Population Status of North American Green Sturgeon, Acipenser medirostris

Adams, P.; Grimes, Churchill B.; Hightower, Joseph E.; Lindley, Steven T.; Moser, Mary L.; Parsley, Michael J.

doi:10.1007/s10641-006-9062-z

Cited by 76 publications

(94 citation statements)

References 18 publications

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“…These species of sturgeon have received a lot of attention due to their vulnerability to anthropogenic activities such as overfishing, habitat alterations, and chemical contaminants (Kohlhorst, 1980;Linville et al, 2002;NMFS, 2006). The Southern Distinct Population Segment (DPS) of green sturgeon that inhabit in the SFBD (Adams et al, 2007) are currently listed as threatened under the Endangered Species Act (NMFS, 2006), and white sturgeon are listed as State S2 status (low abundance, restricted range, and potentially endangered species) in the California Natural Diversity Database (2009). Given the anticipated climate change impacts in the SFBD, environmental alterations such as decreasing food availability and increasing salinity have been recently spotlighted due to the implications for green and white sturgeon population resilience Klimley et al, 2015;Lee et al, 2015;Vaz et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Effects of feed restriction on the upper temperature tolerance and heat shock response in juvenile green and white sturgeon

Lee

Hung

Fangue

et al. 2016

Comparative Biochemistry and Physiology Part A: Molecular &

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The objective of the current study was to investigate the effects of feed restriction on whole-organism upper thermal tolerance and the heat shock response of green and white sturgeon to determine how changes in food amount might influence physiological performance of each species when faced with temperature stress. Two parallel feed restriction trials were carried out for juvenile green (202 g; 222-day post hatch: dph) and white sturgeon (205 g; 197-dph) to manipulate nutritional status at 12.5%, 25%, 50%, or 100% of optimum feeding rate (100% OFR were 1.6% and 1.8% body weight/day, respectively) for four weeks. Following the trials, the critical thermal maximum (CTMax, 0.3°C/min) of sturgeon (N = 12/treatment/species) was assessed as an indicator of whole-organism upper thermal tolerance. To assess temperature sensitivity, sturgeon (N = 9/treatment/species) were acutely transferred to two temperature treatments (28°C and 18°C as a handling control) for 2 h followed by 2 h of recovery at 18°C before being sacrificed, and gill, brain, and mucus sampled for measurements of 70-kDa heat shock protein levels (Hsc/Hsp70). Feeding rate had species-specific effects on CTMax in green and white sturgeon such that CTMax of green sturgeon decreased as the magnitude of feed restriction increased; whereas, CTMax of white sturgeon did not change with feed restriction. Elevated temperature (28°C) and feed restriction increased Hsc/Hsp70 levels in the gill tissue of green sturgeon, while heat shock increased Hsc/ Hsp70 levels in the mucus of white sturgeon. Our results suggest that green sturgeon may be more susceptible to temperature stress under food-limited conditions.

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Section: Introductionmentioning

confidence: 99%

Effects of feed restriction on the upper temperature tolerance and heat shock response in juvenile green and white sturgeon

Lee

Hung

Fangue

et al. 2016

Comparative Biochemistry and Physiology Part A: Molecular &

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“…Briefly, anadromous adult green sturgeon spend most of their lives in the marine environment, with seasonal migrations between natal freshwater spawning grounds and the ocean. Adults of the Northern DPS, which is classified as a species of concern by the National Oceanic and Atmospheric Administration (NOAA) of the USA, spawn in rivers north of the Eel River of northwest California (Adams et al 2007). The Southern DPS is classified as threatened under the Endangered Species Act, and all suspected and confirmed spawning locations are within the watershed of the Sacramento and San Joaquin rivers (Adams et al 2007).…”

