Below are various articles and papers on native wild horses
Wild Horses as Native North American Wildlife
by Jay F. Kirkpatrick, Ph.D. and Patricia M. Fazio, Ph.D. (Revised January 2010)
© 2003‐2010, Drs. Jay F. Kirkpatrick and Patricia M. Fazio. All Rights Reserved.
Are wild horses truly “wild,” as an indigenous species in North America, or are they “feral weeds” – barnyard escapees, far removed genetically from their prehistoric ancestors? The question at hand is, therefore, whether or not modern horses, Equus caballus, should be considered native wildlife.
The question is legitimate, and the answer important. In North America, the wild horse is often labeled as a non‐native, or even an exotic species, by most federal or state agencies dealing with wildlife management, such as the National Park Service, U.S. Fish and Wildlife Service, and the Bureau of Land Management. The legal mandate for many of these agencies is to protect native wildlife and prevent non‐native species from causing harmful effects on the general ecology of the land. Thus, management is often directed at total eradication, or at least minimal numbers. If the idea that wild horses were, indeed, native wildlife, a great many current management approaches might be compromised. Thus, the rationale for examining this proposition, that the horse is a native or non-native species, is significant.
The genus Equus, which includes modern horses, zebras, and asses, is the only surviving genus in a once diverse family of horses that included 27 genera. The precise date of origin for the genus Equus is unknown, but evidence documents the dispersal of Equus from North America to Eurasia approximately 2‐3 million years ago and a possible origin at about 3.4‐3.9 million years ago. Following this original emigration, several extinctions occurred in North America, with additional migrations to Asia (presumably across the Bering Land Bridge), and return migrations back to North America, over time. The last North American extinction probably occurred between 13,000 and 11,000 years ago (Fazio 1995), although more recent extinctions for horses have been suggested. Dr. Ross MacPhee, Curator of Mammalogy at the American Museum of Natural History, and colleagues, have dated the existence of woolly mammoths and horses in North America to as recent as 7,600 years ago. Had it not been for previous westward migration, over the 2 Bering Land Bridge, into northwestern Russia (Siberia) and Asia, the horse would have faced complete extinction. However, Equus survived and spread to all continents of the globe, except Australia and Antarctica.
In 1493, on Columbus’ second voyage to the Americas, Spanish horses, representingE. caballus, were brought back to North America, first in the Virgin Islands, and, in 1519, they were reintroduced on the continent, in modern‐day Mexico, from where they radiated throughout the American Great Plains, after escape from their owners or by pilfering (Fazio 1995).
Critics of the idea that the North American wild horse is a native animal, using only selected paleontological data, assert that the species, E. caballus (or the caballoid horse), which was introduced in 1519, was a different species from that which disappeared between 13,000‐11,000 years before. Herein lies the crux of the debate. However, neither paleontological opinion nor modern molecular genetics support the contention that the modern horse in North America is non‐native.
Equus, a monophyletic taxon, is first represented in the North American fossil record about four million years ago by E. simplicidens, and this species is directly ancestral to later Blancan species about three million years ago (Azaroli and Voorhies 1990). Azzaroli (1992) believed, again on the basis of fossil records, that E. simplicidensgave rise to the late Pliocene E. Idahoensis, and that species, in turn, gave rise to the first caballoid horses two million years ago in North America. Some migrated to Asia about one million years ago, while others, such as E. niobrarensis, remained in North America.
