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Carolina Wetlands Association

5 hours ago

Fascinating!Eye see you! Have you ever looked close up at the eyes of a dragonfly? I photographed this Widow Skimmer (Libellula luctuosa) recently along a pond and it stayed still long enough for me to get an image of its compound eyes. They’re called compound eyes because they contain many (up to 30,000 in some dragonflies!) individual visual units called ommatidia. On the surface of each compound eye, you can see the round end of each tubular ommatidium. This round area is a transparent thickening of cuticle called the corneal lens. It helps focus light onto light-sensitive pigments deep within the ommatidium. Humans have three different color-sensitive proteins within our eyes for red, green, and blue light. Recent research has found that some dragonflies have as many as 30 different color-sensitive proteins, meaning they likely have better color discrimination than us, as well as the ability to see UV and polarized light reflected off water.Contrary to what you might see depicted by Hollywood, dragonflies and other insects do not see thousands of copies of the same image with their compound eyes. Rather, each ommatidium detects a small part of the overall visual field and a single complete image is formed as a mosaic from the overlapping visual field of each ommatidium. Compound eyes allow dragonflies and other insects to have a broad visual field (dragonflies can see all around, even behind!) and track movement extremely well as objects pass between the visual field of different ommatidia. See the comments for an even closer view of this dragonfly’s compound eyes. ...

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Virginia Holman

2 days ago

“When federal permitting fails to safeguard wetlands, taxpayers are left to engineer stormwater management remedies to protect downstream neighborhoods.These efforts are expensive and not nearly as effective as the wetlands they are replacing. Both the Corps and the state need to reconsider criteria for issuing permits to fill wetlands and begin to look at best practices that have been implemented in other areas of the country.” Biohabitats President and Founder, Keith Bowers, FASLA, RLA, PWS Hat tip to Rick Savage at Carolina Wetlands Association for making me aware of this letter. ...

Letters: Don’t fill in wetlands for developments

www.postandcourier.com

Our Post and Courier readers write about filling in wetlands, climate change and finding a job.

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