-Dr. Malcolm Gordon
Quote of the day on my students’ blog! Check out their adventures as they do their research projects out at Catalina: MBQ 2014.
-Dr. Malcolm Gordon
Quote of the day on my students’ blog! Check out their adventures as they do their research projects out at Catalina: MBQ 2014.
Contests that challenge young scientists to explain their research without jargon are turning science communication into a competitive sport.
Early on, organizers of such science communication competitions say they faced skepticism from faculty, many of whom were concerned that a contest would denigrate serious research. But CIRM’s McCormack refutes the idea that making science easier to digest cheapens it in any way. “Just because you’re simplifying it doesn’t mean you’re dumbing it down,” he says. “You’re just making it accessible. I don’t think it trivializes it at all. In fact, in many ways, I think it raises it.”
I completely agree. Explaining science in a straightforward, accessible fashion doesn’t necessitate dumbing it down. TED Talks are an excellent example of this. The presenters bring complex topics to curious audiences in engaging ways and their popularity is a testament to the success of such a format. More and better science communication can only serve to benefit both science and the public.
Via deepseafauna with googly eyes:
Do you prefer the biologically accurate googly-eyes at the terminus of each arm…
…or the more whimsical pareidoliaic face?
[Photo by Ed Bowlby, WoRDSS.]
I, personally, am going to have to go with biologically accurate, although I do think googly eyes improve anything and everything.
But wait, you say, hold the phone. I can see that sea stars don’t have two eyes in the middle — “Correct!” I interject — but they definitely don’t have eyes on the ends of their… legs? Arms? What are those? (Arms.)
Ah, well, how am I going to put this. It turns out, sea stars actually do have eyes there. Tiny, structures that hold clusters of light-sensitive photoreceptors sit at the end of each arm, giving sea stars some rudimentary vision.
It begs the question, however, why would a sea star need to see? They’re not exactly speedy, so the sight of a predator swimming straight at them won’t send them racing away. (They’re not cartwheelingspiders, after all.) While the exact behavioral use of their eyes is still open to speculation, it’s quite likely they use their vision for rudimentary navigation.
A recent study looking at the vision and behavior of sea stars supports this hypothesis. Published in the Proceedings of the Royal Society B earlier this year, the study investigated the small-scale navigation and the eye function and physiology of the blue sea star, Linckia laevigata, a tropical species that makes its home on coral reefs.
In addition to exploring their eyes’ spectral sensitivity and resolution, the researchers, Anders Garm from the University of Copenhagen and Dan-Eric Nilsson from Lund University, found that normal Linckia sea stars were able to navigate back to the reef when placed up to 2 meters away, while experimentally blinded starfish were unable to find their way back. Pretty stunning for an animal with no advanced eyes and a simple nervous system.
This new information just adds to the fray that is our understanding of echinoderm vision. Echinoderms, an invertebrate phylum closely related to vertebrates, include sea urchins, brittle stars, basket stars, feather stars, crinoids, sea cucumbers, and our noble, sighted sea stars. Though several of these animals sport rudimentary vision and the odd pair of rogue googly eyes, none of them have eyes nearly as advanced as vertebrates. Still, as close invertebrate relatives, the development of echinoderm eyes may hold some clues for the development and evolution of our own.
Spend a lot of time out on the water and interested in getting involved in some citizen science? You can help marine scientists track global phytoplankton productivity… with your phone.
Marine biologists have been using the Secchi disk method to measure the abundance of phytoplankton for 150 years.
The white disk measures 30cm (1ft) in diameter and is lowered into the water on the end of a tape measure. When it is no longer visible from the surface, the reading – known as the Secchi depth – is recorded.
“It is a very robust method and not prone to error and it is a good measure of phytoplankton abundance,” Dr Kirby told BBC News.
“Away from estuaries and more than a kilometre from the coast, the main influence on water clarity is phytoplankton.”
He explained how he had the idea of setting up a citizen science project: “It occurred to me sat at my desk that while there are a lot of scientists, there are not that many that are marine scientists, and fewer still that go to sea.
“And the ones that do go to sea do not go out very far. If they do go out far, they rarely go back to the same place.
“I thought that there are an awful lot of sailors out there; day sailors, cruising sailors. Many of these sailors will sail the same waters and take the same route time and time again.”
The full article tells you how to get involved and provides this interesting, surprisingly Papal history of the Secchi Disk:
The Secchi disk, invented in 1865 by Angelo Secchi – the Pope’s astronomer – is a circular disk that is used to measure water transparency in oceans and lakes.
