Ocean Acidification: additional not-so-fun facts

A new term that more and more of the general public is hearing about is ocean acidification - the process whereby the pH level of the oceans is lowered, making it more acidic. This effect is a byproduct of global CO2 emissions and has been documented as having a negative effect on many forms of shellfish and other creatures that depend on the use of calcium carbonate in their development (calcium carbonate is broken down in the acidification process).

Much has been written about how ocean acidification will impact coral reefs, as calcium carbonate is a major component of the supporting skeleton of reef-building corals. But tropical waters are not the only locales affected. The Seattle Times recently reported on the effects of ocean acidification on Pacific oysters fields both in the wild and in commercial oyster farms.

The deep waters off the northwest shores of Oregon and Washington are much more highly acidic than the ongoing average (even with the "average" becoming more acidic, these waters are still higher than shallower waters). For commercial oyster farms who pull in seawater to help raise oyster larvae, as long as the winds blow in the right direction, they appear to be relatively free from harm.

But winds can blow in ways that move surface water and draw in water from below - an upwelling as it is called. And this can spell trouble for the oysters, especially those living in the wild. The lowering of the pH (raising the acidic level) impacts the growth of new larvae, baby oysters, and even the reproductive cycles of adult oysters. Pacific oysters have not reproduced in the waters off Washington state's coast in six seasons.

"Nobody had thought about those upwelling events," said NOAA oceanographer Richard Feely. "They didn't predict any impacts along the coast until we observed them."

But oysters and other shell fish are not the only creatures potentially affected by corrosive, acidic waters. Changing the ocean's pH can have impacts on an animal's behavior and even the ocean's acoustical properties.

The Seattle Times listed these additional disturbing facts as a result of acidification:

• The metabolism of squid can change, making them more lethargic - perhaps affecting their hunting ability and susceptibility to predation.
• Acidic waters affect the way young fish larvae seek out prey and can actually be drawn to predators. An Australian researcher discovered that clownfish and some damselfish larvae get confused in corrosive water and seek out the smell of rock cod - one of their own predators.
• Water with a lower pH has a different density, and so acidification changes the acoustical properties of seawater, essentially making it a noisier place. This could impact whales and dolphins that rely on their underwater sonar or echolocation for hunting.

But what concerns researchers the most in the Pacific Northwest is the fundamentals. "What I'm most worried about is the bottom of the food chain, things such as plankton and other small sea creatures," said John Guinotte, a marine biogeographer with the Marine Conservation Biology Institute in Bellevue, Washington. "We've got some of the lowest pH levels found anywhere, but we don't have any idea what the biological impacts are."

Through our actions, we are pushing the oceans into a brave new world, one in which it may adapt but not without serious consequences to a wide range of animal species, including mankind.

Read the Seattle Times article.

Shark Week 2010: how to balance against one particular perspective

It's Sunday and so begins Discovery Network's annual week-long programming of shark "documentaries" - Shark Week 2010. This event has been a ratings success (translating into advertising dollars) but exasperated shark advocates have reviled the network's reliance on over-sensationalism and distortion of the facts.

The programming usually consists of one large budget new program, several new smaller budget programs, and then the rest of the programming slate is filled out with selections from the network's vast library of shark programs they have amassed over the past 20+ years. This week's promotional spots for Shark Week seemed sharp-witted and exciting, so let's see what the new program lineup looks like:

• Ultimate Air Jaws - leaping South African white sharks seen in super-slow motion. Hmmm, could be interesting.
• Into the Shark Bite - Hmmm.
• Shark Attack Survival Guide - Hmmm.
• Day of the Shark 3 - HmmmMMmmm.
• Shark Bite Beach - HmmmMMMmmmhhhmmm.
• Shark Bites; Adventures in Shark Week with Craig Ferguson - Hmmm. Well, at least he's funny.

