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| Marsh frog | |
|---|---|
| Name | Marsh frog |
| Status | LC |
| Status system | IUCN3.1 |
| Genus | Pelophylax |
| Species | ridibundus |
| Authority | (Pallas, 1771) |
Marsh frog is a large Eurasian frog species notable for its loud call and semi-aquatic habits. It occupies freshwater wetlands across parts of Europe, Western Asia, and has established populations in Great Britain and other introduced regions. The species is widely studied in fields ranging from herpetology and ecology to invasive species management and conservation biology.
Originally described by Peter Simon Pallas in 1771, the species is placed in the genus Pelophylax within the family Ranidae. Taxonomic treatments have alternately used the genus Rana and have been influenced by molecular studies from research groups at institutions such as the Natural History Museum, London and the Smithsonian Institution. Nomenclatural history intersects with regional faunal works like those of the Fauna Europaea project and checklist efforts led by the International Union for Conservation of Nature.
Adults reach lengths exceeding many congeners, with males and females showing sexual dimorphism commonly reported in surveys by the Zoological Society of London and universities such as University of Cambridge. Coloration ranges from olive-green to brown with darker markings; skin texture can be smooth or slightly warty as documented in field guides from the British Herpetological Society and the European Amphibian and Reptile Conservation Network. Distinctive features include a pronounced dorsolateral fold and a large tympanum, characters used in identification keys produced by the Royal Society publishing and regional museums like the Natural History Museum of Vienna.
Native range extends across Eastern Europe, the Balkans, Turkey, and parts of Western Asia, with introduced populations reported in Great Britain, Ireland, and sections of Scandinavia following accidental or deliberate translocations recorded by agencies such as the Environment Agency (England) and the Joint Nature Conservation Committee. Preferred habitats include lowland freshwater bodies—ponds, marshes, ditches, and slow-flowing rivers—habitats surveyed by bodies like the Ramsar Convention and local conservation NGOs including Amphibian and Reptile Conservation (ARC). The species can tolerate eutrophic waters, a trait noted in ecological assessments by the European Environment Agency.
Mostly nocturnal and crepuscular, individuals forage for invertebrates and small vertebrates, feeding patterns reported in dietary studies from research teams at University of Oxford and University of Warsaw. Vocal behavior includes a conspicuous advertisement call used in mate attraction and territorial displays, acoustically characterized in publications by the Acoustical Society of America and bioacoustic labs at University College London. Predation pressures involve piscivorous birds documented by ornithologists at the British Trust for Ornithology and mammalian predators noted in reports by the Mammal Society. Parasites and pathogens, including chytrid fungi discussed by researchers at the Global Bd-Mapping Project and viral agents studied at the Pasteur Institute, affect populations variably across regions.
Breeding occurs seasonally in temperate climates, with males establishing calling sites in vegetation and open water, behaviors documented in reproductive ecology studies from University of Helsinki and the Max Planck Society. Females lay large clusters of eggs attached to submerged plants; larval development proceeds through a tadpole stage with metamorphosis timing influenced by temperature and resource availability, variables examined in experiments at the Fresco Lab and university departments such as Charles University in Prague. Life-history parameters including age at maturity and longevity have been reported in longitudinal studies by the Institute of Zoology.
Globally assessed as Least Concern by the IUCN Red List based on wide distribution and large population, regional trends vary with threats identified by conservation bodies like the European Red List of Amphibians. Habitat loss from drainage and agricultural intensification, pollution from agrochemicals monitored by the European Commission, invasive competitors studied by the Centre for Ecology & Hydrology, and disease emergence documented by the World Organisation for Animal Health contribute to local declines. Management actions promoted by organizations such as the Convention on Biological Diversity and national agencies include habitat restoration, biosecurity measures, and population monitoring programs.
The species features in cultural natural history accounts held in collections at the British Museum and educational materials from institutions like the Natural History Museum, London and the Smithsonian Institution. Introductions have prompted policy responses from environmental regulators such as the Environment Agency (England) and NGO-led eradication or control efforts by groups including Amphibian and Reptile Conservation (ARC). Scientific use spans behavioral studies in laboratories at University College London, ecotoxicology experiments at ETH Zurich, and community science projects coordinated by platforms like the National Biodiversity Network.
Category:Pelophylax Category:Amphibians described in 1771