Mastodon

A mastodon ( 'breast' + 'tooth') is any proboscidean belonging to the extinct genus ''Mammut'' (family Mammutidae). Mastodons inhabited North and Central America during the late Miocene or late Pliocene 10,000 to 11,000 years ago. They lived in herds and were predominantly forest-dwelling animals. They generally had a browsing diet, distinct from that of the contemporary Columbian mammoth, which tended towards grazing.

''M. americanum'', the American mastodon, and ''M. pacificus'', the Pacific mastodon, are the youngest and best-known species of the genus. Mastodons disappeared from North America as part of a mass extinction of most of the Pleistocene megafauna, widely believed to have been caused by a combination of climate changes at the end of the Pleistocene and overexploitation by Paleo-Indians.

History

A Dutch tenant farmer found the first recorded remnant of ''Mammut'', a tooth some in weight, in the village of Claverack, New York, in 1705. The mystery animal became known as the "incognitum". In 1739 French soldiers at present-day Big Bone Lick State Park, Kentucky, found the first bones to be collected and studied scientifically. They carried them to the Mississippi River, from where they were transported to the National Museum of Natural History in Paris. Similar teeth were found in South Carolina, and some of the African slaves there supposedly recognized them as being similar to the teeth of African elephants. There soon followed discoveries of complete bones and tusks in Ohio. People started referring to the "incognitum" as a "mammoth", like the ones that were being dug out in Siberia – in 1796 the French anatomist Georges Cuvier proposed the radical idea that mammoths were not simply elephant bones that had been somehow transported north, but a species which no longer existed. Johann Friedrich Blumenbach assigned the scientific name ''Mammut'' to the American "incognitum" remains in 1799, under the assumption that they belonged to mammoths. Other anatomists noted that the teeth of mammoths and elephants differed from those of the "incognitum", which possessed rows of large conical cusps, indicating that they were dealing with a distinct species. In 1817 Cuvier named the "incognitum" ''Mastodon''.

Cuvier assigned the name ''mastodon'' (or ''mastodont'') – meaning "breast tooth" (Ancient Greek: μαστός "breast" and ὀδούς, "tooth"), – for the nipple-like projections on the crowns of the molars.

Taxonomy

''Mastodon'' as a genus name is obsolete; the valid name is ''Mammut'', as that name preceded Cuvier's description, making ''Mastodon'' a junior synonym. The change was met with resistance, and authors sometimes applied ''"Mastodon"'' as an informal name; consequently it became the common term for members of the genus. "Mastodon" is also used informally to describe other non-elephant proboscideans, such as gomphotheres.

Species include:

* ''M. americanum'', the American mastodon, is one of the best known and among the last species of ''Mammut''. Its earliest occurrences date from the early-middle Pliocene (early Blancan stage). It was formerly regarded (see below) as having a continent-wide distribution, especially during the Pleistocene epoch, known from fossil sites ranging from present-day Alaska, Ontario and New England in the north, to Florida, southern California, and as far south as Honduras. Environmental DNA also suggests they ranged as far northeast as Greenland during the warmer conditions of the early Pleistocene. The American mastodon has been widely thought to have resembled a woolly mammoth in appearance. However, consideration of the long tail (usually present in animals living in warm climates), size, body mass and environment implies the animal was not similarly hairy, and there is scant preserved evidence of body hair (what little has been recovered suggests a semiaquatic lifestyle). It had tusks that sometimes exceeded in length; they curved upwards, but less dramatically than those of the woolly mammoth. Its main habitat was cold spruce woodlands, and it is believed to have browsed in herds. It became extinct at the end of the Pleistocene approximately 11,000 years ago.
* ''M. matthewi'' — found in the Snake Creek Formation of Nebraska, dating to the late Hemphillian. Some authors consider it practically indistinguishable from ''M. americanum''. There is one report of it in China.
* ''M. pacificus'' — based on a 2019 analysis, Pleistocene specimens from California and southern Idaho have been transferred from ''M. americanum'' to this new species. It differs from the eastern population in having narrower molars, six as opposed to five sacral vertebrae, a thicker femur, and a consistent absence of mandibular tusks.
* ''M. raki'' — Its remains were found in the Palomas Formation, near Truth or Consequences, New Mexico, dating from the early-middle Pliocene, between 4.5 and 3.6 Ma. It coexisted with ''Equus simplicidens'' and ''Gigantocamelus'' and differs from ''M. americanum'' in having a relatively longer and narrower third molar, similar to the description of the defunct genus ''Pliomastodon'', which supports its arrangement as an early species of ''Mammut''. However, like ''M. matthewi'', some authors do not consider it sufficiently distinct from ''M. americanum'' to warrant its own species.
* ''M. cosoensis'' — found in the Coso Formation of California, dating to the Late Pliocene, originally a species of ''Pliomastodon'', it was later assigned to ''Mammut''.

