Category — plant research
Welcoming Two New Post-Doctoral Fellows
Two new post-doctoral fellows, Dr. Lindsey Vansandt and Dr. Anne-Catherine Vanhove, were welcomed to CREW in the fall of 2014.
With funding support from the Joanie Bernard Foundation, Dr. Vansandt will be working with Dr. Bill Swanson, CREW’s Director of Animal Research. Dr. Vansandt obtained her Doctor of Veterinary Medicine degree from the University of Missouri and her Doctor of Philosophy degree from the University of Maryland (in collaboration with the Smithsonian Conservation Biology Institute). Her Ph.D. studies focused on characterization and propagation of spermatogonial stem cells in domestic cats as a model for conserving endangered cat species. Dr. Vansandt also has experience working in veterinary emergency services. At CREW, she will be conducting studies to improve the health and welfare of feral and shelter cats as well as helping to apply oviductal AI for propagation of endangered felids.
With funding from the Institute of Museum and Library Services (IMLS), Dr. Vanhove will be evaluating survival of plant samples in CREW’s Frozen Garden under the supervision of Dr. Valerie Pence, Director of Plant Research. Dr. Vanhove will complete the second phase of the IMLS project, focusing primarily on the survival of shoot tips and gametophytes after long-term storage in liquid nitrogen. She recently received her Ph.D. from the Division of Crop Biotechnics, Katholieke Universiteit Leuven, in Leuven, Belgium. Her thesis work with meristem culture, stress physiology, and cryopreservation makes her well suited for the IMLS project.
The University of Cincinnati/Cincinnati Zoo Connection
CREW has had a long-standing collaborative relationship with the University of Cincinnati’s (UC) Department of Biological Sciences, but today it is strengthened by two promising young scientists who split their time between CREW and UC. Corrina DeLorenzo and Megan Philpott are both enrolled in UC’s Ph.D. program under Drs. Ken Petren and Theresa Culley, respectively, but they are conducting much of their dissertation research at CREW.
Corrina earned her bachelor’s degree at Miami University, with a double major in Zoology and Environmental Science. As an undergraduate, she became involved in research evaluating the population genetics of the Italian wall lizard or “Lazarus lizard” in the Cincinnati area. After graduating, Corrina was accepted to CREW’s summer internship program, working with Dr. Erin Curry on the Polar Bear Signature Project. She was recruited into UC’s graduate program in January 2014. Since starting her Ph.D. research, Corrina has identified multiple antibodies that detect specific proteins in polar bear feces in an effort to develop a polar bear pregnancy test.
Megan received her bachelor’s degree from UC in Biology and was also an intern at the Cincinnati Museum Center, managing the Museum’s Philippine Bird Genetics project. Her Ph.D. research is part of the Plant Lab’s IMLS funded project to evaluate samples that have been stored for years in CREW’s CryoBioBank for genetic changes that might have occurred over time. In April, Megan was awarded the Botanical Society of America’s Public Policy award to attend Congressional Visits Day on Capitol Hill. There, she learned about communicating science to policy makers and met with the offices of Ohio Senators and Representatives to request their support for increased federal funding of scientific research, using CREW’s research as an example of the importance of federal funding and support. (Students supported by the UC Department of Biological Sciences, Institute of Museum and Library Services and CREW Eisenberg Fellowship.)
P&G Wildlife Conservation Scholars
In 2011, CREW established a partnership with the Ohio State University’s College of Veterinary Medicine to train veterinary students in conservation sciences with funding support from Procter & Gamble Pet Care. This past summer, two OSU veterinary students, Kelly Vollman and JaCi Johnson, were selected as P&G Wildlife Conservation Scholars.
Kelly worked with Dr. Monica Stoops analyzing urinary testosterone and glucocorticoid concentrations to determine if the pattern of excretion could be used to predict gender, parturition date and assess fetal viability during Indian rhino gestation. Kelly analyzed urine samples collected throughout seven Indian rhino pregnancies that resulted in three male and four female calves. Six of the pregnancies ended with the birth of live calves, whereas one pregnancy ended in a stillbirth, a relatively common occurrence in this rhino species. By learning more about the endocrinology of pregnancy, results from Kelly’s study will help establish physiological markers to improve pregnancy outcome in this species.
JaCi worked with Dr. Bill Swanson to investigate cat sperm vitrification as an alternative to standard slow freezing methods. Vitrification involves ultra-rapid cooling to avoid ice crystal formation and form a “glass” instead. For this study, JaCi collected semen from domestic cats (and one ocelot) and compared vitrification in a sucrose solution, with direct pelleting in liquid nitrogen, to slow freezing with glycerol in straws over liquid nitrogen vapor. Post-thaw sperm motility and acrosome status were similar between methods and 25% of domestic cat oocytes were fertilized following insemination with vitrified
sperm. This simplified approach to cat semen preservation may be particularly useful for field biologists working with felids in the wild.
November 21, 2014 No Comments
Numbering in the billions in 1800, the passenger pigeon was formerly one of the most abundant bird species on Earth. On September 1, 1914, Martha, the last known passenger pigeon, passed away at the Cincinnati Zoo after tireless efforts over several years to find her a mate.
