by Heather Soulen,
biological technician at the Smithsonian Environmental Research Center
Imagine if you will, you arrive at a party and proudly parade your famous 7-layer dip over to the food table and with a satisfying smile, place your gastronomic masterpiece front and center as onlookers gaze through the glass at its layered awesomeness. You hardly finish removing the lid when suddenly someone swoops in with a tortilla chip, then another person, and then another and another. You back away from the table as you begin to feel a primeval and Velociraptor-like need to eviscerate these culinary offenders. Minutes later, the ravenous horde thins and the feeding frenzy slowly dissipates. You look back at the food table and what do you see? Nothing but a grotesque slurry of beige-brown with smeared, thin trails of sour cream, salsa and guacamole. It is a pale, unrecognizable shadow of its former layered glory.
Walking around a tidal marsh can have the same effect as dragging a tortilla chip through layered dip. Walking often destroys marsh layers or the physical landscape of a marsh, creating serious problems for scientists studying the ecology and biogeochemistry of marsh systems. Click to continue »