Beech marten

The beech marten, also known as the stone marten, house marten or white breasted marten, is a species of marten native to much of Europe and Central Asia, though it has established a feral population in North America. It is listed as Least Concern on the IUCN Red List on account of its wide distribution, its large population, and its presence in a number of protected areas. It is superficially similar to the European pine marten, but differs from it by its smaller size and habitat preferences. While the pine marten is a forest specialist, the beech marten is a more generalist and adaptable species, occurring in a number of open and forest habitats.

Evolution

Its most likely ancestor is Martes vetus, which also gave rise to the pine marten. The earliest M. vetus fossils were found in deposits dated to the Würm glaciation in Lebanon and Israel. The beech marten likely originated in the Near East or southwestern Asia, and may have arrived in Europe by the Late Pleistocene or the early Holocene. Thus, the beech marten differs from most other European mustelids of the Quaternary, as all other species appeared during the Middle Pleistocene. Comparisons between fossil animals and their descendants indicate that the beech marten underwent a decrease in size beginning in the Würm period. Beech martens indigenous to the Aegean Islands represent a relic population with primitive Asiatic affinities.
The skull of the beech marten suggests a higher adaptation than the pine marten toward hypercarnivory, as indicated by its smaller head, shorter snout and its narrower post-orbital constriction and lesser emphasis on cheek teeth. Selective pressures must have acted to increase the beech marten's bite force at the expense of gape. These traits probably acted on male beech martens as a mechanism to avoid both intraspecific competition with females and interspecific competition with the ecologically overlapping pine marten.

Subspecies

, eleven subspecies are recognised.

Subspecies	Trinomial authority	Description	Range	Synonyms
European beech marten Martes f. foina	Erxleben, 1777	A small subspecies, with an average-sized skull. In winter, its back varies from light greyish tawny to completely dark brown. The guard hairs are tawny or chestnut brown, while the underfur is very light, pale-grey. The flanks and withers are slightly lighter than the back, and the belly darker. The legs are dark brown and the throat patch pure white. The patch is variable in size and shape.	European Russia, Western Europe and the Iberian Peninsula	alba domestica fagorum
Balkan beech marten Martes f. bosniaca	Brass, 1911		Balkan Peninsula
Cretan beech marten Martes f. bunites	Bate, 1906	A smaller subspecies than foina, with a less defined throat patch, which may be absent in some specimens.	Crete, Skopelos, Naxos, Erimomilos, Karpathos, Samothrake, Seriphos and Kythnos
Middle Asian beech marten Martes f. intermedia	Severtzov, 1873	A smaller subspecies than nehringi, with lighter fur. The back is moderately dark greyish-tawny. The flanks are lighter, but of the same tone as the back. The guard hairs are dark-tawny, while the underfur is almost white. The tail is dark brown. The throat patch is very variable, being sometimes completely undefined.	Montane Middle Asia, from Kopet Dag and Bolshoi Balkhas to Tarbagatai and Altai. Outside the former Soviet Union, its range includes northern Iran, Afghanistan, western Pakistan, western Himalayas, Tien Shan, Tibet and northern Mongolia	altaica leucolachnaea
Tibetan beech marten Martes f. kozlovi	Ognev, 1931		Eastern Tibet
Iberian beech marten Martes f. mediterranea	Barrett-Hamilton, 1898.	A lighter, less drab coloured form than foina.	Iberian Peninsula
Rhodes beech marten Martes f. milleri	Festa, 1914		Rhodes
Caucasian beech marten Martes f. nehringi	Satunin, 1906	A large subspecies with a massive skull. The winter coat is quite dark, brownish-tawny or dark tawny with a greyish tint. The flanks are lighter than the back, and the tail and feet are dark brown. The throat patch varies in form and size, but shows a tendency towards reduction.	Caucasus and contiguous parts of Turkey and Iran
Crimean beech marten Martes f. rosanowi	Martino and Martino, 1917	A smaller subspecies than foina, but with near identical colours.	Montane Crimea
Syrian beech marten Martes f. syriaca	Nehring, 1902	A pale coloured subspecies with a smaller skull than the nominative form	Syria
Lhasa beech marten Martes f. toufoeus	Hodgson, 1842		Lhasa, Tibet

