“Scientists cite many factors in the fall-off of the world’s insect populations, but chief among them are the ubiquitous use of pesticides, the spread of monoculture crops such as corn and soybeans, urbanization, and habitat destruction.
A significant drop in insect populations could have far-reaching consequences for the natural world and for humans, who depend on bees and other invertebrates to pollinate crops. A study by Canadian biologists, published in 2010, suggests that North American bird species that depend on aerial insects for feeding themselves and their offspring have suffered much more pronounced declines in recent years than other perching birds that largely feed on seeds. The analysis is based on data from the North American Breeding Bird Survey. The decline in birds that feed on flying insects appears to be significantly stronger than in perching birds in general, according to co-author Silke Nebel, now with the Upper Thames River Conservation Authority in Ontario.”
On Jul 25, 2020, 4:37 PM -0400, Cliff Otto <bye.bye.nh.birdy...>, wrote:
> With respect to the insect population declining about 27% in the last
> 30 years, the bird population in North America has declined about 30%
> in the last 50 years.
> Are there fewer insects because there are fewer birds eating them or
> are there fewer birds because there aren't as many insects to eat? Or
> is it just climate change?
> Clifford Otto
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