36. The most common zooplankton in local lakes include a. dinoflagellates, Chaob

Question

36. The most common zooplankton in local lakes include

a. dinoflagellates, Chaoborus, and copepods

b. turbellarians, copepods, and cladocerans

c. cladocerans, Cnidarians, and rotifers

d. rotifers, cladocerans, and copepods

e. all of the above

37. True or False. Chaoborus larvae complete diel migrations by buoyancy modification

a. True b. False

38. True or False. Chaoborus larvae complete diel migrations by actively swimming through the water.

a. True b. False

39. As a Chaoborus migrates nocturnally and upward vertically from deep in a stratified lake, it experiences

a. increasing pressure, temperature, and light intensity

b. increasing predator pressure, increasing dissolved oxygen, and increasing light intensity

c. increases of temperature, light intensity, and pH

d. decreasing pressure, increasing temperature, no change of light intensity and increasing dissolved oxygen

e. none of the above

40. True or False. Zebra mussels are unlikely to invade Lake Hartwell due to low calcium concentrations and warm temperatures.

a. True b. False

Explanation / Answer

36. Option e is correct.

Animals of fresh waters are extremely diverse, and include representatives of nearly all phyla. The zooplankton include animals suspended in water with limited powers of locomotion. Like phytoplankton, they are usually denser than water, and constantly sink by gravity to lower depths. The distinction between suspended zooplankton having limited powers of locomotion, and animals capable of swimming independently of turbulence-the latter referred to as nekton- is often diffuse. Freshwater zooplankton are dominated by four major groups of animals: protozoa, rotifers, and two subclasses of the Crustacea, the cladocerans and copepods. The planktonic protozoa have limited locomotion, but the rotifers, cladoceran and copepod microcrustaceans, and certain immature insect larvae often move extensively in quiescent water. Many pelagial protozoa (5-300 µm) are meroplanktonic, in that only a portion, usually in the summer, of their life cycle is planktonic.

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