So, is there a counterbalance to Shark Week that helps to put things in some sort of reasonable perspective? Sure, in the form of blogs, shark conservation groups, and videos. Here's just a few, in no particular order or preference (and my apologies to any that I left out):

Blogs:

• Ultimate Thrills: Swimming with Sharks
• Best Shark Dive in the World
• The Dorsal Fin
• Why Sharks Matter
• And of course, RTSea Blog

Shark Conservation Groups:
There are so many (perhaps too many, as it leaves the movement highly fragmented), so in no particular order or preference. . .

• Shark Free Marinas Initiative
• Shark Research Institute
• Iemanya Oceanica
• WildAid
• Save Our Sea Foundation
• The Global Shark Initiative

Videos:

• Island of the Great White Shark
• Sharks At Risk
• Sharkwater

So, if you or your neighbors wonder out loud this week as to what all the fuss is about with sharks (Are they malevolent monsters out to get us? Or are they hapless victims of ruthless hunters and bad public relations?), check out some of the items listed above. When it comes to sharks, the truth is definitely more interesting than fiction.

Nature Crimes: professor looks at how conservation can go wrong

Now here is a different spin on current conservation strategies, one that takes a skeptical look at the overall approach taken by many western-style societies when it comes to implementing animal reserves and ecotourism operations. It may not be a perspective that you agree with (it made me squirm in my seat to read it), but as we move forward in our efforts to conserve animals and natural resources worldwide, it's worth considering so that we can best insure that we're on a fair course.

As reported in The Guardian, in the new book Nature Crime: How We're Getting Conservation Wrong, author and professor of international politics Rosaleen Duffy declares that, in many developing countries where endangered species or habitats exist, conservation efforts often penalize or even criminalize large segments of a population which can threaten their very existence. According to Duffy (who supports the need for animal and habitat protection), this can cause bigger long-term problems in keeping these disenfranchised groups in step with the program.

The Guardian reports, "When wildlife reserves are established, Duffy says, local communities can suddenly find that their everyday subsistence activities, such as hunting and collecting wood, have been outlawed.

At the same time, well-intentioned attempts to protect the habitats of animal species on the edge of extinction lead to the creation of wild, 'people-free' areas. This approach has led to the displacement of millions of people across the world.

'Conservation does not constitute neat win-win scenarios. Schemes come with rules and regulations that criminalize communities, dressed up in the language of partnership and participation, coupled with promises of new jobs in the tourism industry.'"

Ecotourism is another area in which Duffy is critical. Developing ecotourism in areas with the promise of increased tourism and jobs, can in the end prove counterproductive when there is hotel development to support the tourism, work done to provide tourists with a "clean" experience (pristine white beaches, etc.), but a populace that does not fully benefit from the limited number of jobs that ecotourism can sometimes generate.

"'Holiday makers are mostly unaware of how their tourist paradises have been produced,' she says. 'They assume that the picture-perfect landscape or the silver Caribbean beach is a natural feature. This is very far from the truth. Tourist playgrounds are manufactured environments, usually cleared of people. Similarly, hotel construction in tropical areas can result in clearing ecologically important mangroves or beach building which harms coral reefs.'"

Duffy's thesis is that many conservation strategies are too optimistic and there certainly have been instances where the end results were not as anticipated for both, the environment and the community. So, I personally take what she says as more of a warning rather than an across-the-board indictment. Government, non-profit, and commercial organizations involved in conservation efforts - from reserves and protected areas to ecotourism - must be cognizant of how their efforts might inadvertently penalize subsistence-level groups which, in the long run, can undermine the success of the strategy. It's a challenge getting the balance just right between the interests of all.

The article is thought-provoking as I found myself both initially disagreeing with her position and yet taking stock of many conservation programs, checking to see if there could be roadblocks to their success down the road. I may even read her complete book, just to make sure I'm on my toes when it comes to analyzing and supporting the best conservation efforts.

Read the article in The Guardian.
Buy the book at Amazon.

Sharks Bite Back Without Biting: study finds deadly bacteria

With only a few days remaining before the start of Discovery Network's annual Shark Week, circulating through several news agencies (even Discovery's own Discovery News) is word of a new wrinkle in shark predatory behavior, a new weapon in its arsenal as it were: deadly bacteria.

