The word amphibians comes from the Greek ’ ἀμφίβιος amphíbios . The translation of this phrase literaly means “both lifes”, meaning that creatures can live both in water and on land. Amphibians start their life in water, but they spend the most of their lives on land.
Amphibians reproduce by eggs which are laid by the female. These eggs are most often laid in fresh water, but there are certain species such as the “Fejervarya raja” which can survive even in slightly salted areas. There are 3 main ways of reproduction: External Fertilization- when the male holds the female in a specific position and releases the sperm over the eggs immediately when the female lays them. Many salamanders reproduce through this way. The male deposits a certain amount of sperm, which the female later accepts in her cloaca. Caecilinias and tailed frogs deposit sperm directly into the female, fertilizing the eggs.
The main tool which amphibians use is their colorization. Different pigments in their skin cause them to form a natural disguise which protects them from predators. Amphibians can jump, when chased in this way causing the predator to lose sight and scent. Salamanders can run very fast, in this way easily escaping enemies. Some of the techniques which the amphibians use when encountering an enemy: Enlarge their body, feign death, show aggressive colorization Various kinds of amphibians have skin toxins which can cause damage to their opponents.
Ambystoma tigrinum is the other name for it. Reaches 15-20cm, its colorization is a mixture of green, black and grey. Live entire life on land, return to water only to breed, their habitat is underground, they can’t be seen often above ground. They chose to live in hot and dry grasslands. The tiger salamander waits for its prey until it can reach it and then captures it with its mouth. Beetles, earthworms, snails, mice and frogs are some of the targets which salamanders attack. Interesting fact: if there is not sufficient food in the pond, some of the salamander larvae can become “cannibals” and eat other larvae from their own kind. Have the ability to accept moisture through their skin
Amphibians Mila Daskalova Dimitar Satchansky Lewbina Ilkova 10/3
Heart contains a ventricle and two atria, the single ventricle meaning not high efficiency of the system
In the ventricle oxygenated and deoxygenated blood are not mixed due to a specific mechanism of contractions of the two atria at different times
Skin is respiratory organ through which amphibians absorb additional oxygen. However, it works in the same mechanism as gills, and requires constant moisture (2)
Protection Various kinds of protection -Colorization (7) -Jumping (by some frogs) (7) -Fast movement( by salamanders) (7) -Enlargement of the body, feign death (7) -Skin toxins (7) http://images.livescience.com/images/071030-leaf-frog-04.jpg
Tiger Salamander *Abystoma tigrinum, reaches 15-20sm, colored in green, black and grey(5) *Entire life on land, only breed in water, mainly live underground.(5) *Live in hot and dry grasslands(5) *Waits for its prey and captures it with mouth( beetles, earthworms, snails, mice)(5) *If there is not enough food for the larvae they can turn to “canibalism” (5) http://animals.nationalgeographic.com/staticfiles/NGS/Shared/StaticFiles/animals/images/primary/tiger-salamander.jpg http://mylittlebubble.me/wordpress/wp-content/uploads/2009/08/tiger_salamander_380.jpg