another graduate student graduating... cartoon

I have to admit I loved this recent PhD Comic:

bat sperm!

Post-field update: I've returned home, almost caught up on sleep and grocery shopping but most importantly I am happy to report that I've been able to find and photograph BAT SPERM!  While I have a lot of work to do with my samples this seemed like news worth sharing.

So here is is- my first successful bat sperm sample! Join with me to marvel at this tiny wonder (below).

This particular sample is from an Artibeus jamaicensis (the Jamaican fruit bat).  The sperm is as of yet unstained but at least here it is in all of it's glory for a quick glimpse!

A Eumops by any other anem- howlers and prehensile-tailed porcupines (oh my)!!

Busy busy busy! 

We've been busy processing lots of great bats here.  Last night was a bit of a mess with a massive storm that rained us all out and forced us to close nets down.  Winds were strong enough to rip down branches - some of which almost hit several people!   Despite this we did catch some bats (pre-rain).

Also- this morning a big surprise was that two big bats were knocked down from a nearby palm tree and found by workers here where we are staying.  We thought these guys were Mollosida rufus but it turns out they were Eumops sp.!  Pretty exciting!

In other news- howler monkeys have decided that they like being closer to our cabins! 

Tonight an exciting discovery came in the form of a NEOTROPICAL porqupine!

Sorry for the brief blog but I have to hit the hay to get up and check a harp trap in the am... photos to be uploaded soon/next!

Bats bats bats! Belize bats!

It has been extraordinary, wonderful, exciting, thrilling, lovely, great AND awesome to be here in Belize catching bats and working in the field with wonderful scientists such as Nancy Simmons, Sharon Swartz and the 'leader of the pack' Brock Fenton (that is a short list of those who are in attendance- let me say LOTS of other great people!)  Lots of nets, harp traps and echolocation recording as well as radio telemetry is happening all around as we speak!

As things are so busy I only have time to mention a few of the most exciting species we've caught so far!  Photos and information on each will follow soon.

Belize bats (May 2013):

>Carollia perspicillata- common name: Seba's short-tailed bat

(a male shown here eating a piece of papaya)

Artibeus lituratis
 *image/info coming soon

Eptesicus furnalis
 *image/info coming soon
 
Myotis keaysii
  *image/info coming soon

Desmodus rotundus
 *image/info coming soon

Rhynchonycteris naso
 *image/info coming soon
 
and MORE (I think we have ~19 species so far)!

Fractals inception-style and the father of fractals: Benoit Mandlebrot

I am currently reading Chaos Making A New Science by James Gleick and my mind seems to be lost in a perceptual run-through of the beauty of fractals.  The term fractal was coined by the amazing Benoit Mandelbrot.  Here I refer to his science but it is worth mentioning that he lived a very fascinating life including escaping Nazi persecution upon fleeing his native Poland to France and thus the science he was able to conduct in his life is all that much more precious.


His research and 'knack' for seeing fractals has resulted in him remaining one of the most inspirational scientists I can think of.  I am not alone in this thought; James Gleick in Chaos himself says:

"Benoit Mandelbrot was the one who let us appreciate chaos in all its glory—the noisy, the wayward, and the freakish, from the very small to the very large. He invented a new and slightly nebulous field of study—a kind of geometry, for want of a better description—and he invented that recondite name for it, fractal.^"

Certainly a 'character' I highly recommend his TED talk (below).

 

"The beauty of geometry is that it is a language of extraordinary subtlety 

that serves many purposes".   B. Mandelbrot

So what is a fractal? 

Fractal is a word introduced by Mandelbrot to describe a mathematical concept also witnessed in the natural world of self-similarity across scales.  (Inception style!)   

An example of this can be seen below in a loop continually zooming in on a a Mandelbrot Set image across scales.  You see the shape (large circle on right attached to a small circle on the left) but as you zoom in you see that this shape is made by many smaller versions of the same shape.  Zoom in on any one of those and you will see a smaller self-similar FRACTAL of the original shape and so on.  Repeat as long as your brain can tolerate the fractalness!  Me?  My mind is already blown by about 3 fractals!  ;)

Fractals are mathematically non-differentiable.  Needless to say mathematically-speaking fractals are quite complex and I am not a mathematician so I will instead focus on a few cool examples. 

