| Pool frog | |
|---|---|
 | |
Scientific classification  | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Amphibia |
| Order: | Anura |
| Family: | Ranidae |
| Genus: | Pelophylax |
| Species: | P. lessonae |
| Binomial name | |
| Pelophylax lessonae (Camerano, 1882) | |
| Synonyms [2] | |
| |
The pool frog (Pelophylax lessonae) is a European frog in the family Ranidae. Its specific name was chosen by the Italian herpetologist Lorenzo Camerano in 1882, in order to honour his master Michele Lessona.
The pool frog is a small frog which rarely grows to more than 8 cm (3.1 in) long, although females can grow up to 9 cm (3.5 in). Males are typically around 5 cm (2.0 in) long, while females are around 6–6.5 cm (2.4–2.6 in) long. These frogs are brown or green, with dark blotches along their backs, a pair of ridges running from each eye and a cream or yellow stripe down the middle of the frog's back. The vocal sacs on the male are cream or even white. [4]
The pool frog is found across most of central Europe from the west coast of northern France to the Western part of Russia. There are also small populations of pool frogs in the United Kingdom, Spain, Sweden and Norway. [1] Pool frogs were previously thought to be a non-native species in the UK, but studies have shown that English pool frogs are related to the Swedish and Norwegian populations. [4]
The pool frog is found in damp areas with dense vegetation, or in calm, slow flowing rivers, ponds, bogs or marshes. [4]
According to Amphibiaweb populations of this frog survive in urban areas and even fisheries. The creation of new ponds and other bodies of water leads to increased dispersal and a growth in the population of these frogs. [5]
Pelophylax lessonae is one of only four amphibian species recognized by the UK government as protected under its Biodiversity Action Plan. The reasons for declining populations are decreased pond habitat from human encroachment and also air pollution leading to over-nitrification of pond waters.
The pool frog has not always been recognised as a native British species. Part of the reason for this is that specimens are known to have been introduced from southern Europe (though not from Scandinavia). However research has now shown that the potentially native UK pool frogs are closely related to Scandinavian frogs, not to frogs from further south. A native origin is most likely. [6]
The Herpetological Conservation Trust website states that "The Pool Frog is a European frog and was formerly recorded from two sites in East Anglia although it was lost from one of these in the middle of the 19th century. It was presumed extinct in the wild at the last remaining site by 1995. A single individual known from this population survived in captivity until 1999. Other populations have become established in the UK and it is known that some of these included individuals of British origin in their founding stock."
An English Nature reintroduction project is underway in Breckland, where pool frogs were introduced to a single site in 2005.
The edible frog Pelophylax kl. esculentus is a hybridogenetic hybrid of the pool frog Pelophylax lessonae and the marsh frog P. ridibundus. Its populations are maintained however through other crossings by hybridogenesis. [7]
The edible frog is a hybrid species of common European frog, also known as the common water frog or green frog.
The European tree frog is a small tree frog. As traditionally defined, it was found throughout much of Europe, Asia and northern Africa, but based on molecular genetic and other data several populations formerly included in it are now recognized as separate species, limiting the true European tree frog to Europe from France to Poland and Greece.
The marsh frog is a species of water frog native to Europe and parts of western Asia.
The pickerel frog is a small North American frog, characterized by the appearance of seemingly "hand-drawn" squares on its dorsal surface.
The agile frog is a European frog in the genus Rana of the true frog family, Ranidae.
The Levant water frog or Bedriaga's frog, formerly belonging to the genus Rana, is a southern European species of frog. They are green to brown in color with dark blotches on their dorsal side. They are cousins of the aquatic frogs and live most of the time in the water. They are not poisonous and are quite large, especially the females. It has been introduced in some countries where it was not native, one of which is Malta. First kept as a pet, then recently during the 1990s, it was deliberately introduced to a number of fresh water rock pools in Gozo, where in one it sustains a large population. Though a prolific and invasive species, it is restricted to constant fresh water supply, so it cannot spread naturally on its own on arid Mediterranean islands.
Pelophylax demarchii is a species of frog in the family Ranidae. It is only known from its unspecific type locality, Eritrea. Its taxonomic status is unclear. Common name Eritrea pond frog has been coined for it.
The Albanian water frog is a species of true frog and is native to Albania and Montenegro. As its common name suggests, it prefers aquatic environments. The Albanian water frog is an endangered species and known populations are currently in decline. Significant threats to its habitat are presented by pollution and by drainage of wetlands, and a more direct threat is the aggressive collection of the species for commercial purposes.
Discoglossus pictus, the Mediterranean painted frog or simply painted frog, is a species of frog in the family Alytidae.
Pelophylax is a genus of true frogs widespread in Eurasia, with a few species ranging into northern Africa. This genus was erected by Leopold Fitzinger in 1843 to accommodate the green frogs of the Old World, which he considered distinct from the brown pond frogs of Carl Linnaeus' genus Rana.
The fertile hybrids of European water frogs reproduce by hybridogenesis (hemiclonally). This means that during gametogenesis, they discard the genome of one of the parental species and produce gametes of the other parental species. The first parental genome is restored by fertilization of these gametes with gametes from the first species. In all-hybrid populations of the edible frog Pelophylax kl. esculentus, however, triploid hybrids provide this missing genome.
Leszek Berger was a Polish herpetologist and malacologist.
Pelophylax caralitanus, commonly known as the Anatolian frog or Beyşehir frog, is a species of frog in the family Ranidae. It is endemic to southern Turkey and is considered vulnerable to extinction by the International Union for Conservation of Nature (IUCN).
Celtic Rewilding, formally known as Celtic Reptile & Amphibian, is a conservation company, established in 2020, by Harvey Tweats and Tom Whitehurst, with the initial aim of reintroducing extinct reptiles and amphibians back to rewilding projects within the UK. However, the company's scope has since broadened to all lost species of the UK and northern Europe. It is based in Leek, Staffordshire.
