Jeffersonian Mammoth Jeffersonian Mammoth Jeffersonian Mammoth
Jeffersonian Mammoth
Jeffersonian Mammoth
Jeffersonian Mammoth

Jeffersonian Mammoth

Mammuthus jeffersonii (Mammuthus jeffersonii (Osborn, 1922))

 

Order: Proboscidea

Family: Elephantidae

Dimensions: length - 4,25 - 6 m (withspiralled tusks), height - 3 -3,7 m, weight - 5500 -8500 kg

Temporal range: during the Late Pleistocene epoch of North America (130,000~18,000 years ago)

 

Jeffersonian mammoths occur throughout the eastern Great Plains and Midwest, although there are occasional records in the desert southwest and southeastern US (Saunders 1970). As with the Columbian mammoth to the west, scientists think that M. jeffersonii preferred an open, grassland habitat. Most midwestern records of this mammoth indicate a presence from the last interglacial, about 130,000 years ago, to the last glacial maximum, about 18,000 years ago. Midwestern environments during this time would have included relatively cold, arid habitats, including forest tundra, and spruce parkland.

Unlike Woolly Mammoths, there are no mummified remains of Jeffersonian mammoths, so details of their outward appearance are unknown. Their presence in Midwestern loess deposits dating to the Last Glacial Maximum suggests some degree of cold-adaptation, similar to Woolly Mammoths; so it is likely that they had a thick coat of hair. Modern elephants are not very sensitive to temperature swings and to not exhibit discomfort in temperatures below freezing, nor do they grow longer hair in those conditions.

Since the Jeffersonian mammoth has been found primarily in localities representative of cold, relatively open environments, it is likely that this species of mammoth had a diet dominated by cool-season grasses and sedges. This is supported by a limited dataset of stable carbon isotopes on M. jeffersonii bone collagen.

The researchers suggest that the M. jeffersonii may have been a hybrid between the two species (Columbian and woolly mammoths), as it is apparently morphologically intermediate.

 

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Mammuthus jeffersonii (Mammuthus jeffersonii (Osborn, 1922))

 

Order: Proboscidea

Family: Elephantidae

Dimensions: length - 4,25 - 6 m (withspiralled tusks), height - 3 -3,7 m, weight - 5500 -8500 kg

Temporal range: during the Late Pleistocene epoch of North America (130,000~18,000 years ago)

 

Jeffersonian mammoths occur throughout the eastern Great Plains and Midwest, although there are occasional records in the desert southwest and southeastern US (Saunders 1970). As with the Columbian mammoth to the west, scientists think that M. jeffersonii preferred an open, grassland habitat. Most midwestern records of this mammoth indicate a presence from the last interglacial, about 130,000 years ago, to the last glacial maximum, about 18,000 years ago. Midwestern environments during this time would have included relatively cold, arid habitats, including forest tundra, and spruce parkland.

Unlike Woolly Mammoths, there are no mummified remains of Jeffersonian mammoths, so details of their outward appearance are unknown. Their presence in Midwestern loess deposits dating to the Last Glacial Maximum suggests some degree of cold-adaptation, similar to Woolly Mammoths; so it is likely that they had a thick coat of hair. Modern elephants are not very sensitive to temperature swings and to not exhibit discomfort in temperatures below freezing, nor do they grow longer hair in those conditions.

Since the Jeffersonian mammoth has been found primarily in localities representative of cold, relatively open environments, it is likely that this species of mammoth had a diet dominated by cool-season grasses and sedges. This is supported by a limited dataset of stable carbon isotopes on M. jeffersonii bone collagen.

The researchers suggest that the M. jeffersonii may have been a hybrid between the two species (Columbian and woolly mammoths), as it is apparently morphologically intermediate.

 

Відгуки (8):
Митрич
28.02.2020
Ром, вопрос на досуг: " Вот этот джефферсонов мамонт по сути - плодовитый гибрид колумбийца и "волосатика", то есть получается не является самостоятельным биологическим видом что ли? А как же он воспроизводился? Для размножения достаточно было разнополых особей одного вида этих "джефферсонов" или обязательно было спаривание именно разнополых особей колумбийцев с "волосатиками"?.. А есть ли в природе еще подобные "гибридные" плодовитые виды среди позвоночных?.. Я в этом не очень шарю, но очень интересна такая тема!
rom
26.02.2020
Пропорции абсолютно те же))) Видно шерсть визуально меняет внешность)))
Митрич
25.02.2020
А вот туточки я не со всем согласен... По порядку... Композиция (зверь и фон)хороша, но... есть с чем сравнить (летний вариант). На летнем варианте попорции тела, как мне видится, более гармоничные, правильные. На зимней же, по-моему, якая-то ересь большеголовая - башку бы ему трохи уменьшить или хоботок удлинить, было бы в пору.
rom
18.12.2019
Алексей, там сам черт ногу сломит))) Вероятнее всего, было два вида и один гибрид. Императорский скорее всего колумбиец-переросток.

Алексей
18.12.2019
Так всё-таки, есть какая то внятная систематика североамериканских мамонтов? Одни пишут, что было три вида мамонтов: императорский, колумбов и Джефферсона, а другие утверждают, что был только один - колумбов