Detailed in an article in the Journal of Zoo and Wildlife Medicine, a study was conducted by researchers who examined nearly 200 of seven different species of shark (and one species of redfish) from Martha's Vineyard in Massachusetts to the Florida Keys, the Louisiana coast, and south to Belize. Taking swab samples from the fishes' cloaca (its genital opening), strong evidence of deadly Staphylococcus and E. coli along with a host of other bacteria was found. These are bacteria that are life-threatening as they have become highly drug-resistant over the years - one of the side effects of man's extensive use (some might say overuse) of antibiotics.

Drug-resistant diseases and bacteria have been an issue with the medical community for some time, but here is a documented study showing transference of these microbes to fish. The question is: how did they get there?

As reported in Discovery News, one of the researchers, Jason Blackburn at Florida Atlantic University, has some theories. "Drugs given to humans could simply be excreted and eventually find their way into the ocean. Or bacteria in humans could acquire the resistance, be excreted, and then colonize fish that sharks eat, or the sharks, themselves. Some antibiotics are routinely dumped into aquaculture to help prevent infections -- that could be a source for some of the resistance."

The bacteria apparently is causing no harm to the sharks; perhaps the sharks are acting like host carriers, as occurs with other animals. But due to the drug-resistant nature of these bacteria, the potential for harm to man by casual contact or perhaps through eating raw meat can not be discounted. The research team plans on another study to investigate that aspect of the problem.

Today, we are learning more and more about the way in which pollutants like methylmercury and other toxic substances can work their way up through the food chain and often collect in surprisingly strong levels in many of the ocean's large predators including sharks, tuna, dolphins and more.

"You don't expect to see multi drug resistance from these animals because they shouldn't be exposed to antibiotics," said Adam Schaefer, a co-researcher involved in the study. "These animals are at the top of the food chain; they reflect everything that's going on beneath them."

When I dive with sharks, I'm less concerned with their teeth than with their overall attitude and posturing. Looks like now I'll have to check to see if their running a temperature.

Read an abstract from the study in the Journal of Zoo and Wildlife Medicine.
Read the article from Discovery News.

Shark Physiology: shark tournaments provide researchers with specimens and a moral dilemma

For marine biologists to better conserve and protect the creatures of the sea, they must understand them - their behaviors, their lifestyles, their physiology. To understand them from the inside out means having access to specimens for dissection and this poses one of the great moral scientific dilemmas: having to catch and kill the very animal you hope to protect.

Can this be done responsibly? Are there animals whose internal structures have been studied enough? Are there others resources for specimens available? In many cases the answer is "yes" but not for all. Sharks are one example. There's still much that is unknown about the inner workings of these important predators, but sharks decompose quickly so sharks found dead in the wild are not ideal for study. The same can be said of sharks commercially caught as bycatch or, if commercially sought after, that are immediately processed.

An article in the Cape Cod Times caught my attention as it addressed this issue by examining how researchers use shark tournaments as a means to gain access to suitable shark specimens. The article details how researchers from NOAA and other universities take advantage of the large, mature sharks that are caught to make quick dissections of their internal organs for study. The article is accompanied by a video showing the researchers at work during Massachusetts's long-running (and notorious to many shark advocates) Monster Shark Tournament.

I found the article and video to be very disturbing. Disturbing because it plays to that scientific moral dilemma that many shark advocates just don't like to think about. And for good reason. A 200+ pound mako is hoisted by its tail and brought onto the dock. People are commenting about how beautiful it is with it's cobalt blue body and sleek shape. It pained me to see it.

A large crowd is gathered to watch the festivities of sharks being hauled in. Is there a macabre fascination in seeing the infamous malevolent predator hanging unceremoniously by its tail; a vindication that, in the end, man conquers all? Fishermen are making toasts to their trophies, hoping to gain rewards - sometimes financially sizable whether offered legally or otherwise - and brandishing justifications that the shark meat will be provided to those in need. I can just see the child of a low-income family calling out, "Momma, mako steaks tonight!" Oh boy, shark fin soup - a favorite of the projects! Right. I get angry even as I write this.

