Reduction of growth rate and resting spore formation in a marine diatom exposed to low levels of cadmium

Sanders, James G.; Cibik, S. J.

doi:10.1016/0141-1136(85)90136-9

Cited by 15 publications

(11 citation statements)

References 30 publications

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“…This finding is supported in studies of other diatoms (Durbin 1978, Davis et al 1980, Garrison 1981, Sanders and Cibik 1985 and dinoflagellates (Anderson et al 1984, Anderson and Lindquist 1985. Resting spore formation is now believed to be one of the common life-form responses and a way to resist depletion of limiting nutrients in some planktonic algae.…”

Section: Discussionmentioning

confidence: 53%

Life-form population responses of a marine planktonic diatom,Chaetoceros pseudocurvisetus, to oligotrophication in regionally upwelled water

Kuwata

Takahashi

1990

Mar. Biol.

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Abstract.Life-form population responses of a centric planktonic diatom, Chaetoceros pseudocurvisetus Mangin, were investigated in summer 1986 and 1988 in the Izu Islands, Japan, in regionally upwelled water where nutrient concentration changed from favorable to unfavorable conditions for active growth and reproduction (oligotrophication). Two types of life form were observed: vegetative cells of healthy and unhealthy looking conditions and resting spores. The observed life-form responses were experimentally evaluated along with a depletion of limiting nutrients. The algal population ceased vegetative growth and initiated resting spore formation with a disappearance of limiting nitrate, and this life-form response seemed to be triggered by the decrease of cellular nitrogen content below a certain level. Since a large amount of silicon was required for the resting spore formation, a part of vegetative cells were unable to form resting spores and formed unhealthy looking vegetative cells under insufficient concentrations of silicic acid. Percentage shares of the resting spores in the population were linearly related to the amounts of available silicic acid. Vegetative cells which did not form resting spores showed greater mortality than resting spores by attack of bacteria and protozoa; however, vegetative cells could respond quickly to possible nutrient replenishment.

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Section: Discussionmentioning

confidence: 53%

Life-form population responses of a marine planktonic diatom,Chaetoceros pseudocurvisetus, to oligotrophication in regionally upwelled water

Kuwata

Takahashi

1990

Mar. Biol.

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“…Cadmium on the other hand is more likely to remain in the dissolved, highly bioavailable, form (Bryan and Langston, 1992). Furthermore it is also worth noting that, in its free ionic form, Cd (along with Cu and other metals) is generally accepted to be at its most toxic (Sunda et al, 1978;Pesch and Stewart, 1980;Sanders and Cibik, 1985).…”

Section: Metal Contamination Of Musselsmentioning

confidence: 97%

Phosphate industry discharges and their impact on metal contamination and intertidal macrobenthos: Jorf Lasfar and Safi coastlines (morocco)

Cheggour

Langston

Chafik

et al. 1999

Toxicological & Environmental Chemistry

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At Jorf Lasfar and Safi, on the Moroccan Atlantic coastline, there are chemical industry plants that produce phosphate derivates including phosphoric acid and fertilizers, together with by-products such as sulphuric acid. The liquid effluents of the plants are discharged directly into the sea. In order to evaluate their impact, we have compared the distribution of intertidal macrobenthos in several locations, along gradients subjected to differing degrees of phosphate industry pollution. The results illustrate how biological diversity and species densities decrease abruptly in the vicinity of these industrial effluents, and also how recovery, as measured by the same parameters, proceeds with distance from the discharge points. Mussels Mytilus galloprovincialis were heavily contaminated by Cu and Cd at both study locations and their shells showed four kinds of deformities, notably at the Jorf Lasfar site, where the effluents were more aggressive (high in metals, low pH).

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“…Many of the diatoms identified in these sediment cores were small for their species; this phenomenon became more pronounced through time (toward the top of the cores). This reduction in valve size may be due to the fact that higher nutrient content in the Chesapeake Bay over time has become conducive to increased vegetative proliferation of cells, with less sexual reproduction (which produces larger valves) and less resting spore formation (French and Hargraves 1985, Sanders and Cibik 1985, Stoermer et a!. 1989.…”

Section: Diatom Taxa With Notes On Their Abundance and Autecologymentioning

confidence: 99%

“…Most of the spores counted are more abundant in older (pre-European) sediments, becoming more scarce in recent sediments. This may be a result of higher nutrient content (especially nitrogen) of the Bay in recent times, allowing more vegetative reproduction of the cells, with less resting spore formation (French andHargraves 1985, Sanders andCibik 1985). There is also evidence that toxins, such as heavy metals, in the water column impair resting spore formation (Sanders and Cibik 1985).…”

Section: Diatom Taxa With Notes On Their Abundance and Autecologymentioning

confidence: 99%

Chesapeake Bay Watershed Historical Land Use: Impact on Water Quality and Diatom Communities

Cooper¹

1995

Ecological Applications

195

104

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Stratigraphic records preserved in the sediments of the mesohaline Chesapeake Bay were used to reconstruct a 2000‐yr history of sedimentation, eutrophication, anoxia, and diatom community structure over time. Diatoms, pollen, total and organic carbon (TOC), total and organic nitrogen, total sulfur, acid‐soluble iron, an estimate of the degree of pyritization of iron (DOP), and biogenic silica (BSi) were used as paleoecological indicators in four cores collected from a transect across the Chesapeake Bay from the Choptank River to Plum Point, Maryland. This paper covers results for diatoms, pollen, and BSi. Sediments were dated using radiocarbon and pollen techniques, and sedimentation rates were determined (0.2‐5.8 mm/yr) using pollen methods. Geochemical indicators were measured and diatom species identified at subsampled intervals within each core. More than 400 diatom species, primarily marine and estuarine taxa, were identified in the sediments, some for the first time. Analysis of the data indicates that sedimentation rates, eutrophication, turbidity, and anoxia have increased in the Chesapeake Bay since the time of European settlement of the watershed. There is also evidence that freshwater input to the mesohaline Chesapeake Bay has increased. Changes in diatom community structure and geochemical indicators reflect major changes in land use patterns of the watershed and increasing population. Diatom community diversity exhibits a continuing decline, while centric/pennate ratios rise dramatically in most recent sediments.

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Reduction of growth rate and resting spore formation in a marine diatom exposed to low levels of cadmium

Cited by 15 publications

References 30 publications

Life-form population responses of a marine planktonic diatom,Chaetoceros pseudocurvisetus, to oligotrophication in regionally upwelled water

Life-form population responses of a marine planktonic diatom,Chaetoceros pseudocurvisetus, to oligotrophication in regionally upwelled water

Phosphate industry discharges and their impact on metal contamination and intertidal macrobenthos: Jorf Lasfar and Safi coastlines (morocco)

Chesapeake Bay Watershed Historical Land Use: Impact on Water Quality and Diatom Communities

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