Posts Tagged ‘rangifer tarandus’

Castration could save reindeer in warming Arctic

January 30, 2011

MSNBC – original article here

TROMSOE, Norway — Indigenous Sami peoples in the Arctic may have found a way to help their reindeer herds cope with climate change: more castration.

Research by Sami experts shows that sterilized males can grow larger and so are better at digging for food — as Arctic temperatures vary more, thawing snow often refreezes to form thick ice over lichen pastures.

Alissa de Carbonnel / AFP - Getty Images Reindeer herds like this one in Lovozero, Russia, are part of the native Arctic culture.

Neutered males are more able to break through ice with their hooves or antlers, and seem more willing than other males to move aside and share food with calves that can die of starvation in bad freeze-thaw winters like 2000-01.

“To make herds more resilient in the future, we need to re-learn the traditional knowledge of castration,” said professor Svein Mathiesen, coordinator of the University of the Arctic’s Institute of Circumpolar Reindeer Husbandry.

More castration “could be useful to adapt to climate change,” he told Reuters in the Arctic city of Tromsoe. “These animals are very good diggers for the small calves in the most critical period of the winter.”

Castration has traditionally been used by reindeer herders, partly to make wild animals more docile. Herders on the Yamal peninsula in Russia still neuter about half of all males — usually by biting into the testicles with their teeth.

Far fewer animals are castrated outside Russia. About 100,000 Sami own about 2.5 million reindeer in homelands in the Nordic countries and Russia.

The traditional Sami biting technique aims for “half-castration” — under which the animals become sterile but still produce some of the male hormone testosterone that promotes muscle growth.

Sami in Norway, where laws limit castration to surgery with anesthetics, are now experimenting with a vaccine to recreate the effects of half-castration.

No interest in sex also helps neutered males in winter.

“Males castrated in the traditional way would have an increased chance of survival over other males since they maintain body weight and condition during the rutting season,” according to a research document by Eli Risten Nergaard of Sami University College.

The Arctic region is warming at double the global rate in a trend blamed by the U.N.’s panel of climate scientists on greenhouse gases from mankind’s burning of fossil fuels.

Yamal herders castrate many of their reindeer, partly because they need strong, docile animals to pull heavy sleds. In Norway, Sami have come to rely on snow-scooters and get most money for calf meat, meaning most males are slaughtered young.

The Sami castration study indicates the complexities of adapting to the impacts of climate change. Many other scientists are focusing on issues such as how to cope with river floods or rising sea levels, or ways to develop drought-resistant crops.

Castrated reindeer also keep their antlers for much of the winter while normal males shed their antlers each autumn after the mating season. That implies that Rudolph, pulling Father Christmas’s sled, has been castrated.

Reindeer escapes in Sunderland!

December 19, 2010

Original article here

A reindeer has been spotted in the loose in Sunderland after escaping from its enclosure at a local park.

A reindeer like this was on the loose in Sunderland

A reindeer like this one escaped and trotted through the city centre

It’s thought that a dog scared the creature, causing it to leap over a fence and make a dash for freedom.

It trotted through the city centre, followed by police cars, while loads of people were out Christmas shopping.

The reindeer was finally caught and returned – unharmed – to the park, where extra fencing has now been put up to stop any more animal escapes.

Olive Fraser, who spotted the reindeer running through the street, said: “We were just standing in the forecourt of the garage and I just caught a glance.

“I knew it wasn’t a dog because it was so big but when I went out there was no sign of it.”

The council are now reminding dog owners to keep their pets on leads.

Psychedelic Berlin art show hosts live reindeer, canaries and mice

November 7, 2010

5 Nov 10 – original article here


A fantastical exhibition by renowned artist Carsten Höller featuring live reindeer, canaries, mice and flies opened Friday at Berlin’s Hamburger Bahnhof contemporary art museum. “Soma” also offers the chance for a limited number of guests to overnight in a bed suspended above the animals for €1,000.

Höller’s exhibition directs the real-life quest to rediscover the ingredient of a mythical drink into the realm of art, the museum says.

The artist was inspired by a verse in the ancient Hindu text, the Rigveda, which reads: “We have drunk of the soma; we have become immortal, we have seen the light; we have found the Gods.”

