Summary
Organisms live in bands from the splash zone to the low tide zone, depending on exposure and wave action.
In depth
Splash, upper, middle and lower zones are determined by tidal exposure; competition and predation limit lower boundaries, desiccation tolerance limits upper ones. Adaptations: shells that close, holdfasts, and mucus.
Vertical gradients in submergence cause sharp zones. Biotic interactions (predation by starfish) limit lower boundaries. Rock pools offer refuges.
Key idea: shores show how physical and biological factors set distributions.
On rocky shores, organisms are arranged in horizontal bands determined by tidal exposure and biological interactions. The splash zone has lichens and periwinkles; the high-tide zone has barnacles; the mid zone has mussels and limpets; the low zone has seaweeds, anemones and sea stars.
The upper limit of a species is usually set by physical stress (drying, heat), while the lower limit is often set by competition and predation. Joseph Connell's barnacle experiments and Robert Paine's removal of the sea star Pisaster, which let mussels take over, demonstrated this and the idea of keystone species.
Example: tide pools are small refuges from desiccation.
Key idea: gradients of stress create clear zones.
Frequently asked questions
What is Rocky Shore Zonation?
Organisms live in bands from the splash zone to the low tide zone, depending on exposure and wave action.
Which area of biology covers Rocky Shore Zonation, and how advanced is it?
Rocky Shore Zonation is one of the 54 topics in Marine & Environmental Biology. It is rated Beginner, so it suits learners who are starting out in biology. Related topics in this area include Marine Food Webs, Marine Symbiosis, Water Quality Indicators.
Can you give an example of Rocky Shore Zonation?
Barnacles dominate upper zones, mussels lower.
What should I learn before Rocky Shore Zonation?
Rocky Shore Zonation is a Beginner topic, so no earlier topic is required. Other Beginner topics in Marine & Environmental Biology that pair well with it include Oceans, Ocean Zones, Plankton.
What topics are related to Rocky Shore Zonation?
The closest topics to Rocky Shore Zonation are Marine Food Webs, Marine Symbiosis, Water Quality Indicators, Climate Modelling in Ecology. Comparing them side by side is a good way to see how the ideas connect.
How can I check that I understand Rocky Shore Zonation?
Read the summary and the in-depth section, then use the quick check on the interactive lesson for Rocky Shore Zonation. To practise the whole of Marine & Environmental Biology, use the Marine & Environmental Biology quiz.
How is Rocky Shore Zonation different from Marine Food Webs?
Rocky Shore Zonation: Organisms live in bands from the splash zone to the low tide zone, depending on exposure and wave action. Marine Food Webs: Phytoplankton support zooplankton, fish and top predators, with energy lost at each level. Read both side by side and note what each one explains.
How should I study Rocky Shore Zonation step by step?
First, read the summary and write the definition in your own words. Second, read the in-depth section and note any example. Third, compare it with Marine Food Webs and explain the difference aloud. Finally, take the Marine & Environmental Biology quiz and come back to this page for any question you miss.