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Stentor

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[[Image:Where Stentor lives.jpg|thumb|150px|left|Description]]
[[Image:Where Stentor lives.jpg|thumb|150px|left|Description]]
Stentor usually inhabits in freshwater, lakes and streams. These organisms don't like to swim where the lights are.
Stentor usually inhabits in freshwater, lakes and streams. These organisms don't like to swim where the lights are.
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So They prefer to inhabit dim and dark areas. To get away from light, Stentor coeruleus changes the direction of its ciliary beat to reverse the direction. However, there are some Stentors that like to inhabit in wastewater, they are even found in waste water treatment processes. But there are some exception. If bacteria population and dissolved oxygen concentration of the treatment process are higher than usual, Stentors are found in low number. They seem to prefer to inhabit in a stable environment like wasterwater and a healthy biomass. They are usually attached to algae and other detritus.
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So They prefer to inhabit dim and dark areas. To get away from light, Stentor coeruleus changes the direction of its ciliary beat to reverse the direction. However, there are some Stentors that like to inhabit in wastewater, they are even found in waste water treatment processes.[http://knowledgerush.com/kr/encyclopedia/Stentor/] But there are some exception. If bacteria population and dissolved oxygen concentration of the treatment process are higher than usual, Stentors are found in low number. They seem to prefer to inhabit in a stable environment like wasterwater and a healthy biomass. They are usually attached to algae and other detritus. And they eat bacteria and algae while they are attached to it.
[http://www.microscope-microscope.org/applications/pond-critters/protozoans/ciliphora/stentor.htm]
[http://www.microscope-microscope.org/applications/pond-critters/protozoans/ciliphora/stentor.htm]

Revision as of 04:23, 6 March 2009

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Stentor
Stentor.jpg
Scientific Classification
Species
Stentor 3.jpg

Contents

Introduction

Stentor is also known as,"trumpet animalcule", because they look like a trumpet. This is how it got its name, this word is from Greek, who had a voice that is as loud as fifty men. There are many interesting facts about this organism. Stentors are bigger than any multicellular organisms, such as rotifers and water fleas. Stentor eats the organisms that are smaller than it. Stentor is the class Spirotrichea and in the phylum Ciliophora. This creature is the easiest for microscopist to study. Because of its size. Stentor is unique from other single cell organisms in feeding, excretion, digestion, respiration and reproduction.

[1]

Anatomy

Description

Stentor can be found in ciliate measuring from 500-2000 microns, and Stentor polymorphus is 500-1500um long. Stentor coeruleus is really big trumpet shaped, and its macronucleus's color is blue and blue-green and looks like bead, the reason that it has blue color is because of stentorin. Some stentors can be in different color, and some of them can grow to millimeters in length that makes it the largest single celled organisms. Stentor is like a stalked ciliates. A main identification feature is the existence of cilia which looks like a hair-like projections, and the cilia appears on the sides of the organism. Their shape changes into bell-shaped body when they attach to the bottom of the sea or lake. They can swim freely, and change their shape into pear shaped when they swim, and it's a very good swimmer because of the cilia. This organism has incredible regenerative powers. The very small amount of an adult Stentor can grow back to a complete organism. Some of Stentors are also very colorful, there can be green, blue, and even amethyst. There are two fiber systems that can be found in the cell cortex, and they control Contraction and extension. [2]

Reproduction

Stentor uses a micronucleus for reproduction. When two Stentor were moving and meet each other, they may separate each other or mate each other. Stentors reproduce asexually through binary fission. But They can also reproduce sexually via conjugation. Micronuclei is passed on when they reproduce, and the macronuclei are made by the micronuclei. The population of Stentor goes high in autumn, because the leaves from the plants fall into the pond, and then, the population of bacteria increases in the pond to feed on the decaying vegetation. This causes an increase of bacteria population.[3]

Ecology

Stentor usually inhabits in freshwater, lakes and streams. These organisms don't like to swim where the lights are. So They prefer to inhabit dim and dark areas. To get away from light, Stentor coeruleus changes the direction of its ciliary beat to reverse the direction. However, there are some Stentors that like to inhabit in wastewater, they are even found in waste water treatment processes.[4] But there are some exception. If bacteria population and dissolved oxygen concentration of the treatment process are higher than usual, Stentors are found in low number. They seem to prefer to inhabit in a stable environment like wasterwater and a healthy biomass. They are usually attached to algae and other detritus. And they eat bacteria and algae while they are attached to it. [5]

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