Cephlapod Camouflage: now you see them, now you don't

Here's some visual fun. Cephlapods - squid, octopus, and cuttlefish - have incredible color-changing capabilities. Add to that, the ability of the octopus and the cuttlefish to change the texture of their skin and you have some remarkable displays of camouflage.

Below is a great short video from Science Friday, originally put out by the educational arm of the Woods Hole Oceanographic Institution. The actual footage was shot over a decade ago by marine biologist Roger Hanlon and I have seen it in other Woods Hole presentations over the years, but it never loses the fascination it generates with the viewer.

Not only is it amazing to watch but it's also mysterious - scientists to this day are still trying to determine how these mollusks are able to do it. How can a colorblind octopus match its color to the surroundings so perfectly? What triggers the type of display the animal will use - a communicating color pattern, a camouflage pattern based on color or texture or both?

Aaah, the mysteries of the deep. . .

Whales and Sonar: Woods Hole research proves changes in behavior

The long-standing controversy over the effect of sonar signals on whales has festered over the years primarily due to that fact that the whale's supposed adverse reaction to the electronics sounds was theorized, implied, but never definitively proven. All evidence was anecdotal.

The Woods Hole Oceanographic Institution has changed all that with a recently published study in PLoS One. Here is an overview from SeaWeb on this important research:

Whales Change Behavior to Avoid Navy Sonar

Friedlaender" height="167" width="250"> By studying whales fitted with electronic tags, researchers have been able to ascertain that beaked whales alter their behavior in response to naval sonar. Friedlaender, U.S. Navy

Researchers from the Woods Hole Oceanographic Institution (WHOI) have become the first to conclude definitively that naval sonar affects whale behavior and movement. This follows years of anecdotal evidence linking naval exercises with mass strandings of several species of cetaceans. The research team developed experiments to slowly increase the level of sonar directed at a tagged whale, to stop exposure as soon as the whale started responding, to measure that exposure and to define the response.

"These experiments were very difficult to develop, and it was a major breakthrough simply to be able to develop a study that could safely study these responses," said Peter Tyack of WHOI, the lead author of the study, which was published in the online open-access journal PLoS One. "All three times that tagged beaked whales were exposed experimentally to playback of sounds when they were foraging at depth, they stopped foraging prematurely and made unusually long and slow ascents to the surface, moving away from the sound."

The team then monitored reactions of beaked whales during actual sonar exercises on a naval testing range where an array of underwater microphones, or hydrophones, covered the seafloor, allowing whale sounds to be monitored over 600 square miles (1,554 square kilometers). "During actual sonar exercises, beaked whales were primarily detected near the periphery of the range, on average 10 miles (16 kilometers) away from the sonar transmissions. Once the exercise stopped, beaked whales gradually filled in the center of the range over 2 to 3 days," they write. In a press release, Tyack said that the research shows beaked whales are particularly sensitive to sound, and that they altered their behavior when exposed to sound levels below those previously believed. But, he added, "The observations on the naval range suggest that while sonar can disrupt the behavior of the whales, appropriate monitoring and management can reduce the risk of stranding."

Source: Tyack, P., et al. 2011. Beaked whales respond to simulated and actual navy sonar. PLoS One 6(2011): e17009; doi:10.1371/journal.pone.0017009.

Gulf Oil Spill: six months later - never forget

It is now six months since the Deepwater Horizon well in the Gulf of Mexico erupted into one of the greatest oil spill disasters of all time. Many news outlets and conservation organizations are taking a status check at this half-year mark, to see where the environment stands, what has happened, and what needs to be done both now and in the future.

But for many of us, we would like to sweep it all under the rug. The Gulf oil spill competed with the economy and politics for our attention a lot longer than many other news cycles, and with many of those other issues still remaining, most people just don't have the stomach for it anymore. It's human nature and I understand that; call it a defense mechanism, a means to cope by emotionally and intellectually moving on.

And it would be such a mistake to do so.

The long-term effects of this spill must not only be studied by scientific research organizations, but the results of those studies and their implications must be proactively distributed to the decision makers and the general populace. In other words, we must continue to have our nose rubbed in it. The Gulf marine ecology has been altered - subtly or radically. And by remembering that the environmental and economic effects of this spill will be with us for years if not decades, it could be the seminal event that finally signals a shift in our attitudes towards fossil fuels.

If there could have been any kind of silver lining to this dark petroleum cloud, it would have been that alternative energy sources would have received the support and backing they needed to push those technologies forward, making their use more effective, efficient, and affordable. But with the U.S. government's decision to lift the moratorium on the deep water drilling, there is a sense of returning to business as usual, albeit with a few more safeguards in place - but a critical, opportune moment may be passing.

