When The Bottom Falls Out of the Food Web

Single blister beetle hanging out, ready to make whoopie.

Most people might think it’s a good thing–that there are demonstrably and significantly fewer insects than there were three decades ago.

But consider that these morels are critical links between the primary producers (grasses and other greenery that turns sun into food) and the chain of upper-tier eaters that depend on insect biomass to keep their own bodies warm and populations from crashing.

Scientists have long suspected that insects are in dramatic decline, but new evidence confirms this.

Research at more than 60 protected areas in Germany suggests flying insects have declined by more than 75% over almost 30 years.
And the causes are unknown.

“This confirms what everybody’s been having as a gut feeling – the windscreen phenomenon where you squash fewer bugs as the decades go by,” said Caspar Hallmann of Radboud University in The Netherlands.

“This is the first study that looked into the total biomass of flying insects and it confirms our worries.”

I always monitor the goldenrod of September as a kind of biological clock telling me where we are on the celestial rotatation towards autumn. In particular, there is a tan blister beetle that uses this plant as a “hooking up” spot, to meet, greet, eat and procreate.

There are usually numerous pairs on every plant around the edge of the garden. This year, there were four pairs–total. I could go on with similar stories about other insects gone missing.

Turns out our canary in the cage might be an insect after all. 


About fred

Fred First holds masters degrees in Vertebrate Zoology and physical therapy, and has been a biology teacher and physical therapist by profession. He moved to southwest Virginia in 1975 and to Floyd County in 1997. He maintains a daily photo-blog, broadcasts essays on the Roanoke NPR station, and contributes regular columns for the Floyd Press and Roanoke's Star Sentinel. His two non-fiction books, Slow Road Home and his recent What We Hold in Our Hands, celebrate the riches that we possess in our families and communities, our natural bounty, social capital and Appalachian cultures old and new. He has served on the Jacksonville Center Board of Directors and is newly active in the Sustain Floyd organization. He lives in northeastern Floyd County on the headwaters of the Roanoke River.

One comment:

  1. It makes sense that these population changes apply to crawling insects as well. If this category includes spiders, I haven’t noticed a reduction in spiders in my part of the country (the Pacific North West). I have an aversion to spiders, so I keep a close watch on them! But the indicators pointing to a loss of insects should concern us all!

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