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 Post subject: Risk of hybridisation of mammals in national parks.
Unread postPosted: Sun Dec 22, 2013 6:33 pm 
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Junior Virtual Ranger
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Location: Body:Pretoria ; Soul:Kruger
Yesterday I posted a topic on what I was sure to be a hybrid Plain's Zebra/Mountain Zebra that I found in Mountain Zebra National Park. This morning I asked one of the local guides about it and he confirmed that he has seen such animals. He however said that they are infertile. Is there a scientist on the forum that can confirm this?

Today we travelled to Mokala National Park and my sightings there raised some more questions on this topic. I found that there are both Black- and Blue Wildebeest in the reserve. I am sure I have heard that these 2 species can produce fertile offspring so is it not a risk to put these together in a relatively small reserve?

Another one I query is Tsessebe and Red Hartebeest. Both of them are also found in Mokala. Can't they produce fertile offspring?

It would be interesting to get a response from a Sanparks official on the reasons for keeping some of these closely related species together in national parks if there might be risks of fertile cross-breeding.

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 Post subject: Re: Risk of hybridisation of mammals in national parks.
Unread postPosted: Thu Dec 26, 2013 6:30 am 
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Legendary Virtual Ranger
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An aerial photograph of a Zonkey taken at Mapungubwe.

viewtopic.php?f=42&t=6759

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 Post subject: Re: Risk of hybridisation of mammals in national parks.
Unread postPosted: Fri Dec 27, 2013 9:48 am 
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Senior Virtual Ranger
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We expressed concern about Zonkeys in Golden Gate National Park last year....


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 Post subject: Re: Risk of hybridisation of mammals in national parks.
Unread postPosted: Fri Dec 27, 2013 11:25 am 
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Distinguished Virtual Ranger
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Hi Ifubesi,

Lesego is off on a very well deserved break so please hold on till the New Year? I'm sure she'll attempt to get a reply then. :)

As a matter of interest, I watched a program on TV a few days ago, about the possibility of a mule being able to reproduce. They said it is highly unlikely, they are not sterile as such, just the chromosomes don't match up.
Pretty much like this explanation I found here.
Quote:
Q: Can Cape mountain zebra and plains zebra be kept together?

Yes they can, if the population size of each species is big enough. Hybridization is more likely to occur in small populations with low mate availability and skewed sex ratios. This is the case for a number of cmz populations, yet there are no known cases of hybridization. Fertile hybrids are also unlikely, as the difference in the number of chromosomal pairs between the two species is relatively large (44 versus 32 in plains zebra and Cape mountain zebra).

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 Post subject: Re: Risk of hybridisation of mammals in national parks.
Unread postPosted: Fri Dec 27, 2013 8:50 pm 
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Junior Virtual Ranger
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Location: Kyalami, South Africa.
I also thought you couldn't have Blue and Black Wildebeest together. Last year I was at a fairly small (not SANParks) game reserve where they had both. I asked the manager about it and he said they had done studies and the two species would keep apart if they had enough space and enough of their own type and not inter-breed.

As far as I know, mules (horse x donkey cross) are infertile.

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 Post subject: Re: Risk of hybridisation of mammals in national parks.
Unread postPosted: Fri Dec 27, 2013 11:52 pm 
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Virtual Ranger
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Hi Ifubesi, as a biologist I could try to explain at little but it would get long winded and clumsy; this Wikipedia article is a good basic primer:

http://en.wikipedia.org/wiki/Sympatric

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 Post subject: Re: Risk of hybridisation of mammals in national parks.
Unread postPosted: Tue Mar 18, 2014 9:44 pm 
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Joined: Sun Jan 19, 2014 10:04 pm
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Location: Pretoria
At another place (Not SanParks) we used to visit all the black wildebeest had to be removed as they had started cross breeding with the blue's.

I am not sure of the tsessebe X red hartebeest, but I know there have been cases of blesbuck and red hartebeest cross breeding and (supposedly) the offspring are then infertile.

Although I believe Kruger won't experience this as space is plenty!

And a really scary one - a 75% roan and 25% (giant) sable in Angola - meaning it has been cross bred and the hybrid bred again with another roan. http://angolafieldgroup.com/palanca-negra/img_0093/

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