Podcast
Questions and Answers
What is the area called that lies between the highest high and the lowest low tide?
What is the area called that lies between the highest high and the lowest low tide?
Which zone is described as the beach below the mean low water?
Which zone is described as the beach below the mean low water?
What is the term for a physical or nonliving factor that shapes an ecosystem?
What is the term for a physical or nonliving factor that shapes an ecosystem?
Which area extends from above the high tide to the dunes?
Which area extends from above the high tide to the dunes?
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Where do organisms in the littoral zone undergo the greatest variations in environmental conditions?
Where do organisms in the littoral zone undergo the greatest variations in environmental conditions?
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What is the term for the biological influence on organisms within an ecosystem?
What is the term for the biological influence on organisms within an ecosystem?
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What is the main challenge for intertidal communities due to drastic fluctuations in salinity?
What is the main challenge for intertidal communities due to drastic fluctuations in salinity?
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How do sessile animals in the intertidal communities deal with extreme heats?
How do sessile animals in the intertidal communities deal with extreme heats?
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What effect does wave action have on the intertidal communities?
What effect does wave action have on the intertidal communities?
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Which factor may hasten desiccation in intertidal communities?
Which factor may hasten desiccation in intertidal communities?
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What is the main challenge for intertidal communities due to water loss (desiccation)?
What is the main challenge for intertidal communities due to water loss (desiccation)?
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How do algae in intertidal communities withstand water loss in tissues?
How do algae in intertidal communities withstand water loss in tissues?
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What is the primary mode of feeding for almost all sessile animals in intertidal communities?
What is the primary mode of feeding for almost all sessile animals in intertidal communities?
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How do mobile animals in intertidal communities respond during low tide?
How do mobile animals in intertidal communities respond during low tide?
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'Zonation' occurs due to what factor in the rocky intertidal?
'Zonation' occurs due to what factor in the rocky intertidal?
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What is the primary adaptation of Littorina (Periwinkle) to deal with extreme heats?
What is the primary adaptation of Littorina (Periwinkle) to deal with extreme heats?
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Study Notes
Intertidal Zone
- The area between the highest high tide and lowest low tide is called the intertidal zone.
Beach Zones
- The beach below the mean low water is described as the sublittoral zone.
- The area extending from above the high tide to the dunes is called the supralittoral zone.
Ecological Factors
- Abiotic factors are physical or nonliving factors that shape an ecosystem.
- Biotic factors are biological influences on organisms within an ecosystem.
Intertidal Community Challenges
- The main challenge for intertidal communities is dealing with drastic fluctuations in salinity and water loss (desiccation).
- Extreme heat is a challenge for sessile animals in intertidal communities, which they deal with by estivating or burrowing underground.
Adaptations
- Algae in intertidal communities withstand water loss in tissues by producing protective compounds and drying out slowly.
- The primary mode of feeding for almost all sessile animals in intertidal communities is filter feeding.
Behavior and Migration
- Mobile animals in intertidal communities respond during low tide by migrating to find shelter or food.
Zonation
- 'Zonation' in the rocky intertidal occurs due to the vertical gradient of environmental conditions.
Species Adaptations
- Littorina (Periwinkle) has adapted to deal with extreme heats by producing a thick shell and estivating during low tide.
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Description
Learn about the beach morphology and the three zones of intertidal communities in this lecture. Explore the subtidal, intertidal, and supratidal beach areas and their features.
