Pika

Pika Ma[1] PreꞒ Ꞓ O S D C P T J K Pg N
American pika (Ochotona princeps)
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Order:	Lagomorpha
Family:	Ochotonidae Thomas, 1897
Genus:	Ochotona Link , 1795
Type species
Link, 1795 (Lepus dauuricus Pallas , 1776)
Species
See text

A pika (/ˈpaɪkə/ PEYE-kə^[3] or /ˈpiːkə/ PEE-kə^[4]) is a small, mountain-dwelling mammal native to Asia and North America. With short limbs, a very round body, an even coat of fur, and no external tail, they resemble their close relative, the rabbit, but with short, rounded ears.^[5] The large-eared pika of the Himalayas and nearby mountains lives at elevations of more than 6,000 m (20,000 ft).

The name "pika" appears to be derived from the Tungus pika,^[6] and the scientific name Ochotona is derived from the Mongolian word ogotno, оготно, which means pika.^[7] It is used for any member of the Ochotonidae (/ɒkətoʊnɪdeɪ/),^[8] a family within the order of lagomorphs, the order which also includes the Leporidae (rabbits and hares). They are the smallest animal in the lagomorph group.^[9] Only one genus, Ochotona^[8] (/ɒkəˈtoʊnə/ or /ɒtʃəˈtoʊnə/), is extant within the family, covering 37 species, though many fossil genera are known. Another species, the Sardinian pika, belonging to the separate genus Prolagus, has become extinct within the last 2000 years owing to human activity.

Pikas prefer rocky slopes and graze on a range of plants, primarily grasses, flowers, and young stems. In the autumn they pull hay, soft twigs, and other stores of food under rocks to eat during the long, cold winter.

Pikas are native to cold climates in Asia and North America. Most species live on rocky mountainsides, where numerous crevices are available for their shelter, although some pikas also construct crude burrows. A few burrowing species are native to open steppe land. In the mountains of Eurasia, pikas often share their burrows with snowfinches, which build their nests there.^[11] Changing temperatures have forced some pika populations to restrict their ranges to even higher elevations.^[12]

Pikas are small mammals, with short limbs and rounded ears. They are about 15 to 23 cm (5.9 to 9.1 in) in body length and weigh between 120 and 350 g (4.2 and 12.3 oz), depending on species.

These animals are herbivores and feed on a wide variety of plant matter, including forbs, grasses, sedges, shrub twigs, moss and lichens. Easily digestible food is processed in the gastrointestinal tract and expelled as regular feces. But in order to get nutrients out of hard to digest fiber, pika ferment fiber in the cecum (in the GI tract) and then expel the contents as cecotropes, which are reingested (cecotrophy). The cecotropes are then absorbed in the small intestine to utilize the nutrients.

Collared pikas have been known to store dead birds in their burrows for food during winter and eat the feces of other animals.^[13]

As with other lagomorphs, pikas have gnawing

Rock-dwelling pikas have small litters of fewer than five young, whilst the burrowing species tend to give birth to more young and to breed more frequently, possibly owing to a greater availability of resources in their native habitats. The young are born altricial (eyes and ears closed, no fur) after a gestation period of between 25 and 30 days.^[11]

Pikas are active during daylight (

The impact of human activity on the tundra ecosystems where pikas live has been recorded dating back to the 1970s.^[18] Rather than hibernate during winter, pikas forage for grasses and other forms of plant matter and stash these findings in protected dens in a process called "haying". They eat the dried plants during the winter.^[19] When pikas mistake humans as predators, they may respond to humans as they do to other species that do prey on pikas. Such interactions with humans have been linked to pikas having reduced amounts of foraging time, consequentially limiting the amount of food they can stockpile for winter months.^[20] Pikas prefer foraging in temperatures below 25 °C (77 °F), so they generally spend their time in shaded regions and out of direct sunlight when temperatures are high.^[20] A link has also been found between temperature increases and lost foraging time, where for every increase of 1 °C (1.8 °F) to the ambient temperature in alpine landscapes home to pikas, those pikas lose 3% of their foraging time.^[20]

Eurasian pikas commonly live in family groups and share duties of gathering food and keeping watch. Some species are territorial. North American pikas (

Pikas have distinct calls, which vary in duration. The call can be short and quick, a little longer and more drawn out or long songs. The short calls are an example of geographic variation. The pikas determine the appropriate time to make short calls by listening for cues for sound localization.^[21] The calls are used for individual recognition, predator warning signals, territory defense, or as a way to attract potential mates.^[22] There are also different calls depending on the season. In the spring the songs become more frequent during the breeding season. In late summer the vocalizations become short calls. Through various studies, the acoustic characteristics of the vocalizations can be a useful taxonomic tool.^[23]

