Explain why certain species of animals are used as marker for determining the oxygen levels of lakes?
Explain why certain species of animals are used as marker for determining the oxygen levels of lakes?
Explain why certain species of animals are used as marker for determining the oxygen levels of lakes (example, many leeches are found along bottoms of lakes with low levels of oxygen)
please provide reasons
2007-07-24 16:12:53 · 2 answers · asked by Anonymous in Science & Mathematics ➔ Biology
Some species can tolerate lower levels of dissolved oxygen than other species. Scientists usually study macroinvertebrates for indicators: worms, leeches, insect larvae, tiny crustaceans, and so on.
Leeches and bloodworms are examples of organisms that can tolerate lower dissolved oxygen. Stonefly larvae, mayflies, caddisflies, and dragonfly larvae are examples of organisms that need higher levels of dissolved oxygen.
2007-07-24 17:11:05 · answer #1 · answered by ecolink 7 · 1⤊ 0⤋
You usually pick ones that are easy to find so you can estiamte their population changes and that have a known sensitivity to oxygen concentrations.
2007-07-24 23:33:07 · answer #2 · answered by Rich Z 7 · 0⤊ 0⤋