Striped Bass (Morone saxatilis) Monitoring Techniques in the Sacramento-San Joaquin Estuary

Stevens, Donald E.

doi:10.1016/b978-0-08-021950-9.50014-4

Cited by 18 publications

(19 citation statements)

References 6 publications

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“…This variation with river flow is consistent with the direct observation that diatom concentrations are at a maximum during summer at intermediate river flows (Cloern et al, 1983). Furthermore, river flow is believed to be coupled to fisheries resources (Stevens, 1979;Armor & Herrgesell, 1985). Because of this possible coupling and the apparent usefulness of dissolved silica, dissolved silica distributions should be described and analyzed in more temporal and spatial detail.…”

Section: Additional Considerations/unanswered Questionssupporting

confidence: 85%

Interannual variability in dissolved inorganic nutrients in northern San Francisco Bay estuary

et al. 1985

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Nearly two decades of seasonal dissolved inorganic nutrient-salinity distributions in northern San Francisco Bay estuary illustrate interannual variations in effects of river flow (a nutrient source) and phytoplankton productivity (a nutrient sink). During winter, nutrient sources dominate the nutrient-salinity distribution patterns (nutrients are at or exceed conservative mixing concentrations). During summer, however, the sources and sinks are in close competition. In summers of wet years, the effects of increased river flow often dominate the nutrient distributions (nutrients are at or less than conservative mixing concentrations), whereas in summers of dry years, phytoplankton productivity dominates (the very dry years 197661977 were an exception for reasons not yet clearly known). Such source/sink effects also vary with chemical species. During summer the control of phytoplankton on nutrient distributions is apparently strongest for ammonium, less so for nitrate and silica, and is the least for phosphate. Furthermore, the strength of the silica sink (diatom productivity) is at a maximum at intermediate river flows. This relation, which is in agreement with other studies based on phytoplankton abundance and enumeration, is significant to the extent that diatoms are an important food source for herbivores.The balance or lack of balance between nutrient sources and sinks varies from one estuary to anotherjust as it can from one year to another within the same estuary. At one extreme, in some estuaries river flow dominates the estuarine dissolved inorganic nutrient distributions throughout most of the year. At the other extreme, phytoplankton productivity dominates. In northern San Francisco Bay, for example, the phytoplankton nutrient sink is not as strong as in less turbid estuaries. In this estuary, however, river effects, which produce or are associated with near-conservative nutrient distributions, are strong even at flows less than mean-annual flow. Thus, northern San Francisco Bay appears to be an estuary in between the two extremes and is shifted closer to one extreme or the other depending on interannual variations in river flow. Hydrobiologia 129, 37-58 (1985). 0 Dr W. Junk Publishers, Dordrecht. Printed in the Netherlands.

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Section: Additional Considerations/unanswered Questionssupporting

confidence: 85%

Interannual variability in dissolved inorganic nutrients in northern San Francisco Bay estuary

et al. 1985

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“…The vast majority of studies are dietary investigations whose main purpose was to quantify the diets of game fishes (e.g., Thomas 1967;Stevens 1966;Bryant and Arnold 2007;Nobriga and Feyrer 2007), although several more recent studies directly address consumption of prey by predatory fishes (Lindley and Mohr 2003;Cavallo et al 2012;Loboschefsky et al 2012;FISHBIO 2013;Nobriga et al 2013). The landmark dietary studies in Turner and Kelly (1966) provide important information for both game and several non-game species.…”

Section: Predation Studies On Delta Fishesmentioning

confidence: 99%

Predation on Fishes in the Sacramento-San Joaquin Delta: Current Knowledge and Future Directions

Grossman¹

2016

SFEWS

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“…1, solid line). The 38 mm index is a measure of year class abundance obtained by the California Department of Fish and Game (CDFG) from tow net surveys conducted in July at fixed sampling stations following the spawning period (Stevens 1977). The index averaged 75 in the 1960s, 48 in the 1970s and 24 in the 1980s.…”

Section: Introductionmentioning

confidence: 99%

The effect of agricultural discharge on striped bass (Morone saxatilis) in California's Sacramento-San Joaquin drainage

et al. 1994

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The striped bass (Morone saxatilis) population of the Sacramento-San Joaquin Delta has declined approximately 80% since the mid-1970s. This decline has been attributed to factors such as water diversions, pollution and reduced abundance of food organisms. One source of potential pollutants is agricultural return water. The Colusa Basin Drain discharges water from over 150 000 acres and can account for over 20% of the flow of the Sacramento River. Because discharge occurs at the same time striped bass are spawning, early developmental stages could be adversely affected. Toxicity studies conducted over a 3 year period consistently demonstrated acute toxicity to striped bass larvae and to opossum shrimp (Neomysis mercedis), an important food organism for juvenile striped bass. Acute toxicity was also demonstrated with striped bass embryos. In addition, a model based on pesticide use more effectively predicted striped bass recruitment during the period of decline than did a model based on historically important river flows and delta diversions. These studies indicate that agricultural return water should not be disregarded when considering potential causes of the decline of striped bass.

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Striped Bass (Morone saxatilis) Monitoring Techniques in the Sacramento-San Joaquin Estuary

Cited by 18 publications

References 6 publications

Interannual variability in dissolved inorganic nutrients in northern San Francisco Bay estuary

Interannual variability in dissolved inorganic nutrients in northern San Francisco Bay estuary

Predation on Fishes in the Sacramento-San Joaquin Delta: Current Knowledge and Future Directions

The effect of agricultural discharge on striped bass (Morone saxatilis) in California's Sacramento-San Joaquin drainage

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