Mexican wolf

The Mexican wolf (Canis lupus baileyi), also known as the lobo,[lower-alpha 1] is a subspecies of gray wolf native to southeastern Arizona and southern New Mexico in the United States, and northern Mexico. It once also ranged into western Texas. It is the smallest of North America's gray wolves,[3] and is similar to the Great Plains wolf (C. l. nubilus), though it is distinguished by its smaller, narrower skull and its darker pelt, which is yellowish-gray and heavily clouded with black over the back and tail.[4] Its ancestors were likely the first gray wolves to enter North America after the extinction of the Beringian wolf, as indicated by its southern range and basal physical and genetic characteristics.[5]

Mexican wolf
Captive Mexican wolf running at Sevilleta National Wildlife Refuge, New Mexico

Critically Imperiled  (NatureServe)[1]
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Carnivora
Family: Canidae
Genus: Canis
Species:
C. lupus
Subspecies:
C. l. baileyi
Trinomial name
Canis lupus baileyi
(Nelson & Goldman, 1929)
C. l. baileyi range

Though once held in high regard in Pre-Columbian Mexico,[6] it became the most endangered gray wolf subspecies in North America, having been extirpated in the wild during the mid-1900s through a combination of hunting, trapping, poisoning and digging pups from dens. After being listed under the Endangered Species Act in 1976, the United States and Mexico collaborated to capture all lobos remaining in the wild. This extreme measure forestalled their extinction. Five wild Mexican wolves (four males and one pregnant female) were captured alive in Mexico from 1977 to 1980 and used to start a captive breeding program. Through this program, captive-bred Mexican wolves were released into recovery areas in Arizona and New Mexico beginning in 1998 in order to recolonize the animals' historical range.[7]

As of 2023, there are 241 wild Mexican wolves in the US and 45 in Mexico, and 380 in captive breeding programs, up from the 11 lobos that were released in Arizona in 1998. 2021 was the most successful year so far for the recovery program, resulting in the highest number of individuals, pups born, pups survived, and packs. Approximately 60% of the lobos were found in New Mexico and 40% in Arizona although historically both states have had similar amounts of wolves. In 2021, the U.S. population had nearly doubled over 5 years. These numbers represent a minimum since the survey only counts wolf sightings confirmed by Interagency Field Team staff.[8][9]

Taxonomy

The Mexican wolf was first described as a distinct subspecies in 1929 by Edward Nelson and Edward Goldman on account of its small size, narrow skull and dark pelt.[10] This wolf is recognized as a subspecies of Canis lupus in the taxonomic authority Mammal Species of the World (2005).[11] In 2019, a literature review of previous studies was undertaken by the National Academies of Sciences, Engineering, and Medicine. The position of the National Academies is that the historic population of Mexican wolf represents a distinct evolutionary lineage of gray wolf, and that modern Mexican wolves are their direct descendants. It is a valid taxonomic subspecies classified as Canis lupus baileyi.[12]

Lineage

Gray wolves (Canis lupus) migrated from Eurasia into North America 70,000–23,000 years ago[13][14] and gave rise to at least two morphologically and genetically distinct groups. One group is represented by the extinct Beringian wolf[13][15] and the other by the modern populations.[13] One author proposes that the Mexican wolf's ancestors were likely the first gray wolves to cross the Bering Land Bridge into North America during the Late Pleistocene after the extinction of the Beringian wolf,[15] colonizing most of the continent until pushed southwards by the newly arrived ancestors of the Great Plains wolf (C. l. nubilus).[5]

