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Overwinter Survival And Redistribution Of Juvenile Coho Salmon Oncorhynchus Kisutch In Prairie Creek California
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Book Synopsis Overwinter Survival and Redistribution of Juvenile Coho Salmon, Oncorhynchus Kisutch, in Prairie Creek, California by : Tancy R. Moore
Download or read book Overwinter Survival and Redistribution of Juvenile Coho Salmon, Oncorhynchus Kisutch, in Prairie Creek, California written by Tancy R. Moore and published by . This book was released on 2014 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt: During the summer of 2012, juvenile coho salmon (Oncorhynchus kisutch) in Prairie Creek, California and its tributaries were marked using PIT tags to monitor winter redistribution and estimate overwinter growth and survival. Since a substantial number of juvenile coho salmon in the Prairie Creek watershed may rear in freshwater for two years, a scale sample analysis was also conducted to determine what proportion of the 2012 population was exhibiting a two-year freshwater residency. The Cormack-Jolly-Seber model and Program MARK were used to examine how rearing location, size at tagging, habitat unit depth, and volume of large woody debris affected overwinter survival. I found that 98.6% of juveniles in 2012 were age 0, and apparent overwinter survival was 39.4%. On average, juveniles experienced a 0.13% increase in length per day and 0.35% increase in weight per day, with the smallest fish experiencing the highest growth rates. Fish that were larger in fall and tagged closer to the confluence of Prairie Creek had higher apparent overwinter survival, but habitat depth and quantity of large woody debris did not appear to impact survival probability. Large juveniles appeared to have low survival near the confluence of Prairie Creek; however, the model could not distinguish deaths from emigration, meaning the high mortality rate for large juveniles near the mouth may actually reflect a pattern of early emigration from the study area. Since juveniles that migrate to sea prior to spring trapping are typically treated as mortalities, these results have important implications for the way managers estimate freshwater survival for coho salmon.
Book Synopsis Influence of Body Size, Intra- and Inter-specific Salmonid Densities, and Habitat on Overwinter Survival of Juvenile Coho Salmon (Oncorhynchus Kisutch) in Prairie Creek, California by : Peter Drobny
Download or read book Influence of Body Size, Intra- and Inter-specific Salmonid Densities, and Habitat on Overwinter Survival of Juvenile Coho Salmon (Oncorhynchus Kisutch) in Prairie Creek, California written by Peter Drobny and published by . This book was released on 2016 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: I evaluated the effects of fish length, habitat attributes, and densities of Coho Salmon and trout on overwinter survival of juvenile Coho Salmon in Prairie Creek, California. Survival of PIT tagged juvenile Coho Salmon was estimated using a Cormack-Jolly-Seber Model based on mark-recapture data from seine net captures, PIT tag antenna detections, and a rotary screw trap. A zero inflated Poisson binomial model, based on a 2-pass snorkeling methodology, estimated pool-specific abundance of juvenile Coho Salmon while accounting for variable snorkeler detection efficiency as well as estimating the effect of habitat attributes on density. Trout densities were obtained using raw snorkel counts. Overwinter survival of PIT tagged juvenile Coho Salmon during 2014-2015 was estimated to be 0.35 (95% CI 0.30-0.40), similar to survival estimates for Prairie Creek in previous years. Survival increased with fish length and decreased with intraspecific density. There was no evidence that density of small (150 mm) trout, large (150 mm) trout, or habitat attributes influenced survival. Estimated density of juvenile Coho Salmon in pools averaged 0.5 fish/m2 (n= 159) and ranged from 0- 2.2 fish/m2, consistent with regional density values within the Pacific Northwest. Juvenile Coho Salmon density estimates declined with cover complexity and watershed area, and increased with pool depth. Probability of detecting a fish while snorkeling varied with habitat features and among observers; estimated probability of detection averaged 0.63 (n=318) and ranged from 0.19 to 0.96 across snorkel passes.This study not only continued valuable monitoring of juvenile Coho Salmon overwinter survival in the southern portion of their range, but also determined factors that may be contributing to survival rates. In addition, this study successfully applied a relatively new hierarchical modeling technique (N-mixture model) to estimate juvenile Coho Salmon densities using non-invasive methods.
