Knowra Amphibian Amphibian An amphibian is a vertebrate in the class Amphibia, including frogs, salamanders, and caecilians. Many species develop through aquatic larval stages into adults adapted for life on land.
Amphibia : The tetrapod vertebrate class comprising frogs, salamanders, and caecilians, along with their extinct relatives. This taxonomic class names the group to which every amphibian belongs.
Cutaneous respiration : Gas exchange through an animal’s skin rather than, or in addition to, lungs or gills. Many amphibians absorb oxygen and release carbon dioxide through their moist skin.
Bioindicator : An organism whose condition or presence provides evidence about environmental quality or change. Amphibian declines can signal pollution, habitat disruption, or emerging disease.
Tetrapod transition : The evolutionary shift in vertebrate lineages from aquatic life toward movement and reproduction on land. Amphibian ancestry is tied to early vertebrate transitions onto land.
Trophic cascade : An ecological chain reaction in which changes at one trophic level affect other levels. Amphibian losses can alter predator and prey populations in connected food webs.
Anura : The amphibian order containing frogs and toads, typically with adults lacking tails. Frogs and toads form the largest living amphibian order.
Amphibian skin : The thin, glandular, permeable integument characteristic of amphibians. Its permeability supports gas exchange but also makes water balance vulnerable.
Amphibian chytridiomycosis : A potentially lethal amphibian disease caused by chytrid fungi, including Batrachochytrium dendrobatidis. This disease has driven severe declines across numerous amphibian populations.
Acanthostega : An extinct Devonian tetrapod with limbs and digits that remained strongly adapted to aquatic life. Its fossils show that limbs and digits evolved before fully terrestrial life.
Ecosystem services : Benefits people obtain from ecosystems, including food, water regulation, and biological control. Amphibians consume many invertebrates and serve as prey for other wildlife.
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