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.

Spatio-temporal distribution of Green Sturgeon (Acipenser medirostris) and White Sturgeon (A. transmontanus) in the San Francisco Estuary and Sacramento River, California

2020 ◽  
Vol 103 (5) ◽  
pp. 577-603 ◽  
Author(s):  
Emily A. Miller ◽  
Gabriel P. Singer ◽  
Matthew L. Peterson ◽  
Eric D. Chapman ◽  
Myfanwy E. Johnston ◽  
...  
Keyword(s):  
San Francisco ◽  
Temporal Distribution ◽  
San Francisco Estuary ◽  
Sacramento River ◽  
White Sturgeon ◽  
Green Sturgeon ◽  
Acipenser Medirostris ◽  
Spatio Temporal

White Sturgeon Spawning in the San Joaquin River, California, and Effects of Water Management

2015 ◽  
Vol 7 (1) ◽  
pp. 171-180 ◽  
Author(s):  
Zachary J. Jackson ◽  
Joshua J. Gruber ◽  
Joel P. Van Eenennaam
Keyword(s):  
Water Management ◽  
San Francisco ◽  
San Francisco Estuary ◽  
Sacramento River ◽  
White Sturgeon ◽  
Late Winter ◽  
Successful Management ◽  
Pulse Flow ◽  
San Joaquin River ◽  
The World

Abstract Inadequate recruitment is a hallmark of declining sturgeon populations throughout the world. Efforts to understand and address the processes that regulate recruitment are of foremost importance for successful management and recovery. Fish biologists previously only knew San Francisco Estuary white sturgeon (Acipenser transmontanus) to spawn in the Sacramento River, California. We assessed potential white sturgeon spawning locations by deploying artificial substrate samplers during late winter and spring of 2011 and 2012 from river kilometers 115.2 to 145.3 of the San Joaquin River. Collections of fertilized eggs, coupled with hydrology data, confirm that white sturgeon spawned within one and four sites in the San Joaquin River during wet (2011; n = 23) and dry (2012; n = 65) water-year conditions. Small pulse flow augmentations intended to benefit juvenile salmonids appear to have triggered white sturgeon spawning within this system. Understanding the effects of water management on spawning and subsequent recruitment is necessary to increase white sturgeon recruitment to the San Francisco Estuary.

Polyploid microsatellite data reveal stock complexity among estuarine North American green sturgeon (Acipenser medirostris)

2009 ◽  
Vol 66 (9) ◽  
pp. 1491-1504 ◽  
Author(s):  
Joshua A. Israel ◽  
K. Jun Bando ◽  
Eric C. Anderson ◽  
Bernie May
Keyword(s):  
North American ◽  
West Coast ◽  
Clustering Analysis ◽  
Pairwise Comparisons ◽  
Green Sturgeon ◽  
Microsatellite Data ◽  
Distinct Population ◽  
The West ◽  
Acipenser Medirostris ◽  
Genetic Clustering

North American green sturgeon ( Acipenser medirostris ) display the distinctive behavior of long ocean migrations along the west coast punctuated by summer residence in estuaries; however, little is known about stock composition in these tidal environments. Pairwise comparisons and genetic clustering analysis were used to characterize the two green sturgeon Distinct Population Segments (DPSs) from 20 collections using eight tetrasomic and two disomic microsatellite loci. The observed pattern of green sturgeon DPS composition among five estuaries in California, Oregon, and Washington was supported with assignment testing approaches utilizing the same genotypic data in codominant polysomic and pseudodominant allele phenotype formats. The majority of individuals in northern DPS estuaries originated from the threatened Southern DPS, except in Winchester Bay and Grays Harbor. We detected few Northern DPS green sturgeon in San Pablo Bay, the principal Southern DPS estuary, supporting that green sturgeon preferentially disperse north once they enter their coastal migration. Our genetic findings suggest that stock complexity in green sturgeon is pervasive and support precautionary, interjurisdictional approaches for managing green sturgeon beyond rigid, regulatory boundaries.

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

Biology, Management, and Protection of North American Sturgeon

2002 ◽  
Keyword(s):  
Growth Rate ◽  
Incubation Temperature ◽  
Larval Survival ◽  
Sampling Time ◽  
White Sturgeon ◽  
Green Sturgeon ◽  
Acipenser Medirostris ◽  
Relative Growth ◽  
Klamath River ◽  
Length Relationship

<em>Abstract.</em>—Gametes of green sturgeon <em>Acipenser medirostris</em> (caught in the Klamath River, California) and farm-reared white sturgeon <em>A. transmontanus</em> were obtained using hormonal induction of ovulation and spermiation. The offspring of one female in each species were reared in the laboratory, to compare their development and growth. Green and white sturgeon embryos had similar rates of development and hatched after 169 h and 176 h, respectively, at incubation temperature 15.7 ± 0.2°C. Embryos of both species exhibited similar holoblastic development and passed through 36 stages characteristic of acipenserids. Green sturgeon fertilization and hatching rates were 41.2% and 28.0%, compared with 95.4% and 82.1% for the white sturgeon. Larval survival to 45 d (metamorphosis) was 93.3% in green and 92.1% in white sturgeon. Newly hatched green sturgeon (length 13.7 ± 0.4 mm, mean ± SD) were larger and less pigmented, compared with white sturgeon. They had large ovoid yolk sacs and did not exhibit pelagic behavior that was observed in white sturgeon. The onset of exogenous feeding in green sturgeon occurred at age 10–15 d and length 24.0 ± 0.5 mm, and metamorphosis was completed at age 45 d and length 74.4 ± 5.9 mm (rearing temperature 18.5 ± 0.2°C). Weight and length of green sturgeon larvae and juveniles were considerably greater than in white sturgeon at each sampling time, but the relative growth rate and weight-length relationship were similar in both species. This suggests an effect of larger egg size and maternal yolk supply on the growth of green sturgeon. We conclude that green sturgeon differs from the white sturgeon in their reproductive strategy and, potentially, reproductive habitat.

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
Sign in / Sign up

Export Citation Format

Share Document