rivers or streams. They are also commonly found in many other moist environments.
This video was recorded with a Motic AE31 Elite Inverted Microscope with LWD objectives in brightfield and in phase contrast. It seems that a ciliate (Lepocinclis sp.) takes on food from the inside of the rotifer, instead of being eaten itself. By using an inverted microscope - as opposed to an upright microscope - life in water samples can be examined very user-friendly, because:
- Relatively large amounts of sample can be examined at one time by using Petri dishes of various sizes in combination with LWD objectives.
- By using a 35 mm imaging dish, with a standard glass bottom of 170 micron thickness, the sample can even be studied with standard objectives which have a smaller working distance but a higher numerical aperture, resulting in a higher resolution.
- The dish containing a few milliliters of sample, makes it possible that water life can be observed for an extended period of time ‘in 3D’, as the organisms are not squeezed to flat by a coverslip.