Biology 432 - University of Washington



Biology 432 Summer 2004

Marine Invertebrate Zoology Team Cobble

Cobble Beach at Snug Harbor

“I’m sorry but my rock does not look like any of those. I’ve seen those kinds of rocks before and mine doesn’t look anything like it”

Department of Earth and Planetary Sciences, University of Washington, St. Louis

A pile of rocks ceases to be a rock when somebody contemplates it with the idea of a cathedral in mind.

Antoine de Saint-Exupery

Major THEMES

Tidal zonation

Effects of wave disturbance

The importance of rock size

Hemigrapsus, patron saint of Cobble Beach

Hemi-g, patron clarinetist of Cobble Beach

TOP TEN LIST of important concepts at Cobble Beach

10. Three-dimensional structuring of the environment by cobble

9. Harsh physical conditions and how they are ameliorated by cobble

8. Life on top of and under large cobble

7. Life deeper in sediment below cobble

6. Different scales of locomotion

5. Unique species at Cobble Beach (vs. Eagle Cove and Garrison Bay)

4. How predation affects zonation, particularly between shore crabs

3. Temperature variation

2. Desiccation

1. The heartbreak of rocks that can’t be turned over (or moved)

COBBLE BEACH

OBSERVED SPECIES LIST

 

Mollusca

Limpets

Lottia digitalis

Lottia scutum

Lottia pelta

Notoacmaea persona

Puncturella sp.

Diodora aspera

Barnacles

Semibalanus sp.

Balanus

Chthamalus

 

Snails

Littorina scutulata

Littorina sitkana

Margarities

Nucella lamellosa

Ocenebra lurida

Lacuna sp.

Amphissa sp.

Calliostoma sp.

Ocenebra lurida

 

 

Arthropoda

Decapods

Hemigrapsus nudus

Hemigrapsus oregonensis

Pachygrapsus sp.

Lophopanopeus bellus

Hapalogaster mertensii

Cancer productus

Cancer oregonensis

Petrolisthes sp.

Hermit crab (in shells)

Hermit crab (in tubes)

Pugettia sp. (kelp)

Oregonia gracilis (decorator)

 

Isopods

 

Amphipods

 

 

Platyhelminthes

Notoplana

 

 

Brachiopoda

Terebratalia transversa

 

 

Annelida

Spirorbidae

Serpulidae

Polynoidae

Sabellariidae

Nereidae

Sabellidae

Terebellidae

Phyllodocidae

Glyceridae

Hesionidae

Opheliadae

 

 

Sipuncula

Phascolosoma sp.

 

 

Echinodermata

Seastars

Henricia sp. A

Henricia sp. B (small brooder)

Evasterias sp.

Leptasterias hexactis

Pycnopodia sp.

 

Brittle stars

Ophiopholis aculaeata

Amphipholis squamata

 

Sea urchin

Strongylocentrotus droebachiensis

 

Sea cucumbers

Cucumaria sp. (red)

Parastichopus sp.

Eupantacta quinquesmita

 

 

Bryozoa (colonies)

Encrusting

Erect

Schizoporella

Bugula

Membranipora

Dendrobeania lichenoides

Heteropora magna

 

 

Porifera

Ophlitaspongia pennata

Halichondria sp.

Cliona celata

yellow flat

tan slimy

red encrusting

pink hairy

brown encrusting

 

 

Cnidaria

red anemone

little white anemones

Allopora

Anthopleura elegantissima

 

 

Urochordata

Solitary

Colonial

Boltenia villosa (Solitary)

Metandrocarpa taylori

 

| |Tidal Zonation: This chart is designed to be used either for broad-scale (e.g., limpets vs. barnacles) or finer scale (species-level) identification of organisms that are |

| |present/absent or abundant/rare in each zone of the intertidal. Zone 1 is closest to the water. For each taxon, put a vertical bar on your table that corresponds to where you find it |

| |– when you are finished you should have a great ‘picture’ of the zonation on Cobble Beach! For reference, check the species list. |

5 | | | | | | | | | | | |

4 | | | | | | | | | | | |

3 | | | | | | | | | | | |

2 | | | | | | | | | | | |

1 | | | | | | | | | | | |ZONE |Leptasterias

Henricia

Other: |Lottia spp.

Notoacmaea

Other: |Littorina spp.

Nucella spp.

Other: |Spirorbidae

Terebellidae

Other: |Hemigrapsus

Petrolisthes

Hermit crabs

Other: |Semibalanus

Balanus

Chthamalus |Encrusting

Erect |Ophlitaspongia

Halichondria

Other: |Green

Brown/Red | | | |Echinoderms |Limpets |Snails |Polychaetes |Crabs |Barnacles |Bryo-zoans |Sponges |Algae |Other | |

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