Coastal Habitats Chapter 12 Oregon Coast Field Trip.
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Coastal HabitatsChapter 12
Oregon Coast Field Trip
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 30th
dusk.geo.orst.edu/oceans/field.html Be here by 7:15 a.m. 7:30 - Busses leave
from Wilkinson lot 8:30 - HMSC Visitor
Center 10:00 - Travel to Seal
Rock State Park
10:30 - Seal Rock volcanic rocks and tide pools
12:00 - Lunch at Seal Rock (bring your own)
12:30ish - Return to Corvallis
Back by ~2:00
Required Field Trip Guidedusk.geo.orst.edu/oceans/field.html
Answers to bolded questions in guide. Please TYPE your report!!
– Turn assignment in to your TA– Due by 5:00 p.m., June 5th– 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
Oregon Rocky Intertidal Zone
Oregon State Parks Guide
Oregon Rocky Intertidal
Spray Zone:periwinkle snails boundary between spray &
intertidalrock louse & sea roaches scavenge organic debris
High Tide Zone: filter-feed seawater / larvae are planktonic limpets, buckshot or acorn barnacles
Oregon Limpet
Chiton Tonicellamollusc related to sea snails, clams, limpets
Middle Tide Zone: more variety, competition for space
goose barnacles, mussel, sea stars
Oregon Barnacles on Mussel
Fun Fact for the Day: Barnacle symbiosis
male & female attached to each other through most of life
until male reduced to size of microscopic penis
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
Exploring the Tide Pools (and associated geology)
Shoes with good tread/grip Extra socks Rubber boots, if you have them
Take your field trip guide with you!
Print out this PPT too if you like! (change “output” to black & white for best results)
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 rangeScavengers feeding on dead animals,
seaweed
Oregon Crab - Pugettia
Oregon Rocky Intertidal Zone
Oregon State Parks Guide
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 or acorn 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
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