A haplotype is a group of genes found in an organism that are inherited together from one of their parents.[16][17] Mitochondrial DNA (mDNA) passes along the maternal line and can date back thousands of years.[18] A 2005 study compared the mitochondrial DNA sequences of modern wolves with those from thirty-four specimens dated between 1856 and 1915. The historic population was found to possess twice the genetic diversity of modern wolves,[19][20] which suggests that the mDNA diversity of the wolves eradicated from the western US was more than twice that of the modern population. Some haplotypes possessed by the Mexican wolf, the Great Plains wolf, and the extinct Southern Rocky Mountain wolf were found to form a unique "southern clade". All North American wolves group together with those from Eurasia, except for the southern clade which form a group exclusive to North America. The wide distribution area of the southern clade indicates that gene flow was extensive across the recognized limits of its subspecies.[20]

In 2016, a study of mitochondrial DNA sequences of both modern and ancient wolves generated a phylogenetic tree which indicated that the two most basal North American haplotypes included the Mexican wolf and the Vancouver Island wolf.[21]

In 2018, a study looked at the limb morphology of modern and fossil North American wolves. The major limb bones of the dire wolf, Beringian wolf, and most modern North American gray wolves can be clearly distinguished from one another. Late Pleistocene wolves on both sides of the Laurentide Ice Sheet — Cordilleran Ice Sheet possessed shorter legs when compared with most modern wolves. The Late Pleistocene wolves from the Natural Trap Cave, Wyoming and Rancho La Brea, southern California were similar in limb morphology to the Beringian wolves of Alaska. Modern wolves in the Midwestern US and northwestern North America possess longer legs that evolved during the Holocene, possibly driven by the loss of slower prey. However, shorter legs survived well into the Holocene after the extinction of much of the Pleistocene megafauna, including the Beringian wolf. Holocene wolves from Middle Butte Cave (dated less than 7,600 YBP) and Moonshiner Cave (dated over 3,000 YBP) in Bingham County, Idaho were similar to the Beringian wolves. The Mexican wolf and pre-1900 samples of the Great Plains wolf resembled the Late Pleistocene and Holocene fossil gray wolves due to their shorter legs.[13]

Ancestor

In 2021, a mitochondrial DNA analysis of North American wolf-like canines indicates that the extinct Late Pleistocene Beringian wolf was the ancestor of the southern wolf clade, which includes the Mexican wolf and the Great Plains wolf. The Mexican wolf is the most ancestral of the gray wolves that live in North America today.[22]

Hybridization with coyotes and other wolves
Skull

Multiple recent studies using morphological (skull measurements) and genetic datasets have concluded that Mexican wolves hybridized in clinal fashion with other wolf subspecies where both met. The Mexican Wolf Recovery plan (2017, First Revision) currently plans to manage against such occurrence in the event that Northern Rockies and Mexican wolves come into contact to protect against a genetic swamp (i.e. genes of one group become dominant and thus result in loss of genes of another group). While the purity of Mexican wolf DNA composition is important for the time being, a natural, free-ranging wolf population on a continental scale would include hybridization between different subspecies to occur freely. Mexican wolves are under considerable threat from low genetic diversity and inbreeding because all wild Mexican wolves share on average the same amount of genes as full siblings do (all present day wild wolves are descendants of an original 7, called founders).

Unlike eastern wolves and red wolves, the gray wolf species rarely interbreeds with coyotes in the wild. Direct hybridizations between coyotes and gray wolves was never explicitly observed. Nevertheless, in a study that analyzed the molecular genetics of the coyotes as well as samples of historical red wolves and Mexican wolves from Texas, a few coyote genetic markers have been found in the historical samples of some isolated individual Mexican wolves. Likewise, gray wolf Y-chromosomes have also been found in a few individual male Texan coyotes.[23] This study suggested that although the Mexican gray wolf is generally less prone to hybridizations with coyotes compared to the red wolf, there may have been exceptional genetic exchanges with the Texan coyotes among a few individual gray wolves from historical remnants before the population was completely extirpated in Texas. However, the same study also countered that theory with an alternative possibility that it may have been the red wolves, who in turn also once overlapped with both species in the central Texas region, who were involved in circuiting the gene-flows between the coyotes and gray wolves much like how the eastern wolf is suspected to have bridged gene-flows between gray wolves and coyotes in the Great Lakes region since direct hybridizations between coyotes and gray wolves is considered rare.