In the 20th century, philologists, ethnologists and botanists have tried to identify the main ingredient of the enlightening beverage, the ingredients of which were lost over the years, the museum said in a statement.

But in 1968, American banker and hobby mycologist Gordon R. Wasson made the highly-disputed suggestion that the red and white poisonous fly Amanita mushroom may have been the ingredient, and that it may have been absorbed through the urine of reindeer, which eat the plant as part of their natural diet.

With this in mind, Belgian-born Höller, who studied agricultural sciences, has created a massive dual-sided “experiment.” Here 12 reindeer and other animals exist in two halves of the museum’s large hall – one side reflective of the “normal world,” and the other a scene from the psychedelic “realm of soma.”

“It’s about pondering,” he said on Wednesday.

The reindeer, brought to Berlin from Brandenburg’s Uckermark region, are reportedly relaxed and accustomed to human contact.

Other parts of the exhibition include mushroom sculptures and the limited possibility for visitors to spend the night alone in the museum with the live animals. Almost all of the available nights have already been purchased, the museum reported.

Each week the museum will hold a lottery drawing for one free overnight stay, though.

Stockholm-based Höller was born in 1961 in Brussels. He is best known for his 2006 work “Test Site” at London’s Tate Modern.

“Soma” runs from November 5, 2010 to February 6, 2011.

The Local/DPA/ka 

External link: More information here (in English) »

 

Pouches, pockets and sacs in the heads, necks and chests of mammals, part IV: reindeer and a whole slew of others

October 31, 2010

Reposted from the science blog of Darren Naish

I really must get this series on pouches, sacs and pockets finished. Last time, we looked at baleen whales (and then I got distracted by Caperea): in these animals, a large, inflatable laryngeal sac is used in producing loud, resonating noises (though roles in gas storage or the mechanics of exhalation have also been suggested).

Caribou_Karen-Laubenstein-USFWS-wikipedia-Oct-2010.jpg

Another ventrally located laryngeal sac is present in the Reindeer Rangifer tarandus [photo above, by Karen Laubenstein, from wikipedia, shows an Alaskan reindeer with wonderfully elaborate antlers]. The sac originates from the trachea close to the epiglottis, is present in both sexes (though is much larger in males, reaching 4000 cubic cm when inflated), and can extend asymmetrically either along the left or right side of the neck (Frey et al. 2007).

Rangifer-call-posture-Frey-et-al-2007-Oct-2010.jpg

During the rut, males adopt a characteristic posture where the head and neck are kept low and the throat is extended [shown here, from Frey et al. (2007)]. Because the air sac is seen to inflate and deflate as the deer calls, an acoustic role for the sac is obvious (the noises made by calling reindeer are difficult to describe: they make hoarse, repetitive guttural noises).

Exactly what effect the throat sac has on the sounds generated in the larynx is unclear. One suggestion is that the sac augments the acoustic output of the vocal tract, such that the resulting noise combines output from the mouth and nose with output from the sac, emitted via the soft tissues of the neck. In other words, the sac ‘filters’ the sounds produced in the vocal tract (in acoustics, a filter is “a resonator that absorbs energy at certain resonance frequencies” (Freyet al. 2007, p. 151)). Because displaying males approach females broad-side in what’s been called a ‘broadside acoustic display’, it appears likely that the sounds generated by these deer mostly emanate sideways.

Other acts of acoustic weirdness in Cervidae

The evolution of this remarkable laryngeal structure is made all the more, err, remarkable by the fact that it’s (so far as we know) completely novel within Cervidae, this despite the fact that other deer lineages have evolved profound modifications to enhance their calls [calling male Red deer shown below, image by Bill Ebbesen, from wikipedia. That lump in the throat corresponds to a highly mobile larynx that descends way down in the neck during vocalisation. Read on].