The concept had long been used as a navigational tool by sailors. By lowering a dinner plate beneath the waves and measuring the depth it disappeared, it provided the crew with an indication of what ocean current they were currently sailing through.
Fr Secchi was asked by the head of the Papal Navy to measure the transparency in the Mediterranean Sea. This task gave rise to the formalised measuring system.
Ever since the first measurement was taken aboard the Papal yacht in April 1865, marine biologists have used it to measure phytoplankton abundance.
So maybe all you need is a dinner plate, a tape measure, and your phone. Bon voyage!(Pro tip: don’t drop your phone in the ocean. You’re welcome.)
Bear with me! In the meantime, enjoy this cheerleader crab. They grasp tiny anemones with their chelipeds (aka claws) and wave them around in the water like pom poms. The anemones catch food like tiny zooplankton and then the crabs then use their mouthparts to clean the zooplankton off the anemones’ tentacles. I guess it’s kind of like using a living fork!
Those of you who know me well know I love to complain and rant. A friend told me about this recent story, and the fisherman quoted in the article immediately put me in high dudgeon:
A group of fishermen hauled in a 12-foot-long, 1,300-plus-pound shortfin mako shark Monday off the coast of Huntington Beach that KTLA reported could be a record-setting catch.
Jason Johnston from Mesquite, Texas, said his group hooked the shark about 15 miles offshore. It took more than two hours and a quarter-mile of line to reel it in, he said.
“It’s unreal. This thing is definitely a killing machine,” Johnston said. “Any wrong step and I could have went out of the boat and to the bottom of the ocean.”
The shark was being taken to a weigh yard in Gardena to be certified by a weigh master. It was expected to be donated to a research organization for study.
As his group waited to hear whether the shark was indeed a record breaker, Johnston said the fishermen planned to hit the water again Tuesday.
*Looooong sigh* “Killing machine”, you say? It could have pulled you out of your boat while it was trying to escape being killed by you? I’m so sorry. See this tiny violin? I’m playing it just for you. Boasting about catching the biggest mako just seems to me like you’re boasting about killing the biggest tiger ever. (And then calling it a “killing machine” for growling when you shot it.)
Sharks get a bad rap, I recognize that. Ask anyone for the first word that comes to mind when they think of sharks and you get the answer of “Jaws”.
However, there are a lot of other things out there more likely to kill you. Dying in a traffic collision, for example, carries a lifetime risk of 1 in 83 (compared with a 1 in 60,453 lifetime risk for death by shark attack, source: NYT), but you don’t hear people say “That’s why I don’t go near roads” the way you hear people say “That’s why I don’t go in the ocean” after any shark news. You’re actually more likely to be bitten by a stranger on the subway than killed by a shark, which is news I think should really scare us all.
Things start to look even worse when you compare how many people are killed by sharks with how many sharks are killed by people each year: on average, it’s only 6 people versus an estimated 100,000,000 sharks. Do the math and it comes out to around 11,000 sharks per hour; on the other hand, 2011, a record year, saw a grand total of 12 human fatalities. Joe Chernov and Robin Richards made this incredible infographic to demonstrate (via HuffPo):
Sweet mother of pearl.
Admittedly, cold hard numbers can only sway opinion so much. Fearing sharks is an emotional reaction, and fearing animals that could hurt you is really not that unreasonable. Sharks just need better PR. Consider instead, how you might feel about sharks if they had a different marketing crew working for them:
1) Braving all the odds, the rough patches, and (especially) winters of discontent, you and your mate are intensely bonded. This bond doesn’t change when kids enter the picture, but your extreme commitment to providing the absolute best for your little one and two Type A personalities mean you don’t actually get to see each other that much anymore. In fact, a few days in between grueling 6 month stints of child care or work is it, really. That’s ok with you, though. Anything for the advancement of the species.
You and your lover are… Emperor Penguins.
2) You felt adrift in a lonely ocean, telling yourself there must be someone out there just for you, and you were just about to give up when one day, he sidled up to you. He’s nice enough, you get along, and you can just really spend lots of time together without getting in fights or bugging each other or anything… that has to mean something, right?
Ultimately, he became intensely attached to you, reduced in size, and parasitic, to the point of the fusing of his circulatory system with yours. Even though he never leaves the house you at least don’t have to worry about him running off with someone else.
You and your lover are… Anglerfish.
3) “Fun in the sun!” and “Party Time!” and “Somewhere it’s 5 o’clock…” and “Where do I put this?” are all things you can be found shouting with glee while gettin’ your drink on. In fact, four phrases means there’s not only room for four, but plenty of room for more. Like one big conga line, you and the rest form long, copulatory chains, dispersing pheromones (…drink specials flyers?) into the area to let everyone else know what’s going on and that they can join in. When it’s all over, you lay some spaghetti-like eggs and go back to eating. Yum. Brunch time!
