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Kaulquappen in einem Bergsee
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Flüchtende Kaulquappe in einem Bergsee
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Titel: Tadpoles in a mountain lake
Aufnahmestandort:

In the Schwarzmoossee, north of Kühtai, Tyrol.

Beschreibung:

A tadpole or polliwog (also pollywog, polliwig, polewig, or polwig) is the wholly aquatic larval stage in the life cycle of an amphibian.

During the tadpole stage of the amphibian life cycle, most respire by means of autonomous external or internal gills. They do not usually have arms or legs until the transition to adulthood, and typically have dorsal or fin-like appendages and a tail with which they swim by lateral undulation, similar to most fishes.

As tadpoles mature, they most commonly metamorphosize by gradually growing limbs and then (most commonly in the case of frogs) outwardly absorbing its tail by apoptosis. Lungs develop around the time of leg development and tadpoles late in development will often be found near the surface of the water where they breathe air. During the final stages of external metamorphosis, the tadpole's mouth changes from a small enclosed mouth at the front of the head to a large mouth the same width as the head. The intestines shorten to make way for the new diet. citation needed Most tadpoles are herbivorous, subsisting on algae and plants. Some species are omnivorous, eating detritus and, whenever available, other tadpoles. citation needed.

An exception to the rule distinct differences between the tadpole (juvenile) and adult (frog, toad, salamander etc) stages is the axolotl. Axolotls exhibit a property called neoteny, meaning that they reach sexual maturity without undergoing metamorphosis.

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Schlüsselwörter: lake, water, grog
Bilddaten
Image sizes: 3456*2304px, 3801kb
Origin: Originally a digital image, with postprocessing
Date/Time: 20081012-115645
Camera: Canon EOS 350D DIGITAL
Iso: 400
Speed: 1/200s
Focal length: 85.0mm
Aperture: 136mm
Destination coordinates WGS84 LONG 11.0156607628°, LAT 47.2272370466°
Author: André M. Winter
Photo copyright: This photograph is copyrighted (©) by André M. Winter and others. A free permissions for re-use may be given for non-commercial purposes. Commercial use requires a license. Contact André M. Winter for any kind of use. This extended copyright notice applies in all cases. Infringements always will be persecuted worldwide. Legal court: Innsbruck, Austria, E.U.
Text copyright: The description of this photograph (or parts of) is based on this article of the free Wikipedia encyclopedia and are covered by the GNU Free Documentation License (GFDL). Authors are named on the Wikipedia page.
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