Since a tentative 1977 report of ''M. matthewi'' in China, there have been no reports of currently recognized ''Mammut'' species outside of North America according to Paleobiology database (which does not recognize '' M. borsoni''). However, the status of ''Mammut'' or ''Zygolophodon borsoni'' in the literature appears equivocal.

Evolution

''Mammut'' is a genus of the extinct family Mammutidae, closely related to the proboscidean family Elephantidae (mammoths and elephants), from which it originally diverged approximately twenty-seven million years ago. The following cladogram shows the placement of the American mastodon among other proboscideans, based on hyoid characteristics:

Over the years, several fossils from localities in North America, Africa and Asia have been attributed to ''Mammut'', but only the North American remains have been named and described, one of them being ''M. furlongi'', named from remains found in the Juntura Formation of Oregon, dating from the late Miocene. However, it is no longer considered valid, leaving only five valid species.

A complete mitochondrial DNA (mtDNA) sequence has been obtained from the tooth of an ''M. americanum'' skeleton found in permafrost in northern Alaska. The remains are thought to be 50,000 to 130,000 years old. This sequence has been used as an outgroup to refine divergence dates in the evolution of the Elephantidae. The rate of mtDNA sequence change in proboscideans was found to be significantly lower than in primates.

A 2020 analysis of mtDNA from American mastodon remains collected in eastern Beringia indicated they belonged to two genetically divergent clades. The clades were dated to different interglacials, suggesting a repeating pattern of colonization during an interglacial followed by extirpation during the subsequent glacial advance. The Beringian clades had less genetic diversity than populations present south of the ice sheets, suggesting they were founded by relatively small migrating populations.

Description

Modern reconstructions based on partial and skeletal remains reveal that mastodons were very similar in appearance to elephants and, to a lesser degree, mammoths, though not closely related to either one. Compared to mammoths and extant elephants, mastodons had a longer and wider body but were not as tall due to their shorter legs. Their limbs were more heavily muscled and had considerably thicker limb bones, making mastodons much more robust in comparison. As in modern elephants, the females were smaller than the males. The average shoulder height for male ''M. americanum'' was about with an average body mass of ; large males were up to in height and in weight.

They had a low and long skull with long curved tusks, with those of the males being more massive and more strongly curved. Mastodons had cusp-shaped teeth, very different from mammoth and elephant teeth (which have a series of enamel plates), well-suited for chewing leaves and branches of trees and shrubs.

Mastodons are typically depicted with a thick woolly mammoth-like coat of hair, but there is no preserved evidence for this.

Paleobiology

Social behavior

Based on the characteristics of mastodon bone sites and strontium and oxygen isotopes from tusks, it can be inferred that, as in modern proboscideans, the mastodon social group consisted of adult females and young, living in bonded groups called mixed herds. The males abandoned the mixed herds once reaching sexual maturity and lived either alone or in male bond groupings. As in modern elephants, there probably was no seasonal synchrony of mating activity, with both males and females seeking out each other for mating when sexually active.

Diet

Mastodons have been characterized as predominantly browsing animals. Of New World proboscids, they appear to have been the most consistent in browsing rather than grazing, consuming C₃ as opposed to C₄ plants, and in occupying closed forests versus more open habitats. This dietary inflexibility may have prevented them from invading South America during the Great American Interchange, due to the need to cross areas of grassland to do so. Most accounts of gut contents have identified coniferous twigs as the dominant element in their diet. Other accounts (e.g., the Burning Tree mastodon) have reported no coniferous content and suggest selective feeding on low, herbaceous vegetation, implying a mixed browsing and grazing diet, with evidence provided by studies of isotopic bone chemistry indicating a seasonal preference for browsing. Study of mastodon teeth microwear patterns indicates that mastodons could adjust their diet according to the ecosystem, with regionally specific feeding patterns corresponding to boreal forest versus cypress swamps, while a population at a given location was sometimes able to maintain its dietary niche through changes in climate and browse species availability.

