The Trophic Structure of a Pond Microcommunity


At 40X, micrograph width = 2 mm; at 100X, micrograph width = 0.8 mm; at 400X, micrograph width = 0.2 mm; at 1000X, micrograph width = 0.08 mm.

Note that producers are green, and they sometimes are motile (move).
Consumers are not green, and usually move. They are labeled with a "C" where they appear in the photos below.
It was VERY difficult to photograph the consumers because they constantly move. As a result, they are not entirely in focus.
Remember - draw only producers and consumers, not debris!!
Note: The first 6 drawings were photographed at 100X, and the last 6 were photographed at 400X.


 

 

 
Six views of a typical pond water microcommunity, 100X.

 

 

 
Six views of a typical pond water microcommunity, 400X.

Some common organisms in pond water:

Producers - Algae

A desmid, a tiny algae

By derekkeats [CC-BY-SA-2.0], via Wikimedia Commons

Spirogyra, a filamentous algae

By en:User:Spicywalnut (http://en.wikipedia.org/wiki/File:Spirogyra.JPG) [Public domain], via Wikimedia Commons

Oedogonium, a tiny filamentous algae

By T.Voekler (Own work) [CC-BY-SA-3.0], via Wikimedia Commons

Hydrodictyon, a tiny filamentous algae

[Creative Commons Attribution-Share Alike 3.0 Unported or GNU] via Wikimedia Commons.

Diatoms, tiny unicellular glass-shelled algae
By Damián H. Zanette [Public domain],
via Wikimedia Commons

Microscopic green algae
By Simon Andrews (Own work) [
CC-BY-SA-2.5], via Wikimedia Commons

Consumers - Protozoa

Amoeba (left) and a Radiolarian (right)

By Myself, as modification of above images [GFDL or CC-BY-SA-3.0], via Wikimedia Commons

Paramecium, a ciliated protozoan

By Barfooz at the English Wikipedia. [GFDL or CC-BY-SA-3.0], via Wikimedia Commons

Consumers - Animals

A rotifer, a tiny aquatic invertebrate

By Rkitko (Own work) [CC-BY-SA-3.0], via Wikimedia Commons

Cyclops, a tiny aquatic invertebrate

Public domain [Public Domain] via Wikimedia Commons.

An aquatic roundworm, a tiny invertebrate

Public domain [Public Domain] via Wikimedia Commons.

Daphnia, a tiny invertebrate

By (Photo: Paul Hebert) [CC-BY-2.5], via Wikimedia Commons

An ostracod, a tiny arthropod invertebrate

By Anna33 at en.wikipedia [GFDL, CC-BY-SA-3.0 or CC-BY-2.5], from Wikimedia Commons

A planarian, a tiny flatworm

By Esv - Eduard Solà Vázquez (Own work) [CC-BY-SA-3.0], via Wikimedia Commons