In North America, the divergence of E. caballus into various ecomorphotypes (breeds) included E. caballus mexicanus, or the American Periglacial Horse (also known as E. caballus laurentius Hay, or midlandensis Quinn) (Hibbard 1955). Today, we would recognize these latter two horses as breeds, but in the realm of wildlife, the term used is subspecies. By ecomorphotype, we refer to differing phenotypic or physical characteristics within the same species, caused by genetic isolation in discrete habitats. In North America, isolated lower molar teeth and a mandible from sites of the Irvingtonian age appear to be E. caballus, morphologically. Through most of the Pleistocene Epoch in North America, the commonest species of Equus were not caballines but other lineages (species) resembling zebras, hemiones, and possibly asses (McGrew 1944; Quinn, 1957). 3 Initially rare in North America, caballoid horses were associated with stenoid horses (perhaps ancestral forerunners but certainly distinct species), but between one million and 500,000 years ago, the caballoid horses replaced the stenoid horses because of climatic preferences and changes in ecological niches (Forstén 1988). By the late Pleistocene, the North American taxa that can definitely be assigned to E. caballus are E. caballus alaskae (Azzaroli 1995) and E. caballus mexicanus (Winans 1989 – using the name laurentius). Both subspecies were thought to have been derived from E. niobrarensis (Azzaroli 1995).
Thus, based on a great deal of paleontological data, the origin of E. caballus is thought to be about two million years ago, and it originated in North America. However, the determination of species divergence based on phenotype is at least modestly subjective and often fails to account for the differing ecomorphotypes within a species, described above. Purely taxonomic methodologies looked at physical form for classifying animals and plants, relying on visual observations of physical characteristics. While earlier taxonomists tried to deal with the subjectivity of choosing characters they felt would adequately describe, and thus group, genera and species, these observations were lacking in precision. Nevertheless, the more subjective paleontological data strongly suggests the origin of E. caballus somewhere between one and two million years ago.
Reclassifications are now taking place, based on the power and objectivity of molecular biology. If one considers primate evolution, for example, the molecular biologists have provided us with a completely different evolutionary pathway for humans, and they have described entirely different relationships with other primates. None of this would have been possible prior to the methodologies now available through mitochondrial‐DNA analysis.
A series of genetic analyses, carried out at the San Diego Zoo’s Center for Reproduction in Endangered Species, and based on chromosome differences (Benirschke et al. 1965) and mitochondrial genes (George and Ryder 1986) both indicate significant genetic divergence among several forms of wild E. caballus as early as 200,000‐300,000 years ago. These studies do not speak to the origins of E. caballus per se, but they do point to a great deal of genetic divergence among members of E. caballus by 200,000 to 300,000 years ago. Thus, the origin had to be earlier, but, at the very least, well before the disappearance of the horse in North America between 13,000‐11,000 years ago. 4 The relatively new (30‐year‐old) field of molecular biology, using mitochondrial‐DNA analysis, has recently revealed that the modern or caballine horse, E. caballus, is genetically equivalent to E. lambei, a horse, according to fossil records, that represented the most recent Equus species in North America prior to extinction. Not only is E. caballus genetically equivalent to E. lambei, but no evidence exists for the origin of E. caballus anywhere except North America (Forstén 1992).
According to the work of researchers from Uppsala University of the Department of Evolutionary Biology (Forstén 1992), the date of origin, based on mutation rates for mitochondrial‐DNA, for E. caballus, is set at approximately 1.7 million years ago in North America. This, of course, is very close, geologically speaking, to the 1‐2 million‐year figure presented by the interpretation of the fossil record.
Carles Vilà, also of the Department of Evolutionary Biology at Uppsala University, has corroborated Forstén’s work. Vilà et al. (2001) have shown that the origin of domestic horse lineages was extremely widespread, over time and geography, and supports the existence of the caballoid horse in North American before its disappearance, corroborating the work of Benirschke et al. (1965), George and Ryder (1995), and Hibbard (1955).
A study conducted at the Ancient Biomolecules Centre of Oxford University (Weinstock et al. 2005) also corroborates the conclusions of Forstén (1992). Despite a great deal of variability in the size of the Pleistocene equids from differing locations (mostly ecomorphotypes), the DNA evidence strongly suggests that all of the large and small caballine samples belonged to the same species. The author states, “The presence of a morphologically variable caballine species widely distributed both north and south of the North American ice sheets raises the tantalizing possibility that, in spite of many taxa named on morphological grounds, most or even all North American caballines were members of the same species.”
