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 Post subject: Re: The Mystery behind the sable and roan decline in KNP
Unread postPosted: Mon Jul 26, 2010 9:14 pm 
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Richprins wrote:
4. Roan are apparently extremely susceptible to Anthrax, and during the 80's were subjected to annual immunisation carried out via darts fired from helicopters, a practice which was later questioned as being very stressful on the herds...rather understandably...and possibly contributed to their sudden decline soon after.?


Very interesting RP. My late father, a state vet, spoke about this a lot many years ago. My understanding about this is as follows.

During the immunisation process, carried out via darts fired from helicopters, animals like roan and sable were stressed to the limit and to such an extend that they suffer from Vlekspier or Capture Myopathy. What happens is that when these animals are chased around by helicopter the metabolism in their muscles changes from using oxygen to using stored energy which leads to the build up of lactic acid which in turn drops the ph in the body. The heart is affected and the muscle starts to die due to the releasing of myoglobin which is a breakdown product of muscle.

Myoglobin damages the kidney, liver and the lungs start to bleed. In short the kidneys and liver cannot process the toxins and this is fatal to the animal. They actually ran themselves to death.

I may be wrong with certain facts and it would be great to have a vet here to advice on this issue.

(Source: http://www.fourthcrossingwildlife.com/C ... Fowler.pdf" onclick="window.open(this.href);return false;" onclick="window.open(this.href);return false; )


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 Post subject: Re: The Mystery behind the sable and roan decline in KNP
Unread postPosted: Tue Jul 27, 2010 7:53 pm 
Your post is 100% correct, TheunsH, as far as I know! :thumbs_up:

Except only roan were immunised, not sable.

Welcome, Sable 2!

Don't know of sable programmes at Skukuza...probably just a normal herd, depending on the time period.

Sable were also kept at the rare antelope camp at Pretoriuskop, some of which were "reintroduced" to the far north in one project, which is under the "Sable" thread.

I must stress that I am not a scientist, rather someone who has been fortunate enough to visit Kruger many times over the period concerned! :)


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 Post subject: Re: The Mystery behind the sable and roan decline in KNP
Unread postPosted: Wed Jul 28, 2010 12:10 pm 
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Richprins wrote:
Except only roan were immunised, not sable.

RP. :thumbs_up: :thumbs_up:


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 Post subject: Re: The Mystery behind the sable and roan decline in KNP
Unread postPosted: Thu Aug 12, 2010 3:44 pm 
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I have read a artical (can't remember where) that stated the main reason for the decline in the numbers was due to the fact that the sable's babies are being born in the winter and they hide them until they are a bit stronger. Due to the fact that there were now waterholes in areas that are usually dry because they don't need a lot of water and more animals expecially lions there was a sharp drop in their growth rate.That was the main reason why they closed some waterpoints.


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 Post subject: Re: The Mystery behind the sable and roan decline in KNP
Unread postPosted: Thu Aug 12, 2010 7:23 pm 
Welcome, estellem! :clap:

That sounds about right, although the calving could possibly be late winter or later! :thumbs_up:


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 Post subject: Re: The Mystery behind the sable and roan decline in KNP
Unread postPosted: Fri Aug 13, 2010 10:36 am 
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Thanks Odessy for a most interesting read and fascinating information!! :D

We've seen Sable only on rare occasions - there was a cam sighting of a Sable at the Satara Cam last year. Just can't remember who posted it!! :roll:

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 Post subject: Re: The Mystery behind the sable and roan decline in KNP
Unread postPosted: Fri Oct 15, 2010 12:02 pm 
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The sable In the Pretoriuskop Region:

Thought some forumites might find this interesting. I explained the rationale behind the decline in sable in the north but those ideas do not hold for the herds found within the south, so why have the number of herds of sable declined from a recorded >20 in 1977 to only 4 now??

Pretoriuskop receives over 700mm of rain every year and as such when artificial waterpoints were installed very, few were setup in this area because of the greater moisture availability, so the waterpoints could not be the reason for their decline in that area.

Between 2006 and 2009 the 4 herds in the pretoriuskop area were tracked and studied. They looked at food resources, as well as aspects of topography and vegetation that influence resources.

In 2008 the Carnegie Airborne Observatory conducted hyperspectral imaging and LiDAR (light detection and ranging) flights over the areas of the current home ranges and historicsal home ranges of the sable and provided this Raw data to the scientists. This data provided a 3-dimensional map projection and measured vegetation structure, composition and chemistry , really impressive technology!. other data collected included phenology, greeness, height, feeding vs non-feeding site etc.

It was found that sable show a significant preference for areas of intermediate to high tree canopy cover while they show some avoidance for areas dominated by shrub cover. They avoid bottomland areas (which basically means that they avoid river channels and the lower slopes of a catenal profile). The data also showed that there is a significant influnce of termite mounds (if you look at a large scale, large area) in the home ranges occupied by the herds.

BUT

There is also no significant difference between current home ranges and historical home ranges which suggests that more factors need to be considered before we can understand the decline of the sable population in southern kruger. Although ; the findings do show that the habitat is suitable for sable.

so not by any means a definitive answer but the centre for African Ecology seems intent on finding out the reasons for their decline :thumbs_up:

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 Post subject: Re: The Mystery behind the sable and roan decline in KNP
Unread postPosted: Fri Oct 15, 2010 8:28 pm 
Nice, oddesy! :thumbs_up:

Can add that over the period mentioned lion became far more regular visitors to Pretoriuskop, as well as Elephant! :shock:

And an extended wet rainfall cycle since 1997!

Wouldn't worry too much about sable disappearing there... :wink:


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