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Coastal Habitats Chapter 12 Oregon Coast Field Trip
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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
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Oregon Coast Field Trip - Sat., May 30 th 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
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Required Field Trip Guide dusk.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
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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
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Oregon Rocky Intertidal Zone Oregon State Parks Guide
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Oregon Rocky Intertidal
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Spray Zone: periwinkle snails boundary between spray & intertidal rock louse & sea roaches scavenge organic debris
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High Tide Zone: filter-feed seawater / larvae are planktonic limpets, buckshot or acorn barnacles
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Oregon Limpet
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Chiton Tonicella mollusc related to sea snails, clams, limpets
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Middle Tide Zone: more variety, competition for space goose barnacles, mussel, sea stars
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Oregon Barnacles on Mussel
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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
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Oregon Sea Star Zonation
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Pisaster Sea Stars
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Henricia Sea Star
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Low Tide Zone (Tide Pools): dominated more by plants than by animals algaes, sea urchins, sea anemones
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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)
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Oregon Algaes - Fachea
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Oregon Algaes - Hallosaccion
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Oregon Algaes - Mazzaella
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Oregon Algaes - Postelsia
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Oregon Sea Urchins
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Oregon Anemone - Anthopleura
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Oregon Anemone - Corynactis
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Shore Crabs roam entire intertidal range Scavengers feeding on dead animals, seaweed
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Oregon Crab - Pugettia
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Oregon Rocky Intertidal Zone Oregon State Parks Guide
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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
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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
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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
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Clams
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Worms, Amphipods, Sand Stars
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Feeders on Sandy Shores Clams –suspension feeding Worms –deposit feeding by ingestion Amphipods –deposit feeding on surface Sand stars –carnivorous feeding on unlucky neighbors
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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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