A lot of emphasis is placed on the importance of vernal pools in the life cycles of amphibians, who spend part of their lives in these habitats. The fairy shrimp spends its entire life in the pool. How much do you know about these crustaceans?
1. As a rule, which are more numerous in a vernal pool?
A. Male fairy shrimp
B. Female fairy shrimp
C. Males and Females are found in almost equal numbers.
2. Usually, fairy shrimp are reddish orange. Sometimes, though, they are blue, green, gray or white. What determines a fairy shrimp's color?
A. Their diet
B. Amount of sunlight reaching the bottom of the pool
C. Amount of oxygen in the water
D. Water temperature
3. Fairy shrimp mate, lay eggs, then die as the pool dries up. The eggs remain in the dry bed over the winter and hatch when spring waters return. About how many hours after rain fills the pool will the eggs hatch?
A. 15 hours
B. 24 hours
C. 30 hours
D. 42 hours
4. The fairy shrimp sometimes lays "summer" eggs. Which of these is true about summer eggs?
A. They have thinner shells than winter eggs.
B. They hatch the season they are laid.
C. They are laid when there is a shortage of males in the pool
D. All of the above
5. The fairy shrimp has a pair of stalked, compound eyes on the sides of its head and a "nauplial" eye on top of its head. What does nauplial refer to?
A. The ability of the eye to sense movement
B. That eye's blindness
C. The eye is part of a crustacean's first stage of development after leaving the egg.
D. It is not a compound eye.