Results 351 to 360 of about 314,412 (387)

Toxicity of Mercury to Phytoplankton

Nature, 1972
MERCURY in the environment has been a recent topic of discussion1–4. According to Hammond2 there are no quantitative measurements of the movement of mercury through the environment. The standards for mercury levels (5 µg l.−1 for drinking water, 0.5 p.p.m. for consumable fish) which have been adopted in the United States are based on toxicity to humans
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On advection in phytoplankton models

Journal of Theoretical Biology, 1973
Abstract Scale analysis is used to deduce a new non-dimensional number, S = C [(A H τ) 1 2 V m ] which defines the importance of advection of phytoplankton by organized fluid motion in spatial models of marine food chains. When S ⪢ 1, advection greatly affects biological productivity; when S ⪡ I, advection may be neglected ...
James J. O'Brien, J. S. Wroblewski
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Drivers of phytoplankton blooms

Science, 2016
Plankton Dynamics Despite decades of study, there is little evidence to link increases in phytoplankton growth in response to springtime warming with the dynamics of phytoplankton blooms. This lack of understanding makes it difficult to make predictions about global biogeochemical cycling in response to climate change. Hunter-Cevera et al.
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Phytoplankton in Sardinian reservoirs

Giornale botanico italiano, 1996
Abstract A picture of the studies carried out in the past 20 years on phytoplankton from the 36 reservoirs and one natural lake in Sardinia is presented. Processing of the 1994 seasonal data shows that the dominant or subdominant algal species in the 36 reservoirs in terms of density belong to only 8 genera, with species of the genus Microcystis in 17 ...
SECHI, Nicola, LUGLIÈ, Antonella Gesuina Laura   +1 more
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Dynamics of phytoplankton–zooplankton systems with toxin producing phytoplankton

Applied Mathematics and Computation, 2014
We propose periodic systems of phytoplankton-zooplankton interactions with toxin producing phytoplankton to study the effects of TPP upon extinction and persistence of the populations. Using the concept of uniform persistence, it is proved that the two populations can coexist for certain parameter regimes.
Jang, Sophia, Baglama, James, Wu, Li
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Production Biology of Phytoplankton

1997
Abstract : To continue to critically and creatively review knowledge about interactions between bulk marine phytoplankton and zooplankton with the hydrographic and chemical environment, as well as the feedback from the biological processes to the abiotic environment. The emphasis is on regional oceanography.
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Calefaction and Phytoplankton

BioScience, 1971
for a continuous performance of phytoplanktonic organisms. Seasonal, diurnal, and geographical variations in temperature and the occurrence of organisms under different, even extreme, conditions indicate that life, in general, is possible in a very wide temperature range.
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Cadmium in Marine Phytoplankton

2012
The distribution of cadmium in the ocean is very similar to that of major nutrients suggesting that it may be taken up by marine phytoplankton at the surface and remineralized at depth. This interpretation is supported by recent data on Cd isotope distribution showing an increase in the (112)Cd/(110)Cd ratio in Cd-depleted surface water.
François M. M. Morel, Yan Xu, Yan Xu
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Phosphorus and Phytoplankton

Science, 1959
Ronald C. Phillips, L. A. Whitford
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Phytoplankton and Periphyton

1997
Most studies of Amazonian algae concentrate on phytoplankton. Taxonomy and aspects of community structure are discussed by Gronblad (1945); Forster (1969, 1974); Martins (1980); Scott et al. (1965); Uherkovich (1981); Uherkovich and Schmidt (1974); Uherkovich and Rai (1979); Thomasson (1971), and many others.
Wolfgang J. Junk, Rainer Putz
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