Frogs are a very common type of amphibian and widely distributed throughout the planet. They depend to a great extent on water, since they need it to breathe, and their life cycle includes several different phases, well distinguishable and that can vary from one species to another. Like all species, they are a fundamental factor in maintaining the balance of their ecosystems.
In Green Ecologist we give you the keys so that you know the main points of the life cycle of a frog and we help you to know the reason for these phases. In addition, you will be able to see images of each phase and of the cycle.
As a summary, we can indicate that the life cycle of a frog has the following stages or phases, starting from the moment of reproduction and the laying of the eggs:
From this last point, the life cycle of frogs begins again with the first point. An adult frog reproduces several times throughout its life until it dies.
Below, apart from finding the description of each phase or stage, you can see pictures of the life cycle of a frog.
Frogs, like everyone amphibians, are oviparous animals, that is, they have a sexual reproduction using eggs. Frog eggs are characterized by having a large amount of yolk, which is a reserve of nutrients that the embryo will use to complete its development. This yolk has bilateral symmetry.
Frogs also use a reproductive strategy consisting of lay a lot of eggs and then not investing much effort in caring for and protecting the young, in the hope that, although many die due to lack of protection, at least several will reach adulthood. In ecology this is known as "R strategists" or "R reproductive strategy. Eggs, moreover, are usually submerged in rafts of water and protected by some type of mucilage or gelatinous substance that holds them together.
The embryonic development of the frog it is common with that of other amphibians. Some of the most important stages are:
When are frog tadpoles born? Very easy, when the entire embryonic period has concluded. Once the tadpole is perfectly formed and able to survive on its own in the wild, the eggs hatch and the frog tadpoles emerge into the water. It is no coincidence that frog eggs are submerged or very close to water: tadpoles need it to live, that is, at this stage they would not survive on dry land. The tadpole has the appropriate characteristics for this life: it has a caudal or tail fin, it lacks lateral appendages and its respiratory system is of the branchial type.
In ecology, it is estimated that the species that undergo metamorphosis, among others, do so to avoid competition from adults with their own offspring, occupying different ecological niches. In general, tadpoles live in water and are herbivores, while frogs live on the periphery of the water and have a more extensive diet.
The characteristics that occur in the metamorphosis phase of the tadpole must disappear to give rise to the adult specimen. Begins the frog metamorphosis, in which the tadpole will undergo at least the following changes:
Once all the necessary changes have been achieved, and remembering that many of the young will have died along the way, adult individuals surface. It is then when the ecological niche changes: they begin to live between the earth and the water and hunt for food.
To complete the life cycle, we need fertile adults who can lay new consignments of eggs. The reproduction of frogsIn many cases, it includes complex courtship rituals to get sexual partners.
Furthermore, the copulation of frogs is often called "amplexus", since the male covers the female and holds her under the forelimbs. It is a characteristic of many of the amphibians.
Once we have a fertilized female, she will deposit her eggs in a pool of water, thus closing the life cycle of a frog.
To learn more about these amphibian animals, we invite you to read these other articles on What animals are amphibians and where they are found, How amphibians breathe and Why do frogs rain from the sky.
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