Southwest Fisheries Science Center: 25 years studying the Antarctic seas

Twenty-five years ago the Southwest Fisheries Science Center was formed in La Jolla, California. And since that time, federal researchers have been plying the Antarctic seas, monitoring the health and biodiversity of that chilly region to the south.

Their studies have resulted in the declaration of as many as 30 biological hotspots that need protection from overfishing and destructive bottom-harvesting techniques. In addition, the researchers continue to monitor the impact of commercial fishing on species such as Chilean sea bass (renamed from Antarctic or Patagonian toothfish) and the overall population of krill, currently being harvested for vitamins and fish meal.

A popular commercial fish, Chilean sea bass numbers have plummeted by as much as 80 to 90% and more, according to some experts. But even with conservation efforts in place and many chefs and restaurants choosing not to carry the tasty fish on their menus, their numbers remain drastically low.

“That is one of the key things we want to unravel,” said George Watters, director of the Antarctic Ecosystem Research Division at the fisheries center. “Why haven’t these things recovered? We want to know that so that in the future we can prevent that kind of thing from happening again.”

The work undertaken by the Southwest Fisheries Science Center is by no means easy. Two month-long expeditions take place every January and February when sea conditions in the Southern Ocean are most favorable. But at best, it's bone-chilling work as the researchers monitor seal and sea birds movements, take video and samples from the sea floor, and basically spend time in one of the most inhospitable places on the planet for the purpose of gauging the overall health of an ecosystem that, as remote as it is, is closely tied to all of us.

“The real challenge with our work is to sort out the causes of the different trends we see,” said Mike Goebel, a wildlife biologist with the program. “Sometimes it can make sense and other times it doesn’t make sense, so you are always searching for the best possible explanation of what we observe.”

Of particular interest to the researchers, has been the study of krill populations and the impact of commercial harvesting on this fundamental ocean food source. If you have sprinkled fish meal on your plants or popped an Omega-3 vitamin supplement in the morning, there's a good chance that it consists of krill. Since krill is the principal food source for many ocean species, a decline in krill populations can have tremendous adverse effects on other species. And there are indications that krill populations have declined by as much as 80% in some areas.

One of the many challenges facing the seas of the Antarctic is a confusion or outright lack of unifying international regulations and management to protect the Southern Ocean. Many interested nations are looking to solve the situation and avoid a disastrous exploitation of the region from legal or illegal harvesting activities.

“There is a huge emphasis globally on maintaining the uniqueness and special character of Antarctica,” director Watters said. “Decision-making is supposed to be made on the basis of the best available scientific evidence. That is where we come in.”

Read more about the center's studies in the San Diego Union-Tribune.

Whales & Carbon Sequestering: new study shows potential carbon storing by large whales

Following up on my recent post about whalers being early and unintentional environmentalists, here's some interesting news coming out of the University of Maine. A study conducted by researchers from the university, in addition to the University of British Columbia and the Gulf of Maine Research Institute, outlines the enormous carbon sequestering ability of whales and other large marine species; an ability that puts these animals on a par with other carbon storing organisms like peat bogs, grasslands and trees.

As an example, a blue whale can store up to 9 tons of carbon, surpassed only by large trees. But since the populations of blue whales have been reduced by as much as 99 percent, the planet has lost a vital source of carbon sequestration. Andrew Pershing, one of the Maine research scientists, describe the loss of potential carbon storage due to a century of whaling as the equivalent of burning more than 70 million acres of temperate forest or 28,000 SUVs driving for 100 years.

Many scientists have proposed "iron fertilization" as a method for sequestering carbon in the oceans. This process bonds iron particles with carbon and then, as the iron sinks into deep ocean depths, it takes along with it an amount of carbon. Pershing, whose research was supported by NASA and the National Science Foundation, sees whale conservation as equally if not more effective.

Pershing noted, “The big surprise was in our calculations comparing carbon exported by sinking whale carcasses to the carbon exported by iron fertilization. If we had all the whales we used to have, they would remove the same amount of carbon in a year as 200 of the most efficient iron fertilization events. What that tells me is that we can get significant carbon savings by conserving resources in the ocean, protecting whales, larger fish and sharks.”

