Biodiversity as important as reducing pollution for seagrass ecosystems
Marine "bugs and slugs" make ideal houseguests for valuable seagrass ecosystems. They gobble up algae that could smother the seagrass, keeping the habitat clean and healthy. That's according to results from an unprecedented experiment spanning the Northern Hemisphere and led by an international team of scientists, including marine biologists from UC Davis.
The study, led by the Virginia Institute of Marine Science, was conducted simultaneously at 15 sites across seven countries through a project called the Zostera Experimental Network, or ZEN, after the seagrass species Zostera marina.
"Our results show that small marine invertebrates are really important," said Pamela Reynolds, a postdoctoral scholar at UC Davis and VIMS and the ZEN project coordinator. "They graze down seaweeds that might otherwise smother the seagrass. It's a really neat partnership--the animals get a home, and the seagrass stays clean. We found that the more diverse communities of these little algae-eating animals do a better job of keeping the seagrass clean and healthy."
Reynolds said the results support that comprehensive coastal management should consider how to maintain robust populations of animals in addition to managing for the more conspicuous effects of pollution and disturbance.
Seagrass meadows provide valuable fish nurseries and feeding grounds for birds, sea turtles and manatees. They sequester carbon, and their root systems help bind and protect coastlines. Yet, they are declining worldwide due to host of factors.
The researchers explored which of two known threats to seagrass has the greater impact on seagrass ecosystems: pollution from fertilizers or the loss of invertebrate species due, in part, to fishing.
THE IMPORTANCE OF BIODIVERSITY
To simulate nutrient pollution, the team members fertilized the seagrass similarly to how one would a lawn. Then they drove away small crustacean grazers by applying a chemical deterrent, simulating changes in the food web from fishing. On average, removing the grazers produced more algae than adding the fertilizer.
"Our results provide rare large-scale confirmation of the importance of biodiversity to healthy ecosystems," said Emmett Duffy, the study's lead author and director of the Smithsonian's Tennenbaum Marine Observatories Network. "It's widely understood that controlling algal overgrowth of seagrasses requires reducing fertilizer runoff, but it turns out that maintaining diverse populations of the bugs and slugs that clean these underwater plants is just as important."
The ZEN project is now in its second generation and has expanded to 25 institutions and more than 50 research sites from the Russian Arctic to Mexico and South Korea. Ongoing work by this collaborative team of more than 200 scientists and students seeks to understand how the diversity of seagrass animals and plants contributes to fish production, carbon storage and other ecosystem services.
"Honestly, its a new way of doing science for many of us," said Jay Stachowicz, professor of Evolution and Ecology at UC Davis. "Ceding control of our experiments and data collection is hard for many of us who were trained to be fiercely independent. But the payoff is this kind of surprising result that none of us could have obtained on our own and a built-in consensus because we were all involved in each phase of the project."
The study was published in Ecology Letters and supported by grants from the National Science Foundation and local support from the 15 partner institutions.
The study is available at http://bit.
Pamela Reynolds | EurekAlert!
Preservation of floodplains is flood protection
27.09.2017 | Technische Universität München
Conservationists are sounding the alarm: parrots much more threatened than assumed
15.09.2017 | Justus-Liebig-Universität Gießen
University of Maryland researchers contribute to historic detection of gravitational waves and light created by event
On August 17, 2017, at 12:41:04 UTC, scientists made the first direct observation of a merger between two neutron stars--the dense, collapsed cores that remain...
Seven new papers describe the first-ever detection of light from a gravitational wave source. The event, caused by two neutron stars colliding and merging together, was dubbed GW170817 because it sent ripples through space-time that reached Earth on 2017 August 17. Around the world, hundreds of excited astronomers mobilized quickly and were able to observe the event using numerous telescopes, providing a wealth of new data.
Previous detections of gravitational waves have all involved the merger of two black holes, a feat that won the 2017 Nobel Prize in Physics earlier this month....
Material defects in end products can quickly result in failures in many areas of industry, and have a massive impact on the safe use of their products. This is why, in the field of quality assurance, intelligent, nondestructive sensor systems play a key role. They allow testing components and parts in a rapid and cost-efficient manner without destroying the actual product or changing its surface. Experts from the Fraunhofer IZFP in Saarbrücken will be presenting two exhibits at the Blechexpo in Stuttgart from 7–10 November 2017 that allow fast, reliable, and automated characterization of materials and detection of defects (Hall 5, Booth 5306).
When quality testing uses time-consuming destructive test methods, it can result in enormous costs due to damaging or destroying the products. And given that...
Using a new cooling technique MPQ scientists succeed at observing collisions in a dense beam of cold and slow dipolar molecules.
How do chemical reactions proceed at extremely low temperatures? The answer requires the investigation of molecular samples that are cold, dense, and slow at...
Scientists from the Max Planck Institute of Quantum Optics, using high precision laser spectroscopy of atomic hydrogen, confirm the surprisingly small value of the proton radius determined from muonic hydrogen.
It was one of the breakthroughs of the year 2010: Laser spectroscopy of muonic hydrogen resulted in a value for the proton charge radius that was significantly...
17.10.2017 | Event News
10.10.2017 | Event News
10.10.2017 | Event News
19.10.2017 | Materials Sciences
19.10.2017 | Materials Sciences
19.10.2017 | Physics and Astronomy