Red_deer_stag_2009_Bill-Ebbesen-Denmark-wikipedia-Oct-2010.jpg

As we’ve seen before, Red deer Cervus elaphus and Fallow deer Dama dama use laryngeal retractors and an elastic thyrohyoid linkage to pull the larynx down toward the chest and thereby decrease the formant frequencies of their calls (Fitch & Reby 2001, McElligott et al. 2006) (and formant frequencies are known to correlate with female preference and mating success in both Red and Fallow deer: see Charlton et al. (2007), Vannoni & McElligott (2008) and Reby et al. (2010). Incidentally, it’s probably true to say – as some have – that the vocal behaviour of Red deer has been more studied than that of any other mammal outside of Primates). Wapiti C. canadensis retract the larynx markedly as well (and I follow Geist (1999) and Groves (2005) in regarding the Wapiti as a separate species from Red deer*). Phylogenies show that Red deer and Wapiti belong to a disparate lineage relative to Fallow deer (e.g., Pitra et al. 2004): even if Cervus and Dama are sister-taxa, there are still numerous taxa in the Cervus clade that lack the laryngeal structures seen in the C. elaphusC. canadensis clade, and seen in D. dama. Their similar laryngeal anatomies must therefore have evolved convergently.

* Some other deer traditionally included in C. elephus also deserve to be recognised as separate species: I will avoid discussing this mess for now and point the interested reader to Pitra et al. (2004) and Groves (2005).

Similar elastic structures are absent in reindeer: there’s no indication that they can move the larynx in the same way.

Peculiar noises are also made by some other large deer, but in this case I’m not talking about vocal noises; White-lipped deer Przewalskium albirostre, Père David’s deer Elaphurus davidianus, Red deer, Wapiti and Reindeer all produce clicking or cracking noises in their joints as they walk (McCullough 1969, Thomas & Toweill 1982, Geist 1999). Red deer only seem to produce the cracking noise in the forelimbs, while Reindeer at least produce cracking in both fore- and hindlimbs.

We looked some time ago at joint-clicking in eland: remarkably, the noises made by the joints of these antelopes form part of their dominance displays (Bro-Jørgsen & Dabelsteen 2008). Could the same be true of the joint-clicking deer? A popular idea is that the clicking noises provide information on the whereabouts of other herd members, and also on the approach of possible danger. I don’t know if anyone has studied this (though humans who hunt deer have certainly been very interested in it) – let me know.

One more interesting thing to note on deer and acoustics: it has been suggested that the enormous palmate antlers of Moose Alces alces may work as parabolic reflectors that help collect sound (Bubenik & Bubenik 2008) [spectacular Alaskan moose shown below; photo by Donna Dewhurst, from wikipedia. Note the profound asymmetry in the antlers… fluctuating asymmetry, another subject I must cover some time].

Moose-Donna-Dewhurst-Alaska-wikipedia-Oct-2010.jpg

Moose ears are large and sensitive, but these authors showed that a moose can increase the acoustic pressure in its ears by about 19% if it points the ears towards the antlers rather than toward the sound source. I would assume that this effect is incidental given that the antlers are still shed annually, mostly play a role in sexual combat and display, and are absent in females (one would assume that they would be retained year-round, and be present in females, if an acoustic role provided a selective advantage). However, moose that inhabit Alaskan tundra environments have the biggest antlers, and this is a habitat where sound travels furthest. Then again, visual signals would also travel furthest, so – as usual – things are not clear-cut.

Reindeer are ‘grotesque giants’

Having shown that Reindeer are unexpectedly weird by virtue of their laryngeal sacs, it’s only right to say that they’re really interesting for lots of other reasons: with their elaborate antlers (proportionally, the biggest of any deer), cursorial specialisations, large body size (second largest New World deer), long neck manes, large fat stores and highly peculiar, complex pigmentation (they have capes, rump patches, lateral stripes, forehead patches, eye rings and ‘socks’*), they’re flamboyant animals that can be regarded as ‘extreme’ members of their group (incidentally, the neck mane might be a visual signal linked to the neck sac) [Rangifer and Alces are shown in the diagram below as extreme members of the mostly New World deer clade that includes brockets, roe deer, reindeer and moose (from Geist (1999))].

New-World-deer-Geist-1999-Oct-2010.jpg

Geist (1999) referred to animals of this sort as ‘grotesque giants’ and noted that they tend to have evolved in cold, harsh Ice Age environments. Gould used the term ‘asynchronous hypermorphs’ for the same set of species. Other examples – according to Geist – include moose, wapiti, muskox, woolly rhinos, short-faced bears and humans.

