Deep beneath our feet and in oceans around the world, tiny creatures are locked in an intricate dance of who-eats-whom that keeps nature running smoothly. Now, scientists have proven just how important this web of life really is.
A team of more than 300 researchers from over 20 institutions worldwide took a close look at over 300 food webs from oceans, lakes, streams, and soils across the globe. Their findings, published in the journal Nature, reveal something remarkable: ecosystems with greater variety of species—and especially more types of predators—work up to 70 times better at maintaining the natural processes humans depend on, like pest control and climate regulation.
Dr. Andrew Barnes from the University of Waikato in New Zealand led the study. He explains that ecosystems don't just need lots of different species—they need those species to be connected through food chains. "Ecosystems are powered by the relationships between species—who eats whom, how energy moves through the food web and the important role predators play in keeping everything in balance," Barnes says.
These predators range from soil mites smaller than a pinhead to massive sharks. And they all play a crucial role, according to the research. When predators vanish—through habitat loss, pollution, or climate change—their absence creates ripples throughout an entire ecosystem, weakening important functions that people rely on.
Dr. Benoit Gauzens from the German Center for Integrative Biodiversity Research and Friedrich Schiller University Jena was a senior author on the study. He says the research shows that conservation can't just focus on preventing species from going extinct. It also needs to protect the relationships between species. "To understand and predict the consequences of biodiversity change, conservation must go beyond preventing species extinctions and also protect the ecological relationships that keep ecosystems productive and resilient," Gauzens says.
This makes the study the most comprehensive look to date at how biodiversity affects how ecosystems work—examining entire food webs instead of just one group of organisms at a time. The researchers hope their findings will help guide future conservation efforts, showing that protecting predators and the complex connections in nature is just as important as counting how many species exist.