Additionally, The larger whale and marine species prove to be more efficient at carbon storage than smaller species. While all animals absorb some measure of carbon (we're carbon lifeforms, remember?), the larger animals require less food (which equates to carbon) per unit of weight. The same amount of food can support more whale tonnage than, say, compared to penguins.

As the University of Maine reported in a recent press release, according to Pershing, “In many ways bigger is better.” Any whale could have told us that.

Read the University of Maine press release.

New Deep Ocean Species: RRS James Cook studies the Mid-Atlantic Ridge

Perhaps you have heard it said that over 75% of the Earth's surface is covered by water but that we have explored less than 5% of the world's oceans. Some have said we know more about the backside of the moon than we do about the ocean depths right here at home.

Whenever scientists pull back the curtain and gaze into the depths, something new is always discovered - a new species, a new geographical formation, or a new process invaluable towards understanding the complex inner workings of marine ecosystems.

The renown U.K. research vessel, RRS James Cook, has recently released pictures taken of several potential new species from the ocean depths along the northern portion of the Mid-Atlantic Ridge. Using the ROV named ISIS, which was able to view the creatures alive and free swimming at depths as deep as 8800 feet (2700m), researchers from the University of Aberdeen noted the marked differences in sealife on either side of a 10-mile wide span of the ridge (where northern cold waters meet warmer southern waters).

Click here to view a series of images taken by ISIS, published in the Guardian.

The Mid-Atlantic Ridge actually is the meeting of two major tectonic plates in the Atlantic Ocean and runs a considerable distance beginning near Greenland and extending all the way into the South Atlantic, below Africa. Along the way, there are deep trenches and mountain ridges. In the past, scientists have trawled the bottom to see what type of animals live there, but such methods often did considerable damage to the specimens. With today's advanced submersibles and ROVs, researchers are now able to see these animals unharmed and living in their natural environment.

The deep oceans are a major part of the macro-marine ecosystem and so it is important that we study and gain a better understanding of these mysterious regions as to how they survive, how they interact with and impact shallower bodies of water, and how our activities can affect these great depths which, in turn, could alter the overall health of the oceans and the planet.

Coral Reef Studies: stress the importance of holistic reef management

Was perusing through two articles on coral reefs that addressed the same basic issue - coral health - and had an interesting connection.

First, for those of you who are not familiar with the coral-zooxanthella relationship, within the tissues of coral are forms of algae, zooxanthellae, that provide much of the coral's color. This algae exists in a symbiotic relationship with the coral: basically, the coral generates wastes and nitrogen which the algae feed on and, in return, the algae produces nutrient sugars that the corals require.

Healthy coral exists only within very specific parameters and when environmental conditions are not ideal, as with an increase in water temperature, the algae disappears and the overall health of the coral is weakened, a condition called "coral bleaching" which can often prove fatal for the coral. Coral bleaching can be a naturally occurring event, like lightning-induced forest fires, which nature can withstand or handle. But climate change has been cited as a leading cause of an alarming increase in coral bleaching events worldwide.

A study published in Ecological Applications (Vol. 19[6]), detailed how better coral reef management which would produce clearer and cleaner water can help improve the coral's ability to withstand the effects of temperature change, thereby better resisting coral bleaching events. The article, Improved water quality can ameliorate effects of climate change on corals, cited coral's inability to genetically adapt or to alter the coral-zooxanthella relationship to better resist changes in temperature. The study reviewed data from coral bleaching events occurring in Australia's Great Barrier Reef during 1998 and 2002, examining relationships between heat stress and nutrient flux (what's in the water). Areas of poorer water quality played a significant role in the severity of the coral bleaching event.

So, what kind of factors can impact the water quality surrounding coral reefs and how can coral reef management be of help?

Another study, published in Environmental Pollution (Vol. 157[8-9]), also examined the Great Barrier Reef - this time focusing on pollution, specifically herbicides which, along with insecticides and fungicides, make their way into the coral reef ecosystem as runoff from agricultural areas through rivers and creeks. According to the article, Herbicides: A new threat to the Great Barrier Reef, even at low trace levels, these pollutants can impact the overall health of the corals, thereby reducing their ability to withstand any other adverse changes to the environment, such as temperature change, and making them more susceptible to coral bleaching.