But then there is the other side of the argument. The researchers, who are unable to afford boats and crews to go on selective fishing expeditions, are at least afforded some sort of access to fresh specimens for study. Tournaments that set specific rules regarding species, size and weight (favoring older, more mature sharks) garner a measure of favorable PR by providing researchers with the opportunity to do on-site dissections.

"While scientists can get some sharks from fishermen who catch them while targeting other species or from research cruises, large, sexually mature sharks are mainly seen only at tournaments. [NOAA biologist Lisa] Natanson credits tournaments such as the one in Oak Bluffs for welcoming researchers and for encouraging fishermen to land only large animals. Penalties are assessed for landed sharks that are under the weight limit, which is between 200 and 250 pounds, depending on the species.

'Without these tournaments, we'd have to go out and hire a boat and kill them ourselves, and that would be expensive,' said Greg Skomal, the state Division of Marine Fisheries' shark expert. Tournaments also offer college students the chance to do research necessary for advanced degrees. Skomal did his thesis on blue sharks with information gathered at shark contests."

Taking stomachs, intestines, livers, and other tissue samples, there have been some telling results ranging from parasites to diseases. As an example, the Cape Cod Times article sites three forms of cancer that have been found in adult shark specimens.

Shark advocates take note: CANCER HAS BEEN FOUND IN SHARKS, which debunks the belief that sharks resist cancer - one of the foundations behind the demand for shark products as homeopathic cures.

But still, I am troubled. There has got to be a better way. I support the efforts of organizations like the Shark Free Marinas Initiative, which gets marinas to cooperate by banning sharks from their docks and promote catch-and-release techniques. And researchers have taken advantage of catch-and-release tournaments to take blood and tissue samples, and tag sharks with transmitters before the shark is released at sea. Recognizing that an outright ban of all shark fishing is unlikely, the Shark Free Marinas Initiative is taking an important incremental step forward and away from senseless slaughter for the sake of a trophy kill.

However, for scientists, the need for whole specimens for dissection is still there, as we are continually learning more and more about these important but threatened ocean animals. It is a dilemma that is not lost on the scientists, as they have ambivalent feelings, too.

"While she [University of Hartford biology professor, Joanna Borucinska] appreciates the information she is able to glean from tournaments, Borucinska said she would not be saddened if they went away. The crowd cheered when a big thresher shark was hoisted overhead. But the sight brought her no cheer.

'I never get excited (about seeing a shark on display), especially a big one,' she said. 'I get sad.'"

Professor, you're not the only one.

Click here to read the Cape Cod Times article and watch the video.

Filmmaker's Journal: guest posting on Oceans4Ever's "Summer Sharktakular"

It's been said that the future belongs to the young. If so, then here is an example of hope: ten-year old Alexa, with the help of her mother, Cindy, have established the blog Oceans4Ever. It succeeds in bringing important issues to light without hyper-opinionated rants and complex scientific jargon. Just straightforward talk from the perspective of someone who is living with the world we adults have given her, warts and all.

Right now Alexa is running a Summer Sharktakular with contests along with information and guests posts from a wide range of sources. I was asked to contribute a guest post about shark filmmaking and I was most pleased and honored to oblige. I addressed the responsibility that the nature filmmaker has towards getting the story right when it comes to sharks:

"... the truth is that sharks are predators and scavengers – extremely important predators and scavengers that help maintain the proper balance and health of the marine ecology.

The oceans cannot survive without them.

The message I try to convey to my audience is: you may not love them, but you must appreciate them. You can’t enjoy the jackrabbit or the deer without appreciating the coyote or the wolf. And you can’t enjoy the colorful reef fish or the comical seals without appreciating the shark."

