scholarly journals Estimating the Annual Spawning Run Size and Population Size of the Southern Distinct Population Segment of Green Sturgeon

2018 ◽  
Vol 147 (1) ◽  
pp. 195-203 ◽  
Author(s):  
Ethan A. Mora ◽  
Ryan D. Battleson ◽  
Steven T. Lindley ◽  
Michael J. Thomas ◽  
Russ Bellmer ◽  
...  
Keyword(s):  
Population Size ◽  
Green Sturgeon ◽  
Distinct Population ◽  
Distinct Population Segment ◽  
Spawning Run ◽  
Population Segment

scholarly journals Confirmed Observation: A North American Green Sturgeon Acipenser medirostris Recorded in the Stanislaus River, California

2018 ◽  
Vol 9 (2) ◽  
pp. 624-630 ◽  
Author(s):  
Jesse T. Anderson ◽  
Gregg Schumer ◽  
Paul J. Anders ◽  
Kyle Horvath ◽  
Joseph E. Merz
Keyword(s):  
San Francisco ◽  
North American ◽  
San Francisco Estuary ◽  
White Sturgeon ◽  
Green Sturgeon ◽  
Distinct Population ◽  
Acipenser Medirostris ◽  
San Joaquin River ◽  
Distinct Population Segment ◽  
Population Segment

AbstractTwo sturgeon species are native to the San Francisco Estuary watershed in California: White Sturgeon Acipenser transmontanus and North American Green Sturgeon Acipenser medirostris. The San Francisco Estuary has two main tributaries, the Sacramento and San Joaquin rivers. Recent studies have shown that the San Joaquin River is used by Green and White Sturgeon and that at least a small number of White Sturgeon spawn there when environmental conditions allow. However, records of Green Sturgeon in the San Joaquin River and its tributaries are rare and limited to information from angler report cards. In 2006, the National Marine Fisheries Service listed the southern distinct population segment of North American Green Sturgeon as threatened under the Endangered Species Act. Federally designated critical habitat for the southern distinct population segment of Green Sturgeon does not extend upstream of the San Joaquin River's confluence with the Stanislaus River. We recently confirmed an adult Green Sturgeon holding in a deep pool near Knights Ferry, California in the Stanislaus River. We observed and recorded the fish using a GoPro® video camera and used environmental deoxyribonucleic acid sampling techniques to confirm species identification. This paper provides the first confirmed record of Green Sturgeon in any tributary of the San Joaquin River, which is beyond the designated critical habitat area. Future well-designed research focused on the San Joaquin River and its tributaries is expected to improve our understanding regarding the importance of these rivers for the various life stages of North American Green Sturgeon.

scholarly journals Filling knowledge gaps for a threatened species: age and growth of Green Sturgeon of the southern Distinct Population Segment

2021 ◽  
Author(s):  
Marta Elizabeth Ulaski ◽  
Michael C Quist
Keyword(s):  
Age And Growth ◽  
Habitat Modification ◽  
Green Sturgeon ◽  
Distinct Population ◽  
Critical Research ◽  
Acipenser Medirostris ◽  
The Pacific ◽  
Distinct Population Segment ◽  
Similar Growth ◽  
Population Segment

The Green Sturgeon Acipenser medirostris is an anadromous, long-lived species that is distributed along the Pacific coast of North America. Green Sturgeon is vulnerable to global change due to its sensitive life history and few spawning locations. The persistence of Green Sturgeon is threatened by habitat modification, altered flows, and rising river temperatures. The southern Distinct Population Segment was listed as threatened under the U.S. Endangered Species Act in 2001 due to persistent stressors. Despite increased research efforts after the species was listed, substantial gaps in basic population information for Green Sturgeon remain. We present the only known information on age structure and growth of a threatened population of Green Sturgeon. By analyzing archived fin rays that were collected from 1984–2016, we revealed highly variable growth among individuals. We detected several age classes from 0–26 years and found similar growth rates of Sacramento River Green Sturgeon compared to northern populations. Though limited, this analysis is an important first step to understanding Green Sturgeon population dynamics and highlights critical research needs.