In another study, Kruger et al. (2005), using microsatellite data, confirms the work of Forstén (1992) but gives a wider range for the emergence of the caballoid horse, of 0.86 to 2.3 million years ago. At the latest, however, that still places the caballoid horse in North America 860,000 years ago. 5 The work of Hofreiter et al. (2001), examining the genetics of the so-called E. lambei from the permafrost of Alaska, found that the variation was within that of modern horses, which translates into E. lambeiactually being E. caballus, genetically. The molecular biology evidence is incontrovertible and indisputable, but it is also supported by the interpretation of the fossil record, as well.
Finally, very recent work (Orlando et al. 2009) that examined the evolutionary history of a variety of non‐caballine equids across four continents, found evidence for taxonomic “oversplitting” from species to generic levels. This overspitting was based primarily on late‐Pleistocene fossil remains without the benefit of molecular data. A co‐author of this study, Dr. Alan Cooper, of the Australian Centre for Ancient DNA, stated, “Overall, the new genetic results suggest that we have underestimated how much a single species can vary over time and space, and mistakenly assumed more diversity among extinct species of megafauna.”
The fact that horses were domesticated before they were reintroduced matters little from a biological viewpoint. They are the same species that originated here, and whether or not they were domesticated is quite irrelevant. Domestication altered little biology, and we can see that in the phenomenon called “going wild,” where wild horses revert to ancient behavioral patterns. Feist and McCullough (1976) dubbed this “social conservation” in his paper on behavior patterns and communication in the Pryor Mountain wild horses. The reemergence of primitive behaviors, resembling those of the plains zebra, indicated to him the shallowness of domestication in horses.
The issue of feralization and the use of the word “feral” is a human construct that has little biological meaning except in transitory behavior, usually forced on the animal in some manner. Consider this parallel. E. Przewalskii (Mongolian wild horse) disappeared from Mongolia a hundred years ago. It has survived since then in zoos. That is not domestication in the classic sense, but it is captivity, with keepers providing food and veterinarians providing health care. Then they were released during the 1990s and now repopulate their native range in Mongolia. Are they a reintroduced native species or not? And what is the difference between them and E. caballus in North America, except for the time frame and degree of captivity?
The key element in describing an animal as a native species is (1) where it originated; and (2) whether or not it co‐evolved with its habitat. Clearly, E. 6 caballus did both, here in North American. There might be arguments about “breeds,” but there are no scientific grounds for arguments about “species.”
The non‐native, feral, and exotic designations given by agencies are not merely reflections of their failure to understand modern science but also a reflection of their desire to preserve old ways of thinking to keep alive the conflict between a species (wild horses), with no economic value anymore (by law), and the economic value of commercial livestock.
Native status for wild horses would place these animals, under law, within a new category for management considerations. As a form of wildlife, embedded with wildness, ancient behavioral patterns, and the morphology and biology of a sensitive prey species, they may finally be released from the “livestock‐gone‐loose” appellation.
Please cite as: Kirkpatrick, J.F., and P.M. Fazio. Revised January 2010. Wild Horses as Native North American Wildlife. The Science and Conservation Center, ZooMontana, Billings. 8 pages.
Azzaroli, A. 1990. The genus Equus in Europe. pp. 339‐356 in: European Neogene mammal chronology (E.H. Lindsay, V. Fahlbuech, and P. Mein, eds.). Plenum Press, New York.
Azzaroli, A. 1992. Ascent and decline of monodactyl equids: A case for prehistoric overkill. Annales Zoologica Fennici 28:151‐163.
Azzaroli, A. 1995. A synopsis of the Quaternary species of Equus in North America. Bollttino della Societa Paleontologica Italiana. 34:205‐221.
Azzaroli, A., and M.R. Voorhies. 1990. The genus Equus in North America: The Blancan species. Paleontologica Italiana 80:175‐198.