My hat's off to Alexa and Cindy for Oceans4Ever! We are standing very close to a precipice but its because of the efforts of young people like Alexa that, in that perilous moment, we might spare ourselves that long fall.

"Shark films can be exciting, they can be entertaining, but they must be on-target. We owe it to the sharks; we owe it to ourselves – for our futures are intertwined."

Check out the Ocean4Ever blog.

New Finds in Newfoundland: discoveries in cold Canadian depths

One often thinks of near-Arctic waters as not a likely environment for corals and sponges - or for much else for that matter. And if it's deep, when we think of life, we think of thermal vents and the temperatures and nutrients that spawn unusual species.

And yet, scientists and researchers from the Canadian Fisheries Department, Canadian and Spanish universities have discovered new coral and sponge species off the coast of Newfoundland - species whose coloration and beauty would befit a tropical reef.

Using a robotic submersible (ROV), the researchers plumbed the depths as deep as 9,800 feet (3 km) in an area protected by the North Atlantic Fisheries Organization. At these deep depths, species of coral, like gorgonian sea fans, grow extremely large (over 3 feet in height) and provide shelter for sealife and even protection from currents - much like trees.

As reported in the Montreal Gazette, according to Fisheries Department scientist Ellen Kenchington, “It’s a similar function a tree would serve in the forest, cutting down wind, providing branches for birds. We have the same type of communities that take shelter down there.”

As the researchers continue their work for the next few weeks, they will be assessing the condition of this protected area to determine whether additional sanctions are needed in other areas to better insure that populations of commercial fish remain at sustainable levels.

Click here to view a slide presentation of fascinating deep sea creatures.

Read article in Montreal Gazette. Photos by HANDOUT, Fisheries and Oceans Canada.

Earth Lashes Out At the Sea: terrestrial fungi can strike ocean reefs

Here's an interesting post from the Southern Fried Science blog - a blog consisting of a trio of dedicated grad students from the U.S. Carolinas. Described in this post is a type of fungus that raised havoc in the coral reefs of the Florida Keys in the late 90's. Acting like a brush fire that thins out a forest, this fungus spawned diseases that cleared out mature coral sea fans, allowing young coral with greater disease resistance to take hold.

This would seem like a natural cyclical disaster that nature could handle - much like the forest fires started by lightning. But this was a terrestrial fungus brought in by wind-borne dust from faraway continents and could also be brought in by ships or more frequent storms due to man-made climate change. So, while nature has an incredible ability to, in time, balance out the the impacts of natural disasters; mankind can accelerate those factors beyond what nature's ecosystems can handle.

Alien Invaders: coral pathogens

By Southern Fried Scientist, on July 20th, 2010

It was a story that could very easily have been written as science fiction. Gorgonian (sea fan) corals of the Florida coast were turning black and dying. The infectious culprit was something no one working on the reefs had encountered before. It was totally alien. The black rot spread across the Caribbean, decimating coral populations. By the time the contagion had been deduced, more than 50% of total sea fan tissue had been eradicated in the Florida Keys. It was one of the worst coral epidemics in recent history.

The culprit was indeed an alien, though certainly not extra-terrestrial. In fact, it was very terrestrial. Aspergillus sydowii, a globally distributed saprophytic soil fungus was the nightmare creature. Aspergillus causes a variety of diseases in humans and birds, but had not previously been recognized as a marine pathogen.

The coral epidemic lasted six years, beginning in 1997. Not surprisingly, it targeted larger, mature corals, severely reducing their biomass and impairing reproduction. Because of this predilection, the total population of gorgonia remained stable, thanks to the influx of juvenile corals from other sources. Eventually, the disease epidemic subsided, due largely to increased host resistance, but also due to the decline in large corals.

How Aspergillus was introduced into the ocean is no surprise. Fungi are prolific in their spore production and dispersal. For every cubic meter of air, there are more than 10,000 fungal spores. That’s a lot of opportunity to take hold. But there is a concept called the mycostatic effect in marine mycology. Simply put, most fungal spores do not germinate in the sea. The osmotic pressure of saltwater prevents most fungal spores from functioning. So, though prolific in numbers in the sea, fungi are not often seen as having a large ecologic contribution.

