Genetic Diversity of the species significantly increased providing fresh hope for the future survival of this near-extinct species
Black-footed ferrets, a critically endangered species native to North America, have renewed hope for future survival thanks to successful efforts by a coalition of conservationists, including scientists at Lincoln Park Zoo, to reproduce genetically important offspring using frozen semen from a ferret who has been dead for approximately 20 years. The sire, “Scarface,” as he is affectionately called by the team, was one of the last 18 black-footed ferrets to exist in the world in the 1980s. Eight kits, including offspring of Scarface, were born recently, significantly increasing the gene diversity of this endangered population that a dedicated team is working to recover in the wild.
Their work published Aug. 13 in the journal Animal Conservation “Recovery of Gene Diversity Using Long-Term Cryopreserved Spermatozoa and Artificial Insemination in the Endangered Black-Footed Ferret.”
Partners working to save black-footed ferrets from extinction, and recover a healthy population back to the wild include Lincoln Park Zoo, The Smithsonian Conservation Biology Institute (SCBI), U.S. Fish and Wildlife Service, Louisville Zoological Garden, Cheyenne Mountain Zoo, Phoenix Zoo and Toronto Zoo.
“Our study is the first to provide empirical evidence that artificial insemination with long-stored spermatozoa is not only possible but also beneficial to the genetic diversity of an endangered species,” said David Wildt, lead author, senior scientist and head of the Center for Species Survival at SCBI. “What we’ve done here with the black-footed ferret is an excellent example of how sperm preservation can benefit species recovery programs.”
The U.S. Fish and Wildlife Service developed and oversee the Black-Footed Ferret Recovery Program. The Association of Zoos and Aquariums’ Species Survival Plan manages the black-footed ferret breeding program at ex situ facilities, the breeding population in which is comprised of approximately 300 animals.
“The entire species survival depends on successful captive management to ensure healthy genetics over the next 100 years and to produce individuals for the reintroduction program,” explained Black-Footed Ferret Reproduction Advisor Rachel Santymire, PhD, director of the Davee Center for Endocrinology and Epidemiology at Lincoln Park Zoo. “To balance out these demands on the breeding program, we have to ensure that each individual ferret passes its genes on to the next generation.”
Over the past several years, the team has been developing assisted reproductive technology like artificial insemination and semen cryopreservation. For this study, all of the males were managed either at SCBI or at the USFWS National Black-Footed Ferret Conservation Center. Scientists collected semen samples from adult black-footed ferrets that ranged in age from one to six years old. All females were managed at SCBI.
Initially, scientists used fresh semen to artificially inseminate females who failed to naturally mate with males, resulting in 135 kits. With just a few founders to rebuild an entire species, early managers of the black-footed ferret recovery program knew that genetic diversity would be lost. Loss of genetic variation can lead to increased sperm malformation and lower success of pregnancy over time. Researchers, led by Santymire, routinely collected and preserved black-footed ferret semen for later use as part of standard operating procedures.
SCBI developed a successful laparoscopic artificial insemination technique for black-footed ferrets. Females are induced ovulators, which mean that mating itself causes the ovary to release its eggs. SCBI researchers developed a hormone treatment that artificially causes ovulation to occur. Scientists then deposited the male’s fresh or frozen-thawed sperm directly into the female’s uterus. Animal care staff closely monitored potentially pregnant females by taking weight measurements and remote monitoring of the nest boxes via closed-circuit cameras.
During the 2008 breeding season, SCBI scientists used semen samples from four male black-footed ferrets donors that had been frozen for 10 years. Black-footed ferret Population Advisor Colleen Lynch of Riverbanks Zoo and Garden conducted population genetic analysis to select pairings of deceased sperm donors with living females based on several genetic metrics including mean kinship of the parents and inbreeding coefficients of potential offspring to maximize the genetic benefit of successful pairings. In the years that followed, subsequent AIs incorporated semen that had been cryopreserved up to 20 years, also resulting in successful pregnancies.
Read more:Â Critically endangered species successfully reproduced using frozen sperm
The Latest on: Conservation Biology
via Google News
The Latest on: Conservation Biology
- Rare Endangered Whooping Crane Hatches at Virginia Conservation Instituteon June 22, 2022 at 12:24 pm
The Smithsonian Conservation Biology Institute announced that the egg was abandoned in Wisconsin and then given to surrogate parents at the Virginia facility ...
- First Whooping Crane Hatches at Smithsonian Conservation Biology Instituteon June 20, 2022 at 6:00 am
For the first time, a whooping crane—one of the most endangered species of crane in the world —hatched on May 26 at the Smithsonian Conservation Biology Institute (SCBI) in Front Royal, Virginia, and ...
- News tagged with conservation biologyon June 10, 2022 at 4:59 pm
New research published in the June 3, 2022 journal Science reveals that 44% of Earth's land area—some 64 million square kilometers (24.7 million square miles) requires conservation to safeguard ...
- UAEU- College of Science Biology Department research team presents a new conservation tool to limit wildlife mortalityon June 6, 2022 at 2:18 am
Al Ain: The UAEU- College of Science Biology Department international research team has devised a new conservation tool presentation in an article published in the international journal ‘Conservation ...
- Wildlife Ecology and Conservation Majoron June 4, 2022 at 5:34 am
ecology or conservation biology. We are the only undergraduate program in our area where students meet the educational requirements to be certified as a wildlife biologist by the Wildlife Society at ...
- Should We Protect Nature for Its Own Sake? For Its Economic Value? Because It Makes Us Happy? Yeson June 3, 2022 at 1:43 am
Defending every species Conservation biology is a scientific field with a mission: protecting and restoring biodiversity around the world. It came of age in the 1980s, as humans’ impact on the ...
- Should we protect nature for its own sake? For its economic value? Because it makes us happy? Yeson June 2, 2022 at 11:33 pm
Conservation biology is a scientific field with a mission: protecting and restoring biodiversity around the world. It came of age in the 1980s, as humans’ impact on the Earth was becoming ...
- Should we protect nature for its own sake? For its economic value? Because it makes us happy? Yeson June 2, 2022 at 6:09 am
(THE CONVERSATION) As spring phases into summer in North America, with trees flowering and birds migrating, nature seems abundant. In fact, however, the Earth is losing animals, birds, reptiles ...
- Should we protect nature for its own sake? For its economic value? Because it makes us happy? Yeson June 2, 2022 at 5:40 am
Conservation biology is a scientific field with a mission: protecting and restoring biodiversity around the world. It came of age in the 1980s, as humans’ impact on the Earth was becoming alarmingly ...
- News tagged with conservation biologyon June 1, 2022 at 5:00 pm
In a study published in PNAS, researchers used conservation biology and genomics to discover that the New Guinea singing dog, thought to be extinct for 50 years, still thrives. Scientists found ...
via Bing News