Benirschke K., N. Malouf, R.J. Low, and H. Heck. 1965. Chromosome compliment: Difference between Equus caballus and Equus przewalskii Polliakoff. Science 148:382‐383.
Fazio, P.M. 1995. ʺThe Fight to Save a Memory: Creation of the Pryor Mountain Wild Horse Range (1968) and Evolving Federal Wild Horse Protection through 7 1971,ʺ doctoral dissertation, Texas A&M University, College Station, p. 21.
Feist, J.D., and D.R. McCullough, Behavior Patterns and Communication in Feral Horses, Z. Tierpsychol. 41:337‐371.
Forstén, A. 1988. Middle Pleistocene replacement of stenoid horses by caballoid horses ecological implications. Paleogeography, Paleoclimatology, Paleoecology 65:23‐33.
Forstén, A. 1992. Mitochondrial‐DNA timetable and the evolution of Equus: Comparison of molecular and paleontological evidence. Ann. Zool. Fennici 28: 301‐309.
George, Jr., M., and O.A. Ryder. 1986. Mitochondrial DNA evolution in the genusEquus. Mol. Biol. Evol. 3:535‐546.
Hibbard C.W. 1955. Pleistocene vertebrates from the upper Becarra (Becarra Superior) Formation, Valley of Tequixquiac, Mexico, with notes on other Pleistocene forms. Contributions from the Museum of Paleontology, University of Michigan, 12:47‐96.
Hofreiter, M., Serre, D. Poinar, H.N. Kuch, M., Pääbo, S. 2001. Ancient DNA. Nature Reviews Genetics. 2(5), 353‐359.
Kruger et al. 2005. Phylogenetic analysis and species allocation of individual equids using microsatellite data. J. Anim. Breed. Genet. 122 (Suppl. 1):78‐86.
McGrew, P.O. 1944. An early Pleistocene (Blancan) fauna from Nebraska. Field Museum of Natural History, Geology Series, 9:33‐66.
Orlando, L. et al. 2009. Revising the recent evolutionary history of equids using ancient DNA. Proc. Nat. Acad. Sci. www.pnas.org/cai/doi/10.1073/pnas.0903672106
Quinn, J.H. 1957. Pleistocene Equidae of Texas. University of Texas, Bureau of Economic Geology, Report of Investigations 33:1‐51.
Vilà, C., J.A. Leonard, A. Götherström, S. Marklund, K. Sandberg, K. Lidén, R. K. Wayne, H. Ellegren. 2001. Widespread origins of domestic horse lineages. Science 291: 474‐477. 8 Weinstock, J.E., A. Sher Willerslev, W. Tong, S.Y.W. Ho, D. Rubnestein, J. Storer, J. Burns, L. Martin, C. Bravi, A. Prieto, D. Froese, E. Scott, L. Xulong, A. Cooper. 2005. Evolution, systematics, and the phylogeography of Pleistocene horses in the New World: a molecular perspective. PLoS Biology 3:1‐7.
Winans M.C. 1989. A quantitative study of North American fossil species of the genusEquus. pp. 262‐297, in: The Evolution of Perissodactyles (D.R. Prothero and R.M. Schoch, eds.). Oxford University Press, New York, NY.
Jay F. Kirkpatrick, Director, The Science and Conservation Center, ZooMontana, Billings, holds a Ph.D. in reproductive physiology from the College of Veterinary Medicine at Cornell University.
Patricia M. Fazio, Research Fellow, The Science and Conservation Center, ZooMontana, Billings, holds a B.S. in agriculture (animal husbandry/biology) from Cornell University, and M.S. and Ph.D. degrees in environmental history from the University of Wyoming and Texas A&M University, College Station, respectively. Her dissertation was a creation history of the Pryor Mountain Wild Horse Range, Montana/Wyoming.
