Commentary: Killer heat waves are killing off insect species

Commentary: Killer heat waves are killing off insect species

The natural world depends on insects to function, but they may be the next casualty of climate change, says Professor Bill Laurance from James Cook University.

A monarch butterfly.
A monarch butterfly. (Photo: Unsplash)

QUEENSLAND: Climate change gets blamed for a lot of things these days - inundating small islands, fueling catastrophic fires, amping-up hurricanes and smashing Arctic sea ice.

But a global review of insect research has found another casualty: 40 per cent of insect species are declining and a third are endangered.

It confirms what many have been suspecting: Around the world, arthropods – which include insects, spiders, centipedes and the like — appear to be in trouble.

The global review comes hard on the heels of research published in the Proceedings of the National Academy of Sciences that suggests a potent link between intensifying heat waves and stunning declines in the abundance of arthropods.

If that study’s findings are broadly valid – something still far from certain – it has chilling implications for global biodiversity.

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ARTHROPOD ARMAGEDDON

In the mid-1970s, researchers on the Caribbean island of Puerto Rico conducted a large-scale study to measure the total biomass (living mass) of insects and other arthropods in the island’s intact rainforests, using sweep nets and sticky traps.

Four decades later, another research team returned to the island and repeated the study using identical methods and the same locations. To their surprise, they found that arthropod biomass was just one-eighth to one-sixtieth of that in the 1970s – a shocking collapse overall.

And the carnage didn’t end there. The team found that a bevy of arthropod-eating lizards, birds and frogs had fallen sharply in abundance as well.

A southern corroboree frog is seen in the Australian bush. Half of all threatened fish receive no
A southern corroboree frog is seen in the Australian bush. Half of all threatened fish receive no monitoring and tracking reptiles was little better. (Photo: AFP/ADAM PARSONS)

In the minds of many ecologists, a widespread collapse of arthropods could be downright apocalyptic. Arthropods pollinate some of our most important food crops and thousands of wild plant species, disperse seeds, recycle nutrients and form key links in food chains that sustain entire webs of life.

This ecological ubiquity arises because arthropods are so abundant and diverse, comprising at least two-thirds of all known species on Earth. In the 1940s, evolutionary biologist J B S Haldane quipped that “God has an inordinate fondness for beetles.”

Humans might think we rule the world, but the planet really belongs to arthropods.

KILLER HEAT WAVES

The researchers who documented the arthropod collapse in Puerto Rico considered a variety of possible causes, including pesticides and habitat disruption.

But the evidence kept pointing to another driver: Rising temperatures.

Weather stations in Puerto Rico indicate that temperatures there have risen progressively in the past several decades – by 2 degrees Celsius on average.

But the researchers are far less worried about a gradual increase in temperature than the intensification of heat waves—which have risen markedly in Puerto Rico. This is because nearly all living species have thresholds of temperature tolerance.

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For example, research in Australia has shown that at 41 degrees Celsius, flying foxes become badly heat-stressed, struggling to find shade and flapping their wings desperately to stay cool.

But nudge the thermometer up just one more degree, to 42 degrees Celsius and the bats suddenly die.

In November, heat waves that peaked above 42 degrees Celsius in Australia’s North Queensland killed off almost a third of the region’s spectacled flying foxes. The ground beneath bat colonies was littered with tens of thousands of dead animals. Dedicated animal carers could only save a small fraction of the dying bats.

A flying fox..
A flying fox. (Photo: Pixabay)

THE EL NINO CONNECTION

El Nino events – fluctuations in Pacific sea-surface temperatures that drive multi-year variations in weather across large swaths of the planet – are also part of this story. New research appears to be resolving longstanding uncertainties about El Ninos and global warming.

Recent studies published in Nature and Geophysical Research Letters suggest global warming will in fact intensify El Ninos – causing affected areas to suffer even more intensively from droughts and heat waves.

And this ties back to Puerto Rico, because the researchers there believe a series of unusually intense El Niño heatwaves were the cause the arthropod Armageddon. If they’re right then global warming was the gun, but El Niño pulled the trigger.

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BEYOND HEAT WAVES

Puerto Rico is certainly not the only place on Earth that has suffered severe declines in arthropods. Robust studies in Europe, North America, Australia and other locales have revealed big arthropod declines as well.

And while climatic factors have contributed to some of these declines, it’s clear that many other environmental changes, such as habitat disruption, pesticides, introduced pathogens and light pollution, are also taking heavy tolls.

So, at a planetary scale, arthropods are suffering from a wide variety of environmental insults. There’s no single reason why their populations are collapsing.

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The bottom line is: We’re changing our world in many different ways at once. And the myriad little creatures that play so many critical roles in the fabric of life are struggling to survive the onslaught.

Bill Laurance is distinguished research professor and Australian laureate at the James Cook University. This commentary first appeared in The Conversation.


Source: CNA/sl

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