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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