Book Synopsis Survival, Growth, and Movement of Juvenile Coho Salmon (Oncorhynchus Kisutch) Over-wintering in Alcoves, Backwaters, and Main Channel Pools in Prairie Creek, California by : Ethan Bell
Download or read book Survival, Growth, and Movement of Juvenile Coho Salmon (Oncorhynchus Kisutch) Over-wintering in Alcoves, Backwaters, and Main Channel Pools in Prairie Creek, California written by Ethan Bell and published by . This book was released on 2001 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Abundance and Survival Rates of Juvenile Coho Salmon (Oncorhynchus Kisutch) in Prairie Creek, Redwood National Park by : Kyle E. Brakensiek
Download or read book Abundance and Survival Rates of Juvenile Coho Salmon (Oncorhynchus Kisutch) in Prairie Creek, Redwood National Park written by Kyle E. Brakensiek and published by . This book was released on 2002 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Overwinter Survival and Growth of Juvenile Coho Salmon, Oncorhynchus Kisutch, in Freshwater Creek, California by : Jennifer J. Hauer
Download or read book Overwinter Survival and Growth of Juvenile Coho Salmon, Oncorhynchus Kisutch, in Freshwater Creek, California written by Jennifer J. Hauer and published by . This book was released on 2013 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Overwinter Survival and Movement of Juvenile Coho Salmon (Oncorhynchus Kisutch) in Relation to Large Woody Debris and Low-velocity Habitat in Northern California Streams by : John D. Deibner-Hanson
Download or read book Overwinter Survival and Movement of Juvenile Coho Salmon (Oncorhynchus Kisutch) in Relation to Large Woody Debris and Low-velocity Habitat in Northern California Streams written by John D. Deibner-Hanson and published by . This book was released on 2019 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt: Some studies suggest that Coho Salmon populations are limited by overwinter survival as a result of insufficient winter habitat. While many small-scale projects aim to define reach and basin-level habitat requirements for Coho Salmon, large-scale studies that assess multiple independent populations remain few. For my research, I quantified large woody debris (LWD) by volume and low-velocity rearing habitat (LVH) as percent area in three coastal watersheds of similar size in northern California to untangle the relationships between Coho Salmon overwinter survival, emigration timing and specific winter habitats. I used mark-recapture techniques with PIT tags to formulate Cormack-Jolly-Seber models for each of three years (2013-2015) to (1) estimate apparent overwinter survival of juvenile Coho Salmon populations, (2) determine to what extent outmigration timing varies among basins, and (3) evaluate the relationships between reach-specific survival, movement and winter habitat. LWD volume ranged from 47.8 to 109.9 cubic meters per kilometer among stream reaches while LVH area spanned from 9.3% to 23.6% of total stream area per reach. Effects of LWD on apparent overwinter survival and early emigration were absent during all three years of the study. Effects of LVH were not observed during 2013 and 2014. In 2015, LVH correlated positively with apparent overwinter survival and negatively with emigration. Larger Coho Salmon had higher apparent overwinter survival rates than small fish, whereas smaller fish had greater emigrations rates before spring. Mean apparent overwinter survival varied by basin from 0.052 to 0.567 but basins maintained consistency across years. Early emigration rates ranged even further by basin (0.023-0.773). Variation in both apparent overwinter survival and early emigration was much greater among basins than within basins. A lot remains to be learned regarding how habitat affects the migratory behavior of Coho Salmon in California and these results suggest the effects may vary significantly by stream. The drastic life history differences observed in neighboring Coho Salmon populations demonstrate the plasticity in a species once thought to be relatively inflexible. Moving forward, incorporating multi-basin approaches should be considered when evaluating freshwater survival and movement to inform large-scale restoration and conservation.
Book Synopsis A Time- and State-based Approach to Estimate Winter Movement and Survival of Juvenile Coho Salmon (Oncorhynchus Kisutch) in Freshwater Creek, California by : Nicholas Van Vleet
Download or read book A Time- and State-based Approach to Estimate Winter Movement and Survival of Juvenile Coho Salmon (Oncorhynchus Kisutch) in Freshwater Creek, California written by Nicholas Van Vleet and published by . This book was released on 2019 with total page 101 pages. Available in PDF, EPUB and Kindle. Book excerpt: Accounting for life history diversity and overwinter survival of juvenile Coho Salmon is important to inform restoration and recovery efforts for this threatened species. Multiple seaward migration patterns of Coho Salmon have been identified, including spring fry migrants, fall and winter parr migrants, and spring smolt migrants. Previous studies have indicated that spring smolt migrants have low overwinter survival rates while they are rearing in upstream habitats, suggesting that freshwater overwinter survival may be one factor that limits smolt production. However, previous research did not account for the early emigration of fall and winter parr migrants from the study area, which most likely negatively biased their overwinter survival estimates. Furthermore, previous mark-recapture methods aggregated continuous detection data into course seasonal scales in order to estimate movement and survival. In an effort to refine previous methodology, I developed a multi-state model that allowed for estimation of early emigration and survival rates in space and time by having weekly time-varying occasions paired with discrete spatial states.
