Light and Turbidity

Light and Turbidity

Light exclusion from turbidity is one of the most important effects of suspended matter on algae for it interferes with their photosynthetic action depriving them of active growth. Some reports imply that plankton were thirteen times more abundant in clear and 1.5 times more abundant in moderately turbid water than in muddy ponds.

The two Rotophytons mentioned earlier, Batrachosphermum grow in cool seasons, but unlike Lemanea is apparently limited by high light sensitivity. The Rotophyta of fresh water are indeed adapted to grow at low light intensities. On the other hand, many Diatoms appear to be fairly indifferent to light in that they occur as abundantly in shaded places as in open ones. Many Chlorophyceae require a fairly high light intensity. This is indicated not only by their increase in spring and early summer, but their distribution in shaded and lit areas of stream beds.

It is indeed easy to observe the way in which conspicuous green algae disappear from a stream bed when it enters a deeply shaded reach and this phenomena of heavy mid-summer shade accounts for the fact that many species are abundant in early summer and fall and comparatively scarce in high summer.

An algal community kept at just over 18° C increased its rate of production of oxygen as light was increased, but that over 11,400 lux which is considerably less than full sunlight photosynthesis actually declined. At 8 to 10° C, the rate of photosynthesis continued to rise to the highest level of illuminating tested. It was however much lower than at the warmer temperatures. At the lowest light intensity in the higher temperature, respiration exceeded photosynthesis, a further demonstration of lower efficiency in warmer water.

Next Topics…

XXX
XXY
XXZ



Leave a Reply

Your email address will not be published. Required fields are marked *

You may use these HTML tags and attributes: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <strike> <strong>

...more from Dr. Gordon Snyder
Dr. Gordon Snyder on Google


Phone: (206) 440-3008 • info@sciencefaircenter.com

Home | Site Map | Privacy Policy | Customer Service | Contact Us | Links

Visa Master Card AmEx PayPal

Please visit our family of websites

School water science fair projects
ScienceFairWater.com
ScienceFairCenter.com online store
ScienceFairCenterEnvironmental.com online store
SciencefairCenterWater.com online store
HydroPodnics.com online store
Watercenter.org

Scrapbook card making paper crafts
Urbanscrapbooker.com
Urbanscrapbooker.com online store
Scrapbook supplies donation progrm
Scrapbooking - card making classes
Scrapbook newsletter
Scrapbook store map contact us
Urban Scrapbooker blog
Urban Scrapbooker videos

Whales Without Borders
WhalesWithoutBorders.com
WhalesWithoutBorders.org
WhalesWithoutBorders.info
WhalesWithoutBorders.net

Water filters, water test kits, water equipment
Watercenter.com
Watercenterfilters.com
Watercenter.net
Battle Bottled Water Info
Water Logged Blog

Music, music composition, restore vinyl records
BarrySebastian.com
SebastionAndTheDeepBlue.com
Dyslexichiphop.com
Cleanlp.com
Cleanlps.com online store
JonesTechServices.com
spam prevention

All our websites are different...
Website created by Gordon Snyder and hosted by: synergos.com
Last updated on:
Family Friendly Website Safe Surf Sites Water Friendly Website Award Internet Rating Content Assoc.
www.sciencefairwater.com © 1998 - 2013 Gordon Snyder & Consultants, Inc., All rights reserved .