So, pay attention to those organizations that are still studying, still observing the impact of wildlife, analyzing the impact on human health - from direct exposure to the oil or more indirectly, through the food chain. Lend them your ears and your support. Here are a few:

Using the Law
The Center for Biological Diversity (CBD) continues on the legal front with lawsuits to have the government check on tuna populations that were breeding in the Gulf at the time of the spill.
CBD also supported the Sea Turtle Restoration Project in their successful efforts to stop the burning of surface oil as it was killing sea turtles, burning them alive. And they continue to storm the gates of Washington to insure that environmental protection laws are rightfully enforced.

Studying Deep Water Impacts
Greenpeace has a research vessel and deep water submersible in the Gulf where they are conducting studies on the impact of the spill on deep water corals. A portion of the oil was thought to have settled to the bottom. If so, Greenpeace wants to determine what effect it may be having on deep water coral communities. Do entire reef communities of fish and crustaceans move on? And if so, how does that impact other marine communities beset by oil spill refugees?

Oil-Eating Microbes
The Woods Hole Oceanographic Institution has recently completed a study of the Gulf oil spill, verifying that there was a large oil plume that floated 3,000 feet below the surface. But they also determined that much of that plume was consumed by oil-eating microbes; more so than anticipated because of a high population of bacteria that has adapted to Gulf conditions. The researchers also found that the bacteria consumed less oxygen than expected, thereby diminishing the possibility of oxygen-free dead zones. All of which would be at least a relief, if not encouraging.

But the researchers still had plenty of questions and concerns as to what long-term effects all of this microbial activity could have on the Gulf ecosystem. Talking with Florida State University oceanographer Ian MacDonald, the PBS News Hour reported, "He cautions that many questions remain unanswered -- such as what has happened to the methane released into the water along with the oil, what percentage of the total oil released ended up in this deep-sea plume, and the environmental effects of changing the deep-sea microbial community."

Again, it's human nature to want to turn back the clock, to somehow take us back to when the waters were clear of oil, jobs were plentiful, and homes and credit were easily available. But if we succumb to that impulse, we are only setting up ourselves or the next generation for a repeat performance of what happened six months ago.

Never forget.

Read a six-month recap from the Center for Biological Diversity.
Read about Greenpeace's deep water coral research.
Read about Woods Hole's microbial research.

Seen & Unseen: Dave Gallo talks about some of the ocean's amazing ways

Here's just a little reminder - a fun one - as to why the ocean and all the animals that call it home need our support in conserving and protecting this vital environment. David Gallo, Director of Special Projects for the Woods Hole Oceanographic Institution, is a great speaker and puts on presentations that always leave the audience in awe and amazement. Here is a wonderful video clip from 2007 given at a TED meeting (TED is an interesting organization, dedicated to Technology, Entertainment, and Design - which means a wide range of fascinating speakers and subjects):

Bioluminescence in the greater depths and a cephlapod's camouflage through manipulation of skin color and texture - two of nature's fascinating ways it perpetuates life in the aquatic kingdom.

Sharks Win By A Nose: research details stereo olfactory ability

To be the efficient predators and scavengers that they are, sharks have an amazing array of sensory functions - from smell, sight, hearing/vibrations, to sensing electrical impulses. Working in coordination or in a sequence, these capabilities give sharks the edge to survive whether cruising an ocean reef or plying the wide open oceans hundreds of miles offshore.

Now, new research by the Woods Hole Oceanographic Institution (WHOI) and the University of South Florida shows how shark's sense of smell is even more refined than previously thought, by sniffing scents one nostril at a time - a sort of stereo smell-o-vision!

In a recent press release, WHOI researcher Jelle Atema said, “The structure of an odor plume is chaotic and not at all coherent. It’s just like what you see with the Gulf oil spill, which is essentially a gigantic odor plume. The plume breaks up into pieces, floats to different levels and gets transported in a current.”

By determining which nostril detects the odor first, the shark is able to determine a direction, much like our stereo hearing allows us to determine direction based on which ear detects a sound first or with greater intensity. The researchers confirmed this with tests using smooth dogfish, a small shark local to New England waters, and squid odor as an attractant.

But as Atema said, odors are transported rather haphazardly by currents, so sharks bring another sensory ability into play to help steer them in the right direction: the lateral line. This sensitive organ along a shark's body can detect faint vibrations in the water - vibrations like those given off by an injured fish or by the movement of water currents. Previous studies by Atema and fellow colleague Jayne Gardiner of the University of South Florida, showed that sharks use the lateral line to detect the direction of subtle currents - much like sensing wind on the hair of our bodies but with much, much greater sensitivity.

Combining these sensory abilities - stereo olfactory perception and lateral line vibrations - sharks are able to determine a direction and follow an odor to its source. “Inspired by odor, sharks also look for current,” Atema said. “The two together is what makes them so efficient.”

One more reason to look at sharks with awe and fascination and not ignorance or fear.

Read the Woods Hole press release.