Monday, December 8, 2014

Oh, Christmas Tree Worm, Oh, Christmas Tree Worm...

In honor of the season, today I present you with the beautiful, captivating Christmas Tree worm, Spirobranchus giganteus.


The colorful set of trees in this picture actually belong to a single, lowly worm. Yes, believe it: It's a worm. This diminutive annelid (same phylum as earthworms) is a marine organisms and those swirling "branches" or radioles are the paired tentacles it uses for capturing food from the water. The spiral "trees" also helps with gas exchange.

As divers and snorkerlers will tell you, when disturbed, these whorls instantly retract and the worm pulls its door-like operculum closed behind it. Here's a Youtube video of some Christmas tree worms retracting.

Christmas tree worms take their common name from their appearance, of course. Their scientific classification tells us lots more about these animals. As annelids, they have segmented bodies. Segmentation was an important evolutionary step that allowed greater diversity in organisms' body plans. Digestive tracts could differentiate into separate parts, each with its own role: mouth and esophagus to bring food in and move it through the passage, crops, gizzards, and stomachs to store, grind and process food, intestines to absorb nutrients and water. Segmentation also lets organisms develop differentiated limbs. We see segmentation in humans through our vertebrae. Turns out, all organisms that exhibit segmentation share a similar gene, the Homeobox, or Hox gene, which serves as a molecular architect and directs the building of bodies according to definite detailed plans.

Our annelid, the Christmas Tree worm, belongs to the class of marine worms called polychaetes (along with fireworms), subclass sedentaria (along with feather duster worms, because they once the larvae settle, they secrete a parchment-like calcareous tube and then never move from that location), family serpulidae (this means creeping and probably refers to the larval stage. When ready to settle down, the larva creeps around a potential home in search of a good place to dig in.)


Spirobranchus come in a variety of bright colors, each worm with two "trees" poking out from its tube. Most often, they burrow into living coral, although sometimes they'll live in a rock or sponge, and secrete their tube.

S. giganteus possesses a complete digestive system and has a well-developed closed circulatory system. Like other annelids, they possess well-developed nervous systems with a central brain. They have fully developed nephridia simple kidneys) used for excretion. When they reproduce, they simply shed their gametes (eggs and spermatozoa) straight into the water and leave fertilization to chance and cooperative currents.

Christmas tree worms eat by capturing food from the plankton. "Capturing" sounds a bit more active than it really is. When currents carry tiny plants and animals floating in the water into the radiole, the tentacles direct that particle to the worms mouth. They don't really hunt anything down. Filter feeders wait for the food to come to them. They have few, if any, natural predators and no commercial value aside from as fascinating aquarium animals so they aren't endangered or threatened in and of themselves. With loss of their preferred habitat--coral reefs--their numbers could possibly decline, but for now, we get to easily and readily enjoy these colorful organisms while snorkeling and diving in tropical and subtropical waters worldwide.

Enjoy, and Merry Christmas, Happy Hannukah, Happy Kwanzaa, Merry Solstice, and a happy 2013!

Happy Holidays everyone!

Thursday, September 11, 2014

TMI! TMI! Science in the Information Age

Douglas Hine wrote a great article on Aeon: What is Information? Where he talks about how we use the internet compared to the promise and potential of the internet. "The internet promised to feed our minds with knowledge. What have we learned? That our minds need more than that."

I found that clarifier misleading. Our minds may not need more than that, but for information to be valuable, our minds have to be able to do something with that information--put it into context, understand it, synthesize that into other knowledge we have and see how it relates. Hine does go on to discuss all that in the article, so read the whole thing--he makes a lot of great points that will get you thinking.

And that, my friends, is the big difference between having access to information and having knowledge.



At the CZ 99 Conference, the keynote speaker talked about how much better/easier things would be in the future for those of us working in natural resource management because of the Web, where everyone would have access to the same information. He spoke of our next big challenge being getting all the available information out to everyone by using this resource, so that better decision could be made! How exciting.

I turned to the person next to me and said something to the effect of, "That's ridiculous. Information isn't knowledge. The next big challenge is going to be differentiating valuable and correct information from garbage. Most people can't. The real challenge is going to be overcoming all the misinformation that will spread." She looked at me like I was nuts and I wondered if I was being too pessimistic.



