Author: Karen A. Boortz (Graduate student)Publisher:
ISBN:
Category : Aquatic resources conservation
Languages : en
Pages : 0
Book Description
Macroinvertebrate Prey Variations for Juvenile Chinook Salmon in the San Joaquin River
Author: Karen A. Boortz (Graduate student)Publisher:
ISBN:
Category : Aquatic resources conservation
Languages : en
Pages : 0
Book Description
Outmigration Survival of Juvenile Spring-run Chinook Salmon in Relation to Physicochemical Conditions in the San Joaquin River
Author: Colby HausePublisher:
ISBN:
Category :
Languages : en
Pages : 0
Book Description
Extirpation of Central Valley spring-run Chinook salmon ESU (Oncorhynchus tshawytscha) from the San Joaquin River is emblematic of salmonid declines across the Pacific Northwest. Previous telemetry studies monitoring reintroduction of threatened spring-run Chinook salmon to the San Joaquin River revealed low out-migration survival of juveniles from rehabilitated upriver habitats to the ocean. To evaluate the link between overall habitat conditions and survivorship, we combined state-of-the-art habitat mapping approaches (Fast Automated Limnological Measurements or "FLAMe") with classic acoustic telemetry technology along the 270 km emigration corridor in Spring of 2019. We used classification algorithms on FLAMe data to develop a zonation scheme for aquatic habitats along the mainstem San Joaquin River, including a portion of the Delta. Despite elevated flow conditions in 2019, outmigration survival of smolts was again comparatively low (5%). However, our habitat-based classification scheme described variation in survival of acoustic-tagged juvenile spring-run Chinook salmon better than other candidate models based on geography or distance. Two regional mortality sinks were evident along the water quality transect, revealing poor survival in areas with higher temperatures and low levels of chlorophyll-[alpha], fDOM, and turbidity. These findings illustrate an overall value in integrating simple classification frameworks to improve our understanding of habitat variation on survival dynamics of imperiled salmonid populations.
Juvenile Chinook Salmon Use of Nearshore Habitats on the San Joaquin River, California
Author: U.S. Fish and Wildlife Service. Ecological Services. Sacramento Field OfficePublisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 44
Book Description
Survival and Migration Route Probabilities of Juvenile Chinook Salmon in the Sacramento-San Joaquin River Delta During the Winter of 2007-2008
Author: Russell W. PerryPublisher:
ISBN:
Category : Chinook salmon
Languages : en
Pages : 94
Book Description
The Needs of Chinook Salmon, Oncorhynchus Tshawytscha in the Sacramento-San Joaquin Estuary
Author: Movement and Survival of Juvenile Chinook Salmon in California's Central Calley
Author: Gabriel P. SingerPublisher:
ISBN: 9781658413169
Category :
Languages : en
Pages :
Book Description
Riverine ecosystems around the world have undergone extensive anthropogenic alterations, often to the detriment of native aquatic biodiversity. Migratory fishes are particularly vulnerable to habitat fragmentation and degradation. For example, Chinook Salmon populations in the Sacramento and San Joaquin Rivers, CA have been declining for nearly a century. Its Mediterranean climate, position in a landscape dominated by urban and agricultural land use, and the presence of an inland delta that serves as the hub of California's vast water conveyance system, makes this a particularly perilous region for migrating juvenile salmon. These studies use acoustic telemetry as tool to investigate survival and routing of juvenile fall and spring-run Chinook salmon during their riverine and estuarine migratory phases in the Sacramento and San Joaquin Rivers. Survival to the ocean in these river systems is already lower relative to other Chinook Salmon populations in North American. Tracking studies included investigations of the sub-lethal effects of tagging fish with acoustic transmitters, movement ecology and survival of two distinct evolutionary significant units of Chinook Salmon during an historic drought, and the movement ecology and survival of a reintroduced population of Chinook Salmon in the San Joaquin River.
Distribution and Joint Fish-Tag Survival of Juvenile Chinook Salmon Migrating Through the Sacramentro-San Joaquin River Delta, California, 2008
Author: U.S. Department of the InteriorPublisher: CreateSpace
ISBN: 9781497346291
Category : Nature
Languages : en
Pages : 36
Book Description
Chinook salmon in California's Central Valley were decimated in the 19th and 20th centuries by overfishing, dam construction, channelization, population, and water diversions.
Draft Amendment 14, Pacific Coast Salmon Plan
Author: Survival and Migration Route Probabilities of Juvenile Chinook Salmon in the Sacramento-San Joaquin River Delta During the Winter of 2009?10
Author: U.S. Department Of The InteriorPublisher: CreateSpace
ISBN: 9781497389861
Category :
Languages : en
Pages : 34
Book Description
Juvenile Chinook salmon (Oncorhynchus tshawytscha) emigrating from natal tributaries of the Sacramento River may use a number of migration routes to negotiate the Sacramento-San Joaquin River Delta (hereafter, "the Delta"), each of which may influence their probability of surviving. We applied a mark-recapture model to data from acoustically tagged juvenile late-fall Chinook salmon that migrated through the Delta during the winter of 2009-10 (hereafter, 2010). This report presents findings from our fourth year of research.
Contributions to the Biology of Central Valley Salmonids: Chinook salmon in the lower American River, California's largest urban stream
Author: Randall L. BrownPublisher:
ISBN:
Category : Fishery management
Languages : en
Pages : 380
Book Description