Proper coral management must be a far-reaching holistic approach encompassing activities, such as agricultural development in developing countries, that can contribute to a compromised marine ecosystem already beset with worldwide issues like climate change. Healthy coral reefs provide home and food for a variety of sealife, a natural barrier to protect island communities from weather-inspired wave action and, at the very least, serve as a barometer for the overall health of the oceans.

To learn more about coral reef conservation:

• The Nature Conservancy's coral reef program
• Oceana PSA on coral reefs and bottom-trawling
• Reef Check's coral monitoring program
• Coral Reef Alliance's web site
• NOAA's coral reef conservation program
  

Coral Reef Ecosystem: complex with multiple variables at risk

Coral reefs are one of the ocean's most colorful and complex creations. I'm sure you have read about how they are in peril. Climate change, acidification, human development - all are having an impact, most often represented by coral bleaching which is the result of the loss of the symbiotic algae that lives within the coral.

I was reviewing several scientific papers and found that there are many studies going on to determine more specifically what is happening to the reefs. As it turns out, the external factors of temperature, pollutants, and others can trigger a variety of eco-systemic or internal components that adversely affect the coral. Oh, if it were only simple, then the solutions might be simpler too.

One study examined the impact on several species of reef fish and their aerobic scope, or ability to breath, in elevated temperatures. Ever felt your breathing was a bit more labored on a really hot day? Well, according to this study, reef fish can have a similar reaction when water temperatures rise. This causes a reduced capacity to absorb oxygen which weakens the health of the fish, its level of immunity, and overall lifespan.

Water quality was found, in another study, to impact the sensitivity of corals to coral bleaching. "Terrestrially-sourced dissolved inorganic nitrogen" or DIN was found to make coral more sensitive to the temperature threshold that triggers coral bleaching. Higher levels of DIN are often found in areas of human development in the form of runoff from urban development or construction.

The levels of nutrients within a coral reef system can also effect the balance between hard corals, anemones, and algae. All three live in relative harmony, with hard corals as the dominant species. But in the typically low-nutrient world of a healthy coral ecosystem, warmer temperatures can increase nutrient levels and, at various levels, the anemones become more aggressive towards the coral and at the highest levels, the algae becomes dominant.

Coral reef ecosystems are tremendously complicated and we are continually learning more about the inter-relationships of species and the environment. And not everything falls into perfect agreement. One study that reviewed the relationship between temperature and salinity at a mass bleaching in Thailand, found that salinity did not seem to play a critical role in triggering the event. Whereas, another study concluded that higher salinity levels can impact both the coral host and its symbiotic algae, effecting its long-term health.

We still have much to learn but the research must continue so that we have a clear understanding as to what is happening to the earth's coral reefs so that we can both potentially treat and prevent the abuses that are impacting these critical marine ecosystems.

Undersea Voyager Project: success with its first mission

In December of 2008, I posted about a new research organization,the Undersea Voyager Project, headed up by Scott Cassell. The project intends to push marine education forward through the use of state-of-the-art submersibles. Having just completed some initial checkout dives in Lake Tahoe, here's Scott's latest report:

I am proud to announce that the first mission of the Undersea Voyager Project (TAHUV) was a success.

With Bob Oberto resigning from the UVP, the UVP Team pulled together and scrambled to put a new list of scientists and researchers together quickly. They were successful and integrated the new science team seamlessly into 11 submersible dives.

We achieved much, made several discoveries (i.e. 3 ‘new’ ancient trees were discovered, and potentially a new species of Protist) and we had a lot of fun. I am extremely proud of the UVP Team.

Dive targets successfully explored with scientists in situ ranged from:
• Two Earthquake Faults (Dr. Schwickert, UNR)
• River/Lake interface (Geoffrey Schladow, UCD)
• Volcanic Mud Flows and Tsunami Mega Ripples (Neil Rondorf, SAIC)
• 2,000-year-old ancient trees (Dr. Andrew Klesh, UM, Dr. Daniel Brothers, UCSD, Dr. Letti Ramirez, CSUEB)
• Possible discovery of a new species (or re-finding an old one) of Protist (Dr. Christopher Kitting, CSUEB, Scott Valentine, LTCC).

And from the original list of scientists the UVP Team was able to dive Dr. Graham Kent, SIO, UCSD on the ancient trees as well.

A total of 58 submersible dives were performed and 33 SCUBA dives.