In tests performed on a sample from a taxidermied carcass of what was initially labelled as a chupacabra, mitochondrial DNA analysis conducted by Texas State University professor Michael Forstner showed that it was a coyote. However, subsequent analysis by a veterinary genetics laboratory team at the University of California, Davis concluded that, based on the sex chromosomes, the male animal was a coyote–wolf hybrid sired by a male Mexican wolf.[24][25] It has been suggested that the hybrid animal was afflicted with sarcoptic mange, which would explain its hairless and blueish appearance.[24]

A study in 2018 that analyzed wolf populations suspected to have had past interactions with domestic dogs found no evidence of significant dog admixture into the Mexican wolf.[26] Another study in the same year was published in the PLOS Genetics Journal which analyzed the population genomics of gray wolves and coyotes from all over North America.[27] This study detected the presences of coyote admixtures in various western gray wolf populations, all previously thought to be free of coyote-introgression, and found that the Mexican wolves carry 10% coyote admixture. The study's author also suggests that the admixture from coyotes may have also played a role in the basal phylogenetic placement of this subspecies.

Distribution

Early accounts of the distribution of the Mexican wolf included southeastern Arizona, southwestern New Mexico, and western Texas in the U.S., and the Sierra Madre Occidental in Mexico. This past distribution is supported by ecological, morphological, and physiographic data. The areas described coincide with the distribution of the Madrean pine-oak woodlands, a habitat which supports Coues’ white-tailed deer (Odocoileus virginianus couesi) that is the Mexican wolf's main prey.[28]

History
The Aztec god Xolotl, depicted here in the 15th century Codex Fejervary-Mayer, may have been based on the Mexican wolf rather than a dog as once believed.[6]

The Mexican wolf was held in high regard in Pre-Columbian Mexico, where it was considered a symbol of war and the Sun. In the city of Teotihuacan, it was common practice to crossbreed Mexican wolves with dogs to produce temperamental, but loyal, animal guardians. Wolves were also sacrificed in religious rituals, which involved quartering the animals and keeping their heads as attire for priests and warriors. The remaining body parts were deposited in underground funerary chambers with a westerly orientation, which symbolized rebirth, the Sun, the underworld and the canid god Xolotl.[6] The earliest written record of the Mexican wolf comes from Francisco Javier Clavijero's Historia de México in 1780, where it is referred to as Cuetzlachcojotl, and is described as being of the same species as the coyote, but with a more wolf-like pelt and a thicker neck.[29]

Traditional Zuni wolf fetish.

Decline

There was a rapid reduction of Mexican wolf populations in the Southwestern United States from 1915 to 1920; by the mid-1920s, livestock losses to Mexican wolves became rare in areas where the costs once ranged in the millions of dollars.[30] Vernon Bailey, writing in the early 1930s, noted that the highest Mexican wolf densities occurred in the open grazing areas of the Gila National Forest, and that wolves were completely absent in the lower Sonora. He estimated that there were 103 Mexican wolves in New Mexico in 1917, though the number had been reduced to 45 a year later. By 1927, it had apparently become extinct in New Mexico.[4] Sporadic encounters with wolves entering Texas, New Mexico and Arizona via Mexico continued through to the 1950s, until they too were driven away through traps, poison and guns. The last wild wolves to be killed in Texas were a male shot on December 5, 1970, on Cathedral Mountain Ranch and another caught in a trap on the Joe Neal Brown Ranch on December 28. Wolves were still being reported in small numbers in Arizona in the early 1970s, while accounts of the last wolf to be killed in New Mexico are difficult to evaluate, as all the purported "last wolves" could not be confirmed as genuine wolves rather than other canid species.[30]

The Mexican wolf persisted longer in Mexico, as human settlement, ranching and predator removal came later than in the Southwestern United States. Wolf numbers began to rapidly decline during the 1930s–1940s, when Mexican ranchers began adopting the same wolf-control methods as their American counterparts, relying heavily on the indiscriminate usage of 1080.[30]

Conservation and recovery
A pair of Mexican wolves with pups at Sevilleta Wolf Management Facility in Socorro, New Mexico

The Mexican wolf was listed as endangered under the U.S. Endangered Species Act in 1976, with the Mexican Wolf Recovery Team being formed three years later by the United States Fish and Wildlife Service.[31] The Recovery Team composed the Mexican Wolf Recovery Plan, which called for the reestablishment of at least 100 wolves in their historic range through a captive breeding program. Between 1977 and 1980, four males and a pregnant female were captured in Durango and Chihuahua in Mexico to act as founders of a new "certified lineage". Three lineages were brought into the United States: McBride, Ghost Ranch and Aragón.[32] Due to the limited number of founders for each lineage, these wolves can potentially carry the risks of inbreeding.[32] However, cross-lineaged wolves have less inbreeding coefficients and greater reproductive success than purebred lineages.[32] By 1999, with the addition of new lineages, the captive Mexican wolf population throughout the US and Mexico reached 178 individuals. These captive-bred animals were subsequently released into the Apache National Forest in eastern Arizona, and allowed to recolonize east-central Arizona and south-central New Mexico, areas which were collectively termed the Blue Range Wolf Recovery Area (BRWRA). The lack of livestock-free zones and tolerance for these captive wolves outside of their restoration area can be challenging for Mexican wolf conservation.[33] The Recovery Plan called for the release of additional wolves in the White Sands Wolf Recovery Area in south-central New Mexico, should the goal of 100 wild wolves in the Blue Range area not be achieved.[7]

On October 11, 2011, 5 wolves (2 males and 3 females) were released into Sonora's Madrean Sky Islands in Mexico. Since then, Mexico's National Commission of Natural Protected Areas (CONANP) has facilitated 19 wolf releases into the country.[34][35]

By late 2012, it was estimated that there were at least 75 wolves and four breeding pairs living in the recovery areas, with 27% of the population consisting of pups. Since 1998, 92 wolf deaths were recorded, with four occurring in 2012; these four were all due to illegal shootings.[36] Releases have also been conducted in Mexico, and the first birth of a wild wolf litter in Mexico was reported in 2014.[37] A study released by the U.S. Fish and Wildlife Service in February 2015 shows a minimum population of 109 wolves in 2014 in southwest New Mexico and southeast Arizona, a 31 percent increase from 2013.[38] In 2015, a court ordered the U.S. Fish and Wildlife revise the management rules.[39]

According to a survey done on the population of the Mexican wolf in Alpine, Arizona, the recovery of the species is being negatively impacted due to poaching. In an effort to fight the slowing recovery, GPS monitoring devices are being used to monitor the wolves.[40] In 2016, 14 Mexican wolves were killed, making it the highest death count of any year since they were reintroduced into the wild in 1998. Two of the deaths were caused by officials trying to collar the animals. The rest of the deaths remain under investigation.[41][42]

As of July 2017, approximately 31 wild Mexican gray wolves inhabited Chihuahua and Sonora, Mexico, in the northern Sierra Madre Occidental. As of November 2017, 114 Mexican gray wolves were living in the wild in Arizona and New Mexico, distributed in 22 packs across the two states.[43] In February 2018, five more wolves were released in Chihuahua, bringing the total wild population in Mexico (Sonora and Chihuahua) to thirty-seven wolves.[44] In 2018, six Mexican wolf pups from the Endangered Wolf Center were sent to dens in Arizona and New Mexico for their survival.[45] In 2019, the U.S. Fish and Wildlife Services discovered that 52 of 90 wolf pups born earlier in 2018 had survived to adulthood. These new wolves brought the number of Mexican gray wolves in Arizona and New Mexico to 163, with 87 wolves in New Mexico and 76 in Arizona.[46] The 2019 census also found more than 30 in Mexico.[47]

Eight Mexican wolf cubs were born at the Desert Museum in Saltillo, Coahuila on July 1, 2020.[48] In March 2021, a family of nine Mexican gray wolves (a breeding pair of wolves and their seven pups) were released into the wild of northern Mexico, bringing the total number of wolves in Mexico to around 40 wild individuals. A 2021 census also revealed that there were now approximately 186 Mexican gray wolves in the American Southwest, with about 72 wolves in Arizona and 114 in New Mexico.[49]

Captive-born wolves may be released as a well-bonded pack consisting of a breeding pair along with their pups. Captive-born pups, who are less than 14 days old, are also released by being placed with similarly aged pups to be raised as wild wolves. In 2021, 22 pups were placed into wild dens to be raised by surrogate packs under this method known as cross-fostering.[50]

In June 2021, a year-old male Mexican gray wolf named Anubis traveled out of the Mexican Wolf Recovery Area and settled in the Coconino National Forest in central Arizona.[51] He was one of several Mexican gray wolves to have dispersed into the area over several years; the male individual may be the first permanent resident of Mexican gray wolves to settle in the Coconino National Forest.[52] The U.S. Fish and Wildlife Service was ordered by the court to review the rule that caps the U.S. population at 325 wolves.[53] In 2021, a male Mexican gray wolf was stopped from crossing from New Mexico into Mexico by a section of border wall.[54] As of March 30, 2022, there were approximately 196 Mexican gray wolves living in the wild of Arizona and New Mexico.[55]

Current Population

On March 9, 2022, two new breeding pairs of Mexican gray wolves were released into the wild in the state of Chihuahua in northern Mexico, bringing the total number of wild Mexican gray wolves in the country to around 45 individuals.[56]

On February 28, 2023, the Fish and Wildlife Services discovered that the wild population of Mexican gray wolves in the American Southwest had increased to 241 wolves, with 136 wolves (40 packs) in New Mexico and 105 wolves (19 packs) in Arizona. The annual pup survival rate was 67%. 109 wolves (45% of the population) have collars for monitoring and management. 2022 had the lowest number of mortalities (12 total) since 2017. The total captive Mexican wolf population is 380 individuals, across over 60 facilities.[57]

Interagency Field Team

The wild Mexican wolf population in the United States is managed by the Interagency Field Team (IFT), whose collaborating participants include the US Fish and Wildlife Service, the US Forest Service, the White Mountain Apache Tribe, the Arizona Game and Fish Department, New Mexico Department of Game and Fish, USDA APHIS Wildlife Services, National Park Service, Species Survival Plan, and Bureau of Land Management.[9]

The IFT has a partnership with Mexico's National Commission for Natural Protected Areas and Directorate General for Wildlife to continue binational collaboration for Mexican wolf recovery.[58]

Revised Mexican Wolf Recovery Plan

In September 2022, the US Fish and Wildlife Service published the court-ordered Second Revision of the Recovery Plan. The plan provides a detailed assessment of the population, ecology, threats, management strategies, and future initiatives. It lists several criteria for downlisting (changing the classification from Endangered to Threatened) and delisting (removal of the species from the Federal Lists of Endangered and Threatened Wildlife and Plants).[59]

The criteria for delisting in the United States include: a stable or growing population over 8 years, with an average of at least 320 individuals; the implementation of State and Tribal regulations to ensure that the population remains this size or greater; and all available genetic diversity from the captive population is incorporated into the wild via reintroduction. Similar criteria are in place for Mexico, except for a lower minimum population requirement of 200 individuals.[59]

Ecology

Diet

Mexican wolves, like other wolves worldwide, primarily prey on large ungulates. Rocky Mountain elk (Cervus canadensis nelsoni) make up about 76–80% of their prey. Other native prey includes mule deer (Odocoileus hemionus), Coues white-tailed deer (Odocoileus virginianus couesi), collared peccary (Dicotyles tajacu), and small mammals such as rabbits and squirrels. Up to 16% of their diet may include domestic cattle (Bos taurus) in certain parts of their range, especially in locations where the cattle graze year-round as opposed to seasonally.[60][61][62][63]

Competition

Mexican wolves share their habitat and prey with other carnivores, including mountain lions (Puma concolor), American black bears (Ursus americanus), coyotes (Canis latrans), bobcats (Lynx rufus), red foxes (Vulpes vulpes) and gray foxes (Urocyon cinereoargenteus).[62][64] Historically, they also competed with jaguars (Panthera onca) and grizzly bears (Ursus arctos).[65]

Habitat
See also: Apache–Sitgreaves National Forests and Gila National Forest

The Mexican wolf's range is predominantly located in the Apache-Sitgreaves National Forest and the Gila National Forest, a mountainous ecosystem with many lakes, streams, and other varied terrain. In this region, the most common habitat types are Ponderosa pine forest, pinyon-juniper woodland, and Madrean encinal and pine-oak woodland. Other habitat includes mixed-conifer forest, semi-desert grassland, Great Basin and Colorado Plateau grassland-steppe, subalpine grassland, aspen forest, and spruce-fir forest.[66] Aspen research suggests that Mexican wolves have not yet altered elk behavior and populations so as to trigger a trophic cascade in the manner observed in Yellowstone National Park, likely due to the fact that the Mexican wolves still have a relatively small, highly dispersed population.[67]

This habitat contains at least 537 plant and animal species. Additional mammals include Abert's squirrels, white-nosed coatis, ringtails, bighorn sheep, and pronghorn. Birds vary from raptors like Mexican spotted owls, Apache northern goshawks, and bald eagles; to waterfowl such as American white pelicans (Pelecanus erythrorhynchos), tundra swans (Cygnus columbianus), and pied-bill grebes (Podilymbus podiceps); to songbirds like the pygmy nuthatch (Sitta pygmaea). Streams are inhabited by native fishes including Apache trout (Oncorhynchus apache), Bluehead and desert sucker (Catostomus discobolus and C. clarkii), Loach Minnow (Rhinichthys cobitis), Roundtail Chub (Gila robusta), and many more.[66][68] Local reptiles and amphibians include bullsnakes, black-tailed rattlesnakes, crevice spiny lizards, and New Mexico spadefoot toads.[69]

In 2023 the Mexican wolf was featured on a United States Postal Service Forever stamp as part of the Endangered Species set, based on a photograph from Joel Sartore's Photo Ark. The stamp was dedicated at a ceremony at the National Grasslands Visitor Center in Wall, South Dakota.[70]

Further reading
  • Bass, Rick (2007), The New Wolves: The Return of the Mexican Wolf to the American Southwest, Globe Pequot. ISBN 9781599212289 (Originally published 1998)
  • Holaday, B. (2003), Return of the Mexican Gray Wolf: Back to the Blue, University of Arizona Press, ISBN 0816522960
  • Robinson, M. (2005), Predatory Bureaucracy: The Extermination of Wolves and the Transformation of the West, University Press of Colorado, ISBN 0870818198
  • Shaw, H. (2002), The Wolf in the Southwest: The Making of an Endangered Species, High-Lonesome Books, ISBN 0944383599
  • McCarthy, Cormac (1994), The Crossing, Everyman's Library Knopf, ISBN 0375407936, A poignant fictional account of a young cowboy's capture of a wolf.
  • McBride, R. T. (1980). The Mexican wolf (Canis lupus baileyi): a historical review and observations on its status and distribution. Endangered species report, 8.

See also

Notes
  1. Spanish: Lobo mexicano; Nahuatl languages: Cuetlāchcoyōtl

References
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