To commemorate the 100th anniversary of Martha’s passing in 2014, the Zoo renovated its Passenger Pigeon Memorial, transforming it from a single-species memorial to an educational exhibit with a positive and hopeful conservation message that segues from the story of the passenger pigeon to modern wildlife conservation efforts.
A small crowd of Zoo visitors and staff along with media representatives gathered at 11:00 AM on September 1, 2014, as Zoo Director Thane Maynard dedicated the Memorial and officially reopened its newly restored doors. Watch the dedication video here.
Visitors to the Memorial are greeted by a large reproduction of John Ruthven’s 2013 painting of Martha, the Last Passenger Pigeon on the entry wall.
A display case on the back side of the entry wall contains a reprint of John J. Audubon’s Passenger Pigeon hand-colored engraving from The Birds of America, along with an actual net used to catch passenger pigeons, a platform stool to which blinded pigeons were tied as decoys, a cast model of a passenger pigeon and an Aldo Leopold quote.
Interpretively, the exhibition flows from left to right along the interior walls, circulating around an octagonal case in the center of the building containing passenger pigeon sculptures carved by Gary Denzler.
Signage was designed based on elements from Ruthven’s painting with pop-up panels featuring colorful images and text. The first wall tells the story of the passenger pigeon and its extinction, why it happened, and the scope of this loss.
Next, it describes how the passenger pigeon’s extinction was a wake-up call that spurred the conservation movement in America, highlighting the stories of native species that were nearly lost, such as white-tailed deer.
The last wall introduces conservation champions of the Zoo and presents examples of how we are working to save species today, including the Sumatran rhino and the American burying beetle, from going the way of the passenger pigeon.
The rehabilitation of this historic building and exhibit was made possible through the generosity of the H.B., E.W. and F.R. Luther Charitable Trust Foundation, Fifth Third Bank, and Narley L. Haley, Co-Trustees.
September 10, 2014 2 Comments
As we described in a previous post, several samples stored in the Frozen Garden of CREW’s CryoBioBank are going to be removed during the next months in order to examine their viability. And, here are results from the first ones: Coming to life after being stored for 15 and 20 years in the ultra-low temperatures of liquid nitrogen (-321 F!!)! And the most interesting result…they germinated as fast and as well as they did the day they were frozen!
These are seeds from poplar trees. Seeds from poplars, and also from most willows, germinate very fast because in their natural habitats they have enough water available when they are shed, but also because they must germinate in a short window of time. These trees grow very close to water courses and floodplains where there are frequent disturbances of the substrate in which they grow. The most common disturbance is flooding, which in most cases removes the soil and washes away the seeds and seedlings that are not established. Moreover, during winter, water in the soil can freeze, damaging any ungerminated seeds that remain completely wet along the river banks. For these reasons seeds are shed at the end of the spring and beginning of the summer, when temperatures are warm enough and water availability optimal. Thanks to their fast germination (within 24 hours!) poplars and willows can grow quickly in the summer days, establishing small trees that will be big and strong enough to survive flash flooding and the cold and dry winter. However these seeds are very short lived, and die at ambient conditions in just 2 or 3 weeks if they do not germinate. In the Frozen Garden of CREW at the Cincinnati Zoo and Botanical Garden we have preserved their initial viability and rate of germination for several years; including some samples stored up to 2 decades!! Thanks to these experiments we have demonstrated that seeds from endangered poplars and willows can be preserved for long periods of time, in order to keep them alive for our future generations!
Along with poplars and willows, orthodox seeds of several species were removed from liquid nitrogen in June. Orthodox seeds are those seeds that naturally dry during their maturation in the fruit, and thus they can be frozen in seed banks, keeping their initial viability and vigor. So, we could say that they have a “natural” predisposition to be stored at the low temperatures of liquid nitrogen. We have chosen these samples since they do not have special requirements for their recovery and germination, as other samples stored in the frozen garden have (as shoot tips, etc). Germination is the easiest way to analyze seed viability, and, at the same time, it produces seedlings that can be grown to produce plants for future use.
In order to recover seeds from the Frozen Garden, the cryovials with seeds were carefully removed, since dry seeds at very low temperatures are very brittle and we didn’t want to damage them. Then the cryovials were thawed at room temperature for 1 hour. Seeds were re-hydrated in a moist, saturated environment over night to avoid any imbibitional damage, which is damage that can be produced by rapid water uptake when seeds are very dry.
Some of the seeds have special requirements for germination because they are dormant. One of these special requirements is a “moist/cold stratification” for several weeks in order to break the dormancy and stimulate germination. It is as if the seeds were resting in the soil of winter! Seeds that did not require stratification were sown in petri dishes on blue filter paper particularly designed for seed germination. Then they were put in a controlled temperature and light growth chamber, and germination was monitored daily.
Seeds from several species have germinated very well after storage in ultra-low temperatures for several years, including the short lived seeds of the endangered plant, native to eastern North America, Plantago cordata (heartleaf plantain). The heartleaf plantain is threatened or endangered in 11 states including Ohio, Illinois and Kentucky because populations have declined or disappeared almost everywhere. The heartleaf plantain is a wetland plant with highly localized distribution which makes it very sensitive to habitat destruction, particularly that occurring for urbanization. We have stored their seeds for 14 years without any decline in their initial germination.
More samples will be removed soon! We will keep you updated with the most interesting findings!
September 9, 2013 2 Comments