Walking along the beaches of New England, it is easy to spot large amounts of a fine red seaweed clogging the coastline, the result of sweeping changes in the marine environment occurring beneath the water. To further investigate, researchers at the University of New Hampshire looked at seaweed populations over the last 30 years in the Southwestern Gulf of Maine and found the once predominant and towering kelp seaweed beds are declining and more invasive, shrub-like species have taken their place, altering the look of the ocean floor and the base of the marine food chain.
In the study, recently published in the Journal of Ecology, researchers compared photos of sections of the sea floor, collected over 30 years, at several subtidal sites in the Southwestern Gulf of Maine. They also collected individual seaweed species to determine their complexity and the biodiversity of meso-invertebrates (smaller ocean species that fish and shellfish, such as crabs, feed on) associated with each seaweed species.
The data showed that the seaweed community, as well as the number and types of small creatures, had significantly changed. The invasive fiber-like red seaweeds (Dasysiphonia japonica ) had covered up to 90 percent of some areas, altering the visual landscape, and the newly created habitat structure now supported two to three times more small creatures at the base of the food chain.
"We were very surprised by what we saw," said Jennifer Dijkstra, research assistant professor in the Center for Coastal and Ocean Mapping at UNH and the lead author of the study. "In some areas, what was once a forest of tall blades of kelp with a high canopy height was now composed of bushy invasive seaweed species which had a much shorter canopy and a very different physical form."
Studies have found that kelp forests are one of the most productive systems in the ocean with high biodiversity and ecological function. They occur along the coastlines of most continents. Kelp provides a long three dimensional structure that offers protection and a source of food for many juvenile species of fish (pollock, cod, and flounder), juvenile and adult shellfish (lobsters and crabs), seals and birds (terns and gulls).
"While the changing seascape has dramatically altered and increased the diversity and number of small creatures at the base of the marine food web, we still don't know how these changes in the ecosystem will propagate through the entire chain. Even though there may be more creatures at the base, it's not clear what their effects will be on fish or other crabs in the habitat, and how much protection the new landscape will provide," said Dijkstra.
Researchers say on-going studies are looking at the effects of the invasive types of seaweed and why they are so successful in the Gulf of Maine. They speculate that a number of events that relate to historical fishing practices, both commercial and recreational, combined with the warming waters in the Gulf of Maine may be increasing the negative effects of the growth of kelp.
Co-authors on this study, all from UNH, are Larry Harris, professor of zoology; Kristen Mello '14, research technician; Amber Litterer '16, Shoals Marine Laboratory; Christopher Wells, former research technician currently at the University of Washington; and Colin Ware, director of the Data Visualization Lab at the Center for Coastal and Ocean Mapping.
The University of New Hampshire is a flagship research university that inspires innovation and transforms lives in our state, nation and world. More than 16,000 students from all 50 states and 71 countries engage with an award-winning faculty in top ranked programs in business, engineering, law, liberal arts and the sciences across more than 200 programs of study. UNH's research portfolio includes partnerships with NASA, NOAA, NSF and NIH, receiving more than $100 million in competitive external funding every year to further explore and define the frontiers of land, sea and space.
Images to Download:
Image of one species of invasive seaweed, Dasysiphonia japonica.
Photo credit: Amber Litterer/UNH
Photo of historical kelp forest bed (before introduction of invasive seaweed).
Photo credit: Larry Harris/UNH
Photo of what seaweed community looks like after introduction of invasive seaweed (Dasysiphonia japonica)
Photo credit: Kristen Mello/UNH
Robbin Ray | EurekAlert!
Despite government claims, orangutan populations have not increased. Call for better monitoring
06.11.2018 | Deutsches Zentrum für integrative Biodiversitätsforschung (iDiv) Halle-Jena-Leipzig
Increasing frequency of ocean storms could alter kelp forest ecosystems
30.10.2018 | University of Virginia
Researchers at the University of New Hampshire have captured a difficult-to-view singular event involving "magnetic reconnection"--the process by which sparse particles and energy around Earth collide producing a quick but mighty explosion--in the Earth's magnetotail, the magnetic environment that trails behind the planet.
Magnetic reconnection has remained a bit of a mystery to scientists. They know it exists and have documented the effects that the energy explosions can...
Biochips have been developed at TU Wien (Vienna), on which tissue can be produced and examined. This allows supplying the tissue with different substances in a very controlled way.
Cultivating human cells in the Petri dish is not a big challenge today. Producing artificial tissue, however, permeated by fine blood vessels, is a much more...
Faster and secure data communication: This is the goal of a new joint project involving physicists from the University of Würzburg. The German Federal Ministry of Education and Research funds the project with 14.8 million euro.
In our digital world data security and secure communication are becoming more and more important. Quantum communication is a promising approach to achieve...
On Saturday, 10 November 2018, the research icebreaker Polarstern will leave its homeport of Bremerhaven, bound for Cape Town, South Africa.
When choosing materials to make something, trade-offs need to be made between a host of properties, such as thickness, stiffness and weight. Depending on the application in question, finding just the right balance is the difference between success and failure
Now, a team of Penn Engineers has demonstrated a new material they call "nanocardboard," an ultrathin equivalent of corrugated paper cardboard. A square...
09.11.2018 | Event News
06.11.2018 | Event News
23.10.2018 | Event News
16.11.2018 | Health and Medicine
16.11.2018 | Life Sciences
16.11.2018 | Life Sciences