A review of benthic faunal surveys in San Francisco Bay

Nichols, Frederic H.

doi:10.3133/cir677

Cited by 6 publications

(3 citation statements)

References 24 publications

(30 reference statements)

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“…Washington (1984) cited a lack exploration of it's biological relevance. Nichols (1973) criticized the past use of diversity indices in the San Francisco Bay estuary stating that they were employed without regard for standardizing methodology and species identification, or an understanding of the natural biological processes that affect them. Most of the criticisms have been very subjective, while in applied studies d values give additional information to competent ecologists which enables them to ask questions and formulate hypotheses about the environment.…”

Section: Discussionmentioning

confidence: 99%

Macrobenthic community structure before and after pollution abatement in the Neches River estuary (Texas)

Harrel

Hall

1991

Hydrobiologia

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Macrobenthosand physicochemical conditions in the lower 39 km of the Neches River estuary were studied from August, 1984 to May, 1985 The results were compared with data collected in 1971 . Between 1972 the permitted BOD waste load in the tidal Neches River was reduced from 123 125 kg d to 8 717 kg d. River discharge and dissolved oxygen concentrations were consistently higher and salinity was lower, during the same seasons, during the 1984-1985 study. A total of 50 taxa of macrobenthos were collected in 1971-1972 and 104 taxa were collected in 1984-1985. The numbers of taxa per collection at each station in 1984-1985 were at least twice those found in 1971 . Minimum densities in 1984 were much higher than the maximum densities in 1971-1972 at all stations. Patterns of dominance, Sorenson's similarity index, and diversity (2) values indicated improved water quality in 1984-1985. Statistical analysis of macrobenthic diversity indicated significant differences between upper estuary and lower estuary stations in [1971][1972]. No significant differences were found in 1984-1985. Significant differences in numbers of taxa, macrobenthos densities, and d values between the two studies were found. Reductions of waste loads, increased river discharge, and deepening of the navigation channel were among the factors that probably contributed most to the changes in community structure of the macrobenthos observed.

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Section: Discussionmentioning

confidence: 99%

Macrobenthic community structure before and after pollution abatement in the Neches River estuary (Texas)

Harrel

Hall

1991

Hydrobiologia

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“…This report summarizes the data from the benthic core collections and discusses some of the sampling results in terms of seasonal changes and year-to-year trends. Most benthic studies in San Francisco Bay have been limited to one area of the bay or have involved infrequent sampling (see Nichols, 1973, Hopkins, 1986, for review and listing of benlhic studies). Accurate characterization of seasonal changes in the benlhic community can be made only with frequent sampling (Nichols, 1985); the monthly samples collected during the present study should be highly useful in such characterization.…”

Section: Multiply Metric Unit Bymentioning

confidence: 99%

Temporal variations in the benthic communities at four intertidal sites in San Francisco Bay, California, 1983-85

Hopkins¹

1987

Open-File Report

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Benthic core samples were collected monthly from January 1983 through January 1985 at four intertidal sites in San Francisco Bay, California, two in the northern part of the bay (North Bay) and two in the southern part of the bay (South Bay). Considerable variation was observed in numbers of species and individuals at the four sites, and abundances within species varied widely. Temporal changes in species abundances appeared to be related to freshwater inflow patterns and resultant salinity variations in the estuary. The 1982-83 winter season was extremely wet, with heavy freshwater inflow to the bay from January through March, whereas the 1983-84 winter was closer to a normal pattern, with most rainfall occurring from November through January. Species were grouped into four categories depending on their patterns of abundance during the two-year period. Species that showed an abundance peak in the North Bay in 1983 only were Corophiwn sp.B and a Chironomidae larva, apparently responding to the extended period of lowered salinity throughout spring and early summer. Species with an abundance peak only in 1984 included Corophiwn acherusicum, Eteone californica, Nereis sucdnea, and Grandidierella japonica, typical estuarine species that might have been suppressed during the extended freshwater inflows in 1983. Species with peaks in both years were Gemma gemma and Ampelisca abdita in the South Bay; both showed strong seasonal variations. A number of species in both North and South Bays, including dominant members of the intertidal community such as Macoma bahhica and Streblospio benedicti, did not show any consistent seasonal or year-to-year trends. Results of this study suggest that the intensity and timing of freshwater inflow to San Francisco Bay, particularly higher-than-normal inflow during late spring and early summer, may be an important factor in determining the composition of the intertidal benthic communities.

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“…Statistically valid sampling in the estuary is difficult, and some studies of the Bay system organisms have been compromised by lack of effective sampling procedures (15).…”

Section: General Considerationsmentioning

confidence: 99%

Environmental effects of dredging and disposal in the San Francisco Bay estuarine system : a report to the Association of Bay Area Governments /

DiSalvo¹

1978

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A review of benthic faunal surveys in San Francisco Bay

Cited by 6 publications

References 24 publications

Macrobenthic community structure before and after pollution abatement in the Neches River estuary (Texas)

Macrobenthic community structure before and after pollution abatement in the Neches River estuary (Texas)

Temporal variations in the benthic communities at four intertidal sites in San Francisco Bay, California, 1983-85

Environmental effects of dredging and disposal in the San Francisco Bay estuarine system : a report to the Association of Bay Area Governments /

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