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Re: Muddy thoughts
There are burrowing animals in aquatic muds. Perhaps one of the best
known are chironomids which can be in concentrations of tens of thousands
per square meter.
In a lake, everything comes to the substrate so the fertility of the
substrate mimics the fertility of the overlying water. Taking sediment
cores, you can date them and tell exactly when certain events occurred
due to nutrient spikes at given depths.
Nutrient concentrations are thousands of times higher in sediments than
in overlying waters. This is true for both micro and macro nutrients.