adapted. We addressed whether could influence adaptation lamprey. Using two new whole genome assemblies...

Although the random forest algorithm has been widely applied to remotely sensed data predict characteristics of forests, such as tree canopy height, effect spatial non-stationarity in modeling process is oftentimes neglected. Previous studies have proposed methods address variance at local scales, but few explored autocorrelation pattern residuals height or investigated relationship between and model performance. By combining Light Detection Ranging (LiDAR) Landsat datasets, we used...