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Below The Surface

Sunday, April 29, 2012

An Idea Blooms into a New Demo

One of the many perks of my job is getting to be an expert. Whether its training a new team of Animal Care volunteers or speaking to a crowd gathered for one of our Demos each day, I get to share what I know to people who are generally very interested in the natural world. More often than not, these experiences
Claire Trotter presenting
lead to many ideas, including prospects for bringing new information to our guests.  An exchange of ideas between myself and Claire Trotter, a seasoned Animal Care volunteer, culminated into an exciting new demo which she brought to ECHO for the first time this afternoon.

What looks like Claire sharing some recent mug shots is actually part of a new demo we call "Our Animals' Bodies: Male or Female?"  In it we talk about some of physical characteristics of some of ECHO's animal ambassadors that can be used to tell the sex of an animal.   Although the question of whether a particular animal is a boy or girl comes up all the time, its not always an easy one to answer.  Claire did research to find some of the most consistent and striking examples of sexual dimorphism (difference in appearance between guys and gals) that can be used any time of year, not just during breeding season.  The results are interesting and easy to practice while looking at our animals, but can be a bit of a dry topic.  So why not consider what it might look like if these same characteristics showed up on us?

You may just be surprised at the results! 

Brian and his "keel"
The carapace of a male map turtle has a ridged called a keel



















Its no surprise that Claire did an awesome job developing and presenting this new demo.  What continues to strike me is how fun it can be help others create demos and watch them be the expert.

Thursday, April 26, 2012

ECHO E-Team at the Intervale

What's a great way to spend an E-Team (Environmental Team) meeting on a perfect spring day? Go on a field trip to the Intervale Conservation Nursery! Julia VanderWoude (ECHO's Education Intern from UVM), reflects on her time leading  members of ECHO’s teen leadership and environmental science program at the  Intervale where they got a taste of a different aspect of environmental stewardship in Burlington.
By Julia VanderWoude

Even though all of our E-Teamers are from the Burlington area, only about half the group had been to the Intervale before last week to volunteer or explore. We received a quick tour of the property from Seth Gillim, the Intervale’s Assistant Manager, and got a chance to talk to him about the impacts of last spring’s flooding on the Winooski River and the Intervale’s farms, as well as the history of the area and some of the riparian species we were seeing. The E-Teamers had some great questions for him and were especially interested in the fact that the Intervale did much of their harvesting via canoe last year.

After the tour, the E-Teamers jumped right into the service task that had been given to them. They spent some time picking up branches in the recently tilled rows being prepped for tree seedling planting. A few E-Teamers also helped lay drip lines down the rows of new seedlings. Some of the E-Teamers commented that it was a chance to see the “manual labor” side of environmental stewardship, something that they don’t get a lot of while interacting with visitors inside ECHO. I enjoyed getting to have fun conversations with E-Teamers while we worked and enjoyed the spectacular blue skies.

To round out the field trip, we took a walk through the Intervale’s greenhouse, which gave the E-Team a chance to see the seedlings that would eventually be going into the ground in the field on which they had just worked. E-Teamers thoroughly enjoyed making that connection, and now they are looking forward to our upcoming field trips, including canoeing and sailing on Lake Champlain!
I can't wait either!

Wednesday, April 4, 2012

Giving Blood for Stewardship

Did you know the the "O" in ECHO stands for opportunity for stewardship? That is, looking for ways to act to help sustain our natural ecosystems? Whenever possible, I communicate to our guests what effects we humans have on the natural world around us, and suggest ways to look for opportunities to change our behavior. Sometimes opportunities to help a rare species may come from unexpected places and might require navigating uncomfortable challenges. Our Animal Care Department recent tackled a new challenge that just might help an endangered species that are a cornerstone of our popular Lake Tank exhibit.

Lake sturgeon are listed as
as either threatened or endangered by 19 of the 20 states within its original range in the United States. This means that all of the populations of this large bottom-feeding fish are at risk of disappearing from the waters which they inhabit, including Lake Champlain. To be a threatened or endangered species means that the numbers of reproductively mature individuals in a population are low enough that stresses like habitat changes, a disease outbreak, the arrival of an invasive species, bouts of unfavorable weather, or increased levels of pollution can eliminate a population from an area over time. Often, more than one of these stresses act on a population at the same time. For the lake sturgeon, the use of our Basin's rivers to generate power- saw and grist mills in the past, hydroelectric nowadays- have disconnected these large fish from their riverine breeding habitat. The few fish that can still find silt-free gravel beds in which to spawn may produce fewer offspring due to the stresses like elevated pollutants have on their reproductive system.

We were recently contacted by Dr. Louis DiVincenti, a veterinarian for the Seneca Park Zoo in Rochester, New York to see if we might help with a study of lake sturgeon restoration in that he has been involved in for a number of years. Dr. DiVincenti's part of the study is to measure the levels of contaminants present in sturgeon that have been re-introduced to the Genesee River. To put the data from these wild fish into perspective, he asked if we (along with other aquariums) could provide blood samples from the captive lake sturgeon. Because our participation would mean performing some invasive procedures on our most charismatic animals, we decided with caution whether we would participate in the study. Is it worth taking blood from our healthy animals to help their wild cousins?

We decided that yes, we would participate with an appropriate level of caution. We'd carefully capture one sturgeon, coax it into a floating tub, put it under anesthesia, draw the necessary blood for the study, and recover the fish before quietly releasing back to the tank. If things didn't go smoothly, we'd reconsider putting our animal ambassadors at risk for the greater good.

After receiving our supplies and reviewing the protocols for taking the blood samples, we began our work:

A team of three people would work to capture the fish- two using nets to guide the fish into a plastic cattle trough held vertically by the third.

Once the fish was captured and contained inside the now floating cattle trough, we allowed it to acclimate to its short-term housing, then dissolved a carefully measured amount of fish anesthetic into the water. At this point, we must track time to prevent an overdose. The longer a fish is in the anesthetic bath, the larger dose it receives. The art and science to this is choosing a dosage that allow us adequate time to perform our procedure without the chance of accidental overdose. Lower amounts of anesthetic allow more time, but take more time to take effect. Since each fish responds differently to this, a lot of careful guesswork, observation, and patience pays off.

Then we wait until the fish become unresponsive to being manipulated, a sign that the anesthesia is working and we can perform the blood draw without injuring our friend. If we act too early, the fish could move and cause the needle to go into unwanted tissues (or us!). We measured the fish's length and girth during this time.

Once the fish is fully "under," we prepared to insert a needle through the muscles between anal pore and anal fin by locating an area of soft tissue between two of the bony scutes on the underside of the fish. As the needle passes into the muscle tissue, a vacuum tube is engaged to draw blood into it when the needle finds the vein. In this case we are seeking a vein that runs along the bottom of the fish's spine. The needle is pressed downward until it meets the spine, and then very slowly reversed until a "flash" of blood enters the vacuum tube from the vein. The trick is to move slowly enough to find the vein, see the flash, and then hold the needle in place to collect the samples needed for the project.

Once the samples were collected, they were processed and shipped overnight to the lab for analysis. The needle was removed from the fish and the process to recover the fish from anesthesia begins.

By carefully using these methods, we successfully collected samples from all three lake sturgeon that the study required.

Capitalizing on this particular stewardship opportunity was a collaborative effort. In addition to our dedicated animal care staff and volunteers, our friends Dr. J. Ellen Marsden and Susan Fuller at the the Rubenstein Ecosystem Science Laboratory provided equipment without which we could have completed this project. Thank you to everyone involved!