Showing posts with label captive breeding. Show all posts
Showing posts with label captive breeding. Show all posts

Thursday, December 22, 2011

Captive Breeding, Biodiversity, and Sustainabiliy

Deep Sea World in North Queensferry, Scotland has annouced they have bred the Golden Mantella, an endemic forest frog from eastern Madagascar, for the firts time. They have about 50 tadpoles that will metamorphose into froglets after about 60 days of development. Mantella aurantiaca is a group of species threatened by habitat fragmentation, it is also an attractive frog, and a prime candidate for zoos, aquariums, and private collectors to use for display. But, the Golden Mantella can also be used to get people's attention about the environment.

Madagascar's herpetofauna is disappearing due to human activity but documenting those extinctions is difficult at best.Species most at risk are those that remain in small populations in fragmented habiat, like small patches of forest that still support frogs, but once those framents of forest are logged, the species are gone, and it is unlikely anyone is going to be their to document it. Surveying habitats for species often miss small, cryptic species - we really have no idea how many species exsist - and we are pushing them into extinction before we even know they exist. The World Conservation Union (IUCN) Red Lists include
a few dozens of species from Madagascar, but the very rich and unique fauna is poorly known and disappearing before our eyes - but is out of site.

Captive breeding projects, like the one at Deep Sea World, are useful. They provide knowledge that can be used to held species from becoming extinct. However, once the habitat is gone, captive breeding projects can re-establish new populations - or at least that is the thought. But really, long term projects like these are as unstainable as Noah's Ark. Temporarly they can be quite usefull, but it is impossible to save all of the species that humans are pushing into extinction through captive breeding projects. The only real sustainable approach to stop the declines in biodiversity is for humans to slow their reproduction, live sustainably, and stop habitat fragmentation and start habitat restoration - this does not seem likely. Recently the human population is thought to have exceeded 7 billion.

Thursday, December 1, 2011

World's first captive breeding of Ozark hellbenders at Saint Louis Zoo

Ozark hellbenders after hatching. Photo credit
Mark Wanner/Saint Louis Zoo
Decade-long collaboration of zoo and federal, state scientists yields 63 baby hellbenders

The Saint Louis Zoo's Ron Goellner Center for Hellbender Conservation and the Missouri Department of Conservation announced on Nov. 30, 2011, that Ozark hellbenders have been bred in captivity—a first for either of the two subspecies of hellbender. This decade-long collaboration has yielded 63 baby hellbenders.

The first hellbender hatched on Nov. 15, and currently there are approximately 120 additional eggs that should hatch within the next week. The eggs are maintained in climate- and water quality-controlled trays behind the scenes in the Zoo's Herpetarium. For 45 to 60 days after emerging, the tiny larvae will retain their yolk sack for nutrients and move very little as they continue their development. As the larvae continue to grow, they will develop legs and eventually lose their external gills by the time they reach 1.5 to 2 years of age. At sexual maturity, at 5 to 8 years of age, adult lengths can approach two feet. Both parents are wild bred: the male has been at the Zoo for the past two years and the female arrived this past September.

Rivers in south-central Missouri and adjacent Arkansas once supported up to 8,000 Ozark hellbenders. Today, fewer than 600 exist in the world—so few that the amphibian was added in October 2011 to the federal endangered species list.

Due to these drastic declines, captive propagation became a priority in the long-term recovery of the species. Once the captive-bred larvae are 3 to 8 years old, they can then be released into their natural habitat—the Ozark aquatic ecosystem.

Also known by the colloquial names of "snot otter" and "old lasagna sides," the adult hellbender is one of the largest species of salamanders in North America, with its closest relatives being the giant salamanders of China and Japan, which can reach five feet in length.

With skin that is brown with black splotches, the Ozark hellbender has a slippery, flattened body that moves easily through water and can squeeze under rocks on the bottom of streams.

Like a Canary in a Coal Mine

Requiring cool, clean running water, the Ozark hellbender is also an important barometer of the overall health of that ecosystem—an aquatic "canary in a coal mine."

"Capillaries near the surface of the hellbender's skin absorb oxygen directly from the water – as well as hormones, heavy metals and pesticides," said Jeff Ettling, Saint Louis Zoo curator of herpetology and aquatics. "If there is something in the water that is causing the hellbender population to decline, it can also be affecting the citizens who call the area home."

"We have a 15- to 20-year window to reverse this decline," added Missouri Department of Conservation Herpetologist Jeff Briggler, who cites a number of reasons for that decline from loss of habitat to pollution to disease to illegal capture and overseas sale of the hellbender for pets. "We don't want the animal disappearing on our watch."

Reversing A Decline

In 2001, the Ozark Hellbender Working Group of scientists from government agencies, public universities and zoos in Missouri and Arkansas launched a number of projects to staunch that decline. These included egg searches, disease sampling and behavioral studies.

In 2004, funding from private donors, the Missouri Department of Conservation, the United States Fish & Wildlife Services and the Zoo covered the cost of building sophisticated facilities including climate-controlled streams to breed the hellbender.

The hellbender propagation facilities include two outdoor streams that are 40 feet long and six feet deep. The area is landscaped with natural gravel, large rocks for hiding and artificial nest boxes, where the fertilized eggs were discovered. A nearby building houses state-of-the-art life support equipment used to filter the water and maintain the streams at the proper temperature.

In addition, two large climate-controlled rooms in the basement of the Zoo's Charles H. Hoessle Herpetarium are the headquarters for the program. The facilities recreate hellbender habitat with closely monitored temperatures, pumps to move purified water, sprinklers synced to mimic the exact precipitation and lights that flick on or dim to account for brightness and shade. The largest room includes a 32-foot simulated stream, complete with native gravel and large rocks for hiding. It houses a breeding group of adult Ozark hellbenders from the North Fork of the White River in Missouri; offspring from these hellbenders will eventually be released back into the wild.

You can see video of the hellbender larvae on You Tube