Sunday, July 8, 2012

Poison Dart Frog


The Life of Animals | Poison Dart Frog | Most dart frog species of venomous are small, sometimes less than 1.5 cm (0.59 inches) in length for adults, although some grow to 6 cm (2.4 inches) in length. Weigh approximately 2 grams, depending on the size of the frog. Most poison dart frogs are color images, aposematic display to warn potential predators. The frogs such as Dendrobates species have high levels of alkaloids, while Colostethus species are cryptically colored and non-toxic. Poison frogs are an example of an aposematic organism. Their bright coloration advertises appetite potential predators. Adult frogs lay their eggs in moist places, such as leaves, plants, among exposed roots, and elsewhere. The poison arrow frog is an amphibian.

The tadpoles remain until metamorphosis, fed unfertilized eggs at regular intervals established by the motherPoison frogs are endemic to the humid tropics of Central America and Latin America (South America). These frogs are usually found in tropical forests in Bolivia, Costa Rica, Brazil, Colombia, Ecuador, Venezuela, Suriname, Guyana, Peru, Panama, Guyana, Nicaragua and Hawaii (introduced). Natural habitats include subtropical or tropical moist forests of the lowlands, tall bushes subtropical or tropical moist, subtropical or tropical Montanes and rivers, freshwater marshes, intermittent freshwater marshes, lakes and swamps.

Many species of poison dart frogs are dedicated parents. Tadpoles feed on invertebrates in tree nursery, and his mother also supplement their diet by depositing their eggs in water. Other poisonous frogs lay their eggs on the forest floor, hidden under layers of leaves. Poison frogs fertilize the eggs externally, ie, the female lays a clutch of eggs the male fertilizes them later in the same way that fish (external fertilization). Poison frogs can often be seen hugging, like most frogs copulating. The operational sex ratio in the poison dart frog family is largely avoided women.

Females select mates based on color (mostly dorsal) position calling perch, and the territory Some species of poison dart frogs include a number of color forms species that have emerged recently as 6,000 years ago. A previous study on the evolution of skin coloration and toxicity of the family Dendrobatidae indicated that the development of skin toxicity was significantly correlated with the evolution of bright coloration. In support of this research, another study went on to explain that the color was visible also significantly correlated with dietary specialization of a poison frog, their body mass and chemical defense. This study has found that polymorphic poison dart frogs, which are less visible are more toxic than the brightest and most visible species, sequestration of alkaloids in frogs has been less visible considered strong convulsion proposed as an explanation for this result. Many species of poison dart frogs have recently experienced the loss of habitat (due to logging and agriculture) and chitridi diseases.
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