Extracellular release of photosynthetic products by freshwater phytoplankton populations, with special reference to the algal species involved

The effect of the insecticide methoxychlor (2,2-bis(p-methoxyphenyl)-1,1,1-trichloroethane) on photosynthetic carbon assimilation by natural phytoplankton populations was determined by incubation of plankton samples in situ at a 1.0-metre depth with [14C]bicarbonate for 4-h periods with or without 100 parts per billion (ppb) (100 μg/l) pure or technical grade methoxychlor. The different algal populations occurring over a 5-week period in May and June in Lake Opinicon, Leeds County, Ontario, were found, in 19 experiments, to be seldom affected by the insecticide. In the few cases where carbon assimilation in methoxychlor-treated samples was found to be significantly lower than that of the controls, the inhibition ranged in extent from 9.7% to 67.4% and these effects could not be correlated unequivocally with cell number or with the presence of any particular algal species.

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The British freshwater phytoplankton, with special reference to the desmid-plankton and the distribution of British desmids

Proceedings of the Royal Society of London. Series B, Containing Papers of a Biological Character ◽

10.1098/rspb.1909.0016 ◽

1909 ◽

Vol 81 (547) ◽

pp. 165-206 ◽

Cited By ~ 28

Keyword(s):

Special Reference ◽

Freshwater Phytoplankton

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Correlations Between Specific Algae and Heavy Metal Binding in Lakes

Journal of the Fisheries Research Board of Canada ◽

10.1139/f78-232 ◽

1978 ◽

Vol 35 (11) ◽

pp. 1482-1485 ◽

Cited By ~ 17

Author(s):

Frédéric Briand ◽

Ramiro Trucco ◽

S. Ramamoorthy

Keyword(s):

Heavy Metal ◽

Green Algae ◽

Metal Binding ◽

Physicochemical Parameters ◽

Binding Capacity ◽

Algal Species ◽

Freshwater Phytoplankton ◽

Heavy Metal Binding ◽

A Minor

Long-term experiments conducted at Heney Lake, Quebec, show the binding capacity for the metal ions Cu2+, Hg2+, Pb2+, and Cd2+ to be related to algal species composition rather than to total algal biomass or physicochemical parameters. Most of the binding could be accounted for by certain species of green algae, diatoms, and chrysomonads that usually constituted only a minor fraction of the total algal volume. Key words: freshwater phytoplankton, heavy metal binding, field study, diatoms, chrysomonads, green algae

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Accumulation of Photoassimilatory Products by Phycobiliprotein- Containing Algae with Special Reference to Cyanidium caldarium

Zeitschrift für Naturforschung C ◽

10.1515/znc-1979-1221 ◽

1979 ◽

Vol 34 (12) ◽

pp. 1209-1214 ◽

Cited By ~ 13

Author(s):

Bruno P. Kremer ◽

Guido B. Feige

Keyword(s):

Special Reference ◽

Host Cell ◽

Algal Species ◽

The Other ◽

Anabaena Cylindrica ◽

Cyanidium Caldarium ◽

Blue Green Algae ◽

Red Algal ◽

Algal Host ◽

Rhodella Violacea

Representatives of phycobiliprotein-containing algae such as Anabaena cylindrica, Anacystis ni- dulans, Gloeotrichia echinulata (Cyanophyceae), Chroomonas spec., Hemiselmis rufescens, Rhodomonas spec. (Cryptophyceae), Porphyridium cruentum, Rhodella violacea (Rhodophyceae) along with the unicellular Cyanidium caldarium (unspecified systematic status) have been investigated for their typical photoassimilatory accumulation products. While the red algal species synthesize a rather specific heteroside, 2-O-ᴅ-glycerol-α-ᴅ-galactopyranoside (= floridoside), not encountered in the other species analyzed, blue-green algae accumulate fructose, glucose, and sucrose, while the cryptomonads accumulate only glucose and. to a lesser extent, fructose. Cyanidium synthesizes neither disaccharides, nor a heteroside, but shows rapid 14C-labelling of fructose and glucose. These results are compared with further biochemical and structural findings and are discussed with emphasis on chemotaxonomic implications. Cyanidium caldarium is proposed as an endocyanome consisting of a single endocyanella providing the functions of a chromatophore in a colourless (apoplastidal algal?) host cell.

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Growth at the limits: comparing trace metal limitation of a freshwater cyanobacterium (Dolichospermum lemmermannii) and a freshwater diatom (Fragilaria crotonensis)

Scientific Reports ◽

10.1038/s41598-021-04533-9 ◽

2022 ◽

Vol 12 (1) ◽

Author(s):

Markus Dengg ◽

Claudine H. Stirling ◽

Malcolm R. Reid ◽

Piet Verburg ◽

Evelyn Armstrong ◽

...

Keyword(s):

Trace Metals ◽

Trace Metal ◽

Growth Rates ◽

Algal Species ◽

Cyanobacterial Blooms ◽

Taupo Volcanic Zone ◽

Growth Responses ◽

Freshwater Phytoplankton ◽

Key Species ◽

Fragilaria Crotonensis

AbstractFreshwater phytoplankton blooms are increasing in prevalence and there are conflicting views on whether trace metals limit growth of key species and thus bloom formation. The Taupō Volcanic Zone (TVZ), New Zealand, was formed by multiple eruptions of a super-volcano which emitted rhyolitic tephra leaving lakes depleted in trace metals. This provides an opportunity to test the potential of trace metal limitation on freshwater phytoplankton growth under nanomolar concentrations. Growth responses of two algal species isolated from Lake Taupō, Dolichospermum lemmermannii (cyanobacteria) and Fragilaria crotonensis (diatom), to six biologically important trace metals (manganese, iron, zinc, cobalt, copper and molybdenum) were examined in culture experiments. These were conducted at three trace metal concentrations: (1) ambient, (2) two-times ambient, and (3) ten-times ambient concentrations in Lake Taupō. Elevated concentrations of iron significantly increased growth rates and maximum cell densities in D. lemmermannii, whereas no significant concentration dependence was observed for other trace metals. Fragilaria crotonensis showed no significant growth response to elevated concentrations of trace metals. These results highlight the importance of iron as a growth limiting nutrient for cyanobacteria and indicate that even small (twofold) increases in Fe concentrations could enhance cyanobacteria growth rates in Lake Taupō, potentially causing cyanobacterial blooms.

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