Old School vs. New school: Status of Threadfin Shad (Dorosoma petenense) Five Decades After its Introduction to the Sacramento–San Joaquin Delta

Feyrer, Frederick; Sommer, Ted; Slater, Steven B.

doi:10.15447/sfews.2009v7iss1art3

Cited by 17 publications

(13 citation statements)

References 37 publications

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“…We recognize that we cannot fully distinguish whether the difference between the two SIMPROF groups was truly from the same factors that caused the POD regime shift or simply from the differences between wet and dry years, because most of the pre-POD years covered in our study period (1995 to 2002) were wet years. Nevertheless, this observation underscores the importance of analyzing the abundance trends for non-listed, commercially unimportant fish species in the estuary (e.g., Feyrer et al 2009). …”

Section: Discussionmentioning

confidence: 92%

Abundance Trends, Distribution, and Habitat Associations of the Invasive Mississippi Silverside (Menidia audens) in the Sacramento–San Joaquin Delta, California USA

Mahardja¹,

Conrad²,

Lusher³

et al. 2016

SFEWS

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Although many alien fish species have colonized the Sacramento-San Joaquin Delta (Delta), few are as pervasive and abundant as Mississippi Silversides (Menidia audens). Moreover, Mississippi Silversides are hypothesized to be an intra-guild predator of the endangered Delta Smelt (Hypomesus transpacificus). Because of their prevalence in the Delta and potential predation on Delta Smelt, Mississippi Silversides may have far-reaching effects on both the aquatic ecosystem and conservation management policies of the region. Yet little is known about how Mississippi Silverside abundance and distribution have changed within the Delta, or how they respond to various habitat attributes such as temperature, turbidity, and flow. We examined 19 years of beach seine survey data to evaluate how the abundance and distribution of Mississippi Silversides has changed over the years, characterize their habitat associations, and determine the environmental factors that predict their annual cohort strength. Concurrent with the decline of several pelagic fish species in the San Francisco Estuary in the early 2000s, we observed a significant increase in Mississippi Silverside catch that was accompanied by a moderate distributional shift in which densities increased in the western Delta region. We also found that the occurrence of this highly prolific alien species was associated with higher water temperature, higher turbidity, relatively low conductivity, and moderate to high levels of dissolved oxygen. Lastly, we demonstrated that freshwater input to the Sacramento-San Joaquin Delta during the summer and water exports during the spring months were both negatively correlated with the annual cohort size of Mississippi Silversides in the region. Our study identified the environmental variables deserving additional attention in future studies involving Mississippi Silverside and suggests that the species favors habitat conditions that are likely to be detrimental for pelagic species such as Delta Smelt. KEY WORDSMississippi Silverside, invasive species biology, Menidia audens, littoral fish, life history RESEARCH

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Section: Discussionmentioning

confidence: 92%

Abundance Trends, Distribution, and Habitat Associations of the Invasive Mississippi Silverside (Menidia audens) in the Sacramento–San Joaquin Delta, California USA

Mahardja¹,

Conrad²,

Lusher³

et al. 2016

SFEWS

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“…Phytoplankton, particularly diatoms, support zooplankton (such as the calanoid copepods E. affinis and P. forbesi) (Sautour et al 1996;Breitburg et al 1999;Tan et al 2004) and mysid larvae (including the once dominant N. mercedis) (Linkage 3.11) (Siegfried and Kopache 1980;Bernát et al 1994;Froneman 2001). These planktonic invertebrates in turn support planktivorous fishes (such as delta smelt) and filter-feeding fishes (such as threadfin shad) (Linkage 5.11) (Kjelson 1971;Domermuth and Reed 1980;Bernát et al 1994;Lott 1998;Feyrer et al 2009). This pelagic web also supports larvae of fishes at the critical period in their ontogenetic development when they are transforming from the yolk stage to the first feeding stage (Nobriga 2002;Nobriga and Feyrer 2007).…”

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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“…Striped bass was deliberately introduced to the Sacramento-San Joaquin Delta from the east coast of the United States in 1879 and supports a sport fishery (Moyle 2002). Threadfin shad was introduced into California reservoirs as a forage fish in 1954 and spread to the Delta (Moyle 2002, Feyrer et al 2009).…”

Section: Introductionmentioning

confidence: 99%

Analysis of pelagic species decline in the upper San Francisco Estuary using multivariate autoregressive modeling (MAR)

Nally

Thomson

Kimmerer

et al. 2010

Ecological Applications

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142

133

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Four species of pelagic fish of particular management concern in the upper San Francisco Estuary, California, USA, have declined precipitously since ca. 2002: delta smelt (Hypomesus transpacificus), longfin smelt (Spirinchus thaleichthys), striped bass (Morone saxatilis), and threadfin shad (Dorosoma petenense). The estuary has been monitored since the late 1960s with extensive collection of data on the fishes, their pelagic prey, phytoplankton biomass, invasive species, and physical factors. We used multivariate autoregressive (MAR) modeling to discern the main factors responsible for the declines. An expert-elicited model was built to describe the system. Fifty-four relationships were built into the model, only one of which was of uncertain direction a priori. Twenty-eight of the proposed relationships were strongly supported by or consistent with the data, while 26 were close to zero (not supported by the data but not contrary to expectations). The position of the 2 per thousand isohaline (a measure of the physical response of the estuary to freshwater flow) and increased water clarity over the period of analyses were two factors affecting multiple declining taxa (including fishes and the fishes' main zooplankton prey): Our results were relatively robust with respect to the form of stock-recruitment model used and to inclusion of subsidiary covariates but may be enhanced by using detailed state-space models that describe more fully the life-history dynamics of the declining species.

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Old School vs. New school: Status of Threadfin Shad (Dorosoma petenense) Five Decades After its Introduction to the Sacramento–San Joaquin Delta

Cited by 17 publications

References 37 publications

Abundance Trends, Distribution, and Habitat Associations of the Invasive Mississippi Silverside (Menidia audens) in the Sacramento–San Joaquin Delta, California USA

Abundance Trends, Distribution, and Habitat Associations of the Invasive Mississippi Silverside (Menidia audens) in the Sacramento–San Joaquin Delta, California USA

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

Analysis of pelagic species decline in the upper San Francisco Estuary using multivariate autoregressive modeling (MAR)

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