New Zealand lesser short-tailed bat

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Lesser short-tailed bat
Mystacina tuberculata.jpg
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Chiroptera
Family: Mystacinidae
Genus: Mystacina
Species:
M. tuberculata
Binomial name
Mystacina tuberculata
Gray, 1843
Subspecies

M. t. tuberculata
M. t. aupourica
M. t. rhyacobia

Mystacina tuberculata distribution.svg
Key:
  Range of M. t. aupourica
  Range of M. t. rhyacobia
  Range of M. t. tuberculata

The New Zealand lesser short-tailed bat (Mystacina tuberculata) is a small-sized omnivorous mammal endemic to the islands of New Zealand. It is one of two extant and three overall terrestrial mammal species unique to New Zealand. Its closest relative, the New Zealand greater short-tailed bat (M. robusta), was last seen in 1965 and is presumed extinct due to intense predation from ship rats introduced in the last few centuries. These bats are also commonly referred to as pekapeka, their Māori-language name. Lesser short-tailed bats have unique adaptations that differentiate them from bats found in other parts of the world. For example, they are fully capable of moving along the ground to search for food, and the males sing to attract partners, taking turns to do so. Lesser short-tailed bats are a vulnerable species, so extensive conservation work and research are being done to prevent extinction.

Contents

Taxonomy and evolution

Illustration of an individual Proceedings of the Zoological Society of London (Mammalia Plate LIV) (7629993166).jpg
Illustration of an individual

Taxonomic classification

Mystacina tuberculata are members of the suborder Yangochiroptera and have recently been placed in the superfamily Noctillionoidea. They are members of the family Mystacinidae, which contains the single genus Mystacina . Within Mystacina are the two closely related species, M. tuberculata and M. robusta. As it is likely that M. robusta has gone extinct, M. tuberculata is the only confirmed extant species within the genus and the family. The placement of this species within taxonomies and phylogenetic trees was previously a hotly debated topic. The current standing within the superfamily Noctillionoidea is the result of DNA sequencing and analysis. [2] In opposition to this, some scientists believe physical similarities indicate Mystacinidae falls under the superfamily Vespertilionoidea. [3] The phylogenetic position of this species has had a variety of other suggested propositions, including within the Phyllostomidae (Leaf-nosed bats) or the Emballonuridae (sac-winged and sheath-tailed bats). [4] While this species is considered to have subspecies, some sources refer to the species as one unit. The New Zealand Department of Conservation recognises three subspecies. These are divided by the region each inhabits; northern (Mystacina tuberculata aupourica), central (Mystacina tuberculata rhyacobi), and southern (Mystacina tuberculata tuberculata). [5]

Evolutionary history

It has been suggested that the Mystacinidae originated on the Australian continent [6] and that the superfamily Noctillionoidea originated on Gondwana. [7] When Gondwana split into smaller continents, the superfamily members became geographically isolated. This isolation led to millions of years of unique evolutionary history for each family. It has been estimated that Mystacinidae first became a distinct family between 68 and 35 million years ago. [8] Twenty million years ago, two genera emerged from the family; Mystacina and Icarops . Fossils of Icarops have been found throughout Australia, indicating the now-extinct species was once well dispersed there. [8] It is unknown when the species within this genera (I. aenae, I. breviceps, and I. paradox) became extinct.

Mystacina migrated from Australia to New Zealand. Based on fossil evidence, this genus was definitely in New Zealand during the Miocene. [9] Therefore, we know that Mystacina became a distinct genus around 20 million years ago and travelled from Australia to New Zealand anywhere from approximately 5.3 - 20 million years ago.[ citation needed ] This assumes that Icarops did not migrate to New Zealand, and that the colonisation event occurred after the genera became distinct. It is unclear when M. tuberculata and M. robusta became distinct species.

