1 of 25 The lower limit of the intertidal zone is the average high tide. average middle tide. lowest tide. lowest edge of the rocky substrate. None of the above choices are correct: it varies according to type of substrate. 2 of 25 The particular characteristic most widely used in classifying intertidal communities is which of the following? Type of tides Relative exposure to air Type of substrate Type of seaweeds Relative immersion by water 3 of 25 Which of the following strategies is not used to avoid desiccation in the intertidal? Closing shells Crowding in areas that are always moist Burrowing into substrate Mucus Moving out of tide pools 4 of 25 Most sessile animals living on rocky shores are which of the following? Deposit feeders Carnivores Detritus feeders Filter feeders Grazers 5 of 25 If a rocky shore highly exposed to wave action is compared to a similar rocky shore that is a lot less exposed to wave action one should expect that barnacles living on the more exposed shore show a wider vertical distribution. narrower tolerance to salinity. narrower tolerance to temperature. narrower vertical distribution. higher resistance to predators. 6 of 25 Byssal threads are used by mussels to cope with. desiccation. wave shock. restricted feeding. salinity changes. temperature changes. 7 of 25 Vertical zonation on rocky shores is mostly the result of differences in tolerance to wave action. exposure. predation. light. salinity. 8 of 25 This organism is typical of the upper intertidal on rocky shores. Mussels Barnacles Sponges Sea anemones Periwinkles 9 of 25 The middle intertidal is characterized by which of the following? Constant wetting by splash and spray Long exposure to air Steady immersion Exposure and immersion on a regular basis Splashing during high tide and complete exposure at low tide 10 of 25 Intertidal organisms from exposed areas sometimes have thicker shells than their counterparts from less exposed areas. This is thought to be an adaptation to desiccation. restricted feeding. wave shock. salinity changes. temperature changes. 11 of 25 Predation by sea stars on rocky shores ultimately results in fewer species. less wave action. a decrease in the number of seaweeds. an increase in the number of mussels. more species. 12 of 25 Ecological succession ultimately results in a climax community. an upper-limit stage. competitive exclusion. keystone predation. vertical zonation. 13 of 25 Which of the following is generally considered to be the greatest limiting resource in the rocky intertidal? Salinity Space Prey Availability of mates Light availability 14 of 25 Which of these organisms is typically a very rare component of soft-bottom intertidal communities? Burrowing organisms Detritus feeders Seaweeds Infauna Deposit feeders 15 of 25 Most animals living on sandy beaches are included among which of the following? Infauna Deposit feeders Macrofauna Producers Grazers 16 of 25 Fine sediments are characteristic of shores exposed to wave action. rocky shores. areas with wide temperature fluctuations. calm less exposed shores. areas that experience considerable water flow. 17 of 25 The interstitial water in muddy bottoms has plenty of oxygen since temperature is much higher than in the water column. accumulates oxygen as a result of photosynthesis by inhabitants of the sediment. recirculates oxygen very frequently so it is high. is deficient in oxygen. is deficient in oxygen but only during the day. 18 of 25 The main source of food in muddy-bottom intertidal communities is seaweeds detritus plankton large prey epifauna 19 of 25 On Atlantic shores the dog whelk (Nucella lapillus) has two color forms: white-shelled and brown-shelled. Survival of one form over the other form in a region appears to be related to temperature. salinity. substrate type. prey availability. predators. 20 of 25 What organism would be most likely to be found in the upper intertidal zone of a rocky shoreline? Mussels Seaweed Encrusting algae Barnacles Irish moss 21 of 25 In soft-bottomed intertidal communities locations with strong waves and currents are most likely to have which type of bottom? Gravel Sand Silt Clay Mud 22 of 25 Meiofauna live on rocky shores. on sandy bottoms. between grains of sediment. in burrows. in the water column. 23 of 25 A species that significantly influences the structure and diversity of its community is a ______________. predator species keystone species prey animal primary producer apex predator 24 of 25 The best reason for putting a cage over certain organisms in an intertidal study area is so that __________________. other organisms can be kept out of the study area biologists can control when certain animals mate their respiration rates can be measured they can be removed from the area body measurements can be taken 25 of 25 Two sediments that are very rich in detritus are ______________. sand and gravel sand and clay silt and gravel clay and sand silt and clay
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