Section: Introductionmentioning

confidence: 99%

“…Adults of the Northern DPS, which is classified as a species of concern by the National Oceanic and Atmospheric Administration (NOAA) of the USA, spawn in rivers north of the Eel River of northwest California (Adams et al 2007). The Southern DPS is classified as threatened under the Endangered Species Act, and all suspected and confirmed spawning locations are within the watershed of the Sacramento and San Joaquin rivers (Adams et al 2007). As juvenile green sturgeon are intolerant of full strength seawater until they are 0.5 to 1.5 years old (Allen and Cech 2007;Allen et al 2009Allen et al , 2011, habitat is restricted to the fresh to brackish water sections of the SFE for early life stages.…”

Section: Introductionmentioning

confidence: 99%

Effects of nutritional deprivation on juvenile green sturgeon growth and thermal tolerance

et al. 2015

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“…Of particular relevance to the North American Pacific Coast is the green sturgeon (Acipenser medirostris), a long-lived, anadromous fish whose populations experience a variety of negative anthropogenic impacts (Adams et al 2007). The Northern distinct population segment (DPS), which spawns in two river systems (Klamath, California (CA), and Rogue, Oregon (OR)), was listed as a species of concern by NOAA Fisheries.…”

Section: Introductionmentioning

confidence: 99%

“…The Northern distinct population segment (DPS), which spawns in two river systems (Klamath, California (CA), and Rogue, Oregon (OR)), was listed as a species of concern by NOAA Fisheries. The Southern DPS, spawning only in the highlymodified Sacramento River, CA, is listed under the Endangered Species Act as threatened (Adams et al 2007). After reaching sexual maturity at 13-20 years of age, individuals spawn in natal streams every 2-5 years thereafter (Moyle 2002;Van Eenennaam et al 2006;Erickson and Webb 2007).…”

Section: Introductionmentioning

confidence: 99%

Energetic requirements of green sturgeon (Acipenser medirostris) feeding on burrowing shrimp (Neotrypaea californiensis) in estuaries: importance of temperature, reproductive investment, and residence time

et al. 2017

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Habitat use can be complex, as tradeoffs among physiology, resource abundance, and predator avoidance affect the suitability of different environments for different species. Green sturgeon (Acipenser medirostris), an imperiled species along the west coast of North America, undertake extensive coastal migrations and occupy estuaries during the summer and early fall. Warm water and abundant prey in estuaries may afford a growth opportunity. We applied a bioenergetics model to investigate how variation in estuarine temperature, spawning frequency, and duration of estuarine residence affect consumption and growth potential for individual green sturgeon. We assumed that green sturgeon achieve observed annual growth by feeding solely in conditions represented by Willapa Bay, Washington, an estuary annually frequented by green sturgeon and containing extensive tidal flats that harbor a major prey source (burrowing shrimp, Neotrypaea californiensis). Modeled consumption rates increased little with reproductive investment (<0.4%), but responded strongly (10-50%) to water temperature and duration of residence, as higher temperatures and longer residence Environ Biol Fish (2017) required greater consumption to achieve equivalent growth. Accordingly, although green sturgeon occupy Willapa Bay from May through September, acoustically-tagged individuals are observed over much shorter durations (34 d + 41 d SD, N = 89). Simulations of <34 d estuarine residence required unrealistically high consumption rates to achieve observed growth, whereas longer durations required sustained feeding, and therefore higher total intake, to compensate for prolonged exposure to warm temperatures. Model results provide a range of per capita consumption rates by green sturgeon feeding in estuaries to inform management decisions regarding resource and habitat protection for this protected species.

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Population Status of North American Green Sturgeon, Acipenser medirostris

Cited by 76 publications

References 18 publications

Effects of feed restriction on the upper temperature tolerance and heat shock response in juvenile green and white sturgeon

Effects of feed restriction on the upper temperature tolerance and heat shock response in juvenile green and white sturgeon

Effects of nutritional deprivation on juvenile green sturgeon growth and thermal tolerance

Energetic requirements of green sturgeon (Acipenser medirostris) feeding on burrowing shrimp (Neotrypaea californiensis) in estuaries: importance of temperature, reproductive investment, and residence time

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