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75% decline over 27 years in total flying insect biomass in protected areas

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11–20 of 454 posts

Re: 75% decline over 27 years in total flying insect biomass in protected areas

#11

I'm extremely unqualified, but is it possible that the insects just learned to avoid the specific traps used to do the measurements over time?

I was thinking the same, but its unlikely to lead to a 75% decline. The ratio of trapped insects (or insects that even get within a few meters of the traps) to total insects must be incredibly incredibly small.

Re: 75% decline over 27 years in total flying insect biomass in protected areas

#17
post #5
post #4

Presumably this is similar here in the U.S.? In the 80's and 90's the fronts of our cars would get so encrusted with mashed bugs that it would take real scrubbing to get them off. I haven't had to do that in many years.

I have heard this before. I’m not a climate change denier. Could it have anything to do with more aerodynamic car designs?

That's a good question but from my experience it's not the case. I live in France and 20 to 30 years ago, after hours driving on highways, it was quite common to have your car plastered with bugs.

Now it rarely happens.

And with the last 2 cars I've had, I know it's not an aerodynamic issue because one of my hobbies is to do track days.

I go to Michelin's wet track something like once a year and it's bugs' paradise: fields, grass all around and very humid because the track is wet so you can hydroplane easily. Bottom line is my car gets plastered there and we don't even drive that fast (something like 80/90 km/h or 50/55 mph).

Re: 75% decline over 27 years in total flying insect biomass in protected areas

#18
Edit: I see the study was conducted in Germany, but it has me wondering about the U.S. where I have (anecdotally) noticed a large decline as well.

Are there large enough areas of the country that you could control for areas that don't spray for mosquitos to see if the populations have also declined in those areas?

It wouldn't surprise me at all to find out that the spraying over the last 10 years to control the mosquito population due to the media induced West Nile panic followed by zika panic has contributed to this.

Re: 75% decline over 27 years in total flying insect biomass in protected areas

#19

Not sure, I have been wondering ( Europe) why new bugs appear that I have never noticed before. Butterflies are less also

Either due to warming (pine beetle being the poster child of that), or invasive species (Asian tiger mosquito).

Re: 75% decline over 27 years in total flying insect biomass in protected areas

#20
post #5
post #4

Presumably this is similar here in the U.S.? In the 80's and 90's the fronts of our cars would get so encrusted with mashed bugs that it would take real scrubbing to get them off. I haven't had to do that in many years.

I have heard this before. I’m not a climate change denier. Could it have anything to do with more aerodynamic car designs?

I've had similar experience with bikes on a roof rack, where there's not a significant change in aerodynamics over the time.
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