Slide 1
A pool between two worlds
A tide pool holds seawater after the tide retreats. Its inhabitants face both daily sunlight changes and the rhythm of tidal flooding.
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A shallow pool can warm or become saltier as water evaporates. Rain can dilute it, so the conditions between high tides differ from those in continuously submerged water.
Slide 2
Clinging against the waves
Limpets and other shore animals hold tightly to rock. Attachment helps them remain in place when breaking waves return.
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A low profile can reduce exposure to moving water. Cracks and sheltered surfaces also matter, meaning an animal's position on a rock can influence the forces it experiences.
Slide 3
Closing the door
Some intertidal animals close shells or draw in exposed tissues when water falls. These behaviours reduce exposure during the uncovered period.
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Closing up can also interrupt feeding. Survival on the shore involves balancing time protected from drying with opportunities to collect food when water covers the habitat again.
Slide 4
A shore has living bands
Different organisms occupy different heights on a rocky shore. Higher zones usually spend longer exposed to air between tides.
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Competition and predation also shape those boundaries. The highest place an organism tolerates physically is not always the place where it can thrive beside other species.
Slide 5
A small pool is connected
Tide pools appear separate at low water, but the returning sea reconnects them. Water movement brings food and carries young organisms.
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A pool is therefore not a closed aquarium. Its community depends on exchanges with the wider shore, even when a quiet low-tide visit makes it look self-contained.
Sources
- Tidepooling at Point Reyes
National Park Service
- Tidepool Animals
National Park Service