Distribution and range

Lesser short-tailed bats have been found in a few populations dispersed around the country. There are populations on both of the main islands, as well as various surrounding islands. There are a few key populations currently known. There is one on Little Barrier Island (Hauturu), one near the top of the North Island, seven in the central area of the North Island, and one on the south-eastern side of the North Island. There are at least two on the mainland of the South Island; and one on Codfish island further south. [10] The bats can live at a wide range of altitudes, from sea level to high up among the forest-covered mountains. [6] M. tuberculata prefer to live in untouched forest settings. However, they have been reported in various habitats, such as farmland and shrubland. [11]

Anatomy and physiology

The lesser short-tailed bats appear similar to their microbat relatives. They are small in size, and typically weigh between 12 and 15 grams (0.42 and 0.53 oz) once fully grown. [12] They have relatively large ears compared to their head and body sizes, which face forward to assist with echolocation. Lesser short-tailed bats also have relatively large nostrils that face outwards, allowing these animals to use olfaction to guide their movements. Their eyes are small and their vision is relatively weak, justifying their reliance on sound and olfactory senses.[ citation needed ] These features are common throughout Chiroptera.

Their wings are relatively smaller than those of other bat species. Because of this, they have reduced agility, and cannot fly as fast. [13] Despite this, they are still very capable of flight; just less so than other bat species. Each bat is covered in a layer of thick fur that ranges in colour from light brown to dark brown. The underbelly is typically a lighter colour than the rest of the body. At the posterior end of their bodies are short yet strong hindlegs, useful in their terrestrial locomotion. The relatively short stubby tails are what gives this species its common name. At the top centre of each forelimb, the thumb extends outwards. This, as well as their toes, are equipped with nails referred to as basal talons. Having distinct talons further enables movement along the ground, and are useful when climbing trees. [12] Basal talons are not seen in other Chiropteran species.

Torpor

One of the key adaptations the lesser short-tailed bats have is entering a state of torpor. Torpor allows for continued survival during periods of physiological stress, such as when the air temperature drops during winter. During this state, the bats are inactive and only essential body functions are operating to reduce energy expenditure. Entering torpor slows the body's metabolic rate down, yet it is different from hibernation, as the periods are much shorter and repetitive.

The duration of torpor is usually a few to several hours at a time, and the bats will enter this state several times within a season. Torpor is utilised throughout the year, but in particular during winter, where they also enter into this state for longer each time. [14] [15]

Foraging and diet

Preferred foods

Huhu beetle Huhu beetle 07.jpg
Huhu beetle

New Zealand lesser short-tailed bats are omnivores. Their diet consists of various food items, typically including insects, other small invertebrates, fruit, and flower parts. [16] In general, they prefer to consume insects when possible. One study found traces of moths, spiders, and huhu beetles present in their guano. [17] Another study found that these bats are capable of consuming half their body weight in moths. [12] An average body weight of 12 to 15 grams (0.42 to 0.53 oz) equates to 6 to 7.5 grams (0.21 to 0.26 oz) of moths eaten per day. The bats consume include nectar and pollen, the latter of which is believed to provide them with protein. [12] However, there has been speculation and debate on whether the bats consume the pollen intentionally or if the pollen found in their guano was actually ingested by their prey. [17] Nectar is consumed as the sugars provide a good, uncomplicated source of energy. Lesser short-tailed bats are an important pollinator species within New Zealand through their consumption of flowers (either by ingestion or secondarily through their prey). Researchers found that these bats will carry large quantities of pollen from a select few plant species, such as Collospermum microspermum and Dactylanthus taylorii (the Wood rose). [18] Ensuring conservation of the lesser short-tailed bats may also ensure conservation of the plant species they pollinate.

Foraging methods

One of the defining features of New Zealand lesser short-tailed bats is their ability to forage both in the air and on the ground. Their ability to forage on the ground is unusual for a bat species. However, New Zealand's early geographic separation around 80 million years ago [19] meant the islands developed free from predators. Without predators, the lesser short-tailed bat evolved to survive in both aerial and ground habitats. Like other bats, in the air, they catch food by using echolocation to detect the location of prey. The lesser short-tailed bats forage on the ground by moving around on their limbs, sourcing prey by using olfaction. [16] The species has several adaptations that aid in their search for food on the ground. For example, when on the ground, individuals will fold in their wings to utilise them as forelimbs—all four limbs in quadrupedal locomotion. In addition, they have talons specialised in helping them dig down among leaf litter and dirt layers for prey. [12] While moving about terrestrially, the bats walk similarly to other four-legged animals. [20] New Zealand lesser short-tailed bats have an increased sense of smell compared with other bats, as seen in their relatively larger and rounder nostrils. [6] Although, like other bats, they are not blind they are not heavily reliant on visual hunting, with cues like scent and sound being much more critical. Foraging on the ground can be used to dig up insects and spiders, collect flowers or fallen fruit, and collect other stationary forms of food. Foraging in the air is often associated with hunting flying insects, such as moths. During heavy rain foraging is uncommon, and during lighter rain foraging activity increases slightly. [21]