The UVP team was also successful with performing two live broadcasts from the submersible underwater! One on Fox 40 Morning Show and one on Good Day Sacramento. In both live broadcast, the reporter was able to dive in the sub and talk to the Anchor team back at the broadcast stations whom watched in real time.

Media attention was amazing! I was on the following programs promoting the UVP mission:
• Australian Broadcasting Network News
• KTHO AM 590 with Tom Singerline
• Wave Magazine
• Fox 40
• Fox News
• KOWL Radio with Howie (twice)
• Good Day Sacramento (Twice)

I am writing 8 articles at the moment about the TAHUV for both printed and Internet magazines and several TV groups have approached us to be on their talk shows over the next month.

I also initiated the ‘Youth Undersea Ambassador’ program. Three teenage kids were selected based on scientific programs they are active in, personality and support from parents and their principals. These kids performed a series of dives in the submersible (including piloting it) and were involved in data collection and observations of targets. Each was also trained in being a ‘Submersible Support Swimmer’ which included venting the submersible’s ballast system for the beginning of each dive and blowing the ballast system for surfacing and recovery. They are obligated to deliver lectures to their student peers and/or community based on the UVP mission on “What it is like to be a young Explorer / Scientist” three times this year. The program has been highly successful and the community of Lake Tahoe has been greatly supportive of it.

The TAHUV was filmed in both High Definition and in 4K Red Camera. We will use this outstanding footage for promotion (including for the D.E.L.I.V.E.R. program if the Team wishes) of the UVP, the production of two documentaries and one short IMAX teaser.

The UVP team consisted of:
Scott Cassell, President, Founder and Chief Sub Pilot
Shawna Meyer, Co-Founder (not present)
Will Kohnen, President of SeaMagine Hydrospace & Interim Vice President
Peri Best, Expedition Manager
Reds Regan, Expedition Coordinator, Artist
Julie Regan, TRPA Liaison Officer
Professor Scott Valentine, South Lake Tahoe College, Science Liaison
Dr. Jeff Wachs, D.O. UVP Team Medical Doctor
Dr. Andrew Klesh, Team Engineer, Space & Sea Interface Officer
Jenna Whisenand-Palacio, Media & Public Relations
Tom Loomis, Local Tahoe Region Liaison
Greg Mikolesek, Photographer and Diver, Viking & VR Liaison
Ivo Kocherscheidt, UVP Historian and Photographer
Steffen Schultz, Film Maker, Producer, Strange Media Productions
Robert Alan Martin, Film Maker, Producer, California Academy of Arts, Sausalito, CA
Nathan Garofalos, Film Maker, Producer Red Camera (IMAX Teaser)
Ildiko Nemeth, Foreign Affairs Officer
Paul Wilton, Machinist
Leslie Wilton, Artist
Steve Blair, Icthyologist, Assistant Curator - Aquarium of the Pacific

Youth Ambassadors
Nichole Phelan, Marine Biology, Geology student
Sid Loomis, Marine Exploration, Geology student
Mattie Ordway, Marine Biology, Ecology student

Support Volunteers
Dr. Andrea Donnellan, Website Designer and Master
Jim Phelan, Tahoe City Marina General Manager and Nichole’s Father
Adam & Wendy Muskovitz, Best Rent Tahoe
Jeanne Merkelbach, Tahoe Keys Resort and Marina
Ed Roe, Fire Fighter - Engineer, City of South Lake Tahoe
Carey Loomis – Transportation, Logistics and Sid’s mother
Robert Ordway – Diver and Maddi’s father
Adam Compton, relief Sub Pilot – SeaMagine

I am currently still in Lake Tahoe assisting in the editing of a short ‘trailer’ for the UVP and writing the documentary with Nathan Garofolos (which he will edit over the next three months)

We are in the planning stages of the one-month-long California Undersea Voyage (CalUV) in which we will perform survey dives completely around the Channel Islands with scientists and teachers from local institutions. Many of these dives will be broadcast in real-time to educational institutions and classes. Estimated time for this expedition is late summer.

The UVP is now open for business and I am proud to be a part of the D.E.L.I.V.E.R. Proposal. This will be a good year!

Scott Cassell
Founder
Undersea Voyager Project
www.underseavoyager.org