At least, that’s the conventional wisdom.

Recently other reports of fungal infection in the ocean have appeared. In the Fiji Basin anther black yeast, those this one uncharacterized, has infected mussels at a deep sea hydrothermal vent. These mussels grow black and eventually die. More then 60% of the mussels at one site were infected. How the disease spreads, and how it was transmitted to the deep sea remains a mystery.

Fungi were one of the first to colonize land, and I have a bit of a history of that event here. Only the most basal fungal forms are known to thrive in aqueous environments. So how do these more derived forms return to the sea?

The final chapter (or first chapter? I’m still getting a handle on this whole narative thing) is one that is a common thread in modern ecology. Fungal spores identical to those of the infectious Aspergillus were isolated in the Virgin Islands from layers laid down by dust storm events. These dust storm events originated on the African Coast and carried spores across the Atlantic to settle in the Caribbean. An organism of little notice (though very significant ecology) becomes a pathogen when introduced into a new environment.

We live in a global ecosystem. What happens to one place, no matter how seemingly remote, happens to us all.

~Southern Fried Scientist

From Southern Fried Science.com.

Jumbo Squid in Oxygen-Poor Zones: new study shows ability to expand territory and evade predation

New research adds further insight into the ability for the Humboldt, or jumbo, squid to expand its territory and become even more of a destabilizing predatory influence along the coast of the Eastern Pacific. In the latest issue of Progress in Oceanography, researchers from the University of Lisbon, Portugal, and the University of Rhode Island, U.S., studied the squid's metabolic rates in water with different oxygen levels - duplicating the oxygen-poor environment found in waters several hundred meters deep and also the oxygen-rich environment of relatively shallower depths.

Dr. Ruis Posa, of Portugal's Center for Oceanography, posed the question, "Jumbo squid display oxygen consumption rates that are among the highest in the oceans. This high energy demand reflects the low efficiency of jet propulsion. So the question is how can they survive in these deep, cold and oxygen depleted zones?"

According to Dr. Rosa, from Portugal's Center of Oceanography, the squid displayed the ability to shut down its metabolism by as much as 80% in the oxygen minimum layer (OML). This enables the squid to find a safe haven during the day beyond the reach of many of its predators. During the night, the squid rejuvenates itself in shallower waters where its metabolic demands increase dramatically as it hunts for food using its jet propelled speed coupled with tentacles laced with tooth-lined suction disks.

As mankind continues to alter the marine environment, we are finding more and more areas of lower-than-normal or even near-depleted oxygen levels in the oceans, thereby providing the voracious Humboldt squid with the capability of expanding its range. An animal's territorial range can be maintained by a variety of factors, some of which are based on the quality of its environment and on the predators that help keep the population in check. With this newly studied metabolic ability, the Humboldt squid can utilize spreading OMLs to its advantage, avoiding predators during the day and causing havoc amongst commercially fished species at night.

Read the study in Progress in Oceanography. Read more about the study in BBC News. Watch video below from Google Earth/Ocean.

Filmmaker's Journal: Shark Diver - the Movie

This past December, I had the pleasure of working on a film project that was the brainchild of marine biologist Luke Tipple and his director/brother Mark Tipple. It was to be the pilot episode of a proposed series titled Shark Diver. In this opening segment, it sets the stage for a series of worldwide shark encounters with Luke as the central figure, supported by a cast that includes an investigative reporter, a zen-like scuba master, and more. I was on board as Director of Underwater Photography and topside "B" camera operator.

The end result is a very entertaining piece that sets the stage for more adventures while also providing an important insight into shark ecotourism, research, and conservation.

The production company, What We Do Media, has set up a web site where you can view the pilot episode or order an HD-quality download or DVD. It's a different twist on providing both entertainment and education, so check it out.

View or download the film at SharkDiverMovie.com.