Aquatic Invertebrates |
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Invertebrates are animals without backbones. Some have hard outer shells which protect and support their soft bodies. They are the most numerous and diverse kind of animal on Earth and play a crucial role in the functioning of ecosystems. For example, invertebrates are part of the food web - on the land and in the water.
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Bristleworm:
This segmented worm is thin and reddish in colour. The segments are not visible to the unaided eye. The bristle worm can tolerate low levels of oxygen and are tolerant of pollution. Large numbers may indicate poor water quality and organic pollutants such as manure. Organic pollutants can lower the dissolved oxygen levels in water. |
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Leech:
A segmented worm, most leeches are parasitic on the blood of fish and birds while some feed on detritus. Leeches are pollutant tolerant and large numbers may indicate poor water quality. There are suckers on both ends of the body. Both can be used for attachment, but just the one is for feeding. |
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Clam:
Clams are found in slow moving, warm rivers. They are filter feeders on plankton and organic debris adrift in the current. Clams can tolerate polluted water. |
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Water mite:
Often red, water mites come to the surface for air. They feed on small animals by piercing the body and sucking up semi-digested materials. |
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Water flea:
Using their first set of antennae to move, water fleas swim with characteristic jerky movements. This is an example of the wide wariety of adaptation found in anthropods (insects). Water fleas are sensitive to pH levels. |
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Copepod:
Using their legs and antenna to propel themselves, copepods eat microscopic plants, animals and debris. |
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