Bat using echolocation to hunt prey Chiroptera echolocation.svg
Bat using echolocation to hunt prey

Echolocation

Like other microbats, these bats employ echolocation when flying. [22] Lesser short-tailed bats emit sounds in the range of 20-40 kHz. Each call lasts between seven and nine milliseconds. [23] Echolocation does not work as efficiently while foraging on the ground, because the echoes can be disrupted by the forest floor and anything occupying this space. Another reason echolocation does not work when foraging on the ground is that the echoes bouncing back can interrupt the new echoes being sent out, causing confusion for the animal and preventing the system from working correctly. This issue does not occur when the bats are mid-air, as the sound has more distance to travel, and fewer objects could disrupt the signal or cause confusion.[ citation needed ]

Life cycle and social systems

Social systems and mating behaviour

Lesser short-tailed bats form fission-fusion societies. This means populations will congregate at certain times, separate, and recongregate later. Where these animals group together are known as roosts. For roosting, they prefer to find trees with large internal cavities, where they create their 'home'. A roosting site will contain multiple trees within the same general vicinity. The number of individuals present at a roosting site vary greatly, with some colonies consisting of hundreds or thousands of individual bats. [24]

Male bats attempt to attract a mate during the spring and summer months before mating begins, which is usually during autumn (March–May in New Zealand). Like many other species, the males attract mates at night by using vocal calls. The males will sing from one of the roosting trees within the colony for several minutes. Multiple males will aggregate at this same roost, taking turns singing. [24] This behaviour is classified as a lek breeding system. In this type of mating, sexual selection occurs, as the males signal to potential females in the hopes they will be impressed and mate with the male. Lek breeding is how the male bats 'prove their worth'. The mating events that follow are non-monogamous, and males have been observed to mate with multiple different females. [25] While lek breeding systems are observed throughout the animal kingdom, they are rare in bats and have only been observed in one other species.

Early life and life cycle

Lesser short-tailed bats roosting Southern short-tailed bats, Mystacina tuberculata.jpg
Lesser short-tailed bats roosting

Lesser short-tailed bat pups become active within a day of being born. For the first two days, they are hairless, with underdeveloped teeth, wings, and ears. [12] [26] The pups are capable of flying within roughly four weeks. Six weeks post-birth, they leave the maternity roosts they were raised in. After a few months they have reached their adult body size. [6] The pups are born in summer (December–February in New Zealand). During this summer birthing period, the dispersed individuals will regroup, forming a large colony. Pups will feed first on milk produced by their mothers. Each mother will give birth to a single pup per season. The result of this is higher maternal investment per offspring, however the non-monogamous mating system results in low paternal investment. The pups are raised in special sections of the colony's roosting site dedicated to maternal activities. Other female bats will group at these maternal roosts and aid in the rearing of pups.[ citation needed ]

There are no records of the average lifespan of lesser short-tailed bats. Other bats within the suborder Yangochiroptera have been observed to live for upwards of thirty years, which is unexpected for their small body sizes. [27] During spring/summer, male bats attract a female mate. These pairs will mate during autumn. During autumn and winter, the bats will disperse into smaller colony groups while the female bats are pregnant. Then, when it becomes summer again the bats regroup into a larger colony and the pups are born. Around autumntime, the pups have reached physical maturity. It is unclear at what age they reach sexual maturity.[ citation needed ]