Book Synopsis Effects of Sedimentation on Incubating Coho Salmon (Oncorhynchus Kisutch) in Prairie Creek, California by : Robert M. Coey
Download or read book Effects of Sedimentation on Incubating Coho Salmon (Oncorhynchus Kisutch) in Prairie Creek, California written by Robert M. Coey and published by . This book was released on 1998 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Environmental Variables Influencing Downstream Migration of Juvenile Coho Salmon (Oncorhynchus Kisutch) in Three Northern California Streams by : Jennifer E. Feola
Download or read book Environmental Variables Influencing Downstream Migration of Juvenile Coho Salmon (Oncorhynchus Kisutch) in Three Northern California Streams written by Jennifer E. Feola and published by . This book was released on 2007 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Historical and Current Presence-absence of Coho Salmon (Oncorhynchus Kisutch) in the Central California Coast Evolutionary Significant Unit by : Peter Burton Adams
Download or read book Historical and Current Presence-absence of Coho Salmon (Oncorhynchus Kisutch) in the Central California Coast Evolutionary Significant Unit written by Peter Burton Adams and published by . This book was released on 1999 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This report is a summary of the presence and absence of coho salmon, Oncorhynchus kisutch, in streams in the Central California Coast Evolutionary Significant Unit (ESU). Only streams with historical records of coho occupancy are considered. It has been prepared to assist in Endangered Species Act activities... Presence absence data used here come from surveys conducted for this study and fron data collected by other researchers. A preliminary report of this data, which included only approximately one-half of these streams, was published earlier... to meet earlier listing requirements."--p.Abstract.
Book Synopsis Over-winter Survival and Habitat Use of Juvenile Coho Salmon (Oncorhynchus Kisutch) in Lake Superior Tributaries by : John E. Ford
Download or read book Over-winter Survival and Habitat Use of Juvenile Coho Salmon (Oncorhynchus Kisutch) in Lake Superior Tributaries written by John E. Ford and published by . This book was released on 1997 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Winter Food Habits of Coastal Juvenile Steelhead and Coho Salmon in Pudding Creek, Northern California by : Heather Anne Pert
Download or read book Winter Food Habits of Coastal Juvenile Steelhead and Coho Salmon in Pudding Creek, Northern California written by Heather Anne Pert and published by . This book was released on 1993 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Survival and Movement of Juvenile Coho Salmon (Oncorhynchus Kisutch) in the Shasta River, California by : Christopher C. Adams
Download or read book Survival and Movement of Juvenile Coho Salmon (Oncorhynchus Kisutch) in the Shasta River, California written by Christopher C. Adams and published by . This book was released on 2013 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: I developed a multi-state mark-recapture model to estimate apparent survival, movement, and detection probabilities among four segments of the Shasta River during the first spring, summer, winter, and age-1 smolt outmigration periods. Apparent survival estimates in different segments of the Shasta River ranged from 0.42 to 0.74 over the summer and from 0.52 to 1.00 over the winter. The estimated apparent survival probability for age-1 smolts migrating from the upper Shasta River to the Klamath River was 0.77. Findings in this study may be used to guide restoration efforts for coho salmon in the Shasta River by focusing them on locations that are not meeting fish needs or during seasonal periods of low survival.