The average lifespan of pikas in the wild is roughly seven years. A pika's age may be determined by the number of adhesion lines on the periosteal bone on the lower jaw. The lifespan does not differ between the sexes.^[24]

The 34 species currently recognized are:

• Order Lagomorpha^[2]
  • Family Ochotonidae: pikas
    • Genus Ochotona
      • Subgenus Conothoa: mountain pikas
        • Chinese red pika, O. erythrotis
        • Forrest's pika, O. forresti
          • Gaoligong pika (O. gaoligongensis) and black pika (O. nigritia) are now thought to be conspecific with O. forresti
        • Glover's pika, O. gloveri
          • Muli pika (O. muliensis) is now thought to be conspecific with O. gloveri
        • Ili pika, O. iliensis
        • Koslov's pika, O. koslowi
        • Ladak pika, O. ladacensis
        • Large-eared pika, O. macrotis
        • Royle's pika, O. roylei
          • Himalayan pika (O. himalayana) is now thought to be conspecific with O. roylei
        • Turkestan red pika, O. rutila
      • Subgenus Alienauroa
        • Yellow pika, O. huanglongensis
        • Sacred pika, O. sacraria
        • Flat-headed pika, O. flatcalvariam
      • Subgenus Ochotona: shrub-steppe pikas
        • Gansu pika or gray pika, O. cansus
        • Plateau pika or black-lipped pika, O. curzoniae
        • Daurian pika, O. dauurica
        • Nubra pika, O. nubrica
        • Steppe pika, O. pusilla
        • Qionglai pika, O. qionglaiensis
        • Afghan pika, O. rufescens
        • Sijin pika, O. sikimaria
        • Tsing-ling pika, O. syrinx
        • Moupin pika, O. thibetana
        • Thomas's pika, O. thomasi
      • Subgenus Pika: northern pikas
        • Alpine pika or Altai pika, O. alpina
        • Helan Shan pika or silver pika, O. argentata
        • Collared pika, O. collaris
        • Korean pika, O. coreana
        • Hoffmann's pika, O. hoffmanni
        • Northern pika or Siberian pika, O. hyperborea
        • Manchurian pika, O. mantchurica
        • Kazakh pika, O. opaca
        • Pallas's pika, O. pallasii
        • American pika, O. princeps
        • Turuchan pika, O. turuchanensis

