Wed . 18 Nov 2018

Monito del monte

monito del monte, monito del monte chile
Didelphys australis Goldfuss, 1812
Dromiciops australis F Philippi, 1893

The monito del monte Spanish for "little monkey of the bush" or colocolo opossum,[3] Dromiciops gliroides, also called chumaihuén in Mapudungun, is a diminutive marsupial native only to southwestern South America Argentina and Chile It is the only extant species in the ancient order Microbiotheria, and the sole New World representative of the superorder Australidelphia all other New World marsupials are members of the paraphyletic "Ameridelphia" The species is nocturnal and arboreal, and lives in thickets of South American mountain bamboo in the Valdivian temperate rain forests of the southern Andes,[1] aided by its partially prehensile tail[4] It eats primarily insects and other small invertebrates, supplemented with fruit[4]

Contents

  • 1 Taxonomy and etymology
  • 2 Phylogeny and biogeography
  • 3 Habitat
  • 4 Morphology
  • 5 Reproduction
  • 6 Habits
  • 7 Diet
  • 8 Conservation
  • 9 References
  • 10 Sources

Taxonomy and etymology

The monito del monte is the sole extant member of the order Microbiotheria[2] It was first described by English zoologist Oldfield Thomas in 1894 The generic name Dromiciops is based on the resemblance of the monito del monte to the eastern pygmy possum Cercartetus nanus, one of the synonyms of which is Dromicia nana The specific name gliroides is a combination of the Latin gliris "dormouse", more generally "rodent" and Greek oides "similar to" The name australis in a synonym D australis refers to the southern distribution of the animal[5]

In his 1943 Mammals of Chile, American zoologist Wilfred Hudson Osgood identified two subspecies of the monito del monte:[6]

  • D a australis F Philippi, 1893: It occurs in the Valdivian temperate rain forest in southcentral Chile
  • D a gliroides Thomas, 1894: It occurs in the northeastern Chiloé Island

Phylogeny and biogeography

Phylogenetic and biogeographic position of the monito del monte relative to other extant marsupials

South American marsupials have long been suspected to be ancestral to those of Australia, consistent with the fact that the two continents were connected via Antarctica in the early Cenozoic Australia’s earliest known marsupial is Djarthia, a primitive mouse-like animal that lived in the early Eocene about 55 million years ago mya Djarthia had been identified as the earliest known australidelphian, and this research suggested that the monito del monte was the last of a clade that included Djarthia[7] This relationship suggests that the ancestors of the monito del monte might have reached South America by back-migration from Australia The time of divergence between the monito del monte and Australian marsupials was estimated to have been 46 mya[4]

However, in 2010, analysis of retrotransposon insertion sites in the nuclear DNA of a variety of marsupials, while confirming the placement of the monito del monte in Australidelphia, also clarified that its lineage is the most basal of that superorder The study further confirmed that the most basal of all marsupial orders are the other two South American lineages Didelphimorphia and Paucituberculata, with the former probably branching first This conclusion indicates that Australidelphia arose in South America along with the ancestors of all other living marsupials, and probably reached Australia in a single dispersal event after Microbiotheria split off[8][9][10] Fossils of another Eocene australidelphian, the microbiotherian Woodburnodon casei, have been described from the Antarctic peninsula,[11] and fossils of a related early Eocene woodburnodontid have been found in Patagonia[12]

Habitat

Monitos del monte live in the dense, humid forests of highland Argentina and Chile,[13][14][15] mainly in trees, where they construct spherical nests of water resistant colihue leaves These leaves are then lined with moss or grass, and placed in well-protected areas of the tree, such as underbrush, tree cavities, or fallen timber[16] The nests are sometimes covered with grey moss as a form of camouflage These nests provide the monito del monte with some protection from the cold, both when it is active and when it hibernates

Morphology

Monitos del monte are small marsupials that look like mice Dromiciops have the same dental formula as Didelphids: 51344134, a total of 50 teeth[16] Their size ranges from 16–42 g 056–148 oz They have short and dense fur that is primarily brown-gray with patches of white at their shoulders and back, and their underside is more of a cream or light gray color Monitos del monte also have distinct black rings around their eyes Their small furred ears are well-rounded and their rostrums are short The head to body length is around 8–13 cm 31–51 in, and their tail length is between 9 and 13 cm 35 and 51 in Their tails are somewhat prehensile and mostly furred with the exception of 25–30 mm 098–118 in of the underside[17] The naked underside of their tails may contribute to increasing friction when the mammal is on a tree The base of their tails also functions as a fat storage organ which they use during winter hibernation[18] In a week, monitos del monte can store enough fat to double their body size[16]

Sexual dimorphism

At the end of the summer, female Monitos del monte tend to be larger and heavier than males The tails of the sexes also vary in size during this time; females have a thicker tail, which is where they store fat; the difference suggests that females need more energy than males during hibernation The sexual dimorphism is only seen during this time and not year-round[17]