You and your lover(s) are… Sea Hares.
4) You don’t need anybody and no one has anything on you. That’s how you like it. No muss, no fuss, no strings, no cohabitation. You have your bachelor pad, your space, your little walled castle and that’s all you need. “I am a Rock” is your favorite Simon & Garfunkel song.
That being said, every guy has his needs, so when the time is right you don’t venture far from home. You don’t venture from home at all, actually, sticking your penis into your neighbors’ houses to get it on.
You are a… Barnacle.
A couple of my favorites, which I hope to use with my students this winter.
I have a question for you: What do you use to see? Your eyes?
PFFT. SO mainstream, says hipster sea urchin.
Hipster cat agrees.Sea urchins don’t have eyes. Closely related sea stars have simple eye-spots at the end of their arms, but sea urchins lack these rudimentary structures. Ever tried to reach over and grab a sea urchin from a tidepool only to find it’s holding onto the rock tightly? The little bugger saw you coming.
Clearly, urchins exhibit phototaxis, which means they move in response to light. An organism that moves toward a light source would be said to be positively phototactic, while one that moves away from a light source would be considered to be negatively phototactic.
Despite the number of other environmental factors (salinity, temperature, dissolved oxygen, and water flow to name a few) that urchins can use to sense and navigate their habitats, having some level of sightedness is obviously useful. Recent research shows that urchins not only are generally phototactic, but they can kind of, well, see with their skin. Take it away, National Geographic:
Previous genetic analysis of the California purple sea urchin had revealed that the animals possess a large number of genes linked with the development of the retina—the light-sensitive tissue lining the inner eyeball in people and other vertebrates.
This and other research suggested that sea urchin vision might rely on light-receptor cells randomly scattered across their skin, which collectively function like retinas.
There’s also this great little tidbit from some researchers who tested the urchins by placing them in well-lit tanks with different sized disks:
“The urchins were really fussy to deal with. Some just wouldn’t move, like deer in headlights … if you can imagine a deer as a spiked ball,” Johnsen said. “But I guess for them it was a bit like being in a Twilight Zone episode, just being stuck in a featureless, well-lit room.”
Sea urchins compare the light they detect with their tube feet and spines to sense what is around them. So there you have it: body eye. A decentralized approach to vision that gives the little sea pincushions sight comparable to that of nautiluses and horseshoe crabs, which is to say, relatively good.
Let’s take a look at a few pictures of sea urchins waving their visual tube feet and spines around. (Click to view larger versions on the original website. Seriously, you should do it. These thumbnails don’t do them any justice.)This beautiful illustration shows even more explicitly the purple sea urchin’s tube feet waving around, helping it move across the substrate and holding onto a piece of algae (for camoflauge or for fun, we’re not really sure yet). Oh yeah, AND SEEING. Needless to say, it’s a pretty cool discovery and challenges most preconceptions of how sight functions.
“We think of animals that have a head with centralized nervous systems and all their sense organs on top as being the ones capable of sophisticated behavior, but we’re finding more and more some animals can do pretty complex behaviors using a completely different style,” Johnsen said. [Science on NBCNews]
And that is why sea urchins are cooler than you thought. Now try fitting a pair of Wayfarers on that.
We saw some really cool things snorkeling last weekend, although not many fish — I was too excited checking out the animals living in the rocky areas where was the kelp was attached. I did see some huge sea urchins and even a couple nudibranchs! Very fun. While you wait patiently for another snorkeling adventure, enjoy this wonderful video about creepy sea animals from the utterly charming and informative Fake Month At The Museum:
He had, under his arm, what might appear to be a clunky toy blue submarine about the size of a lunchbox. The machine is the latest prototype of the OpenROV–an open-source, remotely operated vehicle that could map the cave in 3D using software from Autodesk and collect water in places too tight for a diver to go. It could change the future of ocean exploration. For now, it is exploring caves because it can only go down 100 meters. But it holds promise because it is cheap, links to a laptop, and is available to a large number of researchers for experimentation. Indeed, the OpenROV team hopes to start taking orders for OpenROV kits on the crowd sourced project site, Kickstarter. Going for $750, the kits include laser cut plastic parts and all the electronics necessary to build an OpenROV. (Users will have to bring their own laptops to view the onboard video feed and control the machine. They’ll also have to supply their own C-cell batteries which power the sub.) The subs are expected to be available by the end of summer.