Human impacts and conservation

Threats

Currently, NZ lesser short-tailed bats are classified as Vulnerable by the IUCN, with the number of individuals observed as declining over time. [28] The introduction of mammalian predators has had a massive impact on the species' numbers. Since the colonisation of New Zealand and the introduction of three key rat species the endemic bat populations have experienced a reduction in numbers. Polynesian rats (R. exulans) were one of the bat's main predators up until the 19th century, when the introduction of the black rat (R. rattus) and the brown rat (R. norvegicus) led to heavier predation. [29] Before mammalian predators colonised New Zealand, the lesser short-tailed bat was preyed on by predatory birds, such as the laughing owl. [11] Another common predator of these bats are common house cats, which will catch the bats as they fly out of their roosting sites. The bat roosts are very vulnerable, as they contain more potential prey within a single area. If these roosts were found by a predator, they could experience mass mortality events; in one incident, 102 lesser short-tailed bat deaths were caused by a single house cat in central North Island. [30]

Department of Conservation New Zealand DoC Emblem Logo.svg
Department of Conservation New Zealand

Another cause for their decline is increased use of the land for anthropogenic activities, such as logging and agriculture. These activities can often result in negative consequences for the local ecosystem, such as forest fragmentation. [31] For native animals in New Zealand, fragmentation poses threats such as reduced genetic diversity. However, it is possible that the lesser short-tailed bats will not be affected by forest fragmentation, as the species has been observed to show behavioural plasticity, through the ability to change/occupy different habitats. [25]

Current conservation plans

The current state of conservation for lesser short-tailed bats is being managed by the New Zealand Department of Conservation (DOC). The recovery plan in place since the late 1990s involves a multi-pronged approach of different actions to take to prevent this species from further endangerment. Some of the detailed actions include creating new bat populations on the various predator-free islands around New Zealand, surveying the mainlands to identify areas that require extra conservation efforts, and potentially creating a captive population. [32]