Hierarchical spatial genetic structure in a distinct population segment of greater sage-grouse

2014 ◽  
Vol 15 (6) ◽  
pp. 1299-1311 ◽  
Author(s):  
Sara J. Oyler-McCance ◽  
Michael L. Casazza ◽  
Jennifer A. Fike ◽  
Peter S. Coates
Keyword(s):  
Genetic Structure ◽  
Spatial Genetic Structure ◽  
Distinct Population ◽  
Sage Grouse ◽  
Distinct Population Segment ◽  
Population Segment

scholarly journals Movements of Atlantic Sturgeon of the Gulf of Maine Inside and Outside of the Geographically Defined Distinct Population Segment

2017 ◽  
Vol 9 (1) ◽  
pp. 93-107 ◽  
Author(s):  
Gail S. Wippelhauser ◽  
James Sulikowski ◽  
Gayle B. Zydlewski ◽  
Megan A. Altenritter ◽  
Micah Kieffer ◽  
...  
Keyword(s):  
Gulf Of Maine ◽  
Atlantic Sturgeon ◽  
Distinct Population ◽  
Distinct Population Segment ◽  
Population Segment

scholarly journals Anadromy Redux? Genetic Analysis to Inform Development of an Indigenous American River Steelhead Broodstock

2019 ◽  
Vol 10 (1) ◽  
pp. 137-147
Author(s):  
Alicia Abadía-Cardoso ◽  
Annie Brodsky ◽  
Bradley Cavallo ◽  
Martha Arciniega ◽  
John Carlos Garza ◽  
...  
Keyword(s):  
Central Valley ◽  
Genomic Variation ◽  
Spawning Habitat ◽  
Distinct Population ◽  
Negative Effects ◽  
Fish Hatchery ◽  
Distinct Population Segment ◽  
American River ◽  
Hatchery Program ◽  
Population Segment

Abstract The construction of dams and water diversions has severely limited access to spawning habitat for anadromous fishes. To mitigate for these impacts, hatchery programs rear and release millions of juvenile salmonids, including steelhead, the anadromous ecotype of the species Oncorhynchus mykiss. These programs sometimes use nonindigenous broodstock sources that may have negative effects on wild populations. In California, however, only one anadromous fish hatchery program currently uses nonnative broodstock: the steelhead program at Nimbus Fish Hatchery on the American River, a tributary of the Sacramento River in the California Central Valley. The goal of this study was to determine if potentially appropriate sources to replace the broodstock for the Nimbus Hatchery steelhead program exist in the Upper American River, above Nimbus and Folsom dams. We show that all Upper American River O. mykiss sampled share ancestry with other populations in the Central Valley steelhead distinct population segment, with limited introgression from out-of-basin sources in some areas. Furthermore, some Upper American River populations retain adaptive genomic variation associated with a migratory life history, supporting the hypothesis that these populations display adfluvial migratory behavior. Together, these results provide insights into the evolution of trout populations above barrier dams. We conclude that some Upper American River O. mykiss populations represent genetically appropriate sources from which fisheries managers could potentially develop a new broodstock for the Nimbus Hatchery steelhead program to reestablish a native anadromous population in the Lower American River and contribute to recovery of the threatened Central Valley steelhead distinct population segment.

scholarly journals Erratum to: Hierarchical spatial genetic structure in a distinct population segment of greater sage-grouse

2014 ◽  
Vol 15 (6) ◽  
pp. 1313-1314 ◽  
Author(s):  
Sara J. Oyler-McCance ◽  
Michael L. Casazza ◽  
Jennifer A. Fike ◽  
Peter S. Coates
Keyword(s):  
Genetic Structure ◽  
Spatial Genetic Structure ◽  
Distinct Population ◽  
Sage Grouse ◽  
Distinct Population Segment ◽  
Population Segment
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