Reindeer calving: Can we predict whether there will be more males or females born?

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It has been an exceptionally mild winter here in the Cairngorms; the ski season never really seemed to kick off, the herders are missing the snow and it has just felt a bit wetter and warmer than usual. I’m sure you’ve noticed how early the snowdrops and daffodils seem to have emerged and we have noticed that the hills are looking a bit greener with the heather and deer sedge starting to grow already. Looking at the Met Office summary for winter 2016-2017, temperatures are up about 3.0°C on average (average being data from 1981-2010) in the UK.

OLYMPUS DIGITAL CAMERA

This blog is really just an excuse to look at cute calves. Here’s a reindeer and a red deer calf, both being hand reared.

For the reindeer, this warming winter could have lots of effects, and we have recently heard of the reindeer in the Yamal peninsula, Siberia, starving to death due to increased rainfall in the autumn freezing and leaving a thick layer of ice impenetrable to them for foraging.

Our reindeer seem to be coping just fine and it has not frozen here enough for them not to reach their favourite food, lichen. However, research done by previous reindeer herder Heather Hanshaw has shown that weather conditions do definitely affect the proportion of male to female calves born in the spring. Since calving will soon be upon us, I thought it might interest you to know about this research and what our mild winter may mean for us in the upcoming weeks.

calf

Newborn calf

Heather studied Physical Geography at Edinburgh University and in her final year needed a project to study. Of course, having an interest in climate as well as reindeer, and having worked at the Reindeer Centre, a project about how climate affects them was a natural interest to Heather. She knew that Mr Utsi and Dr Lindgren had been very meticulous about the data kept on calves born in the Cairngorm herd, and climate data was easily enough accessed, so Heather devised a project determining if weather (temperature and rainfall) had any effect on the proportion of male to female reindeer calves born. A similar study was conducted with Red deer on the Isle of Rum, and their study found that milder winters led to more male calves. Would it be the same or opposite of Rum, or would weather have no effect on the Reindeer?

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The famous Fergus, asleep on Mel’s rug

It turns out that Reindeer are similar to Red deer and when the winter temperature increases, so does the proportion of male calves. So, will that turn out to be true this year? With only a few weeks until calving begins, it will be interesting to look at whether we have lots of male calves this year.

Last year the winter seemed fairly average, possibly on the warm side a little, and our calving ratio was almost perfectly 1 male to 1 female, so it will be really interesting to see if this mild winter has had an effect on what will be born this May.

Hopscotch and calf

Hopscotch and calf

Please find sources below.

http://www.metoffice.gov.uk/climate/uk/summaries/2017/winter

https://www.newscientist.com/article/2112958-80000-reindeer-have-starved-to-death-as-arctic-sea-ice-retreats/

http://www.nature.com/nature/journal/v399/n6735/abs/399459a0.html

Imogen

 

 

Reindeer, Roe or Red: How to recognise your British deer

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Although there are only seven species of deer living wild in the UK, there is often confusion as to which species people have seen, not helped by the fact that usually there is only a fleeting glimpse of a fast-moving rump disappearing into the trees! In this week’s blog, I hope to demystify the issue and perhaps raise your curiosity so you keep a closer look-out for your local deer. So from largest to smallest, here are the species to look out for…

Red deer (Cervus elaphus)
Height (shoulder): 110-150cm

Red deer

Red deer (Photo by Rexness used under CC 2.0)

Our largest species of deer, and in fact our largest land animal, is the red deer. Named for their beautiful reddish brown summer coats, red deer are native to the UK and are a herd animal preferring to live in woodland with open rides. However, as humans have altered the countryside over the centuries, they have adapted to living on moors and heaths, though the red deer of the Scottish highlands rarely grow as big as their cousins in the lowlands. Red deer are found across the UK, and are best recognised by the combination of their large size (they are big!), their buff rump and short tail. They’re also likely to be seen in herds rather than on their own.