Description

The beech marten is superficially similar to the pine marten, but has a somewhat longer tail, a more elongated and angular head and has shorter, more rounded and widely spaced ears. Its nose is also of a light peach or grey colour, whereas that of the pine marten is dark black or greyish-black. Its feet are not as densely furred as those of the pine marten, thus making them look less broad, with the paw pads remaining visible even in winter. Because of its shorter limbs, the beech marten's manner of locomotion differs from that of the pine marten; the beech marten moves by creeping in a polecat-like manner, whereas the pine marten and sable move by bounds. The load per 1 cm² of the supporting surface of the beech marten's foot is double that of the pine marten, thus it is obliged to avoid snowy regions.
Its skull is similar to that of the pine marten, but differs in its shorter facial region, more convex profile, its larger carnassials and smaller molars. The beech marten's penis is larger than the pine marten's, with the bacula of young beech martens often outsizing those of old pine martens. Males measure 430–590 mm in body length, while females measure 380–470 mm. The tail measures 250–320 mm in males and 230–275 mm in females. Males weigh 1.7–1.8 kg in winter and 2–2.1 kg in summer, while females weigh 1.1–1.3 kg in winter and 1.4–1.5 kg in summer.
The beech marten's fur is coarser than the pine marten's, with elastic guard hairs and less dense underfur. Its summer coat is short, sparse and coarse, and the tail is sparsely furred. The colour tone is lighter than the pine marten's. Unlike the pine marten, its underfur is whitish, rather than greyish. The tail is dark-brown, while the back is darker than that of the pine marten. The throat patch of the beech marten is always white. The patch is large and generally has two projections extending backwards to the base of the forelegs and upward on the legs. The dark colour of the belly juts out between the forelegs as a line into the white colour of the chest and sometimes into the neck. In the pine marten, by contrast, the white colour between the forelegs juts backwards as a protrusion into the belly colour.

Behaviour and ecology

The beech marten is mainly a crepuscular and nocturnal animal, though to a much lesser extent than the European polecat. It is especially active during moonlit nights. Being a more terrestrial animal than the pine marten, the beech marten is less arboreal in its habits, though it can be a skilled climber in heavily forested areas. It is a skilled swimmer, and may occasionally be active during daytime hours, particularly in the summer, when nights are short. It typically hunts on the ground. During heavy snowfalls, the beech marten moves through paths made by hares or skis.

Social and territorial behaviours

In an area of northeastern Spain, where the beech marten still lives in relatively unmodified habitats, one specimen was recorded to have had a home range of with two centres of activity. Its period of maximum activity occurred between 6 PM and midnight. Between 9 AM and 6 PM, the animal was found to be largely inactive. In urban areas, beech marten's dens are almost entirely in buildings, particularly during winter. The beech marten does not dig burrows, nor does it occupy those of other animals. Instead, it nests in naturally occurring fissures and clefts in rocks, spaces between stones in rock slides and inhabited or uninhabited stone structures. It may live in tree holes at a height of up to 9 metres.

Reproduction and development

and copulation occur at the same time as in the pine marten. Copulation can last longer than 1 hour. Mating occurs in the June–July period, and takes place in the morning or in moonlit nights on the ground or on the roofs of houses. The gestation period lasts as long as the pine marten's, lasting 236–237 days in the wild, and 254–275 days in fur farms. Parturition takes place in late March-early April, with the average litter consisting of 3–7 kits. The kits are born blind, and begin to see at the age of 30–36 days. The lactation period lasts 40–45 days. In early July, the young are indistinguishable from the adults.

Diet

The beech marten's diet includes a much higher quantity of plant food than that of the pine marten and sable. Plant foods eaten by the beech marten include cherries, apples, pears, plums, black nightshade, tomatoes, grapes, raspberries and mountain ash. Plant food typically predominates during the winter months. Rats, mice and chickens are also eaten. Among bird species preyed upon by the beech marten, sparrow-like birds predominate, though snowcocks and partridges may also be taken. The marten likes to plunder nests of birds including passerines, galliformes and small owls, preferring to kill the parents in addition to the fledglings. Although it rarely attacks poultry, some specimens may become specialized poultry raiders, even when wild prey is abundant. Males tend to target large, live prey more than females, who feed on small prey and carrion with greater frequency.