Isis checking out the Beebe Vent Field. Or Piccard, if you drive on the right side of the road.
I’d like to introduce you to a new series I’ve been working on called “Conservation Conversations”. Each discussion, which will take place first on twitter, will focus on a particular marine conservation issue. I will then Storify and share selected responses here on the blog, allowing the conversation to continue.
The first conservation conversation focused on sustainable seafood. A new paper showed that many fisheries scientists and conservationists believe that the Marine Stewardship Council’s “sustainable seafood” certification process is too lenient, a topic I’ve written about before. I wanted to know how my twitter followers decide what seafood is sustainable. I also asked whether they choose to avoid seafood entirely or focus on sustainable seafood.
We actually watched an Oceanic White-tip take several lunges at the ROV Isis on her way down. Sadly, she was only visible on the umbilical camera (a low-res upward facing camera we use to watch the status of the ROV’s tether), which we don’t record.
One of the great traditions among deep-sea scientists is the shrinking of polystyrene cups by sending them down to our research sites. Polystyrene (or Styrofoam) is mostly empty space. When sent to the bottom of the sea, the massive pressure (an additional atmosphere for every 10 meters depths) squeezes the air out of these empty spaces reducing the cups–or, in some more dramatic examples, mannequin heads and prop skulls a la Hamlet–to a fraction of their former size. With a little bit of creative doodling during down time, we end up with a nice illustration of this physical phenomenon that is undoubtedly an insufficient gift for our loved ones, of whom we’ve abandoned to spend 30+ days mucking about on a boat*.
Fortunately, on my last expedition, I had the wherewithal to get before and after photographs of each cup the went over the side. So, for your enjoyment, for the next few weeks I’ll be posting some of my favorite shrunken cups. Enjoy!
*Though, it could be worse. Rumor has it one group of researchers was so confident in their ability to deploy and recover remote deep-sea landers, that they all affixed their wedding rings to the deepest rig before sending it over. Fortunately, it returned, rings unscathed.
No, I don’t mean that there’s only one species of giant squid, Architeuthis dux, as was recently revealed by marine science rising star Inger Winkelmann, although it’s true. I mean that there is only one individual Archituethis dux, her name must naturally be Ducky, and, for the last 3 decades, she’s been messing with us.
Let us review the evidence:
As you may have noticed from the previous post, the Atlantic States Marine Fisheries Commission (ASMFC) is proposing draft addendum to the Fishery Management Plan (FMP) for coastal sharks to bring it in line with the current Federal regulations. These regulations are based on the Shark Conservation Act of 2010, which required all sharks fished in US waters to be landed with fins still attached… with the exception of a familiar yet under-studied species known as Mustelus canis, the smooth dogfish. These sharks can still be finned in Federal waters as long as the weight of fins does not exceed 12% of the weight of the finless carcasses. This exception was glaring not just because it singled out one species with a relatively limited range compared to other species in the fishery, but also brought out that seemingly absurd 12% fin-body weight ratio. The addendum is open for public comment until March 28th at 5 pm. With any luck, this post will help clarify some of the issues involved.
You know the good stuff is going to keep rolling in from my research cruise to Mid-Cayman Spreading Center. At the end of JC82, we had the opportunity to join a bolt-on cruise to explore the seabed around Montserrat. During a biological survey of the surrounding abyssal plain, we twice stumbled on a giant deep-sea isopods hanging out on the sea floor, doing their isopod thing. This was my first opportunity to observe a giant deep-sea isopod (Bathynomus giganteus*) alive and in the wild. My previous experiences have been limited to well preserved specimens.
Giant isopod behavior is not something that falls within my expertise. Like Craig McClain at Deep Sea News, I’m fascinated by the evolution of their large body size and how a relatively abundant population of such giants can be supported in the food limited deep benthos. But giant isopods are not common in my study area and what little I know of their behavior comes from the very few videos available, mostly of them scavenging on baited camera traps. So I was pretty surprised when the ROV Isis came across this delightful giant maintaining its burrow.
This isn’t the first time Bathynomus burrowing has been observed; the behavior is actually fairly well documented (at least, well-documented for deep-sea species). But as fascinating as watching a 20+ centimeter-long roly-poly digging it’s hole 800 meters deep on the seafloor near one of the most active volcanoes in the Caribbean is, what we found next was even more amazing: