Dogxim

Last updated
Dogxim
Dogxim (cropped).png
Graxorra (Portuguese)
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Carnivora
Family: Canidae
Subfamily: Caninae
Tribe: Canini
Hybrid: Lycalopex gymnocercus × Canis familiaris

Dogxim, or Graxorra in Portuguese, was a female canid hybrid between a Pampas fox and a domesticated dog that was discovered in Brazil during 2021. [1] The canid showed a mixture of fox and dog behaviours, [2] and a team of geneticists led by Thales Renato Ochotorena de Freitas and Rafael Kretschmer announced in 2023 that she was a distinct hybrid genetically that "represents the first documented case of hybridization between these two [fox and dog] species". [3]

Contents

She was popularized as the first "fox"-dog hybrid documented in the world, [4] [5] although the Pampas fox and other South American foxes are not true foxes, [6] being instead closer genetically to wolf-like canids, which include dogs. [7] [8]

Dogxim was kept at the animal care centre Mantenedouro São Braz. However, when the scientists requested fresh photographs of the canid in September 2023, the caretakers reported that she had died six months prior to the request. The Brazilian government then issued an investigation into the cause of death. [4] [9]

Discovery

Dogxim was run over by an automobile in Vacaria, Rio Grande do Sul in 2021. She was found by the Environmental Patrol who took her to the veterinary hospital of the Federal University of Rio Grande do Sul. [1] [10] After medical treatment for her injuries, she was moved to the university's Center for Conservation and Rehabilitation of Wild Animals for full recovery. [11] Scientists recollected that in 2019 biologist Herbert Hasse Junior had observed two strange canids in the same region and they speculated that Dogxim might be one of the two. [12]

The size of Dogxim was approximately that of a medium-sized dog. Her eyes were dark brown and her body was dark brown with specks of white and grey, [13] and had wiry hairs. [14] By November 2021, she was transferred to Mantenedouro São Braz, an animal care centre in Santa Maria. [4] [15] The caretakers there noticed unusual characteristics and features in the canid that are a mixture those of wild canids and dogs. The ultimate give away came after full recovery when she showed preference for climbing in bushes to ground roaming. The veterinarian and conservationist, Flávia Ferrari, realised the need for biological assessment [11] for which geneticists Thales Renato Ochotorena de Freitas, of the Federal University of Rio Grande do Sul, and Rafael Kretschmer, of the Federal University of Pelotas, were consulted. The genetic study established the canid as a hybrid individual, [2] which was reported in the journal Animals on 3 August 2023. [3]

Name

The name Dogxim is derived from dog and graxaim-do-campo, a Portuguese name for the Pampas fox. She also was given a Portuguese name, graxorra, combining the prefix for the Pampas fox and the suffix taken from cachorra that means female dog. [14]

Behaviour

Dogxim possessed a mixture of wild canid features and dog features. She had noticeably large pointed ears resembling that of foxes. She refused to eat dog food, but savoured rats. [14] The pupils of her eyes resembled those of dogs and she barked exactly like dogs do. [11] She did not show the behavior of a domestic dog, but neither did she show the aggression generally displayed by wild canids, acting more shy and introverted than violent. [1] She easily adapted to human environment during her hospitalisation. [15] Although she was sterilized during her medical care, scientists believed that she had been capable of reproduction. [14]

Identification

Giemsa-stained (A) and C-banded (B) metaphase in Dogxim showing 76 chromosomes, arrows indicate the X chromosomes Dogxim-chromosomes.png
Giemsa-stained (A) and C-banded (B) metaphase in Dogxim showing 76 chromosomes, arrows indicate the X chromosomes

Four species of wild canids are known in southern Brazil, the bush dog (Speothos venaticus), the maned wolf (Chrysocyon brachyurus), the crab-eating fox (Cerdocyon thous), and the Pampas fox (Lycalopex gymnocercus). It was thought that Dogxim could not have come from the bush dog as that species is not present in the Vacaria region where she was found. The largest canid in southern Brazil is the maned wolf, but Dogxim had no particular resemblance to that species. Dogxim did have common features with both the crab-eating fox and the Pampas fox, but precise identification would require genetic analysis. [15]

Genetics

Genitic analysis indicated that Dogxim had 76 chromosomes, which exactly matches the number in the maned wolf. [11] However, as the chromosomes lacked the common structural appearances (phenotype) of that species, it appeared likely that the two canids were not related. [15] It was found that Dogxim's 76 chromosomes came from the haploid chromosomes, 39 from the dog and 37 from the Pampas fox, [3] [11] the first evidence of hybridisation between these two different canid species. [5] Dogs have 78 chromosomes (39 haploid pairs), while the Pampas fox, 74 (37 haploid pairs). [2] [16] Additional evidence of hybridisation was the presence of two different X chromosomes indicating their origins from two species. [12] [10]

In mammals such as dogs and humans, mitochondria are inherited exclusively from the mothers. [17] Mitochondrial DNA (mtDNA) of Dogxim indicated that her mitochondria came from the Pampas fox. [3] Thus, Dogxim came from a crossbreeding between a Pampas fox mother and a dog father of an unknown breed. [2]

Death

In August 2023, Scientists asked the caretakers at Mantenedouro São Braz for fresh pictures of Dogxim. [13] The caretakers replied that she had died six months prior to the request. [9] The time and nature of her death were never reported. Veternarian and conservationist Ferrari recalled that the canid had "no indications of any health problems" after her recovery. [13] Six months after the injury she had been noted as completely healed. [2] The Brazilian government issued concerns on the cause of death. [9] The Secretariat of Environment and Infrastructure (SEMA) is conducting the investigation. [12]

Related Research Articles

<span class="mw-page-title-main">Canidae</span> Family of mammals

Canidae is a biological family of dog-like carnivorans, colloquially referred to as dogs, and constitutes a clade. A member of this family is also called a canid. The family includes three subfamilies: the Caninae, the extinct Borophaginae and Hesperocyoninae. The Caninae are known as canines, and include domestic dogs, wolves, coyotes, foxes, jackals and other species.

<span class="mw-page-title-main">Jackal</span> Several species of the wolf genus of mammals

Jackals are canids native to Africa and Eurasia. While the word "jackal" has historically been used for many canines of the subtribe canina, in modern use it most commonly refers to three species: the closely related black-backed jackal and side-striped jackal of sub-Saharan Africa, and the golden jackal of south-central Europe and Asia. The African golden wolf was also formerly considered as a jackal.

<span class="mw-page-title-main">Dingo</span> Canid species native to Australia

The dingo is an ancient (basal) lineage of dog found in Australia. Its taxonomic classification is debated as indicated by the variety of scientific names presently applied in different publications. It is variously considered a form of domestic dog not warranting recognition as a subspecies, a subspecies of dog or wolf, or a full species in its own right.

<span class="mw-page-title-main">Common raccoon dog</span> Canid indigenous to East Asia

The common raccoon dog, also called the Chinese or Asian raccoon dog to distinguish it from the Japanese raccoon dog, is a small, heavy-set, fox-like canid native to East Asia. Named for its raccoon-like face markings, it is most closely related to foxes. Common raccoon dogs feed on many animals and plant matter, and are unusual among canids in that they hibernate during cold winters and can climb trees. They are widespread in their native range, and are invasive in Europe where they were introduced for the fur trade. The similar Japanese raccoon dog, native to Japan, is the only other living member of the genus Nyctereutes. Other names for the common raccoon dog include mangut, and neoguri.

<span class="mw-page-title-main">Maned wolf</span> Species of carnivore

The maned wolf is a large canine of South America. It is found in Argentina, Brazil, Bolivia, Peru, and Paraguay, and is almost extinct in Uruguay. Its markings resemble those of foxes, but it is neither a fox nor a wolf. It is the only species in the genus Chrysocyon.

<span class="mw-page-title-main">Wolfdog</span> Dog-wolf hybrid

A wolfdog is a canine produced by the mating of a domestic dog with a gray wolf, eastern wolf, red wolf, or Ethiopian wolf to produce a hybrid.

<span class="mw-page-title-main">Bush dog</span> Species of carnivore

The bush dog is a canine found in Central and South America. In spite of its extensive range, it is very rare in most areas except in Suriname, Guyana and Peru; it was first described by Peter Wilhelm Lund from fossils in Brazilian caves and was believed to be extinct.

<span class="mw-page-title-main">Golden jackal</span> Species of mammal

The golden jackal, also called common jackal, is a wolf-like canid that is native to Eurasia. The golden jackal's coat varies in color from a pale creamy yellow in summer to a dark tawny beige in winter. It is smaller and has shorter legs, a shorter tail, a more elongated torso, a less-prominent forehead, and a narrower and more pointed muzzle than the Arabian wolf. It is listed as Least Concern on the IUCN Red List due to its widespread distribution and high density in areas with plenty of available food and optimum shelter.

<span class="mw-page-title-main">Coydog</span> Coyote and dog hybrid

A coydog is a canid hybrid resulting from a mating between a male coyote and a female dog. Hybrids of both sexes are fertile and can be successfully bred through four generations. Similarly, a dogote is a hybrid with a dog father and a coyote mother.

<span class="mw-page-title-main">Coywolf</span> Hybrid mammal

A coywolf is a canid hybrid descended from coyotes, eastern wolves, gray wolves, and dogs. All of these species are members of the genus Canis with 78 chromosomes, they therefore can interbreed. One genetic study indicates that these species genetically diverged relatively recently. Genomic studies indicate that nearly all North American gray wolf populations possess some degree of admixture with coyotes following a geographic cline, with the lowest levels occurring in Alaska, and the highest in Ontario and Quebec, as well as Atlantic Canada. Another term for these hybrids is sometimes wolfote.

<span class="mw-page-title-main">Crab-eating fox</span> Species of carnivore

The crab-eating fox, also known as the forest fox, wood fox, bushdog or maikong, is an extant species of medium-sized canid endemic to the central part of South America since at least the Pleistocene epoch. Like South American foxes, which are in the genus Lycalopex, it is not closely related to true foxes. Cerdocyon comes from the Greek words kerdo and kyon (dog) referring to the dog- and fox-like characteristics of this animal.

<span class="mw-page-title-main">Short-eared dog</span> Species of carnivore

The short-eared dog, also known as the short-eared zorro or small-eared dog, is a unique and elusive canid species endemic to the Amazonian basin. This is the only species assigned to the genus Atelocynus.

<span class="mw-page-title-main">Pampas fox</span> Species of carnivore

The Pampas fox, also known as grey pampean fox, Pampas zorro, Azara's fox, or Azara's zorro, is a medium-sized zorro, or "false" fox, native to the South American Pampas. Azara in some of its alternative common names is a reference to Spanish naturalist Félix de Azara.

Canid hybrids are the result of interbreeding between the species of the subfamily Caninae.

<span class="mw-page-title-main">Caninae</span> Subfamily of carnivores

The Caninae, known as canines, are one of three subfamilies found within the canid family. The other two canid subfamilies are the extinct Borophaginae and Hesperocyoninae. The Caninae includes all living canids and their most recent fossil relatives. Their fossils were first found in North America and dated to the Oligocene era, then spreading to Asia at the end of the Miocene era, some 7 million to 8 million years ago.

<span class="mw-page-title-main">Japanese raccoon dog</span> Species of mammal

The Japanese raccoon dog, also known by its Japanese name tanuki, is a species of canid endemic to Japan. It is one of two species in the genus Nyctereutes, alongside the common raccoon dog (N. procyonoides), of which it was traditionally thought to be a subspecies.

<span class="mw-page-title-main">Dingo–dog hybrid</span> An Australian hybrid animal

A dingo–dog hybrid is a hybrid cross between a dingo and a domestic dog. The current population of free ranging domestic dogs in Australia is probably higher than in the past. However, the proportion of the so-called "pure" dingoes has been on the decrease over the last few decades due to hybridisation and is regarded as further decreasing.

<span class="mw-page-title-main">Jackal–dog hybrid</span> Canid hybrid resulting from a mating between a dog and a golden jackal

A jackal–dog hybrid is a canid hybrid resulting from a mating between a domestic dog and a golden jackal. Such crossbreeding has occurred numerous times in captivity and was first confirmed to occasionally happen in the wild in Croatia in 2015.

<span class="mw-page-title-main">Fuegian dog</span> Extinct domesticated canid

The Fuegian dog, or Yahgan dog, or Patagonian dog, is an extinct type of canid. In comparison to the domestic dog's ancient wolf ancestry, the Fuegian dog was traditionally thought to be bred and domesticated from the South American culpeo, also known as the culpeo fox. However, 2023 research suggested that the traditional accounts of the Fuegian dog were in fact two different animals. The culpeo itself is similar to true foxes, though it is closer, genetically, to wolves, coyotes and jackals ; thus it is placed in a separate genus within the South American foxes or zorros.

<span class="mw-page-title-main">Cerdocyonina</span> Subtribe of carnivores

Cerdocyonina is an extant subtribe of the canines and is exclusively endemic to the Americas. Often described to be "fox-like" in appearance and behavior, they are more closely related to the wolf-like canids such as Canis than they are to the fox genus Vulpes. Its members are colloquially known as the South American canids and there are 10 extant species. They are sometimes referred to as South American foxes in the older literature, but the term zorro has been recommended by mammalogists to avoid confusion with the true foxes of the tribe Vulpini, which includes the genus Vulpes.

References

  1. 1 2 3 Pinkstone, Joe (2023-09-13). "First ever dog-fox hybrid discovered in the wild". The Telegraph. ISSN   0307-1235. Archived from the original on 2023-09-27. Retrieved 2023-09-28.
  2. 1 2 3 4 5 Mulholland, Meaghan (2023-09-27). "Meet 'Dogxim,' the world's first known dog-fox hybrid—and a genetic oddity". National Geographic. Archived from the original on 2023-09-28. Retrieved 2023-09-28.
  3. 1 2 3 4 Szynwelski, Bruna Elenara; Kretschmer, Rafael; Matzenbacher, Cristina Araujo; Ferrari, Flávia; Alievi, Marcelo Meller; de Freitas, Thales Renato Ochotorena (2023-08-03). "Hybridization in Canids-A Case Study of Pampas Fox (Lycalopex gymnocercus) and Domestic Dog (Canis lupus familiaris) Hybrid". Animals. 13 (15): 2505. doi: 10.3390/ani13152505 . PMC   10417603 . PMID   37570312.
  4. 1 2 3 Iyer, Sunita (2023-09-19). "First-ever dog-fox hybrid 'Dogxim' discovered in Brazil dies mysteriously, prompts investigation". Asianet News Network Pvt Ltd. Archived from the original on 2023-09-28. Retrieved 2023-09-28.
  5. 1 2 "Brazil unveils world's first confirmed dog-fox hybrid 'Dogxim' which barked like a dog and hunted like a fox". The Economic Times. 2023-09-14. ISSN   0013-0389. Archived from the original on 2023-09-17. Retrieved 2023-09-28.
  6. Castelló, José R. (2018-09-11). Canids of the World: Wolves, Wild Dogs, Foxes, Jackals, Coyotes, and Their Relatives. Princeton University Press. p. 49. ISBN   978-0-691-18541-5.
  7. Castelló, José R. (2018-09-11). Ibid. Princeton University Press. p. 15. ISBN   9780691176857.
  8. Perini, F. A.; Russo, C. a. M.; Schrago, C. G. (2010). "The evolution of South American endemic canids: a history of rapid diversification and morphological parallelism". Journal of Evolutionary Biology. 23 (2): 311–322. doi:10.1111/j.1420-9101.2009.01901.x. ISSN   1420-9101. PMID   20002250.
  9. 1 2 3 Pinkstone, Joe (2023-09-18). "World's first dog-fox at centre of government investigation". The Telegraph. ISSN   0307-1235. Archived from the original on 2023-09-28. Retrieved 2023-09-28.
  10. 1 2 Cassella, Carly (2023-09-27). "Curious Canine in Brazil Turns Out to Be a First-of-Its-Kind Hybrid". ScienceAlert. Archived from the original on 2023-09-27. Retrieved 2023-09-28.
  11. 1 2 3 4 5 Gibbs, Alice (2023-09-15). "Shelter rescues injured animal—turns out to be world's first dog-fox hybrid". Newsweek. Archived from the original on 2023-09-28. Retrieved 2023-09-28.
  12. 1 2 3 "Brazil's Enigmatic Dogxim: First-of-Its-Kind Canine Hybrid Between a Fox and a Dog Found in the Streets of Vacaria". The Science Times. 2023-09-27. Archived from the original on 2023-09-28. Retrieved 2023-09-28.
  13. 1 2 3 Fidler, Katherine (2023-09-20). "Mystery deepens around world's first dog-fox hybrid". Metro. Archived from the original on 2023-09-27. Retrieved 2023-09-28.
  14. 1 2 3 4 "Is it a dog or fox? Scientists finally make a decision on 'amazing animal'". ITV. 2023-09-14. Archived from the original on 2023-09-20. Retrieved 2023-09-28.
  15. 1 2 3 4 Higgs, Eleanor (2023-09-15). "First Documented Case Of Hybridization Between A Dog And A Pampas Fox". IFLScience. Archived from the original on 2023-09-28. Retrieved 2023-09-28.
  16. Brum-Zorrilla, N.; Langguth, A. (1980-09-01). "Karyotype of South American pampas of Pseudalopex gymnocercus (Carnivora, Canidae)". Experientia. 36 (9): 1043–1044. doi:10.1007/BF01965957. ISSN   0014-4754. PMID   7418837. S2CID   38697715. Archived from the original on 2023-09-28. Retrieved 2023-09-28.
  17. Sugasawa, Takehito; Matsumoto, Yuki; Fang, Hui; Takemasa, Tohru; Komine, Ritsuko; Tamai, Shinsuke; Gu, Wenchao; Tanaka, Kei; Kanki, Yasuharu; Takahashi, Yoichiro (2023). "Establishing a Sequencing Method for the Whole Mitochondrial DNA of Domestic Dogs". Animals. 13 (14): 2332. doi: 10.3390/ani13142332 . PMC   10375980 . PMID   37508109.