Remarkable invasion of San Francisco Bay (California, USA), by the Asian clam Potamocorbula amurensis. I. Introduction and dispersal

Carlton, JT; Tompson, JK; Schemel, LE; Nichols, FH

doi:10.3354/meps066081

Cited by 274 publications

(157 citation statements)

References 7 publications

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“…These organisms may be subjected to tidal or seasonal shifts in salinity that limit their range or their ability to forage and reproduce (Kimmerer 2004). Both of the invasive clams P. amurensis and C. fluminea are reciprocally limited by salinity: the former by fresh water (below ~2 psu) and the latter by brackish water (above ~2 psu) (Carlton et al 1990;Nichols et al 1990;Hymanson et al 1994). The mechanism of limitation is thought to act on the recruitment stage, when clam larvae are most vulnerable to halide stress; adults have mechanical and physiological mechanisms to resist salinity stress (Paganini et al 2010;Miller and Stillman 2013;Miller et al 2014).…”

Section: Salinitymentioning

confidence: 99%

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A Conceptual Model of the Aquatic Food Web of the Upper San Francisco Estuary

Durand¹

2015

SFEWS

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Section: Salinitymentioning

confidence: 99%

“…Two species of bivalves rapidly expanded their range (Carlton et al 1990;Nichols et al 1990) and began effectively competing with zooplankton for phytoplankton (Linkage 3.14) (Thompson 2005), as well as preying directly on zoo-…”

Section: Diagram 7-synthesismentioning

confidence: 99%

A Conceptual Model of the Aquatic Food Web of the Upper San Francisco Estuary

Durand¹

2015

SFEWS

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“…Modifications to local food web dynamics driven by GCC, such as declining phytoplankton production as well as disruption of trophic linkages between phytoplankton and zooplankton (Winder and Schindler, 2004;Auad et al, 2006;Boyce et al, 2010) have become important issues with respect to indirect effects of GCC on species' vulnerability to environmental change due to the potential for reduced energy flow among trophic levels. The SFBD is considered an estuary of low productivity in comparison to other estuaries worldwide (Cloern et al, 2014), due in large part to the introduction of the invasive Asian clam (Corbula amurensis) in the 1980s (Carlton et al, 1990;Cloern and Jassby, 2012). The high feeding efficiency of the Asian clam exceeds the local production of phytoplankton biomass (Thompson, 2005) and has contributed to substantial declines of fish population in the SFBD (Kimmerer, 2006;Moyle et al, 2012).…”

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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“…A decline to now chronically low chlorophyll-a (chl-a) concentrations occurred in the northern SFE in the late 1980s and was attributed mainly to grazing by the overbite clam, Corbula amurensis (Carlton et al, 1990), which was introduced to the estuary in 1986 (Alpine and Cloern, 1992). However, C. amurensis abundance alone may be insufficient to explain annual chl-a trends, as winter chl-a in the northern estuary began to decline before the clam's introduction (Jassby et al, 2002) and rare spring phytoplankton blooms have been observed in the northern SFE (Dugdale et al, submitted;Wilkerson et al, 2006;Glibert et al, 2011;Dugdale et al, submitted) since the clam's introduction even while clam biomass has been relatively stable.…”

Section: Introductionmentioning

confidence: 99%

The effect of inorganic nitrogen speciation on primary production in the San Francisco Estuary

Parker

Hogue

Wilkerson

et al. 2012

Estuarine, Coastal and Shelf Science

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Keywords:San Francisco Estuary primary production phytoplankton carbon ammonium nitrate a b s t r a c tWe describe the results of a series of 96-h enclosure experiments conducted using water from stations in the northern San Francisco Estuary (SFE) along a gradient in ammonium (NH 4 ) and nitrate (NO 3 ) concentrations. Using dual-labeled 13 C/ 15 N tracers, we followed the timing and sequence of primary (carbon, C) production and phytoplankton nitrogen (N) use during experimental phytoplankton blooms. Our results show that diatoms consistently drive the phytoplankton blooms in the enclosures. By tracing both C and N uptake we provide clear evidence that high rates of C uptake are linked to phytoplankton NO 3 , and not NH 4 , use. Results from kinetics experiments demonstrated higher specific uptake rates (V MAx ) for NO 3 compared to NH 4 in the SFE. Finally, dissolved inorganic carbon and nutrient drawdown ratios in the enclosures from the chronically high NH 4 regions of the SFE were substantially lower than predicted from the Redfield ratio, suggesting suppressed C uptake, in relation to other elemental uptake. Our conceptual model of the DIN interactions that lead to higher primary production and phytoplankton blooms in the SFE suggests that higher rates of primary production that accompany phytoplankton NO 3 uptake are sufficient to outpace phytoplankton losses, leading to blooms, compared to the lower rates associated with NH 4 uptake (only 20% of that based upon NO 3 ). Historical changes in wastewater practices have increased the proportion of NH 4 to the DIN pool in the SFE leading to reduced access to NO 3 by phytoplankton. This may help to explain some of the reduced primary production and phytoplankton biomass observed there since the 1970s.

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Remarkable invasion of San Francisco Bay (California, USA), by the Asian clam Potamocorbula amurensis. I. Introduction and dispersal

Cited by 274 publications

References 7 publications

A Conceptual Model of the Aquatic Food Web of the Upper San Francisco Estuary

A Conceptual Model of the Aquatic Food Web of the Upper San Francisco Estuary

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

The effect of inorganic nitrogen speciation on primary production in the San Francisco Estuary

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