Please note: This document is the sole intellectual property of Drs. Jay F. Kirkpatrick and Patricia M. Fazio. As such, altering of content, in any manner, is strictly prohibited. However, this article may be copied and distributed freely in hardcopy, electronic, or Website form, for educational purposes only.
The Horse and Burro as Positively Contributing Returned Natives in North America
By Craig Downer
Since the Wild Free-Roaming Horses and Burros Act of 1971, debate has raged over whether horses and burros are restored North American natives. Fossil, genetic and archeological evidence supports these species as native. Also, objective evaluations of their respective ecological niches and the mutual symbioses of post-gastric digesting, semi-nomadic equids support wild horses and burros as restorers of certain extensive North American ecosystems. A Reserve Design strategy is proposed to establish naturally self-stabilizing equine populations that are allowed to harmoniously adapt over generations within their bounded and complete habitats. These populations should meet rigid standards for viability based on IUCN SSC assessments (2,500 individuals). Basic requirements are described for successful Reserve Design including viable habitat as well as specific regions of North America where this could be implemented.
The Aboriginal North American Horse
IN SUPPORT OF SENATE BILL 2278 (North Dakota)
STATEMENT OF CLAIRE HENDERSON
BATIMENT DE KONINCK
QUEBEC CITY, QUEBEC CANADA
236 Rve Lavergne Quebec, Quebec, G1K-2k2 Canada
(February 1, 1991)
The Indian pony and its characteristics
Early French manuscripts: Evidence of a Dakota horse culture prior to 1650
Eurasia: A comparison
———— ——— ——— ——— ——— ——— —
PRESENTED BY Claire Henderson, Laval University, Quebec, Canada. 2-1-91.
Ancestral Mother of All Horses Galloped 160,000 Years Ago
Every horse in the world can be traced to a single mare that trotted the earth about 130,000 to 160,000 years ago, scientists discovered for the first time.
The research identified 18 different genetic clusters that arose from the ancestral mare, suggesting that domestication occurred in many places across Europe and Asia, according to work published today in the Proceedings of the National Academy of Sciences.
The study helps pinpoint the time when humans began domesticating horses, though it was known to be after dogs, sheep, pigs and cattle. The research may also help scientists classify horse fossils, figure out the pedigree of modern breeds and perhaps evaluate how genetics affect racehorse performance, said Samantha Brooks, an assistant professor of equine genetics at Cornell University, in a telephone interview.
“When you think about animals that shaped human history, the horse is No. 1,” said Brooks, who wasn’t involved in the study. “Domesticated animals define what it is to be a human. Without that, it’s unlikely we’d have the culture and technology we have today.”
Horses and chariots were used as weapons until the 20th century, when machine guns, tanks and airplanes were developed. They were used to clear forests, plow land and herd cattle. Until the 1800s, the fastest way to travel over land was on horseback.
The study, led by Alessandro Achilli, a researcher in the department of cellular and environmental biology at the Universita di Perugia inItaly, analyzed mitochondrial DNA, which contains genes that are essential for the cell’s energy functions. These genes are inherited solely from the mother.
Horses lived throughout Europe and Asia during the Paleolithic period, although many lineages probably didn’t survive the peak of the last glacial period, from 26,500 to 20,000 years ago and another later period that covered Europe in ice. There were probably horse refuges in the Ukraine, Turkestan and the Iberian Peninsula, because those places were less cold.
The 18 genetic clusters suggest that horses were domesticated multiple times, in different places. At least one horse domestication happened in Western Europe, possibly in the Iberian Peninsula, the authors wrote.
The study was conducted using 83 genomes from horses across Asia, Europe, the Middle East and the Americas.
To contact the editor responsible for this story: Reg Gale firstname.lastname@example.org.
“wild eyes never lie. look closely, your truth is found here, reflected in this wild mirror. act your truth, be your reflection, be your wild heart.” ~ andrea maki
Photo © Ellen Holcomb, all rights reserved.