Reproduction

Monitos del monte have a monogamous mating system The females have well-formed, fur-lined marsupium containing four mammae They normally reproduce in the spring once a year and can have a litter size varying from one to five They can feed a maximum of four offspring, so if there are five young, one will not survive[17] When the young are mature enough to leave the pouch, approximately five months, they are nursed in a distinctive nest They are then carried on the mother's back The young remain in association with the mother after weaning Males and females both reach sexual maturity after two years[2][19][20][21]

Habits

A monito del monte in state of torpor

The monito del monte is adapted to arboreal life; its tail and paws are prehensile It is largely nocturnal and, depending on the ambient and internal temperature, and on the availability of food, it spends much of the day in a state of torpor Such behaviour enables it to survive periods of extreme weather and food shortage, conserving energy instead of foraging to no effect

The animal covers its nest with moss for concealment, and for insulation and protection from bad weather[17][22]

Diet

Monitos del monte are primarily insectivores They eat insects and other invertebrates they find on the branches of trees and cracks in bark, but during the summer they eat large quantities of fruit, especially mistletoe fruit[17]

Seed-dispersing role

A study performed in the temperate forests of southern Argentina showed a mutualistic seed dispersal relationship between D gliroides and Tristerix corymbosus, also known as the loranthacous mistletoe The monito del monte is the sole dispersal agent for this plant, and without it the plant would likely become extinct The monito del monte eats the fruit of T corymbosus, and germination takes place in the gut Scientists speculate that the coevolution of these two species could have begun 60–70 million years ago[23][24]

Conservation

For the past few years the number of Dromiciops has declined, and the species is now classified as 'near threatened' Many factors contribute to the decline:

  • its already limited habitat is constantly faced with deforestation and fragmentation;
  • the introduction of the domestic cat, Felis catus, is correlated with decrease in numbers of Dromiciops
  • the creature is considered bad luck by natives – houses have been burned down after monitos del monte were seen inside;
  • other people believe this marsupial is venomous or causes disease, though in reality they do not affect humans negatively[16][17]

The monito del monte is not the only organism which will be affected if it becomes endangered Dromiciops illustrate parasite-host specificity with the tick Ixodes neuquenensis This tick can only be found on the monito del monte, so it depends on the survival of this nearly endangered mammal[16][25] T corymbosus also depends on the survival of this species, because without the seed dispersal agency of the monito del monte, it would not be able to reproduce

Little conservation effort is being undertaken at the moment, but there are ecological studies being conducted in the Chiloé Island that might help future conservation efforts Dromiciops has been found in the Los Ruiles National Reserve and the Valdivian Coastal Reserve, which are protected areas in Chile[22]

References

  1. ^ a b Martin, Flores & Teta 2015
  2. ^ a b c Gardner 2005, p 21
  3. ^ Martinez, D R 1993 "Food habits of the rufous-legged owl Strix rufipes in temperate rainforests of southern Chile" Journal of Raptor Research 27 4: 214–216: 214 The colocolo opossum Dromiciops australis was better represented during spring and summer than during autumn and winter 
  4. ^ a b c Edge 2006
  5. ^ Marshall, LG 1978 "Dromiciops australis" PDF Mammalian Species 99: 1–5 JSTOR 3504051 
  6. ^ Osgood, WH 1943 The Mammals of Chile Chicago, US: Field Museum of Natural History pp 48–50 
  7. ^ Beck et al 2008
  8. ^ Schiewe 2010
  9. ^ Inman 2010
  10. ^ Nilsson et al 2010
  11. ^ Goin, F J; Zimicz, N; Reguero, M A; Santillana, S N; Marenssi, S A; Moly, J J 2007 "New marsupial Mammalia from the Eocene of Antarctica, and the origins and affinities of the Microbiotheria" Revista de la Asociación Geológica Argentina 62 4: 597–603 Retrieved 2016-07-17 
  12. ^ Goin, F J; Woodburne, M O; Zimicz, A N; Martin, G M; Chornogubsky, L 16 October 2015 A Brief History of South American Metatherians: Evolutionary Contexts and Intercontinental Dispersals Springer p 216 ISBN 978-94-017-7420-8 
  13. ^ Mcdonald 1995
  14. ^ Nowak & Dickman 2005
  15. ^ Lord 2007
  16. ^ a b c d e Feldhamer 2007
  17. ^ a b c d e f Chick 2013
  18. ^ Chester 2008
  19. ^ Spotorno et al 1997
  20. ^ Brugni & Flores 2007
  21. ^ Lidicker & Ghiselin 1996
  22. ^ a b "Monito del Monte" Widescreen Arkive Retrieved 9 December 2014 
  23. ^ Garcia, Rodríguez-Cabal & Amico 2009
  24. ^ Amico, Rodriguez-Cabal & Aizen 2009
  25. ^ Guglielmone et al 2004

