Microscopy Primer
Light and Color
Microscope Basics
Special Techniques
Digital Imaging
Confocal Microscopy
Live-Cell Imaging
Photomicrography
Microscopy Museum
Virtual Microscopy
Fluorescence
Web Resources
License Info
Image Use
Custom Photos
Partners
Site Info
Contact Us
Publications
Home

The Galleries:

Photo Gallery
Silicon Zoo
Pharmaceuticals
Chip Shots
Phytochemicals
DNA Gallery
Microscapes
Vitamins
Amino Acids
Birthstones
Religion Collection
Pesticides
BeerShots
Cocktail Collection
Screen Savers
Win Wallpaper
Mac Wallpaper
Movie Gallery

Differential Interference Contrast Image Gallery

Zygnema Filamentous Algae

Zygnema is a genus of filamentous algae whose members characteristically possess two star-shaped chloroplasts per cell. Zygnema species are often found alongside other types of algae and may combine to form large greenish-brown mats or clouds in ponds and other still bodies of water.

Capable of proliferating in several different ways, reproduction of Zygnema species is primarily dependent upon environmental conditions. When nitrates and phosphates are readily available, Zygnema generally reproduce vegetatively by fragmenting to create new strands. However, when conditions are less favorable, Zygnema often asexually produce akinetes, spore-like bodies that have very thick cell walls that enable them to survive harsh conditions. In poor environments, members of the genus may also reproduce sexually to create a zygospore that sinks into the sediment at the bottom of the body of water, where it waits to emerge until more propitious circumstances arise.

Large populations of Zygnema can significantly affect the pH level of an aquatic environment. During daylight hours, the hair-like strands of algae produce considerable volumes of dissolved oxygen. At night, however, there is a reverse in the metabolic process and the masses of Zygnema consume oxygen and generate carbon dioxide as a waste product of cellular respiration. When the creation of carbon dioxide in the water is very rapid due to substantial numbers of Zygnema, the pH level changes too quickly for many other aquatic organisms to easily adjust, resulting in stress and aberrant behavior.

BACK TO THE DIC IMAGE GALLERY

Questions or comments? Send us an email.
© 1998-2013 by Michael W. Davidson and The Florida State University. All Rights Reserved. No images, graphics, scripts, or applets may be reproduced or used in any manner without permission from the copyright holders. Use of this website means you agree to all of the Legal Terms and Conditions set forth by the owners.
This website is maintained by our
Graphics & Web Programming Team
in collaboration with Optical Microscopy at the
National High Magnetic Field Laboratory.
Last modification: Friday, Aug 01, 2003 at 11:43 AM
Access Count Since April 22, 2003: 19306
For more information on microscope manufacturers,
use the buttons below to navigate to their websites: