As I was getting ready to defend my PhD this past July, my
advisor got a call from an editor at Smithsonian Magazine with a somewhat
strange question. He wanted to know if he could find them some prairie voles to
photograph for an upcoming story. He said yes, we have a field site teeming
with voles, and since I was the resident wild rodent expert in Bloomington,
Keith asked if I might help them. I said as long as they waiting until after
the 11th I would be happy to catch some voles in the prospect of
working with a real wildlife photographer and to get some publicity for the Indiana University Research and Teaching Preserve.
After a couple phone conversations with John Eastcott, it
was planned for him to make the trip from New York state to Bloomington the
week after my defence. After months of sitting in front of my computer I was
excited to do some field work for fun. I got my field gear all set up and with
the help of one of the trusty undergrads in our lab, Tomas, we set up a
trapping grid out at Bayles Road, where I did my very first rodent trapping the
summer of 2007, just after getting married and before starting my grad studies
at IU.
John arrived on the scene in the afternoon while we were
setting up the trapping grid. Unfortunately, this week was maybe the hottest
and most humid week of the year, and for someone not used to field work during
Indiana summer things were more uncomfortable than expected. But John was
great, totally professional, and was ready to work. Most of his experience as a
wildlife photographer was going to exotic places with his wife, also a
journalist, to photograph penguins, elephants, and other charismatic megafauna.
In order to get the best shot of these little rodents (prairie voles are about
40 grams, or about 1.5 oz) John constructed a rectangular plexiglass box that
could be placed on the ground and could keep the voles in a small space. We
scouted some possible locations that would have some good background scenery,
give a good sense of the voles habitat. The box would be set up the following
morning after the traps were open all night.
The next day, the first day with the animals, was mainly a
trouble-shooting day. We had to figure out when the light was just right, and
how early we needed to be there to get things ready by this point. Our first
try of digging a little trench in the ground for the box to fit into didn’t
quite work, we had a couple escapees, and made it so we couldn’t move to follow
the light. The box also kept fogging up because it was so humid. We also didn’t
get very many animals, which is common when trapping voles; they are usually a
little neophobic of the traps the first night and then are more likely to go in
the following days. John’s solution was to make a base for the box and then
build a little diorama-type scene in it with vegetation dug up from the field
site. This ended up looking great, and would allow us to move around the site
to find the best places. We set the traps again that night and were ready to go
back the following morning.
The next morning we caught a few more voles than the first
day. Three of these, a male, female, and juvenile, were all caught in about the
same part of the grid which suggests they are part of the same family group. We
set up the box, lifted up on some buckets to get a better view of the site and
to try and avoid the higher humidity closer to the ground. These guys were the
money voles. We started with one of the adults, and John got some great shots
of it with the morning sun gleaming over the trees. We then tried putting the
other adult in, and they interacted really well together. I then put the juvenile
in, and everything was still fine. This suggests to me that either we got a
mating pair and one of their offspring, or they were all familiar to each other
and maybe used the same nests.
It was really cool to see them behaving in this context
because I usually just get them out of a trap and then as soon as I put them
back they squiggle through the grass and are gone. They moved through the grass
in a way that looks more like swimming than running. Their bodies are long and
narrow, kind of like a sausage with short legs. These voles were also very affiliative
with each other, cuddling and sniffing. This is where John got the shots used
in the magazine.
So after many hours in the hot and humid Indiana weather,
crouched behind a blind lying on his stomach, John got the shots he came for. He
and the editor described this as a near-impossible task, with how small and
elusive these guys can be, but the week was a success!
You can read the related article in the February 2014 issue of Smithsonian Magazine. They have graciously allowed me to link to the story
here. The story is mainly about the studies done on why prairie voles are socially
monogamous while other vole species are promiscuous or polygynous. There is a
lot of interesting work on this, both in the field and in the lab, at many
universities. When I worked as a field assistant at Bayles Road it was for a
post-doc, Craig Streafeild, in Nancy Solomon’s lab at Miami University-Ohio
studying multiple paternity and population genetics of prairie voles in
different habitats.
It was a great experience and a neat way to be greeted into
the world of experts helping out popular science journalists. Plus, cute vole
pictures!
P.S. All the photos I posted here were taken by me, as to not infringe on anyone's copyright. Check out John and Yva's website for more of their awesome photography!
