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Biodiversity Protects Fish From Climate Change

Diverse Fish Communities More Productive and Resistant to Changing Temperatures

May 16, 2016

Fish provide protein to billions of people and are an especially critical food source in the developing world. Today marine biologists confirmed a key factor that could help them thrive through the coming decades: biodiversity. Communities with more fish species are more productive and more resilient to rising temperatures and temperature swings, according to a new study from the Smithsonian’s Tennenbaum Marine Observatories Network and other international institutions.

The accelerating loss and rearrangement of species all over the globe have troubled scientists and the public for decades. But the question of whether biodiversity offers practical value—for humans and ecosystems—remained controversial. The new study, published May 16 in the Proceedings of the National Academy of Sciences, offers the most thorough proof yet that preserving marine biodiversity can benefit people as much as it benefits the oceans.

“Biodiversity is more than a pretty face,” said lead author Emmett Duffy, director of the Tennenbaum Marine Observatories Network and senior scientist at the Smithsonian Environmental Research Center. “Preserving biodiversity is not just an aesthetic or spiritual issue—it’s critical to the healthy functioning of ecosystems and the important services they provide to humans, like seafood.”

The discovery came out of the Reef Life Survey, a comprehensive program that has conducted surveys of more than 3,000 fish species in 44 countries around the world. Many of the surveyors were volunteer citizen scientists, about a third of whom had no scientific background. Volunteer divers from 11 countries received training from the program’s lead scientists at the University of Tasmania to collect data using standardized methods.

“This study is based on more than 4,000 underwater surveys,” said co-author Rick Stuart-Smith of the University of Tasmania. “It was only possible with the enthusiastic contributions of highly trained volunteer divers in the Reef Life Survey program, which allowed us to achieve this comprehensive coverage of the world’s reefs, from tropical to polar waters.”

Armed with the most comprehensive global dataset on marine biodiversity involving standardized counts, the researchers tracked how 11 different environmental factors influenced total fish biomass on coral and rocky reefs around the world. Surprisingly, one of the strongest influences was biodiversity: The number of species (species richness) and the variety in how they use their environment (functional diversity) enhanced fish biomass. The boost in fish resources provided by biodiversity was second only to that of warm temperatures.

Temperature had a more complex relationship with fish biomass: Warmer ocean temperatures tended to boost fish biomass on average, while wider temperature fluctuations hindered it. But biodiversity made fish communities more resilient against changing climate. In communities with only a few species, fish biomass tended to increase with rising temperatures until seas warmed above 20 degrees Celsius (68 degrees Fahrenheit)—at which point biomass started to fall. But communities with many species remained stable at these higher temperatures.

The researchers found a similar buffering effect of diversity against temperature swings. While both high- and low-diversity communities were less productive under fluctuating temperatures, high-diversity communities suffered only half as much as low-diversity ones. The researchers suspect communities with more species are better equipped to handle temperature changes because they have more of their bases covered. When temperatures fluctuate, a community with numerous species has better odds that at least a few species can thrive in the new normal.

“This work is a critical step forward in linking insights from experiments in buckets and garden plots to the larger world,” said co-author Jonathan Lefcheck of the Virginia Institute of Marine Science, referring to earlier biodiversity experiments done with plants and small animals in gardens or greenhouses. “It shows that experimental ecologists have in fact been on the right track for 20 years, and that biodiversity is paramount to how natural systems work.”

“Preserving local biodiversity is not only an ethical directive with aesthetical and genetic insurance value,” said co-author Sergio Navarrete of the Pontifical Catholic University of Chile. “It is an imperative for human life because of the critical role it plays in providing an essential ecosystem function.”

 

For images, an advance copy of the paper or to speak to the authors, contact Kristen Minogue at 443-482-2325 or minoguek@si.edu.

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SI-250-2016

Media only 
Kristen Minogue  
(443) 482-2325 
minoguek@si.edu

John Gibbons  
(202) 633-5187 
gibbonsjp@si.edu

Scuba diver and coral reef
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Scuba diver

Graham Edgar

Reef Life Survey diver surveying fishes in the Coral Sea.

Photo: Graham Edgar

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coral reef

Rick Stuart-Smith

Reef fishes in the global centre of fish diversity, Raja Ampat, West Papua. Photo: Rick Stuart-Smith

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Goliath grouper

Graham Edgar

Goliath grouper (Epinephelus itajara) Looe Key, Fla., Sanctuary Preservation Area (no-fishing zone), Florida Keys National Marine Sanctuary.

Photo by Graham Edgar.

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Three Goliath groupers

Graham Edgar

Goliath groupers, (Epinephelus itajara),  Looe Key, Fla., Sanctuary Preservation Area (no-fishing zone), Florida Keys National Marine Sanctuary.

Photo by Graham Edgar.

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Potato cod

Graham Edgar

Potato cod (Epinephelus tudula) in no-fishing zone, northern Great Barrier Reef.

Photo by Graham Edgar. 

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Rick Stuart-Smith

Reef Life Survey diver surveying reef fishes at Raja Ampat, West Papua.

Photo by Rick Stuart-Smith

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Scuba diver

Emmett Duffy

Fish count on transect, Isla Pastores, Caribbean Panama.

Photo by Emmett Duffy

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Emmet Duffy

Reviewing survey data at Bocas del Toro, Panama.

Photo by Emmett Duffy

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Graham Edgar

Reef Life Survey diver observing leafy seadragon in southern Australia.

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