Related Research Articles

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References

  1. ↑ O'Donnell, C. (2021). "Mystacina tuberculata". IUCN Red List of Threatened Species . 2021: e.T14261A22070543. doi: 10.2305/IUCN.UK.2021-2.RLTS.T14261A22070543.en . Retrieved 22 November 2021.
  2. ↑ Kennedy, Martyn; Paterson, Adrian M.; Morales, Juan Carlos; Parsons, Stuart; Winnington, Andrew P.; Spencer, Hamish G. (November 1999). "The Long and Short of It: Branch Lengths and the Problem of Placing the New Zealand Short-Tailed Bat, Mystacina". Molecular Phylogenetics and Evolution. 13 (2): 405–416. doi:10.1006/mpev.1999.0660. ISSN   1055-7903. PMID   10603267.
  3. ↑ Jones Jr, J Knox; Carter, Dilford C (1976). "Annotated checklist, with keys to subfamilies and genera. Biology of bats of the new world family Phyllostomidae, part I." Lubbock: Museum Texas Tech. University. 10: 7–38. doi: 10.5962/BHL.TITLE.142603 . S2CID   83452376.
  4. ↑ Kirsch, John A. W.; Hutcheon, James M.; Byrnes, Deanna G. P.; Lloyd, Brian D. (1998). "Affinities and Historical Zoogeography of the New Zealand Short-Tailed Bat, Mystacina tuberculata Gray 1843, Inferred from DNA-Hybridization Comparisons". Journal of Mammalian Evolution. 5 (1): 33–64. doi:10.1023/A:1020519019830. S2CID   23809083.
  5. ↑ "Short-tailed bat". www.doc.govt.nz. Retrieved 2021-12-25.
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  7. ↑ Hand, Suzanne J.; Beck, Robin M. D.; Archer, Michael; Simmons, Nancy B.; Gunnell, Gregg F.; Scofield, R. Paul; Tennyson, Alan J. D.; De Pietri, Vanesa L.; Salisbury, Steven W.; Worthy, Trevor H. (2018-01-10). "A new, large-bodied omnivorous bat (Noctilionoidea: Mystacinidae) reveals lost morphological and ecological diversity since the Miocene in New Zealand". Scientific Reports. 8 (1): 235. Bibcode:2018NatSR...8..235H. doi:10.1038/s41598-017-18403-w. ISSN   2045-2322. PMC   5762892 . PMID   29321543.
  8. 1 2 Hand, Suzanne; Archer, Michael; Godthelp, Henk (2005-05-01). "Australian Oligo-Miocene Mystacinids (Microchiroptera): upper dentition, new taxa and divergence of New Zealand species". Geobios. 38 (3): 339–352. Bibcode:2005Geobi..38..339H. doi:10.1016/j.geobios.2003.11.005. ISSN   0016-6995.
  9. ↑ Tennyson, Alan J.D. (2010). "The origin and history of New Zealand's terrestrial vertebrates". New Zealand Journal of Ecology. 34 (1): 6–27. ISSN   0110-6465. JSTOR   24060711.
  10. ↑ Lloyd, Brian D. (2003). "The demographic history of the New Zealand short-tailed bat Mystacina tuberculata inferred from modified control region sequences". Molecular Ecology. 12 (7): 1895–1911. Bibcode:2003MolEc..12.1895L. doi:10.1046/j.1365-294X.2003.01879.x. ISSN   1365-294X. PMID   12803640. S2CID   33906414.
  11. 1 2 Lloyd, B. D. (2001-03-01). "Advances in New Zealand mammalogy 1990–2000: Short-tailed bats". Journal of the Royal Society of New Zealand. 31 (1): 59–81. Bibcode:2001JRSNZ..31...59L. doi: 10.1080/03014223.2001.9517639 . ISSN   0303-6758. S2CID   129564107.
  12. 1 2 3 4 5 6 Daniel, M. J. (1979-04-01). "The New Zealand short-tailed bat, Mystacina tuberculata; a review of present knowledge". New Zealand Journal of Zoology. 6 (2): 357–370. doi: 10.1080/03014223.1979.10428375 . ISSN   0301-4223.
  13. ↑ Norberg, Ulla M.; Rayner, J. M. V.; Lighthill, Michael James (1987-09-16). "Ecological morphology and flight in bats (Mammalia; Chiroptera): wing adaptations, flight performance, foraging strategy and echolocation". Philosophical Transactions of the Royal Society of London. B, Biological Sciences. 316 (1179): 335–427. Bibcode:1987RSPTB.316..335N. doi:10.1098/rstb.1987.0030.
  14. ↑ Czenze, Zenon J.; Brigham, R. Mark; Hickey, Anthony J. R.; Parsons, Stuart (January 2017). "Cold and alone? Roost choice and season affect torpor patterns in lesser short-tailed bats". Oecologia. 183 (1): 1–8. Bibcode:2017Oecol.183....1C. doi:10.1007/s00442-016-3707-1. hdl: 10294/8901 . ISSN   0029-8549. PMID   27561779. S2CID   37006674.
  15. ↑ Geiser, F.; Brigham, R. M. (2000-03-01). "Torpor, thermal biology, and energetics in Australian long-eared bats (Nyctophilus)". Journal of Comparative Physiology B. 170 (2): 153–162. doi:10.1007/s003600050270. ISSN   1432-136X. PMID   10791575. S2CID   5775476.
  16. 1 2 Jones, Gareth; Webb, Peter I.; Sedgeley, Jane A.; O'Donnell, Colin F. J. (2003-12-01). "Mysterious Mystacina: how the New Zealand short-tailed bat(Mystacina tuberculata) locates insect prey". Journal of Experimental Biology. 206 (23): 4209–4216. doi:10.1242/jeb.00678. ISSN   0022-0949. PMID   14581591. S2CID   36430937.
