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Archive for the ‘Salamanders’ Category

Hellbenders – Unique Jurassic Survivors

Sunday, June 12th, 2011

The other day my husband asked if I wanted to go see hellbenders at a state park in Pennsylvania. I knew that hellbenders were salamanders, but I didn’t know much else about them. So I thought I’d learn something about them before we go in search of these unique creatures.

Eastern Hellbenders (Cryptobranchus allegoniensis), the only member of the giant salamander family found in North America, are large aquatic salamanders that can grow from 10 to 20 inches in length. They have wrinkled skin and their color varies from spotted yellowish to red and brown.

The Eastern Hellbender lives in fast-flowing, cold streams with rocky bottoms from southern New York to northern Georgia, but are most abundant in Pennsylvania, West Virginia, and Virginia. They are primarily nocturnal and spend most of their day hiding under logs or rocks. They like to eat snails and crayfish and are partial to worms, which sometimes leads to encounters with fishermen.

There are two common misconceptions surrounding this aquatic salamander—that it’s poisonous and that it spreads a slime on fishing lines that drives away fish. Both are untrue. The hellbender is harmless. But these misconceptions have led to nicknames such as devil dog and Allegheny alligator.*

Hellbenders have an interesting reproductive process. They mate late in the summer and the male then digs a shallow nest in the stream bottom beneath a log or rock. A female deposits 100 to 200 eggs in the nest as the male releases sperm to fertilize them. Dad then guards the nest for two to three months until the young hatch.

Hellbenders are considered a living fossil. They haven’t changed much since the Jurassic times, over 160 million years ago, which means they’ve been on Earth about 60 million years longer than humans. But human activity is causing them to decline dramatically in most areas.

Some causes for their decline include blocking of the animals’ migration routes, destruction of their aquatic habitat by dams and other development, as well as pollution, disease, and over harvesting for commercial and scientific purposes.

Here’s a National Geographic video about the hellbender. I wouldn’t try this at home (licking a salamander), but it does remind one that tasting really really bad is one of the defenses of animals like hellbenders.

Unike the hellbender in the video above, the hellbender in this video has been left undisturbed and despite its name, I think the hellbender is quite beautiful when you see it in its natural habitat:

*Most of the information in this post came from Longstreet Highroad Guide to the Pennsylvania Mountains by Greg and Karen Czarnecki.

The Olm – Earth’s Weirdest Salamander

Saturday, May 28th, 2011

We began this post  as “The 10 Weirdest Salamanders and Newts,” but never got past what may be the weirdest salamander of them all: the Olm (Proteus anguinus), a blind amphibian native to the subterranean waters of caves of southern Europe. This animal is so strange and interesting, it deserves a post of its own. (The 10 Weirdest Salamander post will follow soon.)

The Olm lives in subterranean aquatic habitats within the Dinaric Alps in the countries of Bosnia and Herzegovina, Italy, Slovenia, and Croatia. It is the  the only European species of the family Proteidae, an ancient family of salamanders, and is Europe’s only cave-adapted vertebrate (animal with a backbone).

The Olm lives in complete darkness and is a great example of the evolutionary principle of “use it or lose it,” or more accurately, the principle of why waste energy on something if you never use it. When they are young, Olm have normal eye development. But as the animal matures, the eyes disappear under its skin because it doesn’t need them. Although the animal is blind, their eyes (even under skin) are sensitive to light.

© Arne Hodalič, courtesy of EDGE

The Olm’s other senses, particularly those of smell and hearing, are highly developed. It can sense sound waves in the water and vibrations on land. It may also use Earth’s magnetic field to orient itself, detecting electric fields in a way similar to sharks.

In another case of use it or lose it, the Olm has no pigmentation in its skin. Its yellowish-white or pink skin is never exposed to the sun, or light of any kind. But its skin is still able to produce melanin. When exposed the light, the animal will turn darker.

Unlike most amphibians that live a double life—in water and on land—the Olm is entirely aquatic. It swims by twisting its snake-like body like an eel, helped by its poorly developed legs.

The Olm doesn’t go through metamorphosis like most other amphibians. Instead it keeps the features of its larval stage, like external gills, which form two branched tufts at the back of its head. Because of its aquatic lifestyle, it also retains its tail fin and lacks eyelids. The Olm has only three fingers on its forelimbs and two toes on its hindlimbs.

The Olm feeds on small crabs, snails and sometimes insects. Food can sometimes be scarce in a cave, but that’s not a problem for the Olm. It can eat large amounts of food at once, and store the nutrients. When food is scarce, it becomes less active and its metabolism slows down. Controlled experiments have shown that an Olm can survive up to 10 years without food!

The Olm has a surprisingly long life for an amphibian. It has a maximum lifespan of over 100 years; the lifespan of an average adult is around 68.5 years.

According to the EDGE website, there are many threats to the Olm, several of which are similar to threats to other amphibians: water pollution, overdevelopment, illegal collection for the pet trade, hydroelectric damming schemes, and casual and uncontrolled dumping of domestic and industrial garbage, among many other threats.

In Slovenia, the Olm is considered to be a national treasure. In 1982, the Olm was placed on a list of rare and endangered species, which also prohibits the trade of the species. It is also somewhat protected in Croatia, and in Bosnia and Herzegovina

The Olm is listed on the IUCN Red List as vulnerable because of its fragmented and limited distribution and ever-decreasing population.

To learn more about the Olm, please visit the Evolutionarily Distinct and Globally Endangered (EDGE) website.