To Each His Zone

For the article "To Each His Zone" from the July 1995 issue of Natural History magazine, answer these questions :
  1. The scientific name for the flattop crab is :
    1. Petrolisthes eriomerus
    2. Petrolisthes cinctipes
    3. Petrolisthes rickii
    4. Petrolisthes zoeae
  2. The flattop crab has mouthparts and claw spots that are :
    1. red and used in courtship
    2. blue and used in courtship
    3. porcelain and used in courtship
    4. none of these
  3. Most crabs (other than porcelain crabs) are :
    1. scavengers or predators
    2. scavengers or filter feeders
    3. primary producers
    4. none of these
  4. Which specific feeding method do porcelain crabs use ? __________________
  5. Intertidal zones can be identified by certain 'marker' organisms. By noting the location of these organisms, the naturalist can tell how long that section of beach is exposed during low tides. This article identifies marker organisms of four intertidal zones. The blue-mouth porcelain crabs stayed in the :
    1. barnacle and mussel zone
    2. brown and green algae zone
    3. barnacle and fucus zone
    4. none of these
  6. Compared to the red-mouthed crabs, the blue-mouth crabs are submerged underwater :
    1. less time
    2. same time
    3. more time
    4. none of these
  7. Exposure to air and temperature extremes is a problem for most marine organisms. You would think they'd just stay below the low tide level all the time. What reason does the author give that might force organisms to live higher on the beach and out of the water ?






  8. What was the first question the author had regarding the porcelain crabs ?
    1. how to cook them
    2. why are some red and some blue
    3. what determines the zone they live in
    4. none of these
  9. Humans have named life stages: baby, child, teenager and adult. Crabs also have named life stages :
    1. egg, zoeae, larvae, adult
    2. zoeae, megalopae, adult
    3. egg, larvae, megalopae, adult
    4. egg, zoeae, megalopae, adult
  10. When the author pitted the blue-mouth and red-mouth crabs against each other, he found the red-mouths beat up on the blue-mouths. However, in the wild the red-mouths don't invade the blue-mouth zones on the beach. While working on Vancouver Island, what other factor did he find affected where the red-mouths lived ?






  11. What unusual behaviors do porcelain crabs have that help their megalopae survive ?






  12. On a separate sheet of paper, draw a diagram of the beach experiment the author describes in the right-hand column of page 29. Use pencil, it might take a try or two to get the diagram correct. Include in your diagram:
    1. high and low tide lines
    2. the 6 rows (piles) of rock
    3. the gravel and cobble beach area
    4. the sand area of the beach
    5. where the author placed the sunken concrete blocks.
    6. where the blue-mouth and red-mouth crabs were found in the 3 control rows of rocks
    7. where the blue-mouth and red-mouth crabs were found in the 3 experimental rows of rocks (the ones with the concrete blocks).