Thursday, April 04, 2019

The Green Slime That Ate My Ponds

Not quite in the spring spirit, I was going to write about lawn blotch, but that subject was covered five years ago. Better to launch into something new and (uncomfortably) fresh--


namely, the green slime that has crept across my backyard miniponds over the past six months or so. Gone are the depths of clear water I once pondered. The visual is disturbing, recalling as it does


the images of coral reefs whose brilliant diversity has succumbed to overheating, with algae draping itself over the skeletal remains.

All the more distressing to find algae coating water in a well,

and coloring an ephemeral stream down the slope from the Veblen House.

Is this a new algae, accidentally introduced and proving invasive? Or is there something about the unusually wet weather New Jersey has been having? If this stuff covers over vernal pools, the frogs and salamanders will surely be in trouble.

It would be nice to think that this is merely a temporary aberration that will clear up and not return any time soon. A nutrient imbalance, perhaps.  One source describes how phosphorous can be released from the bottom of a pond if the water runs out of oxygen.

As scientists are wont to say, more research is needed, and please leave a comment or send an email if you've been similarly surprised this spring by similar smotherings.

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