I'm not making any claims to being prophetic here. Honestly, at the time, I hoped I was just being pessimistic. Yet, all we have to do is look to the discussion of climate science--and the fact we're having a discussion instead of doing something about it?!--to see I was on to something. Even more than I feared. Consider, more people understood and "believed" the science of climate change and global warming in the pre-internet 80s than in the 00s. It has been studied since the 1800s, with a lot of focus and progress through the 50s and 60, so scientists had a pretty good, but not great handle on it back then. They knew it would be big, if we didn't change our dependence on fossil fuels. They were confident we'd have better, cleaner technology before it became a problem. Little did they know the influence oil and gas lobbies would have on our ability to make any meaningful progress in that direction.

The information that was generated back in the 50s and 60s was analyzed and critiqued through the peer-review process, found to be robust and accurate, and then moved into the public realm through popular media--National Geographic, Scientific American, and then on into public policy discussions. By the end of the 1950s the consequences of CO2 release were clear enough for policy makers to take note. In 1965 President Johnson told the nation "[t]his generation has altered the composition of the atmosphere on a global scale through ... a steady increase in carbon dioxide from the burning of fossil fuels." In 1969 Senator Daniel Patrick Moynihan was warning of a dangerous sea-level rise of 10 feet or more. "Goodbye New York" he said. "Goodbye Washington." (NPR, 2014.)

"...climate science and climate change are older than the atom bomb, older than the discovery of penicillin and the older than recognition of DNA. It's older than trans-Atlantic jet flights, digital computers and moon rockets. Climate science and its conclusions are now venerable, established science. To claim anything else is to rewrite history" (NPR, 2014.)

The evidence is overwhelming, the course we have to take (should have taken) is clear, but instead of moving forward, making progress, and at the rapid pace technology would allow us to, we've instead taken a step backward as a society, thanks largely to the information age being the success that it is.

"We're a nation of information illiterates."


As I, and a whole lot of people smarter than I am, saw coming fifteen years ago, our biggest challenge in managing the Earth's valuable and limited natural resources, in managing human health and well-being by ensuring the health of those resources isn't a lack of information, but a lack of knowledge. Too many people confuse information with knowledge, are happy to accept anything they find on the internet as "fact," never using any critical thinking to evaluate the legitimacy of that information, and never using any brain power to take the next step of analyzing it in the context of all other knowledge to make valid assessments about how it applies. We're a society of information-rich illiterates. (For a more in-depth look at the extent of that illiteracy, here's a great article at Open Education.)

Bloom's Taxonomy is a tool that explains how we learn and how we move from information to understanding, to real knowledge--with the ability to apply information appropriately in the correct situations to make valid decisions, then moving to fully understand the implications to other areas, not just the specific situation in which we've learned that information, and finally, the highest level of learning--being able to make valid assessments and evaluate new information and situations with that.
Bloom's Taxonomy


Our overwhelming access to unlimited, unfiltered information, and our indiscriminate use of the internet to get at it and spew it without thinking has led to us lopping off the top 5 layers of Bloom's pyramid. We've become complacent about learning--a society that thrives on information, but cares nothing about comprehending what that information means. Without that level of the pyramid, all the other layers crumble. We can't effectively apply information if we don't understand how and where it's appropriate to do so. We can't analyze bigger related concepts and link together the component parts--synthesize information--if we don't get what those building blocks of knowledge mean and how they relate to each other; we can't expand our use of these concepts and this information to other areas if we don't even understand it at it's simplest level, and without any of that, how do we ever evaluate the real significance of a problem so that we can then solve it?

"Maybe in the next incarnation of technological advancement, instead of being excited about a plethora of information, we'll focus on a plethora of learning and understanding...The Knowledge Age."


As the Information Age has played out so far, the answer to all those questions is, we don't. Is it any wonder I'm a curmudgeon?

Maybe in the next incarnation of technological advancement, instead of being excited about a plethora of information, we'll focus on a plethora of learning and understanding...The Knowledge Age. We can only hope.



RESOURCES
Krumme Family, 2012. Major Categories in the Taxonomy of Educational Objectives (Bloom, 1956). Available at: http://www.krummefamily.org/guides/bloom.html

NPR, 2014. The Forgotten History of Climate Change. Available at: http://www.npr.org/blogs/13.7/2014/05/13/312128173/the-forgotten-history-of-climate-change-science

Open Education, 2009. In the Midst of the Information Age, Why Are We So Uninformed? Available at: http://www.openeducation.net/2009/03/15/in-the-midst-of-the-information-age-why-are-we-so-uninformed/