Book Synopsis Marine Survival of Coho Salmon (Oncorhynchus Kisutch) from Small Coastal Watersheds in Northern California by : Sean M. Cochran
Download or read book Marine Survival of Coho Salmon (Oncorhynchus Kisutch) from Small Coastal Watersheds in Northern California written by Sean M. Cochran and published by . This book was released on 2015 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt: California coho salmon Oncorhynchus kisutch populations are at low abundance and factors governing recruitment variability remain unclear. Changes in freshwater habitat that increase juvenile growth and size of salmon outmigrating to sea (smolts) may improve ocean survival. The best data to evaluate this among wild coho salmon populations in California come from life-cycle monitoring (LCM) stations. This study investigated whether marine survival is size-dependent (larger individuals within a cohort have higher marine survival) and whether sites and years with higher growth have higher marine survival across five LCM locations. I tested for size-dependent survival using two techniques: comparing the size of outmigrating smolts and back-calculated smolt sizes from scales of adult fish that survived to return; and using information from fish that were tagged as smolts and survived to return as adults. Analyses comparing smolt sizes back-calculated from adult scales and observed lengths from smolt traps indicated that within-year size-dependent mortality at sea occurred among many outmigrant cohorts, while analyses using smolt lengths of recaptured adult fish tagged as juveniles did not indicate any within-cohort size-selective mortality at sea. Potential explanations for the conflicting results include errors in scale back-calculation; smolts growing in habitats below smolt traps prior to ocean entrance; and fish with alternative juvenile life histories that were unaccounted for in outmigrant sampling surviving and contributing to the adult populations. In regressions across sites and years, marine survival was positively associated with early marine growth measured from the scales of surviving adult salmon and in some instances marine survival was also positively associated with mean fork length of outmigrating smolts. Although size may be an important determinant of ocean survival, this study shows that comparison of back-calculated smolts sizes from scales of adult fish and observed lengths of smolts at an upstream trapping location are unreliable approaches for testing size-selective mortality. This study also provides support for expanding studies at LCM stations to determine how juvenile coho salmon use habitat downstream of migrant trapping locations.
Book Synopsis Comparing Environmental DNA and Traditional Monitoring Approaches to Assess the Abundance of Outmigrating Coho Salmon (Oncorhynchus Kisutch) in California Coastal Streams by : Emerson Kanawi
Download or read book Comparing Environmental DNA and Traditional Monitoring Approaches to Assess the Abundance of Outmigrating Coho Salmon (Oncorhynchus Kisutch) in California Coastal Streams written by Emerson Kanawi and published by . This book was released on 2020 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt: Environmental DNA (eDNA) has the potential to dramatically increase the information available to managers regarding species distribution and abundance. Collection of reliable survey information on fish abundance is essential to monitor population trends and restoration efforts for endangered and threatened species. In Northern California, coho salmon are a federally listed species and a focus of ongoing monitoring programs and restoration projects. I examined the feasibility of using eDNA to supplement, or replace, traditional outmigrating juvenile coho salmon monitoring approaches currently used at two existing coho salmon life-cycle monitoring stations. Over the spring of 2018 and spring of 2019, I collected water samples, water quality, and flow information during the coho salmon smolt migration season at cross-sections of two creeks in Northern Humboldt County, California concurrently with daily downstream migrant trapping. In addition, I compared differences in the amount of eDNA filtered from water samples collected and filtered through multiple filter sizes and material. Extracted DNA was amplified using qPCR and a species-specific assay. Results of model selection using weekly and daily abundance estimates and Flow Corrected eDNA indicate high variability of eDNA concentration both within sites and between sites for each creek. The best-fit models did not include Flow Corrected eDNA; a measure of eDNA concentration adjusted for stream flow. However, when using Flow Corrected eDNA values to generate an additional measure of abundance, Area Under the Curve (AUC), the predictive ability of the models increased significantly on both Prairie and Freshwater Creek. A linear regression resulted in a significant positive relationship that explained 71% of the variation between AUC and the downstream migrant coho salmon estimates on Prairie Creek and 88% of the variation in Freshwater Creek in 2018. Additionally, there was a significant relationship between AUC and the downstream migrant coho salmon estimates in 2019 for only one of the filter sizes tested. These results imply that this approach shows promise for elucidating relationships between eDNA and juvenile coho abundances, but more research is necessary to determine what sampling methods, and analytical approaches, to use in these small lotic systems.
Book Synopsis Extended Freshwater Rearing of Juvenile Coho Salmon (Oncorhynchus Kisutch) in Northern California Streams by : Benjamin O. Ransom
Download or read book Extended Freshwater Rearing of Juvenile Coho Salmon (Oncorhynchus Kisutch) in Northern California Streams written by Benjamin O. Ransom and published by . This book was released on 2007 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Energetic Response of Juvenile Coho Salmon (Oncorhynchus Kisutch) to Varying Water Temperature Regimes in Northern California Streams by : Wendall Scott Willey
Download or read book Energetic Response of Juvenile Coho Salmon (Oncorhynchus Kisutch) to Varying Water Temperature Regimes in Northern California Streams written by Wendall Scott Willey and published by . This book was released on 2004 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt:
