Intertidal Zones

What are the types of communities that occur in the intertidal zone profoundly influenced by?

type of substrate

Tides were first mathematically described by who?

Sir Issac Newton

Our tides are dominated by which celestial body?

Moon, due to the proximity of it to the Earth compared to the sun

What is the tide called when the pattern has one high tide and one low tide every 24 hrs?

Diurnal Tides

What type of tide has two high tides of similar amplitude and two low tides of similar amplitude every 24hrs?

semidiurnal tide

What type of tide has a pattern with two unequal high tides and two unequal low tides every 24 hrs?

Mixed or mixed semidiurnal tide

On rocky intertidal coast, stresses and exposure would be greatest for organisms living where?

upper zone

What are some stressors that are imposed on low tide in the rocky intertidal?

water loss, temperature, salinity, inability to feed, and inability to respire

What type of organisms must tolerate the stress of low tide exposure?

non-mobile organisms

What type of organisms have the ability to avoid low tide exposure?

mobile organisms

What provides a more favorable microclimate to marine organisms?

depressions, cracks, and aggregations

What type of feeders are organisms on rocky intertidal zone?

filter feeders

What is the most limiting factor in the intertidal coasts?

space

What usually causes vertical zonation to occur?

behavioral and physical factors

What organisms is an important keystone predator in rocky intertidal?

sea stars

Where is the greatest diversity found?

intermediate or moderate level of disturbance

In the upper tidal what is the limiting factor? In the rocky intertidal what is the limiting factors?

physical; biological

In intertidal communities, what does the presence of coarse sediments indicate?

strong currents above them

What type of sediment is rich in organic matter?

fine sediments

An animals who disturbs the sediments is known as?

bioturbators

What type of feeding is common in soft sediments w/ fine particles?

deposit feeders