Parotoids behind the eyes are prominent. Pupil of the eye is horizontal. Tympanic membrane not visible. No male resonator. No tarsal fold. 2nd and 3rd toes with paired subarticular tubercles. Dorsal skin usually with rounded tubercles, sometimes with sharp top. Dorsal surface white-grayish, gray, brown or olive-brown with more or less developed darker spots. These spots are sometimes absent, sometimes fused into irregular longitudinal bands. Background coloration changes during the breeding season, becoming uniform. Belly light-gray or yellowish-gray with dark spots. Male differs from female in having nuptial pads on 1st finger (during the breeding season on 1st, 2nd and/or 3rd fingers), smaller body size and in some body proportions. In the Carpathian Mountains, sexual differences in toad breeding coloration have been described: males have uniform, light-greenish-brownish dorsal coloration, whereas females are more brown with dark-brown spots which sometime fuse into irregular longitudinal bands most distinct on the flanks.
Distribution and Habitat
Country distribution from AmphibiaWeb's database: Albania, Austria, Belarus, Belgium, Bosnia and Herzegovina, Bulgaria, Croatia, Czech Republic, Denmark, Estonia, Finland, France, Germany, Gibraltar, Greece, Hungary, Italy, Kazakhstan, Latvia, Liechtenstein, Lithuania, Luxembourg, Macedonia, the Former Yugoslav Republic of, Moldova, Republic of, Montenegro, Netherlands, Norway, Poland, Romania, Russian Federation, Serbia, Slovakia, Slovenia, Sweden, Switzerland, Turkey, Ukraine, United Kingdom
The species is widespread in Europe. Northern margin of its range extends from Norway and Sweden (ca. 65-67oN) to
Northern Finland (Saariselka, Muanio and Kittila at 68oN to Northern Russia:
from the northern coast of the White Sea in Murmansk Province (Kandalaksha
Nature Reserve: 66o35'N, 33o13'E) and covers the whole of Karelia. Then it
runs through Arkhangelsk Province (from the environs of Arkhangelsk City:
64o36'N, 40o32'E to Pinezhskii Nature Reserve), then approximately along
the line Komi Republics - through Urals to Tyumen Province (Yamal-Nenets
Autonomous County) - Krasnoyarsk Region (middle flow of Enisei River). Then
it turns south-south-eastwards to the Chuna River in Krasnoyarsk Region and
Irkutsk Province in the East Siberia. The easternmost known locality is
Kunerma Settlement in Kazachinsko-Lensk District of Irkutsk Province
(56oN, 108o30'E). Thus, the major part of the northern margin of the
range of B. bufo in Asia approximately corresponds to the latitude 63-64oN.
Further studies of the species' distribution at its northern limit, and
especially in its eastern part, are necessary. Southern margin of the range
in Europe corresponds approximately to the southern limits of the latter. It
is absent, however, from many European islands (Balears, Corsica, Sardinia,
Malta, Crete etc.). On the continental part, the southern margin runs by
the right bank of Dnieper River in Ukraine approximately along the line
Kherson City (48o38'N, 32o37'E) - area of Zaporozhie City - Dnepropetrovsk
Province - Donetsk Province - Kharkov Province - Lugansk Province. Then
the margin runs in Russia in the southwest of Byelgorod Province - Voronezh
Province - Tambov City (52o43'N, 41o26'E) - south-east of Penza Province -
Ulyanovsk Province - north of Saratov Province. Then the margin runs to
northwestern Kazakhstan: north of Uralsk Province. The toad probably
exists on the rivers Uil and Temir southwards to 49oN. Then the margin
turns northeastwards in Russia approximately along the line Orenburg
Province - Chelyabinsk Province - Kurgan Province - south of Tyumen
Province in the West Siberia - east of Omsk Province. Then the margin
turns to the south-south-east at a level of about 55oE to the
Northeastern Kazakhstan. Then the margin runs to the south-east
and south along the valley of the Irtysh River to Semipalatinsk
Province and the East Kazakhstan Province and then, probably, to China.
