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    Spirits From The Vasty Deep
    By Danna Staaf | December 7th 2010 02:07 PM | 5 comments | Print | E-mail | Track Comments
    About Danna

    Cephalopods have been rocking my world since I was in grade school. I pursued them through a BA in marine biology at the University of California...

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    Back in October I wrote on the subject of the Kraken, stating rather emphatically and cantankerously that
    whales eat squid. It is a unidirectional ecological interaction.
    I received a very thoughtful response from one Daniel Rolph, who commented
    I'm familar with 'whales eating squids,' and the discovery of 'beaks' of squids in their gullets, but I'm also curious about the statement made by the late biologist, Ivan T. Sanderson, who wrote among his many volumes, one entitled, 'FOLLOW THE WHALE,' which was all about the 'sperm whale.' He mentions the evidence of finding on sperm whales, huge 'circular sucker marks' of squids who'd fought the whales which were later caught, scars 18 inches across, implying a squid of 100's of feet in size (and not scars that had 'enlarged over time by the growth of the whale), but proof of actual conflicts between truly 'colossal squids' and sperm whales in the ocean's depth.

    This, in turn, reminded me of the conclusion of Richard Ellis' The Search for the Giant Squid.
    Have I been too quick to dismiss the unmeasured giants? . . . Perhaps, instead of categorically clinging to the closed system I have worked so hard to establish, I ought to end this book with an open mind. Maybe there are bigger giant squid out there, and maybe people have actually seen them. That they haven't been measured may not be all that important anyway. Can we dismiss every account that doesn't fall within our established guidelines?
    I do agree that the vasty deep may still hold marvels well beyond our current imaginings, and 'tis important to remember this! However, though there is still a great deal we don't know about the deep sea, it is possible to make certain educated guesses. And as Ellis points out,
    I'm only willing to include the 100-footers in this amendement; a 150- or 200-foot long monster would have a very difficult time finding enough food to keep it going and is still, I believe, in the realm of fantasy.
    That there may be much larger squid than science currently reports, I'll readily concede. But that these squid, no matter how large, may actually attack and consume whales, I find nearly impossible to imagine.

    I have outlined the reasons why squid, particularly the human-sized Humboldt squid, are extremely unlikely to kill and eat humans. I believe the same reasoning ought to apply to the likelihood of whale-sized squid killing and eating whales.

    However, it's quite likely that enormous squid could inflict real damage on their predators while they struggle to escape--just as a zebra may get in a lucky kick, and break a lion's teeth. I just don't think any squid it its right mind would try to tangle with a whale on purpose.

    The title, of course, is from King Henry IV, Part 1, Act 3 Scene I:

    GLENDOWER
             I can call spirits from the vasty deep.

    HOTSPUR
             Why, so can I, or so can any man;

             But will they come when you do call for them?

    Comments

    Aitch
    Here's a sad story about the effects of overfishing, and its impact on giant squid http://www.youtube.com/watch?v=aeG8rHuCIDQ&feature=player_embedded Aitch
    Danna Staaf
    Wow, I hadn't seen that. Thanks for the link!
    Have you seen that picture on youtube about a squid attacking and killing a shark in an aquarium? It did so by gripping its jaws and fins, so it couldn't move anymore. As you know, sharks have to keep on swimming to keep oxygen flowing through their gills. So, after a short minute, the shark just suffocated and lost all strength. A spermwhale can dive very well and long, but has to go up to breathe after some time. If the octopusses arms are long enough to embrace the whole whale, it can prevent the whale from going up, thus loosing it's strength and suffocating. Only after that can the squid use its little beak, if it wants to.
    Amazingly, the octopus that killed the shark(s), according to the commentary to the movie, did not do this to eat it, but to prevent from being eaten. So the octopus had a strategic intention!

    Danna Staaf
    Yep, that happened at the Seattle Aquarium. Amazing footage! Scaling this giant pacific octopus vs. dogfish interaction up to giant squid vs. sperm whale is an intriguing idea, for sure. Here are a couple of key differences:

    - The octopus&sharks were enclosed together in a relatively small space. Any interaction seen in an aquarium must be taken with a grain of salt when you start considering whether it could happen in the wild.

    - The size of the octopus relative to the shark was much greater than the size of any known squid relative to sperm whales. The octopus' arms were wrapped multiple times around the shark's body!

    - The octopus was able to catch the shark because it was employing a sit-and-wait hunting strategy, hiding until its prey swims past. Squid, unlike octopuses, aren't sit-and-wait predators, and even if they were, there's nowhere for them to hide in the middle of the open ocean. They'd have a hard time surprising a sperm whale.

    - Finally, as for the assertion that the octopus killed the shark in order to protect itself, remember that you can't believe everything you hear on video commentary! Here's a bit more thorough journalism, pointing out, among other things, that the famous viral video was staged (although the interaction itself was real and repeatable.)
    Frequently, aquarium workers would arrive in the morning to see the remains right in front of the viewing windows. The middle of the dogfish carcasses were completely eaten down to the bones, but the head and tail were intact.
    Sounds like predation, not protection, to me!
    Steve Davis
    That's a wonderful quote from Shakespeare Danna, or was it Lewontin?! Doesn't really matter.