Assignment Cabrillo Marine Aqua

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					                 Assignment : Cabrillo Marine Aquarium, San Pedro

Directions to the Cabrillo Marine Aquarium:

From PIERCE take the San Diego Freeway south to the Harbor (110) Freeway - San Pedro.
Continue on the Harbor Freeway south, take the Catalina exit/Harbor Blvd (towards Vincent
Thomas Bridge). Turn right at the end of of the offramp and take Harbor Blvd. all the way to 22nd
St. Turn right on 22nd and then left on Pacific Ave (second traffic light). Take Pacific Ave with
Fort Mac Arthur on your left to 36th street. Turn left onto Stephen White Drive and follow curve to
right to Cabrillo Beach. There is limited free parking along the street or pull into the lot at the
Aquarium for $6.50. Weekdays during the winter parking is (was?) free.

From Royal Palms State Beach Park turn right onto Paseo del Mar and follow along the cliffs. The
road will turn into Shepard Street at Point Fermin Park. Continue and turn left on Pacific Ave.
Follow Pacific Ave to 36th Street and turn right and follow curve to right to Cabrillo Beach. There
is limited free parking along the street or pull into the lot at the Aquarium for $6.00.

Plan at least 3 hours to complete the exercise. The aquarium is excellent and you will probably
want to spend longer and bring a friend.

                        Cabrillo Marine Aquarium: Rocky Intertidal Exercise

Visit each of the exhibits listed below, read the information provided in the text and answer the following

Rocky Intertidal Ecology

Answers to the following questions will be found by examining the following exhibits at the Cabrillo
Marine Aquarium: Shell Drillers, Predatory and Scavanger Snails, Masters of Masonry, Predators of
Plant-Like Animals, Predatory Seastars, Grazers and Browsers, Seashore Vegetarians, and Living in the

1.      Describe the feeding habits (how they feed - what is the mechanism they use to eat) of the following
        and their food (what they eat) for the following organisms.

Exhibit - Seashore Vegetarians
                                               feeding habits                          food
 Haliotis cracherodii
 (Black abalone)

 Aplysia californica
 (Sea hare)

 Megathura crenulata
 (Giant keyhole limpet)

 Astraea undosa
 (Wavy topshell)

 Norrisia norrisi
 (Norris=s welk)

Exhibit: Non-predatory Echinoderms
                                               feeding habits                          food
 Strongylocentrotus purpuratus
 (Purple sea urchin)

 Strongylocentrotus franciscanus
 (Red sea urchin)

 Ophithrix spiculata
 (Spiny brittle star)

Exhibit - Hunters on the Rocky Seashore: Diets of Seastars

                                               feeding habits                           food
 Pisaster ochraceus
 (Ochre seastar)

 Astrometris sertlifera
 (Sea star)

Exhibit - Hunters on the Rocky Seashore - Local Snails/Hunters and Scavangers

                                        feeding habits                       food
 Acanthina sp.
 (Unicorn welk )

 Conus californica
 (California Cone snail)

 Ceratostoma nuttalli
 (Nuttal=s welk)

 Kellettia kelletti
 (Kellet=s welk)

2.      Exhibit - Hiding in a Mussel Bed

        1.        How many different species of organisms may be found in one square foot of a mussel bed?

        2.        Which are the four most abundant species and approximately of each were found?

3.      Exhibit - Borers of the Rocky Shore

        Name three species of bivalves (clams) that bore into rocks and describe how they bore.




        Name one species that occupies the holes bored by these clams after they die.

4.      Exhibit - Masters of Masonry

        What types of organisms form tubes in the rocky intertidal zone - and of what materials are their
        tube made?

5.      Exhibit - Living on the Edge

        Find and describe where in the rocky intertidal zone (upper, middle or lower zone) each of the
        following species located? After doing this find as many as you can in the ALiving in the Surf@

                         Species                                      Zone
 Littorina sp. (periwinkle)

 Pachygrapsus crassipes (lined shore crab)

 Chthamalus fissus (buckshot barnacle)

 Egregia sp. (feather boa kelp)

 Mopalia muscosa (hairy chiton)

 Pagurus samuelis (hermit crab)

 Tegula sp. (Turban snail)

 Balanus glandula (acorn barnacle)

 Aplyisa californica (sea hare)

 Strongylocentrotus purpuratus (Purple sea urchin)

 Collisella scabra (rough limpet)

6.      Exhibit: Filter Feeders

       Explain how the mussel Mytilus californianus and how barnacles feed. How are they similar and
       how are they different?

7.     Exhibit - Hunters of the Rocky Seashore

       Name at least one predator of each of the following organisms:

       Polychaete worms



8.     You find a dead clam in a tidepool with the following predators: Pteropurpura, Ocenebra, and
       Pisaster. Explain how you would determine which of these animals was responsible for the death of
       the clam. (See Local Snails: Hunters and Scavangers)

Cabrillo Marine Aquarium: Wetlands Exercise

9.     Exhibit - Mudflat: Cradle of Life

This exhibit shows you where the most common wetlands aquatic plants and animals are typically
located in this habitat. Answer the following questions and complete the table below.

Describe in general the intertidal zonation scheme for the wetlands habitat.

Which species are found the highest in the zone, and which are the lowest?

What types of organisms are the following species, where in the intertidal zone are they found in which type
of microhabitat?

Species                     Type of        Intertidal   Microhabitat
                            organism       Height

Zostera marina                                          XXXXXXXXXXXXX

Lacuna sp.

Mitrella sp.
Urechis caupo

Spartina foliosa

Chaetopteris variopedatus

Hemigrapsus nudus
Clevlandia ios

Conus californica
Cerrithedia californica

Tresus nuttalli

Upogebia sp.

Salicornia sp.

10.       Exhibit - The Feasting Flocks

This exhibit about sea birds depicts the most of the common species you will see in southern California
and northern Baja California wetlands. Look at all of the birds and read the information supplied for
each of them. After thoroughly examining the exhibit fill in the table below.

What are the feeding methods employed by the following species of birds and on what do they prey?

 Bird Species                             Feeding Method               Prey Items
 California Gull
 Caspian Tern
 Clapper Rail
 Ruddy Duck
 Heerman=s Gull
 Great Blue Heron

11.       Exhibit - Buried Alive

Infaunal species are those that live within the sediments in tubes, burrows or tunnels. In this exhibit
there are several different infaunal bivalves (clams) species are represented along with explanations of
the way in which they live within the sediments.

Define infaunal.

Why do you suppose the majority of bottom (benthic) organisms are infaunal?

12.       Exhibit - Using the Right Tool

How do the feet and beaks of shore birds differ?



13.    Exhibit - Buried Alive

For each species listed below describe where in the mud they live (deep, shallow, etc), and the adaptations
mentioned in the exhibit that they possess for living an infaunal existence.

 Clam Species              Adaptations






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