Lecture 10

what type of coral is the reef building kind?
hermatypic coral is reef-building coral
coral reefs consist of what two organisms?
coral reefs consist of heterotrophic polyps and autrophic algae
how do coral reefs react to changing coniditions?
polyps react to changing conditions by bleaching, which means ejecting thier algae and then taking in new algae that is better suited to the new environment
where are most coral reefs found?
most coral reefs are found in areas near the equator on the west side of land masses. The west side of land masses is where the warm water gets pushed by global currents
draw a diagram that includes fringe reefs, platform reefs, and barriers reefs
[image]
fringe reefs are found where?
fringe reefs are found next to mainland or on high islands
what kinds of reef have no continental sediment?
platform reefs, barrier reefs, and atolls have no continental sediment
how do atolls form?

this is how atolls form

We Will Write a Custom Essay Specifically
For You For Only $13.90/page!


order now

1st a volcanic island is made by a moving volcanic hotspot 

2nd the volcanic island gets a ring-shaped fringe reef around it. 

3rd the hotspot moves on, and with nothing to keep feeding it, the heavy volcano starts to sink. The reef sinks too, but grows vertically to near surface. 

what is the coral reef response to destructive storms?
after destructive storms, the coral gets stripped off and then has to regrow
what is the main threat to reef crests? how does the morphology of reef crests reflect this threat?
the biggest threat to reef crests is high wave energy. The reef crests evolve to not branch out, to stay consalidated so that waves don’t wash them away
what is the biggest threat to reef fronts? how does thier morphology reflect this?
Reef fronts are deeper underwater, and get less light. Thus, they evolved to branch out to increase surface area and get more light for photosynthesis.
on what part of the reef profile is wave energy focussed?
wave energy is focussed on the reef crest
sediment cores from reefs often seeing mixing from this process that goes beyond the typical beach process perspective
sediment cores from reefs are often subject to bioturbation, a process beyond the scope of the typical beach process perspective
these two processes can detach coral from the ground

these two processes can detach coral from the ground

1. storms 

2. bivalves 

draw the reef platform sediment system
[image]
describe internal reef structure
the structure of reefs is a porousm, holey skeleton
what occurs when freshwater dissolved CaCO3 on the beach, and then the CaCO3 cements the sand together?
when freshwater dissolves CaCO3 and then the CaCO3 acts as cement and fuses the sand together, you get beachrock
what is beachrock?
beachrock is when freshwater dissolves CaCO3 on the beach, and then the CaCO3 fuses together the sand
what are island storm deposits?
island storm deposists are piles of poorly sorted sediment on the back ends of beaches
what does a pile of poorly sorted sediment on the back end of a beach indicate?
a pile of poorly sorted sediment on the back end of a beach indicates that a strong storm pushed the sediment there. it’s called and island storm deposit
what do we call a pile of dead coral pushed high on to shore by storms?
basset edges are piles of dead coral pushed high up on the shore by storms
what are basset edges?
basset edges are piles of dead coral pushed high up on the shore by waves
what are the corals we use for looking at past sea level called?
the corals used for examing paleo sea levels are called microatolls
crown of thorns
crown of thorns are a type of starfish that negatively impact coral reefs. Outbreak of crown of thorns has gotten worse as global temperatures rise, and will continue getting worse
what is the name of the clam that Deirdre’s PhD student studied?
Deirdre’s grad student looked at Tuatua clams
which is worse for Tuatua, horses or cars?
horses are worse for Tuatua than cars