Actually, White/Blonde/Pale Lions have been found in Kaokoland, Botswana, Umfolozi and Kruger, as well as Timbavati. And some recent research I heard about suggests that a pride of white lions maybe better hunters than normal lions. The white colour does not disadvantage them as they tend to hunt in sandy areas (near rivers) where normal tawny lions are obvious.
A view promoted, as far as I can tell, by the Global White Lion Protection Trust, perhaps not the most reliable of sources. By the way, the GWLPT do say on their website that white lions have been "extinct" in the wild since 1994. Perhaps a decline in sandy habitats?
Are you suggesting normal coloured lions in Australia have considerably more conservation value?
The conservation value of lions in Australia rather depends on how taxonomists end up classifying lions. But a population bred to maintain maximum genetic diversity is always going to be of more conservation value than one inbred to establish a recessive mutation.
The gene appears in the wild, and although it has a low frequency it is not extremely rare in this population (as attested by the number of white animals being born in the wild).
I understood that it was exceedingly rare, and the GWLPT says they haven't existed in the wild since 1994.
Therefore, the gene needs to be conserved.
Why? And especially why at the expense of all the other rare alleles that would be bred out of the animals as you selectively breed for the white allele. Maybe an allele that could help them combat feline AIDS or one that will help lions adapt to climate change. But heck none of those can be as important as a pretty white coat.
It's possible this is the beggining of an evolutionary radiation within the species,
Highly speculative, and pretty much at odds with everything we know about genetics and evolution.
which we are interfering with - the current selection pressure upon this gene appears to be Homo sapiens.
Finally a statement I can agree with. We are putting pressure, promoting the allele by selectively breeding for it. And guess who turns out to be the major breeders of white lions? Operators of canned hunts in South Africa. Which pretty much sums it all up, I would think.