Intertidal Zone OCS2008

The type of communities that occur in the intertidal zone are profoundly influenced by the type of ___.

Substrate

Tides were first mathematically describes by ___.

Sir Isaac Newton

Our tides are dominated by which celestial body?

Moon

A tidal pattern with one high tide and one low tide every 24 hours is called a ___ tide.

Diurnal

A tidal pattern with two high tides of similar amplitude and two low tides of similar amplitude every 24hr is termed a ___ tide.

Semidiurnal

A tidal pattern with two unequal high tides and two unequal low tides every 24hrs is termed a ___ tide.

Mixed semidiurnal

On a rocky intertidal coast, stresses and exposure would be greatest for organisms living in the ___ zone.

Upper

Stresses imposed by low tide in the rocky intertidal include ___.

Water loss, temp, salinity, inability to feed, inability to respire

Non-mobile organisms exposed to low tide must ___ the stress.

Tolerate

Mobil organisms can potentially move and therefore ___ the stress of low tide.

Avoid

Depressions, cracks, and aggregations of animals can provide a more favorable ___ to marine organims.

Microclimate

On the rocky intertidal, most organisms are ___ feeders.

Filter

The most limiting factor on rocky intertidal coast is usually ___.

Space

Vertical zonation is usually due to a combination of ___ and ___ factors.

Behavioral, physical

___ are an important keystone predator in the rocky intertidal.

Seastars

The greatest biodiversity is found at a ___ level of disturbance.

moderate or intermediate

___ factors are generally limiting in the upper rocky intertidal while ___ factors are generally limiting in the lower rocky intertidal.

physical, biological

In soft bottom intertidal communities, the presence of coarse sediments would indicate that the current above them are ___.

Strong

Fine sediments are typically rich in ___.

organic matter

Animals that disturb the sediments are termed ___.

bioturbators

In soft sediments with fine particles, ___ feeding is common.

deposit