Hello everyone,
@ Peter: Yes, I will com to that list in a moment…
But firstly, I would like to show you some more developpments:
We have seen that some species have been breeded very often in high quantiities and are therefore really abundant. Others are not well distributed and therefore likely to disappear again. In the Graph beow, I present the developpments of the 16 most abundant species compared to the 42 further species.
I think it shows nicely how much the population sizes can vary throughout the years. Filamentosus and also harvey “Selangor” used to be reported in rather big quantities. Others have happily improved.
I want to go on and focus a bit on the unequality we find in the pair-distribution:
I took this graph exactly as I had put it into my paper so theres some writing in german on it… It shows the exact-percentage distribution of the Pairs that were reported in April 2015 on the different species. It is easy to see that this distribution is extremely unequal. The most common species; P. quindecim is hugely overrepresented: about one in four of all the reported pairs were of this species!
But it goes on: the four most abundant species: quindecim, linkei, bintan, and phoenicurus from Aq. Dietzenbach added up to more than half of all the reported pairs! The 32 other species and varieties shared the other half.
Now I want to move towards what Peter suggested:
We want to know exactly how many and which species are endangered the most:
This is the developpment. I grouped the Species into 4 cathegories. On the top, I put those that are the least endangered. 21 or more pairs of these specias have been reported. Then we have the relatively safe species that are rather abundant in the census with 9-20 pairs.
The third row shows the species and varieties we have to focus on the most. Of these many species, we have currently 4 up to 8 pairs wich is not so much. They face the real danger of dieing out within a few years. Therefore, these species must be observed and bred as intensively as possible. Currently, we have 10 such species:
[b]alfredi “Sedili”
anjuganensis ct.
cf. Filamentosus spec. “Ampah”
spec.aff. Linkei “Pankalanbun”
cf. Nagyi “Cherating”
pahuensis ct.
parvulus “Tankiling”
sumatranus ct.
tweediei “Pekan Nenas”
tweediei ct.
[/b]
Then we come to the 9 species that might very well face extinction soon. Thea are only represented by 1-3 pairs:
[b]allani “Sibu”
spec. aff. Bintan “Dua”
spec. Aff. Bintan “Sungai Bertam” ct.
gunawani (Danau Rasau)
harveyi ct.
opallios ct.
paludicola “Paka”
spec. Aff. Rubrimontis ct. Mimbon 2008
tweediei “Sri Bunian”
sp. “Parenggean”[/b]
In the past, the vast majority of all species that have disappeared used to belon to the 3rd group usually at least a year before they disappeared and most of them then showed up again in the 1-3 pairs in the census right before they disappeared.
I want to ask everybody of you wo has one of the 19 above-mentioned pairs in his or her stock to focus even more on these species and make sure they will become better available soon.
Of course, In some cases, this might already be too late but hopefully, some can be saved!