Temperature and manganese as determining factors in the presence of diatom or blue-green algal floras in streams.

Abstract:

:Diatoms are usually the major component of the algal flora in many streams, although green and blue-green algae may be present. These experiments were designed to determine if high temperature or a shift in the chemical composition of the water might bring about a dominance of blue-green algae and/or green algae rather than a dominance of diatoms in the algal flora.The results of these experiments indicate that an average temperature of 34 degrees to 38 degrees C results in a shift of dominance in the algal flora from diatoms to blue-green algae. Furthermore, a blue-green and green algal flora of species typically found in organically polluted water in favored if the manganese content is a few parts per billion. If the manganese content averaged 0.02-0.043 mg/liter in the natural stream to 0.04-0.28 mg/liter in the recycled water experiment, a diatom flora remained dominant.

authors

Patrick R,Crum B,Coles J

doi

10.1073/pnas.64.2.472

subject

Has Abstract

pub_date

1969-10-01 00:00:00

pages

472-8

issue

2

eissn

0027-8424

issn

1091-6490

journal_volume

64

pub_type

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