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Rapidly declining insect populations threaten to collapse nature

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Rapidly declining insect populations threaten to collapse nature

Catalina Williams climate change, ecosystems, environmental issues, extinct species, extinction, insect population, insects February 13, 2019

Rapidly declining insect populations threaten to collapse nature

A global review of research looking at insect populations has led scientists to warn about worrying consequences for “the survival of mankind”.

More than 40% of insect species could become extinct in the next few decades, according to the “Worldwide decline of the entomofauna: A review of its drivers” report, published in the journal Biological Conservation.

The report tells us that insect biomass is declining by a staggering 2.5% a year, a rate that indicates widespread extinctions within a century, the report found.

In addition to the 40% at risk of dying out, a third of species are endangered — numbers that could cause the deterioration of the planet’s ecosystems with a devastating impact on life as we know it.

The report, co-authored by scientists from the universities of Sydney and Queensland and the China Academy of Agricultural Sciences, investigated dozens of existing reports on the situations of insects published over the past three decades, and examined the reasons behind this tragic falling numbers that it seems is about to produce the alarming global picture.

The lead author of the study, Francisco Sanchez-Bayo, of the School of Life and Environmental Sciences at the University of Sydney, said that this was actually the first study to ever make a thorough analysis of this issue. The focus in the past has been on the decline in vertebrate animal biodiversity, while this certain study stressed the importance of insect life on interconnected ecosystems and the food chain. Bugs make up around 70% of all animal species.

The whole planet is suffering from insect collapses

The planet is already suffering from mass extinctions, with huge losses already reported in larger animals that are easier to study. But insects are by far the most varied and abundant animals, outweighing humanity by 17 times. The important matter of the fact is that insects are “essential” for the proper functioning of all ecosystems, the researchers say, as food for other creatures, pollinators and recyclers of nutrients.

Although the falling numbers in the Insect population have recently been reported in Germany and Puerto Rico, the review suggests that the crisis is global.

The researchers warm us that unless we change our ways of producing food, insects as a whole will go down the path of extinction in a few decades and the repercussions on the planet’s ecosystems will be catastrophic to say the least, mankind having to suffer greatly as well.

The analysis, published in the journal Biological Conservation, says intensive agriculture is the main driver of the declines, particularly the heavy use of pesticides. Urbanisation and climate change are also significant factors.

“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,” the report said.

How does insect loss impact the ecosystems?

One of the biggest impacts of insect loss is on the many birds, reptiles, amphibians and fish that eat insects. “If this food source is taken away, all these animals starve to death,” he said.

The new analysis selected the 73 best studies done to date to assess the insect decline.

Butterflies, moths and bees are the ones being seriously affected. The UK has suffered the biggest recorded insect falls overall, though that is probably a result of being more intensely studied than most places.

Birds eating birds

Species that rely on insects as their food source – and the predators higher up the food chain which eat those species – are likely to suffer from these declines, according to the scientists. The pollination of both crops and wild plants would also be affected, along with nutrient cycling in the soil.

Indeed, “ecosystem services provided by wild insects have been estimated at 57 billion $ annually in the USA,” according to an earlier study.

In Australia, “birds that are running out of insect food are turning on each other,” he said, adding that this is likely a global phenomenon.

Climate change leads to insect decline

In the tropics, where industrial agriculture is often not yet present, the rising temperatures due to climate change are thought to be a significant factor in the decline. The species there have adapted to very stable conditions and have little ability to change, as seen in Puerto Rico.

Researchers say that we need to start to curb climate change, so that we can do everything possible to maintain biodiversity, get out there and plant flowers, stop using pesticides, talk to your parks department and get them to change their practices and plant habitat – if we all work together.

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