Unique among the brown frogs of the genusRana, the larvae of Rana sauteri have a distinctive appearance and behaviour (3). First described by Boulenger in 1909, Rana sauteri is a small-sized, brown frog (4)(5). Due to their close morphological similarities, brown frogs are notoriously difficult to distinguish (6). However, unlike most brown frogs, the digit tips of Rana sauteri have discs and horizontal grooves, an adaptation to life in fast-running water (3), earning its alternative common name of the Taiwan groove-toed frog (7).
The female Rana sauteri tends to be significantly larger than the male (8). The Rana sauteri tadpole is highly pigmented, has a flat body, large mouthparts, an abdominal sucker and a stout tail (3)(9).
Rana sauteri is known to breed between October and April (3). The mature adult generally joins large breeding aggregations in fast-flowing streams, but has also been found in still-water pools. Eggs are usually found under submerged rocks at depths of 10 to 15 centimetres (8).
Rana sauteri feeds mainly on arthropods, especially insects. This species shows a preference for certain prey items and does not forage randomly (12).
The Rana sauteri tadpole is extremely specialised for survival in fast-flowing water. Its morphology is unusual among brown frogs because it has a large abdominal sucker which allows it to cling to rocks in streams. It feeds on algae growing on the surface of rocks (3).
Rana sauteri is endemic to western Taiwan, where it can be found in lowland areas between elevations of 170 and 500 metres above sea level (1). High-altitude populations of the brown frog in this region are now considered a separate species, Rana multidenticulata(10).
Rana sauteri inhabits low-altitude hill forests and nearby small streams (11). During winter, Rana sauteri is usually found under stones in small streams and in hollows under banks. In summer, it is often found on the forest floor rather than in water (3).
Currently this species is relatively common, but its numbers are declining. It is primarily threatened by habitat loss due to agriculture and industry (11). Furthermore, Rana sauteri is also potentially threatened by the chytrid fungus responsible for chytridiomycosis, an emerging infectious disease which is detrimental to amphibian species (13).
Simple plants that lack roots, stems and leaves but contain the green pigment chlorophyll. Most occur in marine and freshwater habitats.
A major grouping of animals that includes crustaceans, insects and arachnids. All arthropods have paired jointed limbs and a hard external skeleton (exoskeleton).
A species or taxonomic group that is only found in one particular country or geographic area.
A category used in taxonomy, which is below ‘family’ and above ‘species’. A genus tends to contain species that have characteristics in common. The genus forms the first part of a ‘binomial’ Latin species name; the second part is the specific name.
Immature stage in an animal’s lifecycle, after it hatches from an egg and before it changes into the adult form. Larvae are typically very different in appearance to adults; they are able to feed and move around but are usually unable to reproduce.
Referring to the visible or measurable characteristics of an organism.
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Kuramoto, M., Wang, C.S. and Yu, H.T. (1984) Breeding, larval morphology and experimental hybridization of Taiwanese brown frogs, Rana longicrus and R. sauteri. Journal of Herpetology, 18: 387-395.
Boulenger, G.A. (1909) Descriptions of four new frogs and a new snake discovered by Mr. H. Sauter in Formosa. Annals and Magazine of Natural History, 8: 492-495.
Lai, S.J., Kam, Y.C., Hsu, F.H. and Lin, Y.S. (2002) Elevational effects on the growth and development of tadpoles of Sauter’s frog Rana sauteri. Acta Zoologica Taiwanica, 13: 11-20.
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Dubois, A. (1992) Notes sur la classification des Ranidae (Amphibiens Anoures). Bulletin mensuel de la Société linnéenne de Lyon, 61: 305-352.
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Chou, W.H. and Lin, J.Y. (1997) Geographical variations of Rana sauteri (Anura: Ranidae) in Taiwan. Zoological Studies, 36: 201-22.
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Jhang, W.H. and Wu, S.H. (2009) Food habits of three stream-living frogs (Bufo bankorensis, Odorrana swinhoana, and Rana sauteri) in the Wu-lin area. Ph.D. Thesis, Department of Life Science, National Chung Hsing University Institutional Repository.
Pounds, J.A., Bustamante, M.R. et al. (2006) Widespread amphibian extinctions from epidemic disease driven by global warming. Nature, 439: 161-167.
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