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1. Muddy thoughts
   by eworobe/cc.UManitoba.CA (Mon, 26 Oct 1998)

Muddy thoughts

by eworobe/cc.UManitoba.CA
Date: Mon, 26 Oct 1998

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.

dave.

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