Fractals in nature:

An example of fractals in nature- broccoli.

Mountains- fractal.

The airways of a mammalian (dog) lung.  From: Dr. Robert Henry DMV of the University of Tennessee College of Veterinary Medicine via:  http://classes.yale.edu/fractals/panorama/biology/physiology/animallungs/animallungs.html

Finally- to me feathers are also fractals- but I could be wrong (what do you think?)

Mandlebrot ran computer simulations of complex numbers in mathematical operations approaching infinity to reveal the patterns of fractals that result.  In addition to the resulting images that are the poster-children of Fractal research (examples above and below)- he published several books with lovely fractal images.

In his famous paper written and published in Science (1967) Mandlebrot clarifies the concept of the fractal further titled: "How Long Is the Coast of Britain? Statistical Self-Similarity and Fractional Dimension"

Here he presents a case where ... 

...say you were to measure the coast of Britain using a measuring instrument of the size indicated below you can imagine your work process and end result would look something like this:

 Now lets say you realize you've missed some little pieces of the coast (see there on the left-side?) so you decide to do this again but now with a smaller measuring implement.  Britain suddenly gets much larger (more coastline) (see below)!

 This process could be repeated again and again with a smaller measuring implement (see you still missed some bits of the coast) and you would find that the coast is still larger...still missed some?  Repeat- and boom!  The coastline is longer (and so on till you find yourself crawling along the coast measuring around pebbles and sand to get each contour of the coast!).

Why is the coast longer and longer - the finer scale you use to measure it?  Well the coastline is fractal and the closer you look the more curves/lines indents and whatnot it has. As you add these imperfections to your measurements your 'estimate' of the coastline with be longer, longer and LONGER!  Inception-style!

Ok- as this post is not really about bats I should stop digressing and get back to the bats!  

This has just been brief introduction to the lovely world of fractals and I hope you are now equally excited as I am about  fractals and the legacy of Mandlebrot.  Fractals seem to be a place where mathematicians, biologists, and artists can have many an inspiring exchange!

 

Note: What is 'inception style'?  

'Inception style' refers to a concept from the movie Inception (term coined by graduate students in the OEB program at UMass Amherst in conversational settings).  Inception was released in 2010, directed by Christopher Nolan and stars Leonardo DiCaprio.  I don't want to ruin it for you so I'll suggest you Netflix it or at least watch this trailer to see how Inception Style is another example of fractals!   

Ie. Fractals in Hollywood?  

 (Perhaps it only works if things get 'smaller' as you repeat (I'm being careful to not say too much and ruin it for you- but think on it if you have seen it))!

The Count Loves Bat: learning to count using bats!

Bats and Sesame Street!  Just another case of bats being depicted in a fun way - although perhaps still rather cliche/mythical manner considering they are chilling with Count Dracula!  At least here they are quite cute so maybe kids who saw this would LIKE the bats in the clip.

Romanian flag

Interestingly enough Count Dracula makes me think of Romania (Transylvania is where the original 'Count' was supposed to be from) and a quick search revealed that indeed Romania has its own Romanian Bat Protection Association (here)!

Furthermore, they COUNT bats!  (Sorry I couldn't resist- but really... look there they are counting bats!)


Oddly there are no vampire bats in Europe so where the mythical connection between bats and vampires came from in this region remains something of a mystery to me but I am sure someone somewhere has a hypothesis regarding where this mythical relationship originated.  Of further interest is what made Sesame Street producers decide that they needed a 'count to count' is interesting and clever.  I am not sure how many kids loved him growing up but I would like to be counted in that number!

Transylvanian coat of arms (Transylvania is a historical region of Romania).

True Facts About Bats

This video is too amazing (i.e. hilarious) to not share.  The video was made by this guy.  It is fairly accurate and includes top-notch humor.  Enjoy!  (P.s.  I think 'Eric' is an Artibeus jamaicensis... meaning he is even more awesome than depicted just here!)