Many fossil forms of Ochotona are described in the literature, from the

• Eurasia
  • large forms
    • †
      Baode area, late Miocene)^[1][25][26]
    • †Ochotona gromovi (Asia, Pliocene, see also North America)^[26]
    • †Ochotona gudrunae (China: Shanxi, early Pleistocene)^[1][25][26]
    • †Ochotona guizhongensis (Tibet, late Miocene)^[1][26][27]
    • †Ochotona lagreli (China: Inner Mongolia, late Miocene to late Pliocene)^{[1][25][26][27]}
    • †Ochotona magna (China, early Pleistocene)^[1][26][28]
    • †Ochotona tologoica (Transbaikalia, Pliocene, see also North America)^[1][26][28]
    • †
      Transcaucasia: eastern Georgia and Azerbaijan, Transbaikal and probably southern Europe, early to late Pleistocene)^[1][25][26]
    • †Ochotona ursui (Romania, Pliocene)^[1][26]
    • †Ochotona zasuchini (Transbaikalia, Pleistocene)^[1][26][28]
    • †Ochotona zazhigini (Asia, Pliocene, see also North America)^[1][26]
    • †Ochotona zhangi (China, Pleistocene)^[1][26][28]
  • medium-sized forms
    • †Ochotona agadjianiani (Asia, Pliocene)^[26]
    • †Ochotona antiqua (Moldavia, Ukraine, and the Russian Plain, Caucasus, and probably Rhodes, late Miocene to Pliocene)^[1][25][26]
    • †Ochotona azerica (Transcaucasia: Azerbaijan,^[29] middle Pliocene)^[1][28]
    • †Ochotona lingtaica (Asia, Pliocene)^[1][26]
    • †Ochotona dodogolica (Asia: western Transbaikalia, Pleistocene)^[25][26]
    • †Ochotona nihewanica (China: Hebei, early Pleistocene)^{[1][25][26][30]}
    • †Ochotona plicodenta (Asia, Pliocene)^[1][26]
    • †Ochotona polonica (Europe: Poland, Germany, France, Pliocene)^[1][25][26]
  • small-sized forms
    • †Ochotona bazarovi (Asia, upper Pliocene)^[1][28][30]
    • †Ochotona dehmi (Germany: Schernfeld, Pleistocene)^[1][26]
    • †Ochotona filippovi (Siberia, Pleistocene)^[1][30]
    • †Ochotona gracilis (Asia, Pliocene)^[1][26]
    • †Ochotona horaceki (Slovakia: Honce, Pleistocene)^[1][26]
    • †Ochotona minor (China, late Miocene)^[1][26][27]
    • †Ochotona sibirica (Asia, Pliocene)^[1][26]
    • †Ochotona valerotae (France: Valerots site, Pleistocene)^[1][26]
    • †Ochotona youngi (Asia, Pliocene)^[26]
      and others.^[1][26]
  • other examples
    • †Ochotona agadzhaniani (Transcaucasia: Armenia, Pliocene)^[1]
    • †Ochotona alaica (Asia: Kyrgyzstan, Pleistocene)^[1]
    • †Ochotona (Proochotona) eximia (Moldova, Ukraine, Russia, Kazakhstan, Miocene to Pliocene)^[1]
    • †Ochotona (Proochotona) gigas (Ukraine, Pliocene)^[1]
    • †Ochotona gureevi (Transbaikalia, middle Pliocene)^[1][28]
    • †Ochotona hengduanshanensis (China, Pleistocene)^[1]
    • †Ochotona intermedia (Asia, Pliocene)^[1][26]
    • †Ochotona (Proochotona) kalfaense (Europe: Moldova, Miocene)^[1]
    • †Ochotona (Proochotona) kirgisica (Asia: Kyrgyzstan, Pliocene)^[1]
    • †Ochotona kormosi (Hungary, Pleistocene)^[1][25]
    • †Ochotona (Proochotona) kurdjukovi (Asia: Kyrgyzstan, Pliocene)^[1]
    • †Ochotona largerli (Georgia, Pleistocene)^[1]
    • †Ochotona lazari (Ukraine, Pleistocene)^[1]
    • †Ochotona mediterranensis (Turkey, Pliocene)^[1]
    • †Ochotona ozansoyi (Turkey, Miocene)^[1]
    • †Ochotona pseudopusilla (Ukraine and Russian Plain, Pleistocene)^[1][26]
    • †Ochotona spelaeus (Ukraine, late Pleistocene)^[1][31]
    • †Ochotona tedfordi (China: Yushe Basin, late Miocene)^[1][25]
    • †Ochotona cf. whartoni (Irkutsk Oblast and Yakutia, Pleistocene, see also North America)^[26]
    • †Ochotona zabiensis (southern Poland, early Pleistocene)^[1][25]
    • †Ochotona sp. (Greece: Maritsa, Pliocene)^[26]
    • †Ochotona sp. (Hungary: Ostramos, Pleistocene)^[26]
    • †Ochotona sp. (Siberia, Pleistocene)^[26]
    • †Ochotona sp. (Yakutia, Pleistocene)^[26]
• North America
  • †Ochotona gromovi (US: Colorado, Pliocene, see also Eurasia)^[1]
  • †Ochotona spanglei (US, late Miocene or early Pliocene)^{[1][26][30][32][33][n 1]}
  • †Ochotona tologoica (US: Colorado, Pliocene, see also Eurasia)^[1]
  • †Ochotona whartoni (giant pika, US, Canada, Pleistocene to early Holocene, see also Eurasia)^{[1][26][30][34][35][n 2]}
  • †Ochotona wheatleyi (US: Alaska, Pliocene, late Pleistocene)^[1]
  • †Ochotona zazhigini (US: Colorado, Pleistocene, see also Eurasia)^[1]
  • extinct small pikas similar to the O. pusilla group (Pleistocene)^[26][30]

Paleontologists have also described multiple forms of pika not referred to specific species (Ochotona indet.) or not certainly identified (O. cf. antiqua, O. cf. cansus, O. cf. daurica, O. cf. eximia, O. cf. gromovi, O. cf. intermedia, O. cf. koslowi, O. cf. lagrelii, O. cf. nihewanica). The statuses of Ochotona (Proochotona) kirgisica and O. spelaeus are uncertain.^[1]

The "pusilla" group of pikas is characterized by archaic (

plesiomorphic) cheek teeth and small size.^[30]

