rocky intertidal zone

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ROCKY INTERTIDAL ZONE. Western US rocky intertidal zones –less seasonal changes. The greatest limiting factor is space. Eastern US soft-bottomed intertidal zones - temperature changes cause seasonal population changes. The greatest limiting factor is climate. - PowerPoint PPT Presentation

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1ROCKY INTERTIDAL ZONEWestern US rocky intertidal zones less seasonal changes.The greatest limiting factor is space.Eastern US soft-bottomed intertidal zones - temperature changes cause seasonal population changes. The greatest limiting factor is climate.

12Rocky coasts are characterized by:- abundant food supply with good light- tides produce hours of flooding in cool water followed by desiccation (drying out) and high temperatures- tidal pools are created and emptied- temperature and salinity fluctuate- very distinct zonation worldwide- wave shock http://www.youtube.com/watch?v=6pZ0PZBNgU4

- competition for space fierce (limiting factor)23COPING STRATEGIES / ADAPTATIONS: WATER LOSS: run & hide, clam up, tolerate allow drying out find tide pools http://www.youtube.com/watch?v=6QaMA5S1E1E http://www.youtube.com/watch?v=IyNEG-PvZmM TEMPERATURE tolerate move to moist areas light color SALINITY clam up tolerate RESTRICTED FEEDING (MOST ARE FILTER FEEDERS) only feed when tide is high tide height determines where they can live

34COPING STRATEGIES / ADAPTATIONS: WAVE SHOCK: attach (holdfasts, byssal threads, glue) cling (suction cups) fish lack swim bladders find shelter thicker shells compact shape low profile go with the flow / flexible

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Wave action cuts rocks into sea caves, cliffs and sea stacks that provide shelter. Competition for these limited living spaces is high.Inhabitants must find a place to attach or hide or be crushed between waves and rocks.Methods of attachment include cement, byssal threads, holdfasts, muscular and tube feet, and boring.56Adaptations also include symbiosis and reproductive strategies, like hermaphrodites and organisms that change sex.The rocky coastal communities succession has a predictable pattern that is often controlled by sea urchins. Grazing urchins remove algae from rocks.

NOAA67New communities can then begin because one group doesnt over populate the area.Pioneer stage - bacteria and algaeJuvenile - protozoa and wormsMature - barnacles, rockweed, mussels, seastars and sea urchinsCollectively these animals became known as fouling communities because of their harmful effects on ships hulls, docks, pilings, and the smell they create at low tide.

78THE BATTLE FOR SPACE AVAILIBILITY OF SPACE LIMITS POPULATIONS IN INTERTIDAL COMPETITION FOR SPACE DOMINANT BIOLOGICAL FACTOR HOW TO COMPETE- be first to get to open space

- effective dispersal- reproduce rapidly- take over- grow over89VERTICAL ZONATION UPPER, MIDDLE & LOWER ZONES UPPER LIMIT SET BY PHYSICAL FACTORS LOWER LIMIT SET BY BIOLOGICAL FACTORS (predation & competition)

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