Euglena habitat

Euglena can live in fresh and salt water, however they mostly live in streams, ponds, lakes, and other small fresh water sites.

The best characteristics of a habitat for Euglena are:

• plenty of sunlight 
• rich in organic matter 

These characteristics allow for photosynthesis to occur easily.  However, if a Euglena finds itself in a unfavorable habitat, it will turn into a spore and become inactive until its surrounding conditions become better.  

Image source:

 http://upload.wikimedia.org/wikipedia/commons/d/d7/Loantaka_Brook_Reservation_bikeway_pond_with_algae.jpg