Sources

  • Amico, G C; Rodriguez-Cabal, M A; Aizen, M A 2009 "The potential key seed-dispersing role of the arboreal marsupial Dromiciops gliroides" Acta Oecologica Elsevier 35 1: 8–13 doi:101016/jactao200807003 
  • Beck, R M D; Godthelp, H; Weisbecker, V; Archer, M; Hand, S J 2006 Hawks, John, ed "Australia's Oldest Marsupial Fossils and their Biogeographical Implications" PLoS ONE Public Library of Science 3 3: e1858 doi:101371/journalpone0001858 PMC 2267999  PMID 18365013 
  • Brugni, N; Flores, V R 2007 "Allassogonoporus dromiciops n sp Digenea: Allassogonoporidae from Dromiciops gliroides Marsupialia: Microbiotheriidae in Patagonia, Argentina" Systematic Parasitology Springer 68 1: 45–48 doi:101007/s11230-006-9083-1 PMID 17401634 
  • Chester, S 2008 A wildlife guide to Chile : continental Chile, Chilean Antarctica, Easter Island, Juan Fernandez Archipelago 1 ed Princeton, NJ: Princeton University Press p 292 ISBN 978-0691129761 
  • Chick, J 2013 "Dromiciops gliroides" Animal Diversity Web University of Michigan Retrieved 8 March 2015 
  • Martin, GM; Flores, D; Teta, P 2015 "Dromiciops gliroides" IUCN Red List of Threatened Species IUCN 2015: eT6834A22180239 doi:102305/IUCNUK2015-4RLTST6834A22180239en Retrieved 9 August 2016 
  • "Monito del monte Dromiciops gliroides" EDGE of Existence programme Zoological Society of London 2006 Retrieved 5 July 2009 
  • Feldhamer, G A 2007 Mammalogy : adaptation, diversity, ecology 3rd ed Baltimore: Johns Hopkins University Press ISBN 978-0801886959 
  • Garcia, D; Rodríguez-Cabal, M A; Amico, G C 2009 "Seed dispersal by a frugivorous marsupial shapes the spatial scale of a mistletoe population" Journal of Ecology British Ecological Society 97 2: 217–229 doi:101111/j1365-2745200801470x 
  • Gardner, AL 2005 "Order Microbiotheria" In Wilson, DE; Reeder, DM Mammal Species of the World: A Taxonomic and Geographic Reference 3rd ed Johns Hopkins University Press p 21 ISBN 978-0-8018-8221-0 OCLC 62265494 
  • Guglielmone, A A; Venzal, J M; Amico, G; Mangold, A J; Keirans, J E 2004 "Description of the nymph and larva and redescription of the female of Ixodes neuquenensis Ringuelet, 1947 Acari: Ixodidae, a parasite of the endangered Neotropical marsupial Dromiciops gliroides Thomas Microbiotheria: Microbiotheriidae" Systematic Parasitology 57 3: 211–9 doi:101023/B:SYPA0000019082961879c PMID 15010595 
  • Inman, M 2010 "Jumping Genes Reveal Kangaroos' Origins" PLoS Biology Public Library of Science 8 7: e1000437 doi:101371/journalpbio1000437 PMC 2910652  PMID 20668663 
  • Lidicker, W Z; Ghiselin, M T 1996 Biology Menlo Park, California: The Benjamin/Cummings Publishing Company 
  • Lord, R D 2007 Mammals of South America Johns Hopkins University Press 
  • Macdonald, D, ed 1995 Encyclopedia of mammals 2nd ed Andromeda Oxford ISBN 978-1871869620 
  • Nilsson, M A; Churakov, G; Sommer, M; Van Tran, N; Zemann, A; Brosius, J; Schmitz, J 2010 Penny, D, ed "Tracking Marsupial Evolution Using Archaic Genomic Retroposon Insertions" PLoS Biology Public Library of Science 8 7: e1000436 doi:101371/journalpbio1000436 PMC 2910653  PMID 20668664 
  • Nowak, R M; Dickman, C R 2005 Walker's Marsupials of the World Johns Hopkins University Press 
  • Schiewe, J 2010-07-28 "Australia's marsupials originated in what is now South America, study says" LATimesCom Los Angeles Times Retrieved 1 August 2010 
  • Spotorno, A E; Marin, J C; Yevenes, M; Walker, L I; Fernández-Donoso, R F; Pincheira, J; Berrios, M S; Palma, R E 1997 "Chromosome Divergences Among American Marsupials and the Australian Affinities of the American Dromiciops" Journal of Mammalian Evolution Springer 4 4: 259–269 doi:101023/A:1027374514503 

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Monito del monte


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