Reindeer (Rangifer tarandus)
Height (shoulder): 100-140cm

Reindeer bull

Reindeer bull © Richard Cope

Reindeer are by far the most familiar deer species to me, because this is the species we care for here at the Centre. Reindeer were once found free-ranging across much of the UK, but died out due to the pressures of over-hunting and climate change at least 1000 years ago. Our small herd were reintroduced to the Cairngorms in Scotland in 1952, and around 150 reindeer now roam the mountains here. As the only British deer species to be adapted to Arctic conditions, they are comparatively stocky and dumpy, and tend to carry their heads below the horizontal. Their colour ranges from pure white to almost black – variation caused by thousands of years of domestication – and both males and females grow antlers. For most people, they are an easy candidate to rule out, as they are only found roaming in the Cairngorms in Scotland.

Sika deer (Cervus nippon)
Height (shoulder): 70-120cm

Sika deer

Sika deer (Photo by Arudhio used under CC 2.0)

Originally Japanese in origin, Sika deer were introduced to the UK from 1860, and can now be found in patches right across the country, though their stronghold is in north-west Scotland. They are similar in appearance to a red deer at first glance, but are slightly smaller, have a dark dorsal stripe and a much darker brown winter coat. Their heart-shaped rump patch is bright white, compared to the buff colour of a red deer, and for much of the year they are solitary, though they will form small groups of 6-7 in the autumn and winter.

Fallow deer (Dama dama)
Height (shoulder): 70-100cm

Fallow

Fallow deer buck (Photo by Not From Utrecht used under CC 3.0)

The stereotypical “spotty” deer, fallow deer are a common sight grazing in the grounds of stately homes and parkland. There is evidence that fallow once roamed Britain around 400,000 years ago, but today’s population has resulted from escapees from parks. Fallow bucks grow lovely ‘palmate’ (flattened) antlers. The familiar tan “menil” form with white spots is just one of the colours that this variable deer comes in, whilst some individuals are white, some are dark brown with spots that disappear in winter, and some are completely black. The noticeable trait which is the same for all of these colourations is a light coloured rump patch edged with black, with their long tail appearing to split it into two.

Roe deer (Capreolus capreolus)
Height (shoulder): 65-75cm

Roe deer

Roe deer (Photo by JoJo used under CC 3.0)

The dainty roe deer is another of our native deer species, and perhaps the one you are most likely to spot in woodland and gardens right across the UK, with some individuals becoming incredibly tame due to living in close proximity to humans. The species was driven close to extinction in this country in the 1700s due to overhunting. Roe deer are usually seen alone or in small family groups, are a solid brown colour with a small rump patch and don’t have a noticeable tail. They will ‘bark’ if alarmed, which can be mistaken for the yap of a dog.

Chinese water deer (Hydropotes inermis)
Height (shoulder): 50-60cm

Chinese water deer

Chinese water deer (Photo by Nicholls of the Yard used under CC 2.0)

Chinese water deer are a primitive species – instead of growing antlers the males grow tusks which can be seen protruding from their mouths. They were introduced to the UK within the last 150 years and have since become established across the Midlands and East Anglia. As their name suggests, their preferred habitat is fens and wetlands, and they are usually seen alone or in small family groups as they are territorial. The most obvious differences setting Chinese water deer apart are the lack of antlers, large mobile ears and the absence of a rump patch.

Muntjac deer (Muntiacus reevesi)
Height (shoulder): 45-55cm

Muntjac

Muntjac deer (Photo by Nilfanion used under CC 3.0)

The smallest of our deer species was introduced around 1900, and is now well established across most of England. At first glance, it would be easy to mistake a Muntjac for a small dog, or perhaps a large hare, as they tend to have a peculiar hunched stance. Muntjac are usually seen alone or in small family groups, and the males are often heard rather than seen as they bark persistently when rutting. Along with the male’s small antlers, both sexes grow tusks, and as they aren’t seasonal breeders, does can be seen with a fawn at any point of the year. Their tiny stature (think collie-dog size) and hunched posture makes Muntjac easy to distinguish.

So there it is, from the largest to the smallest, the seven species of deer that you may encounter in the UK. Hopefully this has helped make the thought of working out who that disappearing rump belonged to a little less daunting! Keep your eyes open, even in parks and gardens in towns and cities, and perhaps you may be surprised by one of these beautiful animals.

Andi