Skjellyfetti wrote:Would populations of mussels be the best gauge to the overall effect of the oil spill? Don't mussels live burrowed in mud?
Also, what do you do for a living (if you don't mind me asking)? It will be rich with irony if you turn out to work for some government agency.

Bivalve molluscan shellfish are considered good indicators of pollution problems because they are filter feeders that live by concentrating what's in the water around them and they are stationary (or sessile if one wants to use a fancy word). That is why NOAA's Mussel Watch uses them (
http://ccma.nos.noaa.gov/about/coast/ns ... watch.html" onclick="window.open(this.href);return false;). The over arching objective of the Mussel Watch project is to monitor trends in various potentially hazardous substances over time. They monitor trends in pesticides, heavy metals. hydrocarbons, and PCBs using mussels and oysters as 'sentinel" organisms.
In an oil spill situation bivalve molluscan shellfish like oysters may be considered good indicators of what's going on because 1) they can't avoid the oil like species that can move (motile, if you want to use a fancy word) can, 2) they filter and concentrate what's in the water and 3) they can't metabolize hydrocarbons as efficiently as fish can so it takes longer for them to rid themselves of them. You can see a reference to that in the NOAA document at
http://response.restoration.noaa.gov/bo ... afood2.pdf" onclick="window.open(this.href);return false; . It's a long document but I think just by kind of skimming through it you can see how bivavle molluscan shellfish is pretty much the most "vulnerable" group.
Mussels and oysters do not live burrowed in the mud. Mussels attach to things and oysters live in clusters or reefs. If they get covered by mud they die. Clams do live burrowed into the mud but they extend siphons to draw in water and filter it. Bottom line is that the major commercial species of bivalve molluscan shellfish in the United States all live by filtering water.
I prefer not to say what I do on message boards because if I did I would not feel as free to say what I really think as I do.