The vessels spent most of their time circling around a floating robotic DNA lab, which drifted southward in the California Current.
This research, part of MBARI's CANON (Controlled, Agile, and Novel Observing Network) project, is all about "going with the flow"—tracking and studying how communities of microscopic marine organisms change as they are transported by ocean currents.
Conducting experiments in two very different settings
Led by MBARI biological oceanographer Francisco Chavez, during September, CANON researchers studied open-ocean water in the California Current, a meandering band of water that flows southeastward from Oregon to Northern Baja California. In October, a much larger cohort of researchers is studying the highly productive, but rapidly changing nearshore environment of Monterey Bay.
These two field experiments pose different challenges and opportunities for ocean researchers. Studying the offshore waters is challenging because humans and robotic vehicles must travel long distances and remain at sea for weeks at a time. Life in these offshore waters is often dominated by tiny organisms that are difficult to see even under a high-powered microscope, and often cannot be grown in the laboratory. These tiny organisms feed life in the ocean and have a strong influence on Earth's climate because they are so widespread.
Nearshore waters are more accessible to scientists and harbor dense populations of algae and other micro-organisms, as well as larger animals. However, this environment is affected by a web of complex interactions between the ocean, atmosphere, seafloor, land, runoff, and human activities. Because of these diverse influences, winds, currents, waves, and chemical and biological conditions often change rapidly, over periods of hours to days. This often makes it difficult for scientists to track and study ephemeral ocean features, such as algal blooms.
During both the nearshore and offshore experiments, CANON researchers simultaneously collected data on the physical and chemical properties of the ocean, along with detailed information on the algae, bacteria, and microscopic animals present. The researchers also measured the abundance of key organisms, determined how fast they were growing, and estimated how fast they were dying off or being consumed. Gathering all of this information simultaneously provides a more comprehensive picture of how the physical and chemical properties of the ocean affect the growth of entire communities of microscopic organisms.
Observing the microscopic life in moving water for more than a few hours is no easy feat. However, the CANON project builds on MBARI’s previous large-scale, multi-instrument, multi-institutional field programs, such as the Autonomous Ocean Sampling Network (AOSN). In contrast to these previous experiments, however, the CANON experiments focus on biological as well as physical processes.
The September experiment: Drifting with the California Current
The first CANON field experiment began on September 9, 2010, when MBARI’s flagship research vessel, the Western Flyer, headed westward from Moss Landing. The ship first headed west until it was 350 miles offshore, collecting water samples along the way. After analyzing these seawater samples and comparing them with satellite images of sea-surface temperature, the researchers attempted to locate the ever-changing boundaries of the California Current.
After completing this lengthy transect, the Western Flyer headed back toward the eastern (shoreward) boundary of the California Current, about 160 kilometers (100 miles) from the coast. There it met up with the research vessel Zephyr, host ship for MBARI's autonomous underwater vehicles (AUVs).
Once "on station" in the California Current, researchers on board the Western Flyer deployed a large, drifting buoy carrying a robotic DNA lab known as the Environmental Sample Processor (ESP). The Zephyr then deployed MBARI's upper-water-column AUV. At this point the field experiment began.
Drifting southward within the California Current, the ESP began automatically collecting water samples and analyzing the DNA of microscopic organisms within these samples. The Western Flyer followed the ESP as it drifted, allowing researchers to download data from the ESP and to collect water samples for later analysis on shore. Meanwhile, the AUV circled around the ESP, collecting detailed information about the physical and chemical properties of the water around it in real time.
The September CANON experiment involved a number of "firsts" for several research groups. For example, the ESP has been used in moored experiments for years, but this was the first time it collected data while drifting with the currents. In addition, the ESP was used not just to study genetic material, but to measure the amounts of important biological compounds generated by microscopic bacteria. This will help researchers understand how these bacteria are affecting the planktonic community and the rest of the food chain.
