A paper has been published, which highlights the worrying worldwide decline of insects.
paper, Worldwide decline of the entomofauna: A review of its drivers (1) by Francisco
Sánchez-Bayo and Kris A.G. Wyckhuys, presents a thorough review of 73
historical reports of insect declines from across the globe, and systematically
assesses the underlying drivers.
abundance of a small number of species is increasing. These are adaptable, generalist species that
are occupying the vacant niches left by the ones declining.
main drivers of species declines listed in order of importance:
These drivers are of course, well known and established, but action needs to be taken to make a meaningful difference as quickly as possible.
The paper proposes:
“A rethinking of current agricultural practices, in particular a serious reduction in pesticide usage and its substitution with more sustainable, ecologically-based practices, is urgently needed to slow or reverse current trends, allow the recovery of declining insect populations and safeguard the vital ecosystem services they provide. In addition, effective remediation technologies should be applied to clean polluted waters in both agricultural and urban environments.”
tandem with global insect decline, birds have also been declining, especially those of
farmland habitats. The increased use
and efficacy of pesticides leads to the loss of insect food and wildflower
and weed seeds. Many small farmland
birds feed their young chicks on insects in the spring and summer months, whilst the
developed adults eat mainly seeds.
2013, Bird Life International wrote:
analysis of 148 of Europe’s common birds has revealed that, over a 30-year
period, 57 species (39%) have declined across 25 European countries. Farmland birds have fared particularly badly,
with 300 million fewer birds today than in 1980. These population trends of representative
suites of wild birds can indicate the health of the environment, for birds and
comparison of new and old EU Member States shows that although farmland birds
were performing better in new EU countries, their trends appear to be worsening
in recent years, now mimicking the trends in old EU countries. It is widely
accepted that these declines have been driven by agricultural intensification
and the resulting deterioration of farmland habitats, and it is likely that the
trends observed are mirrored by other farmland taxa.” (2)
They also state:
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