Food Web News

Longfin squid (Doryteuthis pealeii) are an important species in the east coast squid fishery, which is valued at about $40 million per year. (Photo by Ian Jones, Woods Hole Oceanographic Institution)

Ocean Noise: Pile Driving Triggers Alarm Responses in Squid

predators.”In the next decade, the offshore wind industry is expected to expand rapidly in the Northeast U.S., causing concern among federal entities and commercial fishermen over how the behavior of commercially important fish and other species will be impacted.Squid play a key role in the marine food web. Many marine mammals, seabirds, and fish feed off squid, as well as humans, who eat about three million metric tons of squid annually.The results of the study could help management agencies and those in the offshore wind industry minimize disruptions to important fishery species like squid. The

(Photo: FarSounder)

3D Sonar Used in Fishery Research

assessing pelagic species.Marine technology firm FarSounder said its 3D-Sonar will allow researchers to detect and assess the fish in the sonar imagery as part of the fisheries project. Using coordinated ground-truthing methods, it is expected that the results from the project will help improve current food web models and local Rhode Island fisheries management.For this project, FarSounder is collaborating with the University of Rhode Island (URI) and the Rhode Island Department of Environmental Management (DEM). The pelagic fish data collection is taking place aboard the R/V Cap’n Bert, a stern

Photo: Schmidt Ocean Institute

Subsea Robotics: SOI Mission Discovers New Hydrothermal Vent and Species

moon, because it is hard to map underwater. This is the frontier.” The vents at the Southern Pescadero Basin offer a unique opportunity to compare microbial and animal community compositions between vents with different chemistries and mineral deposits.Microbes at these vents form the basis of the food web here, and gaining insight into the vent communities helps us understand the whole ecological system

The 180-foot RV Lake Guardian is the largest research vessel in the EPA fleet and the largest research vessel operating on the Great Lakes. It has a berthing capacity of 41 people, including 14 crew members and 27 visiting scientists. (Photo: EPA)

EPA Launches Research Vessel to Monitor Lake Ontario

, set priorities for research and monitoring, and outline further action by governments and the public for its 2018-2022 LAMP.The priority of this year’s monitoring is to improve the understanding of nutrients entering the Lake Ontario ecosystem and their impacts on water quality and the aquatic food web.Using various research vessels, the agencies will be evaluating nutrients, plankton, prey fish and predator fish. Smaller research boats will focus on near-shore activities such as evaluating nutrients and mussels, as well as performing algae research and diver surveys. The agencies will be using

Photo: Schmidt Ocean Institute

Scientists Set Record with Self-Driving Robots

the world’s oceans. Additionally, the LRAUV-collected samples containing microbial community DNA, will be analyzed back on shore with genomic studies aimed at understanding the function, activity and environmental sensitivities of microbial populations that form the foundation of the ocean’s food web

Photo: Corie Charpentier, post-doc research associate at Rutgers University

Glider-Based Ecosystem Study

between multiple trophic levels (phytoplankton, zooplankton and fish) and their relationships to the physical hydrographic driving forces such as sea ice and currents.   A key component to this investigation is the AZFP's ability to differentiate key species within this important Antarctic food web. Species of specific interest include various copepods, crystal krill (Euphausia crystallorophias), and Antarctic silverfish (Pleuragramma antarcticum). The glider was also instrumented with a CTD, a WET Labs BB2FL ECO puck to measure phytoplankton biomass and an Aandera Optode dissolved oxygen

Quagga mussels (Photo: GLERL-NOAA)

Tiny Quagga Mussels Have a Big Impact

year in Nature’s Scientific Reports.   Another impact the researchers found from their field studies is that quagga mussels are changing the way phosphorous is cycled in the lake. Normally, the amount of phosphorous, a vital nutrient needed for diatoms and other species important in the food web, rises during the winter when it is released from particulate matter resuspended from coastal sediment during storm events and turbulence. The sediment then gets transported from shallow areas to deeper regions in the lake.   “Because quagga mussels carpet the bottom of the lake, the

A satellite image shows Falkor’s track and the colors in ocean water. Colors indicate the amount of chlorophyll, where red is the highest and blue the lowest. (Image: NASA/ Norman Kuring)

New Tech Gives Insight to Ocean Color for NASA Satellites

wide variety of oceanic ecosystems. The focus of chief scientist Dr. Ivona Cetinic´, USRA/NASA, and her multidisciplinary team of oceanographers, engineers, biologists and computer scientists was to explore ocean particles, and more specifically the tiny phytoplankton that make up the base of our food web. These important organisms are difficult to study in the lab, making the opportunity to observe them at sea critical. The research will allow the science team to learn how plankton and other living things in the ocean contribute to global climate. The team will use the collected information to ground-tru

Using a new method to distinguish fresh water from oil or salt water, scientists are exploring beneath the continental shelf off New England to look for large pockets of trapped fresh water. This water may be continually filling from groundwater flowing from land or, alternatively, may have been left behind by ice-age glaciers. (Image: Eric S. Taylor, WHOI Graphic Services)

Fresh Water below the Seafloor?

sky, so it doesn’t have any iron,” Lizarralde explained. “But if its gets into the ground, it absorbs iron and other nutrients. So it has a higher nutrient content when it comes out and would be providing nutrients to the ocean.”   This has huge implications for the ocean food web and Earth’s climate. Nutrients fertilize the productivity of tiny marine phytoplankton, which convert carbon dioxide into organic carbon to grow and draw the greenhouse gas out of the atmosphere.   Signs of weakness In some places, the ocean floor has created a watertight seal above

Photo of what seaweed community looks like after introduction of invasive seaweed (Dasysiphonia japonica) (Photo: Kristen Mello/UNH)

Sea Habitats Altered by More Invasive Seaweed-Study

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

Marine Technology Magazine Cover May 2020 -

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