Similarly, programming MBARI's AUV to swim in circles (actually boxes) around a moving object (the drifting ESP) was a very complicated task. This provided a serious test for the AUV's control and scheduling system, known as T-REX.The drift experiment showed how complex a problem CANON is tackling. Waters were moving in different directions near the surface and just below, changing even further with depth. Had only a few days of information been collected it might have been impossible to discern what was going on. After the third day, however, the experiment started to pay off and scientists started to better understand on the complexities of the physical and chemical properties of the water. Observations showed that the photosynthetic community was dominated by very small organisms, termed picoplankton, and they were floating in relatively high levels of nitrate. The nitrate, however, was not getting utilized, and the picoplankton seemed to be using ammonia as its nitrogen source. This type of activity is common in waters that are iron-limited. Information collected previously suggested that this phenomena might occur in this part of the world during autumn but the extent of the region, covering hundreds of square kilometers surprised the CANON scientists.
Combining diverse skills for a challenging project
This project involved engineers, marine operations staff, and researchers from MBARI and other institutions. The MBARI research team for the September experiment included physical biological oceanographers Francisco Chavez and John Ryan; marine biologists Alexandra Worden and Chris Scholin; and engineer Kanna Rajan.
Research organizations participating in the project include the University of Washington (genomics) and the Massachusetts Institute of Technology (genomics). The Central and Northern California Ocean Observing System (CeNCOOS) will help get information from these experiments out to policy makers, marine resource managers, and the public.
For more information on this story, please contact:Judith Connor: (831) 775-1728, email@example.com
Nancy Barr | MBARI
Conservationists are sounding the alarm: parrots much more threatened than assumed
15.09.2017 | Justus-Liebig-Universität Gießen
A new indicator for marine ecosystem changes: the diatom/dinoflagellate index
21.08.2017 | Leibniz-Institut für Ostseeforschung Warnemünde
Plants and algae use the enzyme Rubisco to fix carbon dioxide, removing it from the atmosphere and converting it into biomass. Algae have figured out a way to increase the efficiency of carbon fixation. They gather most of their Rubisco into a ball-shaped microcompartment called the pyrenoid, which they flood with a high local concentration of carbon dioxide. A team of scientists at Princeton University, the Carnegie Institution for Science, Stanford University and the Max Plank Institute of Biochemistry have unravelled the mysteries of how the pyrenoid is assembled. These insights can help to engineer crops that remove more carbon dioxide from the atmosphere while producing more food.
A warming planet
Our brains house extremely complex neuronal circuits, whose detailed structures are still largely unknown. This is especially true for the so-called cerebral cortex of mammals, where among other things vision, thoughts or spatial orientation are being computed. Here the rules by which nerve cells are connected to each other are only partly understood. A team of scientists around Moritz Helmstaedter at the Frankfiurt Max Planck Institute for Brain Research and Helene Schmidt (Humboldt University in Berlin) have now discovered a surprisingly precise nerve cell connectivity pattern in the part of the cerebral cortex that is responsible for orienting the individual animal or human in space.
The researchers report online in Nature (Schmidt et al., 2017. Axonal synapse sorting in medial entorhinal cortex, DOI: 10.1038/nature24005) that synapses in...
Whispering gallery mode (WGM) resonators are used to make tiny micro-lasers, sensors, switches, routers and other devices. These tiny structures rely on a...
Using ultrafast flashes of laser and x-ray radiation, scientists at the Max Planck Institute of Quantum Optics (Garching, Germany) took snapshots of the briefest electron motion inside a solid material to date. The electron motion lasted only 750 billionths of the billionth of a second before it fainted, setting a new record of human capability to capture ultrafast processes inside solids!
When x-rays shine onto solid materials or large molecules, an electron is pushed away from its original place near the nucleus of the atom, leaving a hole...
For the first time, physicists have successfully imaged spiral magnetic ordering in a multiferroic material. These materials are considered highly promising candidates for future data storage media. The researchers were able to prove their findings using unique quantum sensors that were developed at Basel University and that can analyze electromagnetic fields on the nanometer scale. The results – obtained by scientists from the University of Basel’s Department of Physics, the Swiss Nanoscience Institute, the University of Montpellier and several laboratories from University Paris-Saclay – were recently published in the journal Nature.
Multiferroics are materials that simultaneously react to electric and magnetic fields. These two properties are rarely found together, and their combined...
19.09.2017 | Event News
12.09.2017 | Event News
06.09.2017 | Event News
22.09.2017 | Life Sciences
22.09.2017 | Medical Engineering
22.09.2017 | Physics and Astronomy