A threatened species is any species which is vulnerable to extinction in the near future. Species that are threatened are sometimes characterised by the population dynamics measure of critical depensation, a mathematical measure of biomass related to population growth rate. This quantitative metric is one method of evaluating the degree of endangerment without direct reference to human activity.
The conservation status of a group of organisms indicates whether the group still exists and how likely the group is to become extinct in the near future. Many factors are taken into account when assessing conservation status: not simply the number of individuals remaining, but the overall increase or decrease in the population over time, breeding success rates, and known threats. Various systems of conservation status are in use at international, multi-country, national and local levels, as well as for consumer use such as sustainable seafood advisory lists and certification. The two international systems are by the International Union for Conservation of Nature (IUCN) and The Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES).
The canebrake tree frogs are a frog genus Aplastodiscus. They are in the family Hylidae. Residing primarily in southeast regions of Brazil near the Atlantic coast. The exception is the Aplastodiscus perviridis which is found mostly in Brazil, but has also been documented being in Argentina, and might reside in Paraguay. The major revision of the Hylidae genus expanded it to include 12 more species originally from Hyla. Before the revision there were only 2 species. There are currently 16 described species with the most recent addition Aplastodiscus heterophonicus being described in 2021.
Corydoras ehrhardti is a tropical freshwater fish belonging to the Corydoradinae sub-family of the family Callichthyidae. It originates in coastal rivers in the Santa Catarina and Paraná states of Brazil from the Iguazu River basin.
A conservation-dependent species is a species which has been categorized as "Conservation Dependent" ("LR/cd") by the International Union for Conservation of Nature (IUCN), as dependent on conservation efforts to prevent it from becoming endangered. A species that is reliant on the conservation attempts of humans is considered conservation dependent. Such species must be the focus of a continuing species-specific and/or habitat-specific conservation program, the cessation of which would result in the species qualifying for one of the threatened categories within a period of five years. The determination of status is constantly monitored and can change.
A near-threatened species is a species which has been categorized as "Near Threatened" (NT) by the International Union for Conservation of Nature (IUCN) as that may be vulnerable to endangerment in the near future, but it does not currently qualify for the threatened status.
An IUCN Red List Critically Endangered species is one that has been categorized by the International Union for Conservation of Nature as facing an extremely high risk of extinction in the wild. As of December 2023, of the 157,190 species currently on the IUCN Red List, 9,760 of those are listed as Critically Endangered, with 1,302 being possibly extinct and 67 possibly extinct in the wild.
A species that is extinct in the wild (EW) is one that has been categorized by the International Union for Conservation of Nature as only consisting of living members kept in captivity or as a naturalized population outside its historic range. Classification requires exhaustive surveys conducted within the species' known habitat with consideration given to seasonality, time of day, and life cycle. Once a species is classified as EW, the only way for it to be downgraded is through reintroduction.
Aplastodiscus albofrenatus is a species of frog in the family Hylidae, endemic to Brazil. Its natural habitats are subtropical or tropical moist lowland forests, rivers, plantations, rural gardens, and heavily degraded former forests. It is threatened by habitat loss.
Aplastodiscus albosignatus, also known as the Bocaina treefrog, is a species of frog in the family Hylidae. It is endemic to Brazil. Its natural habitats are subtropical or tropical moist lowland forests, subtropical or tropical moist montane forests, and rivers. It is threatened by habitat loss.
Aplastodiscus arildae is a species of frog in the family Hylidae. It is endemic to Brazil. Its natural habitats are subtropical or tropical moist lowland forests and rivers.
Aplastodiscus cochranae is a species of frog in the family Hylidae. It is endemic to the coastal mountains of Santa Catarina, Brazil. The specific name cochranae honors Doris Mable Cochran, an American herpetologist. Common name canebrake treefrog has been coined for this species.
Aplastodiscus flumineus is a species of frog in the family Hylidae. It is endemic to Brazil. Its natural habitats are subtropical or tropical moist montane forests and rivers. It is threatened by habitat loss.
Aplastodiscus leucopygius is a species of frog in the family Hylidae, endemic to Brazil. Its natural habitats are subtropical or tropical moist lowland forests, rivers, intermittent freshwater marshes, plantations, rural gardens, heavily degraded former forests, and irrigated land.
Aplastodiscus musicus is a species of frog in the family Hylidae. It is endemic to Brazil. Its natural habitats are subtropical or tropical moist montane forests and rivers. It is threatened by habitat loss.
Aplastodiscus perviridis is a species of frog in the family Hylidae. It is found in Argentina, Brazil, and possibly Paraguay. Its natural habitats are subtropical or tropical moist lowland forests, subtropical or tropical moist montane forests, subtropical or tropical moist shrublands, subtropical or tropical dry lowland grasslands, rivers, and freshwater marshes.
Aplastodiscus sibilatus is a species of frog in the family Hylidae. It is endemic to northeastern Brazil and is known from central-eastern Bahia and Alagoas. The specific name sibilatus is derived from the Latin sibilus meaning "whistle", in allusion to the characteristic call of the species.
Aplastodiscus ibirapitanga is a species of frog in the family Hylidae. Its natural habitats are subtropical or tropical moist lowland forests, subtropical or tropical moist montane forests, and rivers. It tolerates some habitat modification and is not considered threatened.
A vulnerable species is a species which has been categorized by the International Union for Conservation of Nature as being threatened with extinction unless the circumstances that are threatening its survival and reproduction improve.
Endangered species, as classified by the International Union for Conservation of Nature (IUCN), are species which have been categorized as very likely to become extinct in their known native ranges in the near future. On the IUCN Red List, endangered is the second-most severe conservation status for wild populations in the IUCN's schema after critically endangered. In 2012, the IUCN Red List featured 3,079 animal and 2,655 plant species as endangered worldwide. The figures for 1998 were 1,102 and 1,197 respectively.
