Animals of the Benthos
 98% of marine species are benthic
 Hydrothermal vents
 Coral reefs
 Rocky shore
 Sandy shore
 Oregon info at the Oregon Coastal Atlas
– www.coastalatlas.net

Oregon Coast Field Trip -
Sat., May 21 st 2011 dusk.geo.orst.edu/oceans/field.html
 Be here by 7:15 a.m.
 7:30 - Busses leave from
Wilkinson lot
 10:00 - Seal Rock volcanic rocks and tide pools
 11:30 - Lunch at Seal
Rock (bring your own; eat lunch in busses if weather is bad )
 12 noon - Travel to
HMSC
 12:30 - HMSC Visitor
Center
 2:00 ish - Return to
Corvallis
 Back by ~4:30 p.m.

Exploring the Tide Pools
(and associated geology)
 Shoes with good tread/grip
 Extra socks
 Rubber boots, if you have them
 Pillow/stuffed animal
 Take your field trip guide with you!
 Be prepared with questions!!!

Required Field Trip Guide dusk.geo.orst.edu/oceans/field.html
 Answers to bolded questions in guide
– Turn assignment in to your TA
– Due by 5:00 p.m., June 3rd
– This constitutes LAB 9

Rocky Shores
 spray zone
– mostly dry, covered by water only during storms
 high tide zone
– fairly dry, covered only by the highest high tide
 middle tide zone
– equally exposed & covered during all high & low tides
 low tide zone
– mostly wet

The Rocky Shore

Oregon Rocky Shore

Spray Zone: periwinkle snails boundary between spray & intertidal rock louse & sea roaches scavenge organic debris

High Tide Zone: filter-feed seawater / larvae are planktonic limpets, buckshot barnacles

Oregon Limpet

Chiton Tonicella mollusc related to sea snails, clams, limpets

Middle Tide Zone: more variety, competition for space goose barnacles, mussel, sea stars

Oregon Barnacles on Mussel

Oregon Sea Star Zonation

Pisaster Sea Stars

Henricia Sea Star

Low Tide Zone (Tide Pools): dominated more by plants than by animals algaes, sea urchins, sea anemones

Oregon Algaes Fachea

Oregon Algaes Hallosaccion

Oregon Algaes Mazzaella

Oregon Algaes Postelsia

Oregon Sea Urchins

Oregon Anemone Anthopleura

Oregon Anemone Corynactis

Shore Crabs roam entire intertidal range
Scavengers feeding on dead animals, seaweed

Oregon Crab Pugettia

Animals of the Rocky Shores
 spray zone
– mostly dry, covered by water only during storms
– periwinkle snail
– rock louse
 high tide zone
– fairly dry, covered only by the highest high tide
– buckshot barnacles
– limpets

Rocky Shores cont.
 middle tide zone
– equally exposed & covered during all high & low tides
– more variety, competition for space
– goose barnacle, mussel, sea star
– sea anemone, hermit crabs, sea urchins (tidal pools)
 low tide zone
– mostly wet
– surf grass, algae, seaweeds,
– sea urchins, sea anemones

Sandy Shores
 no fixed surface to attach to
 different adaptations protect animals from fluctuations in
– temperature
– salinity
– water levels (so as not to dry out)
 clams, worms, sand stars, amphipods

Clams

Worms, Amphipods, Sand Stars

Feeders on Sandy Shores
 Clams
– suspension feeding
 Worms
– deposit feeding by ingestion
 Amphipods
– deposit feeding on surface
 Sand stars
– carnivorous feeding on unlucky neighbors

Important Web Sites
 Field Trip Page and Guide
– dusk.geo.orst.edu/oceans/field.html
– dusk.geo.orst.edu/oceans/OC103FieldTrip.pdf
 Oregon Coastal Atlas
– www.coastalatlas.net
 HMSC Summer Experiences
– hmsc.oregonstate.edu/summer.html

Maybe we’ll see a little guy like this in the woods near the parking lot!
One of the bus drivers took this photo there in 2006!

Oregon Coast Field Trip -
Sat., May 21 st 2011 dusk.geo.orst.edu/oceans/field.html
 Be here by 7:15 a.m.
 7:30 - Busses leave from
Wilkinson lot
 10:00 - Seal Rock volcanic rocks and tide pools
 11:30 - Lunch at Seal
Rock (bring your own; eat lunch in busses if weather is bad )
 12 noon - Travel to
HMSC
 12:30 - HMSC Visitor
Center
 2:00 ish - Return to
Corvallis
 Back by ~4:30 p.m.