Warmer water<br />
PH rise<br />
Not sure about 4 but one of the biggest causes around here is Drag net fishing. Cheers!
go do your own homework
Ocean acidity rising due to more carbon in atmosphere<br />
Fishing with large nets-"bottom trawling" is what I think it's called...<br />
Ozone la<x>yer depletion<br />
Pollution in oceans<br />
...I think there's others...<br />
...Yanno, I have a feeling the OP needs to take better notes in class.
Invasive algae. <br />
Silting from runoff.<br />
Cyanobacteria / fungi. <br />
Humans, humans, humans, and humans oh did I forget to say HUMANS !!
temp, toxins, humans, salinity ?.. shooting from the hip here :)
Some fishermen use Dynamite to fish, but then there is a type of sea snail that does terrible damage to coral reefs.
Are your contributors helping you write a paper for an ecology class? Lol.