New international research has found 25% of carnivorous plant species may be at risk of extinction

'Save me Seymour!'
Pitcher Plants. Credit: Dr Adam Cross

New international research led by Curtin University has found approximately a quarter of carnivorous plant species across the world may be at risk of extinction due to global climate change, illegal poaching, and the clearing of land for agriculture, mining and development.

Carnivorous plants are predatory plants which obtain some or most of their nutrients through specialized adaptations that allow them to attract, capture and kill their prey—mainly flies and other small insects but occasionally even birds and small mammals. Well-known species of include the Venus fly trap and pitcher plants.

Lead researcher, restoration ecologist Dr. Adam Cross from the School of Molecular and Life Sciences at Curtin University, said the loss of carnivorous plants would not only be devastating due to their captivating qualities, but could potentially have detrimental effects across ecosystems.

"Carnivorous plants are an iconic group of plants, and they are often involved in complex biological relationships with animals—sometimes providing habitats for animals, or even relying upon animals to digest the prey they catch for them," Dr. Cross said.

"Our research has found around 25 per cent of the world's carnivorous plants are at increasing risk of extinction. Australia is currently sixth in the world for harboring the most Critically Endangered carnivorous plant species, behind Brazil, Indonesia, Philippines, Cuba and Thailand."

Carnivorous plants usually occur in extremely sensitive habitats, and are often in areas experiencing direct conflict with human activities.

During the team's research, each of the over 850 known carnivorous plant species was assessed for its exposure to threats such as residential and commercial development; agriculture and aquaculture activities; energy production and mining; transport development, such as land clearing for roads or trains; human exploitation, such as illegal collection; pollution; geological events; climate change; and severe weather.

"Globally speaking, the biggest threats to carnivorous plants are the result of agricultural practices and natural systems modifications, as well as continental scale environmental shifts caused by climate change," Dr. Cross said.

"In Western Australia, which harbors more carnivorous plant species than any other place on Earth, the biggest threat remains the clearing of to meet , resulting hydrological changes, and of course the warming, drying climate trend that affects much of Australia."

Research co-author Dr. Andreas Fleischmann, from Botanische Staatssammlung Munich and Ludwig-Maximilians-University Munich, Germany, also noted that illegal poaching of carnivorous plants was a large problem.

"Noting their unique and fascinating features, some species of carnivorous plants are illegally collected from their natural habitats and sold to collectors. Poached plants of some species sell for hundreds of dollars," Dr. Fleischmann said.

Looking to the future, research co-author Dr. Alastair Robinson from Royal Botanic Gardens Victoria, stressed the need for immediate action in order to save carnivorous species from extinction.

"Conservation initiatives must be established immediately to prevent these species being lost in the coming years and decades," Dr. Robinson said.

"Urgent global action is required to reduce rates of habitat loss and land use change, particularly in already highly-cleared regions that are home to many threatened carnivorous plant , including habitats in Western Australia, Brazil, southeast Asia and the United States of America."

More information: Adam T. Cross et al, Conservation of carnivorous plants in the age of extinction, Global Ecology and Conservation (2020). DOI: 10.1016/j.gecco.2020.e01272

Provided by Curtin University

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