* Pigmentation patterns are highly variable in reindeer, with some forms being far more elaborately patterned than others. Eurasian tundra reindeer are the most elaborate.

More laryngeal bullae than you can shake a stick at

Frey-et-al-2007-laryngeal-bulla-diversity-Oct-2010.jpg

So far in this series of articles, we’ve looked at primates, baleen whales and reindeer. But these are far from the only mammals with laryngeal diverticula located on the midline of the throat: small sac-like structures located on the ventral surface are also present in opossums (Didelphis), quolls (Dasyurus), some phalangers (Trichosurusand Phalanger), swamp wallabies (Wallabia), hedgehogs (Erinaceus), squirrels (Sciurus), marmots (Marmota), water voles (Arvicola), tapirs (Tapirus), horses (Equus), boar (Sus), eland (Tragelaphus), saiga (Saiga), takin (Budorcas), some bears (Ursus), wolves (Canis lupus), southern sea lions (Otaria) and various others (see Frey et al. (2007) for a complete list: their table, with adjacent diagrams showing laryngeal diverticula position, is shown here).

In some taxa, these structures are associated with enlarged hyoid bullae (like those looked at previously in apes and howler monkeys), but in others they are not. And in some of these mammals, these diverticula are paired; in others they are single. In the marsupials with a laryngeal diverticulum, and also in eland, saiga and takin, the structures are housed inside an inflated bulla formed from the thyroid cartilage (and are thus contained within the larynx). As yet, the role that these many diverticula might play in vocalising and other aspects of behaviour has been little investigated for most of the species concerned. Roland Frey and his colleagues have, however, been publishing some great studies on the laryngeal anatomy and vocalisation in such species as muskox, takin and weird gazelles. More soon!

For the previous articles on pouches, pockets and sacs in mammal heads, necks and chests, see…

And for previous Tet Zoo articles on deer, see…

Refs – –

Bro-Jørgsen, J. & Dabelsteen, T. 2008. Knee-clicks and visual traits indicate fighting ability in eland antelopes: multiple messages and back-up signals. BMC Biology 2008, 6: 47 doi:10.1186/1741-7007-6-47

Bubenik, G. A. & Bubenik, P. G. 2008. Palmated antlers of moose may serve as a parabolic reflector of sounds. European Journal of Wildlife Research 54, 533-535.

Charlton, B., Reby, D. & McComb, K. 2007. Female red deer prefer the roars of larger males.Biology Letters 3, 382-385.

Fitch, W. T. & Reby, D. 2001. The descended larynx is not uniquely human. Proceedings of the Royal Society of London B 268, 1669-1675.

Frey, R., Gebler, A., Fritsch, G., Nygrén, K., & Weissengruber, G. E. (2007). Nordic rattle – the hoarse phonation and the inflatable laryngeal air sac of reindeer (Rangifer tarandus)Journal of Anatomy, 210, 131-159

Geist, V. 1999. Deer of the World. Swan Hill Press, Shrewsbury.

Groves, C. 2005. The genus Cervus in eastern Eurasia. European Journal of Wildlife Research52, 14-22.

McCullough, D. R. 1969. The Tule Elk. Its History, Behavior and Ecology. University of California Press, Berkeley.

McElligott, A. G., Birrer, M. & Vannoni, E. 2006. Retraction of the mobile descended larynx during groaning enables fallow bucks (Dama dama) to lower their formant frequencies.Journal of Zoology 270, 340-345.

Pitra, C., Fickel, J., Meijaard, E. & Groves, C. 2004. Evolution and phylogeny of old world deer. Molecular Phylogenetics and Evolution 33, 880-895.

Reby, D., Charlton, B., Locatelli, Y. & McComb K. 2010. Oestrous red deer hinds prefer male roars with higher fundamental frequencies. Proceedings of the Royal Society of London B 277, 2747-2753.

Thomas, D. C. & Toweill, D. E. 1982. The Elk of North America; Ecology and Management. Stackpole Books, Harrisburg, PA.

Vannoni, E. & McElligott, A. G. 2008. Low frequency groans indicate larger and more dominant Fallow deer (Dama dama) males. PLoS ONE 3(9): e3113. doi:10.1371/journal.pone.0003113