Rainforest Conversion to Palm Oil: Ecosystem Collapse

Estimated reading time: 5 minutes

Converting tropical rainforests to palm oil and rubber plantations massively erodes the balance of food webs in ecosystems and leads to biodiversity loss and ecosystem collapse finds a study in Nature. Researchers analysing data from Sumatra found that rubber and palm oil plantations support far less complex animal communities, with energy shifting from diverse soil arthropods to invasive earthworms. The findings highlight the fundamental ecological damage caused by agricultural expansion, beyond just species loss. Stand up for rare species when you shop and #BoycottPalmOil #Boycott4Wildlife

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A major international study published in Nature has provided the first comprehensive look at how rainforest conversion to palm oil and rubber fundamentally rewires the flow of energy through tropical ecosystems. Led by researchers from the University of Göttingen and IPB University in Bogor, Indonesia, the team analysed food webs across 32 sites in Sumatra, comparing natural rainforests with rubber and oil palm monocultures. They examined many species from microscopic mites and earthworms in the soil, to beetles and birds in tree canopies, comparing tropical rainforest with rubber and palm oil plantations to understand how these changes impact ecological function.

Food webs collapse in rainforest conversion to palm oil

The results were stark. In natural rainforests, energy flows through a complex web of diverse arthropods in both the soil and the canopy. However, in palm oil plantations, this intricate food system collapses. “Instead of diverse arthropod communities, virtually all energy was allocated to invasive species of earthworms,” the study found. Canopy food webs became less rich and complex, leading to a decline in predation and an increase in plant-feeding insects like caterpillars.

“The ongoing conversion of rainforest into palm oil plantations is not just causing a massive decline in biodiversity, but it is also changing the way these ecosystems function,” explained senior author Professor Stefan Scheu, head of Animal Ecology, University of Göttingen. “We need to understand how all these linked elements and connections are impacted. A more holistic approach can then be developed to promote the functioning of ecosystems both above and below ground.”

Simple biodiversity counts miss the full picture

The study highlights that simple biodiversity counts miss the full picture of ecological degradation. By mapping energy fluxes, the researchers showed that plantations are not just poorer in species, but functionally broken compared to the forests they replace.

First author Anton Potapov emphasised the need to look “beneath our feet” to understand these impacts fully. The findings underscore the urgency of developing more holistic conservation strategies that protect the complex interactions sustaining life above and below ground.

Anton M. Potapov, Jochen Drescher, Kevin Darras, Arne Wenzel, Noah Janotta, Rizky Nazarreta, Kasmiatun, Valentine Laurent, Amanda Mawan, Endah H. Utari, Melanie M. Pollierer, Katja Rembold, Rahayu Widyastuti, Damayanti Buchori, Purnama Hidayat, Edgar Turner, Ingo Grass, Catrin Westphal, Teja Tscharntke, Stefan Scheu. Rainforest transformation reallocates energy from green to brown food webs. Nature, 2024; DOI: 10.1038/s41586-024-07083-y

ENDS

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