According to allozyme data, Bufo bufo from the Anatolian part of Turkey is closer to B. verrucosisimus, in comparison to B. bufo or B. spinosus (from Tunisia, for example). Therefore, the Anatolian part of Turkey, as well as the Syrian Arab Republic and Lebanon, are considered to be inhabited by B. verrucosissimus and not B. bufo, despite the record provided by Hraoui-Blouqet et al. (2001) for Lebanon (Litvinchuk, pers. comm. 2008).
The Common Toad is associated mainly with the forest zone (in conifer,
mixed and deciduous forests), where it prefers conifer forests with
marshes. It lives in groves, bushlands, parks and gardens, generally
in fairly wet sites with dense vegetation. Large open areas are avoided
but in forested landscapes the toad readily inhabits bushlands, meadows,
fields, glades, gardens, vineyards etc. In the south of the range, the toad
lives in insular forests in the zone of forest steppe and in wet and dense
riparian vegetation. Spawning takes place in lakes, ponds, ditches, large
puddles and streams with relatively clear water, quite variable in area and
Life History, Abundance, Activity, and Special Behaviors
In most habitats, B. bufo is not very abundant, although sometimes up to 70 specimens are found per 100 m of pond shore or, on land, to 200 individuals per hectare.
As other toads, B. bufo is active mainly in twilight. The activity in light time, common for the toads of the Bufo viridis group, is rare in the Common Toad. The toads hibernate singly or in groups from September - beginning of November to March - June, depending on the altitude and latitude. Hibernation occurs on land and occasionally in streams and springs. Usually, the hibernation is finished in April - May. Reproduction occurs from March - June (usually late April - May). Amplexus is pectoral. A few males often clasp one female, and in many instances several males try to clasp the same female, and large "balls" consisting of numerous toads may be observed. The smallest males are forced out by larger individuals. Therefore, assortative (by body size) mating takes place. Embryonic and larval development takes usually 1.5-2.5 months.
Common Toad forages exclusively on land, mainly on crawling invertebrates. As in other species of toads, consumption of ants is very typical. This results from the sit-and-wait foraging tactics in this species. Numerous predators, parasites and morphological anomalies are known in this toad species. However, their real impact in its population dynamics remains unknown. If faced by a potential predator, the adult toad lifts its body on straight legs and butts its head toward the danger.
Trends and Threats
Destruction of forests and meadows, as well as artificial drying of wetlands compose the most serious threats for populations of B. bufo . These factors are responsible for the extinction of some populations. On a global scale, deforestation of the European south may have resulted in a retreat of the species' range northwards. Pollution of the environment by mineral fertilizers and industrial wastes, recreation, urbanization, mortality on roads, meaningless killing by people etc. result in the gradual decline of populations of B. bufo in settlements and cities. Natural factors may also influence the abundance and distribution of this species. For example, in Moscow Province in 1990s its abundance gradually increases, and the toad appears in places where it was absent in the past.
The UK has designated the species as a Biodiversity Action Plan (BAP) priority species in response to declines in some areas of central and lowland england, and on the Channel Island of Jersey (John W. Wilkinson & John Buckley, FrogLog 2012).
Relation to Humans
Main threats related to human activities were indicated above. Although a few populations of the Common Toad are able to survive even in cities, it has moderate possibilities for synanthropization: the toad is practically extinct from many large cities where many other amphibians are in relatively safe condition.
B. bufo have a tendency to breed in the same location they were born, even if other breeding areas are available nearby. This increases their susceptibility to landscape development by humans (John W. Wilkinson & John Buckley, FrogLog 2012).
Possible reasons for amphibian decline
General habitat alteration and loss
Disturbance or death from vehicular traffic
Local pesticides, fertilizers, and pollutants
Long-distance pesticides, toxins, and pollutants
Intentional mortality (over-harvesting, pet trade or collecting)
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Written by Sergius L. Kuzmin, John Cavagnaro (ipe51 AT yahoo.com), Institute of Ecology and Evolution, Russian Academy of Sciences, Moscow
First submitted 1999-09-30
Edited by Vance Vredenburg, Kellie Whittaker (2012-04-03)
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