The North American species migrated from Eurasia. They invaded the New World twice:

• O. spanglei during the latest Miocene or early Pliocene, followed by a roughly three-million-year-long gap in the known North American pika record[26]
• O. whartoni (giant pika) and small pikas via the Bering Land Bridge during the earliest Pleistocene^[26]

Ochotona

endemic North American species appeared in the Pleistocene. The North American collared pika (O. collaris) and American pika (O. princeps) have been suggested to have descended from the same ancestor as the steppe pika (O. pusilla).^[26]

The range of Ochotona was larger in the past, with both extinct and extant species inhabiting Western Europe and Eastern North America, areas that are currently free of pikas. Pleistocene fossils of the extant steppe pika O. pusilla currently native to Asia have been found also in many countries of Europe from the United Kingdom to Russia and from Italy to Poland, and the Asiatic extant northern pika O. hyperborea in one location in the middle Pleistocene United States.^[1]

extant pikas black.^{[1][36][n 3]}

While Ochotona is the only currently living genus of Ochotonidae, extinct genera of ochotonids include †Albertona, †Alloptox, †Amphilagus, †Australagomys, †Austrolagomys, †Bellatona, †Bellatonoides, †Bohlinotona, †Cuyamalagus, †Desmatolagus, †Eurolagus, †Gripholagomys, †Gymnesicolagus, †Hesperolagomys, †Heterolagus, †Kenyalagomys, †Lagopsis, †Marcuinomys, †Ochotonoides, †Ochotonoma, †Oklahomalagus, †Oreolagus, †Paludotona, †Piezodus, †Plicalagus, †Pliolagomys, †Prolagus, †Proochotona (syn. Ochotona), †Pseudobellatona, †Ptychoprolagus, †Russellagus, †Sinolagomys and †Titanomys.^[1] The earliest one is Desmatolagus (middle Eocene to Miocene, 42.5–14.8 Ma^[1]), usually included in the Ochotonidae, sometimes in Leporidae or in neither ochotonid nor leporid stem-lagomorphs.^[37]

Ochotonids appeared in Asia between the late Eocene and the early Oligocene, and continued to develop along with increased distribution of C₃ grasses in previously forest dominated areas under the "climatic optimum" from the late Oligocene to middle Miocene. They thrived in Eurasia, North America, and even Africa. The peak of their diversity occurred during the period from the early Miocene to middle Miocene. Most of them became extinct during the transition from the Miocene to Pliocene, which was accompanied by an increase in diversity of the leporids. It has been proposed that this switch between ochotonids and larger leporids was caused by expansion of C₄ plants (particularly the Poaceae) related to global cooling in the late Miocene, since extant pikas reveal a strong preference for C₃ plants (Asteraceae, Rosaceae, and Fabaceae, many of them C₃). Replacement of large areas of forests by open grassland first started probably in North America and is called sometimes "nature's green revolution".^[1]

Notes

1. ^ Ochotona spanglei in the Paleobiology Database.^{[33][pdb 1][pdb 2][pdb 3]}
2. ^ Ochotona whartoni in the Paleobiology Database.^{[35][pdb 4][pdb 5][pdb 6][pdb 7][pdb 8][pdb 9][pdb 10]}
3. ^ The coordinates of additional fossils not listed in the xls file attached to Ge and all paper^[1] were taken from the Paleobiology Database.^{[36][pdb 11][pdb 12][pdb 13][pdb 14][pdb 15][pdb 16][pdb 17][pdb 18][pdb 19][pdb 20][pdb 6][pdb 7][pdb 21][pdb 22][pdb 5][pdb 23][pdb 24][pdb 25][pdb 26][pdb 27][pdb 28][pdb 29][pdb 30]}

References

1. ^
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7. ^ General pika information Archived 2017-05-10 at the Wayback Machine. twycrosszoo.org
8. ^ ^{a b} Lydekker, Richard (1911). "Pica" . In Chisholm, Hugh (ed.). Encyclopædia Britannica. Vol. 21 (11th ed.). Cambridge University Press. p. 575.
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Further reading

• Orr, Robert Thomas (1977). The Little-known Pika (illustrated ed.). New York: Macmillan.
  ISBN 9780025939608
  .

External links

Wikimedia Commons has media related to Ochotona.

Wikispecies has information related to Ochotona.

• The trek of the pika, by Michael Morris, Parks Canada, Mount Revelstoke and Glacier National Parks. (includes sound file)