Fact Checker: Mustangs – return of the native or invasive species?
By Frank Mullen
1) Wild horses didn’t become extinct in North America and remnants of the ancient herds were still present in this hemisphere when Columbus landed in the New World in 1492.
2) Mustangs on public lands are a feral, invasive species, introduced into an environment where they are not native and should not be allowed to roam.
The two claims are at opposite extremes of an ongoing debate that surrounds the federal government’s wild horse roundups in the West.
It’s generally accepted that horse species evolved on the North American continent. The fossil record for equine-like species goes back nearly 4 million years. Modern horses evolved in North America about 1.7 million years ago, according to researchers at Uppsala University, who studied equine DNA. Scientists say North American horses died out between 13,000 and 10,000 years ago, at the end of the Pleistocene Epoch, after the species had spread to Asia, Europe, and Africa.
Horses were reintroduced by the Spanish explorers in the 16th century. Animals that subsequently escaped or were let loose from human captivity are the ancestors of the wild herds that roam public lands today.
That’s the theory, but revisionists point out that some sources, including the Book of Mormon and Native American cultural tradition, say horses have been continually present on the continent long after the last Ice Age. Some folks contend the original Appaloosa horses of the Nez Perce tribe, which were distinct from other horses, were a remnant of the original equines of the Americas.
Over the years, the horse extinction theory has changed.
Many scientists once thought horses died out on the continent before the arrival of the ancestors of the American Indians, but archeologists have found equine and human bones together at sites dating back to more than 10,000 years ago. The horse bones had butchering marks, indicating the animals were eaten by people, according to “Horses and Humans: The Evolution of Human-Equine Relationships,” edited by Sandra L. Olsen.
So it appears that humans and horses coexisted in the New World prior to 1492, but did they continue to survive in North America over the last 100 centuries?
The claim that wild horses in America are as invasive as Asian clams in Lake Tahoe or rabbits in Australia also is made in the wild horse management debate. Some ranchers call mustangs “long-legged rats” and reader comments on RGJ stories about roundups always include opinions that the mustangs are feral interlopers and should be dealt with as vermin.
Federal law makes the argument academic.
In 1971, Congress declared wild horses and burros to be “living symbols of the historic and pioneer spirit of the West; (and) that they contribute to the diversity of life forms within the nation and enrich the lives of the American people.”
Lawmakers unanimously decided the free-roaming equines be “protected from capture, branding, harassment, or death, and to accomplish this they are to be considered in the area where presently found as an integral part of the natural system of public land.”
Federal officials are charged with managing the free-roaming herds to achieve an ecological balance, and disagreements about the wisdom and quality of that management is the source of current debates.
By definition, horses are North American natives because most of their evolutionary development took place on this continent. They are “native” rather than “livestock-gone-loose,” because they originated here and co-evolved with the American habitat, according to Jay F. Kirkpatrick, director of the Science and Conservation Center in Billings, Mont.
DNA research by molecular biologist Ann Forsten of Uppsala University concludes the ancient horses and the modern domestic horses are the same species. That finding contradicts critics who maintain the original North American horses and the ones that were reintroduced aren’t the same animals.
No one is certain why, at the end of the last Ice Age, equines vanished from the hemisphere. Theories of the cause of the extinction include drought, disease, or a result of hunting by humans.
The submergence of the Bering land bridge prevented any return migration from Asia. There’s no proof any horses escaped extinction in the Americas. If horses survived in the New World up to the 15th century, then no one has ever been able to find the physical evidence to prove the theory.
But, as horse advocates maintain, modern horses evolved here and that’s an adequate reason to consider them native American species, and not “invasive” or “introduced feral animals.”
The horses were “reintroduced” to the continent, unlike the Asian clams in Tahoe or the rabbits of Australia, which were inserted into regions where Nature never put them and where they could disrupt the ecological balance.
Truth Meter: 1 Given what we know about the history and evolution of horses in North America, both claims are false.