Our most recent program was on the Sunday after Spring Break. In hindsight, not the best date for a program! We had two kids show up, and their parents. So, a small group, but we had a great time anyway, and asked lots of good questions.
In preparation for this program I visited my guest, Jess Magaña, at the OSU Zoology Department where she does her research. I took some pretty good photos of lizards in their cages...
|Brown anole lizards in their cages at the OSU Zoology Department|
|Jess holding one of her subjects.|
|This is just one section of one wall of the lizard room!|
I kicked the program off with a new song, "My Lizard Brain," which is basically about how mysterious it is the way we humans make decisions, and maybe that it has a lot to do with the way other animals make decisions, since we've retained a lot of ancient circuitry in our brains through the process of evolution. I expressed all that in the form of a love song, which my wife, Lisa, finds intriguing - it's the second lizard love song I've written. I don't know if that's a coincidence or a "thing." Maybe a lizard love CD is in the works.
|I kicked us off with a brand new song.|
|Giving some thought to how much energy a lizard should allocate to various lizard activities such as finding food, defending territory, and reproduction.|
|Collecting data from our imaginary lizards.|
During our program tried putting two males together in a cage, so we could observe some of the aggressive behaviors. We saw the lizards move toward one another and bob their heads. We didn't see them display their dewlaps, though, as they often will.
|Lizard fight! We introduced the light brown lizard on the right into the cage to see if the darker lizard on the left would defend his territory.|
|The lighter lizard made aggressive moves up the stick.|
|The darker lizard finally turned to face the interloper. They never got too energetic about the confrontation, though. Maybe they felt too cold or too "on display" for an energetic fight.|
Jess found in her study that the lizards who lost territorial fights put less energy into their offspring and more energy into their own upkeep. Those who had won the fights gained less weight and hatched heavier babies. Moreover, the effect was increased with the number of fights. The heaviest babies came from the lizards who had won two or three fights instead of just one.
One of our attendees suggested that the lizards who win fights can get the best territory with the most food, and therefore it makes sense that they would spawn larger offspring. That's probably true of lizards in the wild.
However, Jess went to a lot of trouble to make sure the lizards in her study got the same amount of food, and lived in very similar "territories." The only difference between the winning group and the losing group was that the winning group won their fight and the losing group lost theirs. I think it's really interesting that just losing a fight or two triggers the lizard to put less energy into her eggs.
Next time we'll be delving into the teeny tiny world of proteins and trying to figure out how those micro-machines that run our bodies do what they do!
April 13, 2:00 at the library. I hope to see you then!!