Parotoids behind the eyes are prominent. Pupil of the eye is horizontal. Tympanic membrane and male guttural resonator. Subarticular tubercles on the inner surface of toes paired. Internal edge of the tarsus with longitudinal skin fold. Tip of the 4th finger does not reach the 1st articulation of 3rd finger. Dorsal skin tuberculate, grayish-olive in color with more or less dark spots and light narrow middorsal line. Belly light. Sexual dimorphism similar to that in the Green Toad (Bufo viridis).
Distribution and Habitat
Country distribution from AmphibiaWeb's database: Austria, Belarus, Belgium, Czech Republic, Denmark, Estonia, France, Germany, Ireland, Latvia, Lithuania, Luxembourg, Netherlands, Poland, Portugal, Russian Federation, Spain, Sweden, Switzerland, Ukraine, United Kingdom
The species lives in the Southwestern and Central Europe: Portugal, Spain, France, Southwestern Ireland, Great Britain, Belgium, The Netherlands, Luxembourg, Germany, Switzerland, Austria near the Czech border, Czech Republic, Slovakia, Poland, Western Ukraine, Byelorussia, Lithuania, Latvia, Estonia (northwards to Tallin City), Western Russia (Kaliningrad Province), Denmark and Sweden.
Bufo calamita inhabits mainly open, well-warmed landscapes with light, sandy soils. There it lives in sand dunes, glades of pine forests, gardens, parks, fields, sand and gravel quarries and meadows. In the daytime it hides in heaps of stones, in sandy soil and under debris. Reproduction takes place in shallow, well-warmed ponds, puddles and ditches, including those with admixture of salt water on the shore of the Baltic Sea.
Life History, Abundance, Activity, and Special Behaviors
Populations are not usually very large. However, in some places the density reaches 200 individuals per hectare. The populations sometimes reach high densities in agricultural landscapes. For example, in the fields of central Byelorussia 7 specimens per 10 m2 have been censused.
Hibernation occurs from September - October to March - May in the same sites where it hides in summer. Otherwise, the toad buries itself in the soil. Reproduction occurs in different months, in dependence on the latitude. Breeding choruses reach maximum intensity in the evening. The mating call differs from that in the Green Toad (B. viridis). Amplexus is pectoral. The clutch contains 2800-4000 eggs deposited in two strings of 1-2 m length. Metamorphosis occurs usually in summer, but cases of larval overwintering are known. The mass appearance of newly metamorphosed toadlets is typical. Adult age may attain 17 years. The diet consists mainly of crawling invertebrates (ants, beetles etc.); mirmecophagy is typical, like in other congeneric species.
Trends and Threats
Many populations of this species are decline because of anthropogenic pressure, primarily alteration of its specialized habitats: afforestation of heathlands and their reclamation for agriculture, acidification of breeding ponds due to polluted rains, use of coastal dunes for holiday industry. There have been some translocation projects for Bufo calamita in the UK. The translocation projects show signs of sucess. This was a result of coupling the reintroduction effort with large scale habitat restoration and maintenance effort.
Relation to Humans
Negative effects of habitat alteration by humans on the toad populations were indicated above. However, in some places (e.g., in Byelorussia) its number increases in some agricultural lands where the toads can be seen breeding in catchment ponds. The toad does not avoid anthropogenic landscapes, but usually its abundance there is not high.
The toad belongs to the group of green toads (Bufo viridis complex).
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Written by Sergius L. Kuzmin (ipe51 AT yahoo.com), Institute of Ecology and Evolution, Russian Academy of Sciences, Moscow
First submitted 1999-09-30
Edited by Vance Vredenburg & JG, Peera Chanta (2006-04-05)
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