I'm glad you mentioned that. It reminded me of a biology teacher friend who
would harvest grass shrimp from the depression by an old railroad right of
way. To her surprise, when the bucket of plants, mud and glass shrimp
(plaved in an aquarium) saw the glass shrimp eventually die off, she had a
daphnia bloom!
Railroads have been responsible for preserving a number of plants and a
corridor for the spread of coyotes locally Never had thought of them as
preservers of aquatic life too!
All the best!
Scott
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