Distribution and habitat

The range of most species of ''Mammut'' is unknown as their occurrences are restricted to few localities, the exception being the American mastodon (''M. americanum''), which is one of the most widely distributed Pleistocene proboscideans in North America. ''M. americanum'' fossil sites range in time from the Blancan to Rancholabrean faunal stages and in locations from as far north as Alaska, as far east as Florida, and as far south as the state of Puebla in central Mexico, with an isolated record from Honduras, probably reflecting the results of the maximum expansion achieved by the American mastodon during the Late Pleistocene. A few isolated reports tell of mastodons being found along the east coast up to the New England region, with high concentrations in the Mid-Atlantic region. There is strong evidence indicating that the members of ''Mammut'' were forest dwelling proboscideans, predominating in woodlands and forests, and browsed on trees and shrubs. They apparently did not disperse southward to South America, it being speculated that this was because of a dietary specialization on a particular type of vegetation.

A 2022 study of ancient ( Early Pleistocene, 2 million years ago) environmental DNA from the Kap Kobenhavn Formation of northern Greenland identified preserved DNA fragments of mastodons, assigned to ''M. americanum''. This suggests that mastodons ranged as far north as Greenland during optimal conditions. Around this time, northern Greenland was 11–19 °C warmer than the Holocene, with a boreal forest hosting a species assemblage with no modern analogue. These are among the oldest DNA fragments ever sequenced.

Extinction

Fossil evidence indicates that mastodons probably disappeared from North America about 10,500 years ago as part of a mass extinction of most of the Pleistocene megafauna that is widely believed to have been a result of human hunting pressure. The latest Paleo-Indians entered the Americas and expanded to relatively large numbers 13,000 years ago, and their hunting may have caused a gradual attrition of the mastodon population. Analysis of tusks of mastodons from the American Great Lakes region over a span of several thousand years prior to their extinction in the area shows a trend of declining age at maturation; this is contrary to what one would expect if they were experiencing stresses from an unfavorable environment, but is consistent with a reduction in intraspecific competition that would result from a population being reduced by human hunting.

On the other hand, environmental DNA sequencing indicates that disappearance of megafaunal DNA in North America correlates in time with major changes in plant DNA, suggesting a key role of climate change. Modeling based on the whole of the proboscid fossil record also suggests climate was the more important factor, though with human hunting imposing a "double jeopardy" on mastodons and their kin.

See also

* Coats–Hines site
* List of museums and colleges with mastodon fossils on display
* Manis Mastodon site
*Snowmastodon site

Notes

References

External links

The Rochester Museum of Science – Expedition Earth Glaciers & Giants





American Museum of Natural History – Warren Mastodon

BBC Science and Nature:Animals – American mastodon Mammut americanum

BBC News – Greek mastodon find 'spectacular'


* ttp://www.slfp.com/Mastodon.htm Saint Louis Front Page – Mastodon State Historic Site
Story of the Randolph Mastodon (Earlham College)



* ttp://westerncentermuseum.org Western Center for Archaeology & Paleontology, home of the largest mastodon ever found in the Western United States
Smithsonian Magazine Features Mammoths and Mastodons

360 View of a Mastodon Skull from Indiana State Museum
* 3-D Viewers o

an

mastodon skeletons at the University of Michiga
Mammutidae digital fossil repository
*''Scientific American'',
The Chicago Mastodon
, 18 September 1880, p. 175

{{Authority control

Messinian first appearances
Miocene proboscideans
Pleistocene extinctions
Pleistocene proboscideans
Pliocene proboscideans
Miocene mammals of North America
Pliocene mammals of North America
Pleistocene mammals of North America
Symbols of Michigan
Extinct animals of Canada
Paleontology in Michigan
Taxa named by Johann Friedrich Blumenbach
Ringold Formation Miocene Fauna