  17. 1 2 Daniel, M. J. (1976-12-01). "Feeding by the short-tailed bat (Mystacina tuberculata) on fruit and possibly nectar". New Zealand Journal of Zoology. 3 (4): 391–398. doi:10.1080/03014223.1976.9517927. ISSN   0301-4223.
  18. ↑ Cummings, G.; Anderson, S.; Dennis, T.; Toth, C.; Parsons, S. (2014). "Competition for pollination by the lesser short-tailed bat and its influence on the flowering phenology of some New Zealand endemics". Journal of Zoology. 293 (4): 281–288. doi:10.1111/jzo.12147. ISSN   1469-7998.
  19. ↑ Goldberg, Julia; Trewick, Steven A; Paterson, Adrian M (2008-10-27). "Evolution of New Zealand's terrestrial fauna: a review of molecular evidence". Philosophical Transactions of the Royal Society B: Biological Sciences. 363 (1508): 3319–3334. doi:10.1098/rstb.2008.0114. PMC   2607375 . PMID   18782728.
  20. ↑ Riskin, Daniel K.; Parsons, Stuart; Schutt, William A. Jr; Carter, Gerald G.; Hermanson, John W. (2006-05-01). "Terrestrial locomotion of the New Zealand short-tailed bat Mystacina tuberculata and the common vampire bat Desmodus rotundus". Journal of Experimental Biology. 209 (9): 1725–1736. doi: 10.1242/jeb.02186 . ISSN   0022-0949. PMID   16621953. S2CID   18305396.
  21. ↑ Czenze, Zenon; Thurley, Tertia (February 2021). "Dactylanthus flower visitation by New Zealand lesser short-tailed bats appears to be influenced by daily rainfall". New Zealand Journal of Ecology. doi: 10.20417/nzjecol.45.8 . ISSN   0110-6465. S2CID   231983713.
  22. ↑ Simmons, James A.; Stein, Roger A. (1980). "Acoustic imaging in bat sonar: Echolocation signals and the evolution of echolocation". Journal of Comparative Physiology A. 135 (1): 61–84. doi:10.1007/bf00660182. ISSN   0340-7594. S2CID   20515827.
  23. ↑ Parsons, Stuart (January 1998). "The effect of recording situation on the echolocation calls of the New Zealand lesser short-tailed bat(Mystacina tuberculataGray)". New Zealand Journal of Zoology. 25 (2): 147–156. doi:10.1080/03014223.1998.9518145. ISSN   0301-4223.
  24. 1 2 Collier, K. (2020). Attributes of Social Organisation and Male Singing Behaviour in the Lesser Short-Tailed Bat, Mystacina tuberculata (Doctoral dissertation, ResearchSpace@ Auckland).
  25. 1 2 Toth, Cory A.; Dennis, Todd E.; Pattemore, David E.; Parsons, Stuart (2015). "Females as mobile resources: communal roosts promote the adoption of lek breeding in a temperate bat". Behavioral Ecology. 26 (4): 1156–1163. doi: 10.1093/beheco/arv070 . ISSN   1045-2249.
  26. ↑ Searchfield, D. (January 2016). "First breeding and hand rearing of the New Zealand lesser short-tailed bat Mystacina tuberculata at Auckland Zoo". International Zoo Yearbook. 50 (1): 165–173. doi:10.1111/izy.12121. ISSN   0074-9664.
  27. ↑ Dammann, Philip (October 2017). "Slow aging in mammals—Lessons from African mole-rats and bats". Seminars in Cell & Developmental Biology. 70: 154–163. doi:10.1016/j.semcdb.2017.07.006. ISSN   1084-9521. PMID   28698112.
  28. ↑ O'Donnell, C. (2020-10-15). "Mystacina tuberculata". The IUCN Red List of Threatened Species 2021. doi: 10.2305/iucn.uk.2021-2.rlts.t14261a22070543.en . S2CID   239146418.{{cite journal}}: Cite journal requires |journal= (help)
  29. ↑ King, Carolyn M.; Foster, Stacey; Miller, Steven (2011-06-23). "Invasive European rats in Britain and New Zealand: same species, different outcomes". Journal of Zoology. 285 (3): 172–179. doi:10.1111/j.1469-7998.2011.00827.x. ISSN   0952-8369.
  30. ↑ Scrimgeour, J; Beath, A; Swanney, M (September 2012). "Cat predation of short-tailed bats (Mystacina tuberculata rhyocobia) in Rangataua Forest, Mount Ruapehu, Central North Island, New Zealand". New Zealand Journal of Zoology. 39 (3): 257–260. doi: 10.1080/03014223.2011.649770 . ISSN   0301-4223. S2CID   84907680.
  31. ↑ Adepoju, Kayode Adewale; Salami, Ayobami T. (2017-10-25). "Geospatial Assessment of Forest Fragmentation and its Implications for Ecological Processes in Tropical Forests". Journal of Landscape Ecology. 10 (2): 19–34. doi: 10.1515/jlecol-2017-0002 . ISSN   1805-4196. S2CID   89729777.
  32. ↑ Molloy, Janice (1995). Bat (Peka peka) recovery plan (Mystacina, Chalinolobus). M. J. Daniel, New Zealand. Threatened Species Unit. Wellington, N.Z.: Threatened Species Unit, Dept. of Conservation. ISBN   0-478-01570-4. OCLC   154583004.
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