Jwer. Do you think the Rotterdam gorilla trio will still go to China, even if there is to be no straight exchange for other animals?
Yes they are still going, a multimillion dollar enclosure is being build at Shanghai and they are promised. As far as i remember Rotterdam Zoo received multiple animals from Shanghai allready without a straight exchange back (takin's, white-lipped and tufted deer amongst others i believe).
Patrick- fair comment about the douc langurs and proboscis. They had Douc langurs at Cologne zoo the longest- maybe still have a few there, I can't remember. But in the long term both species have proved difficult to keep successfully in temperate situations.
Cologne still holds 1.3 Douc's but they are highly inbred and are expected to die out. Still i don't believe you can compare zoological situations with those 20 years ago. San Diego had problems with letting them thrive and they are in a relatively hot climate. I don't know what causes the problems with them in the western world, but it wouldn't suprise me if it's just inbreeding, which has nothing to do with the ability to keep them but only with the ability to obtain enough unrelated animals...
A zoo like Duisburg can import fresh eucalyptes for their koala's, so why would it be impossible to keep Douc's and import fresh leaves for them. If a zoo commits to these species, even in a moderate climate they should be able to be kept decently in my opinion anyways...
But considering the impossibility's of getting unrelated animals it might be better for zoo's to switch to golden monkey's who are prolific in captivity in China. But then the whole renting issue comes up and they would need to be kept under the chinese breeding program, because western zoo's can't start up their own without "owning" the animals. This doesn't mean that they can't contribute to their breeding program though, so even tho it isn't ideal it's not that bad...
In my opinion the only reasonable long term solution is to pick a relatively endangered species, of which enough unrelated founders can be obtained now or in the near future to set up a breeding program big enough to keep a good population in western zoo's. The annoying thing about that is that every zoo is going to keep the same species...
Small note on takin's: Europe currently holds three subspecies of takin's, Szechuan, Mishmi and golden takin's. We tried to trace their origins with some dutch zoo-followers and as far as we know all the Mishmi's in the western world (thus including USA) are from 2.1 founders in Berlin Tierpark so hugely inbred. The Szechuan are Rotterdam's original pair received from Shanghai and their offspring distributed over Europe, the male founder of Rotterdam died recently so any new offspring will be brother/sister. And the golden takin's are Liberec (czech republic) original pair and their offspring 2.1 who are at Chomutov (also CZ). Any new blood would help any of these subspecies...