1 ROCKY INTERTIDAL ZONE Western US rocky intertidal zones – less seasonal changes. The greatest limiting factor is space. Eastern US soft-bottomed intertidal.

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Presentation transcript:

1 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.

2 Rocky 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 competition for space fierce (limiting factor)

3 COPING STRATEGIES / ADAPTATIONS: - WATER LOSS: - run & hide, clam up, tolerate - allow drying out - find tide pools 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

4 COPING 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

5 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.

6 Adaptations 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. NOAA

7 New communities can then begin because one group doesn’t over populate the area. Pioneer stage - bacteria and algae Juvenile - protozoa and worms Mature - barnacles, rockweed, mussels, seastars and sea urchins Collectively these animals became known as fouling communities because of their harmful effects on ship’s hulls, docks, pilings, and the smell they create at low tide.

8 THE 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 over

9 VERTICAL ZONATION - UPPER, MIDDLE & LOWER ZONES - UPPER LIMIT SET BY PHYSICAL FACTORS - LOWER LIMIT SET BY BIOLOGICAL FACTORS (predation & competition)