Effects of Sedimentation on Incubating Coho Salmon (Oncorhynchus Kisutch) in Prairie Creek, California PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download Effects of Sedimentation on Incubating Coho Salmon (Oncorhynchus Kisutch) in Prairie Creek, California PDF full book. Access full book title Effects of Sedimentation on Incubating Coho Salmon (Oncorhynchus Kisutch) in Prairie Creek, California by Robert M. Coey. Download full books in PDF and EPUB format.
Author: Robert M. Coey
Publisher:
ISBN:
Category : Coho salmon
Languages : en
Pages : 268
Get Book Here
Book Description
Author: Robert M. Coey
Publisher:
ISBN:
Category : Coho salmon
Languages : en
Pages : 268
Get Book Here
Book Description
Author: Tancy R. Moore
Publisher:
ISBN:
Category : Coho salmon
Languages : en
Pages : 120
Get Book Here
Book Description
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.
Author:
Publisher:
ISBN:
Category : National parks and reserves
Languages : en
Pages : 56
Get Book Here
Book Description
Author: Peter Drobny
Publisher:
ISBN:
Category : Coho salmon
Languages : en
Pages : 136
Get Book Here
Book Description
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.
Author:
Publisher:
ISBN:
Category : Environmental monitoring
Languages : en
Pages : 166
Get Book Here
Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 558
Get Book Here
Book Description
Author: Barbara L. McCoy
Publisher:
ISBN:
Category : Coho salmon
Languages : en
Pages : 82
Get Book Here
Book Description
Author: Emerson Kanawi
Publisher:
ISBN:
Category : Coho salmon
Languages : en
Pages : 54
Get Book Here
Book Description
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.
Author: Natalie B. Okun
Publisher:
ISBN:
Category : Coho salmon
Languages : en
Pages : 64
Get Book Here
Book Description
Substantial time, money, and effort are invested in river and stream restoration projects to aid in the recovery of imperiled salmonid populations, but there is little evidence that these efforts have had lasting positive impacts on juvenile fish growth and survival. To assess the effectiveness of large woody debris (LWD) restoration, which is one of the most common restoration practices, I evaluated the growth and survival response of endangered Central California Coast coho salmon (Oncorhynchus kisutch) in a paired watershed before-after impact-control (BACI) study. To determine if LWD supplementation influenced coho salmon growth and survival, two neighboring, similar watersheds in Northern California were selected to conduct long-term monitoring of both fish and habitat metrics. Fish and habitat monitoring consisted of summer and fall electrofishing surveys, juvenile outmigrant trapping, passive integrated transponder (PIT) array detections, and summer and winter habitat surveys. After three years of pre-treatment monitoring in both watersheds, Pudding Creek (the ‘experimental’ watershed) was supplemented with 1,365 cubic meters of LWD throughout 80% of the mainstem anadromous spawning habitat in 2015. Post-treatment monitoring then continued in both watersheds until 2020. Though wood density increased more in the experimental watershed (31%) compared to the control watershed (13%) following wood treatment, there was no winter slow water habitat response, meaning the limiting factor for coho populations in these watersheds was not addressed. I used generalized linear mixed effects models with year as a random effect to evaluate summer and winter growth response to wood supplementation. I found that summer and winter growth were positively associated with wood, but the experimental watershed had consistently higher winter growth compared to the control. The wood treatment response did not align with the biological response; wood density increased more in the experimental watershed, but growth did not increase more in the experimental compared to the control watershed. To estimate winter survival rates, I used a Cormack-Jolly-Seber (CJS) model. I found that winter survival increased through time in the control while it stayed level in the experimental watershed. This thesis illuminates the utility of having a paired watershed study design with habitat and biological response analysis in tandem. The results from this experiment lead to a variety of questions and concerns relating to the treatment design and how treatment is paired with the study design. This thesis provides a foundation for long-term monitoring to understand the effects of restoration efforts for a species at the southern extent of its range. This is particularly important given the at-risk status of these salmonid populations and the additional threats these fish face from a changing climate.
Author:
Publisher:
ISBN:
Category : Ecology
Languages : en
Pages : 406
Get Book Here
Book Description
Coverage: 1982- current; updated: monthly. This database covers current ecology research across a wide range of disciplines, reflecting recent advances in light of growing evidence regarding global environmental change and destruction. Major ares of subject coverage include: Algae/lichens, Animals, Annelids, Aquatic ecosystems, Arachnids, Arid zones, Birds, Brackish water, Bryophytes/pteridophytes, Coastal ecosystems, Conifers, Conservation, Control, Crustaceans, Ecosyst em studies, Fungi, Grasses, Grasslands, High altitude environments, Human ecology, Insects, Legumes, Mammals, Management, Microorganisms, Molluscs, Nematodes, Paleo-ecology, Plants, Pollution studies, Reptiles, River basins, Soil, TAiga/tundra, Terrestrial ecosystems, Vertebrates, Wetlands, Woodlands.
