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ON THE EDGE OF EXTINCTION - A - THE TIGER (Panthera tigris)

India Rishi Offline
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( This post was last modified: 03-22-2019, 10:40 AM by Rishi )

(03-22-2019, 09:39 AM)GuateGojira Wrote: By the way, did somebody have this document of 2018 in PDF? I can't found it in the web by free. Crying

I requested full text on ResearchGate for the study (Genome-Wide Evolutionary Analysis of Natural History and Adaptation in the World’s Tigers). Waiting...

I have soft-deleted the past for a little bit. 
It's good enough to be the first independent article on the new Premier Section if you permit.

@sanjay @peter @tigerluver post number #2,144. Please respond.
"Everything not saved will be lost."

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India sanjay Offline
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I confirm.
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United States paul cooper Offline
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( This post was last modified: 03-22-2019, 11:29 AM by Rishi )

CBC news video about that male siberian tiger, tikon, that came to humans for help a few months ago.




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India Rishi Offline
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( This post was last modified: 03-22-2019, 11:54 AM by Rishi )

@GuateGojira are you willing to include comparison with lions in this topic (name of the thread will depend on that)? 
In that case i plan on writing a follow-up post on how the lion subspecies being grouped into two could be a comparable case...

(03-22-2019, 10:40 AM)sanjay Wrote: I confirm.

After a name is decided you create the thread & how about you move the post there with in the blog-style you have in mind. One example from you will make future ones easier.
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Netherlands peter Offline
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( This post was last modified: 03-22-2019, 12:21 PM by peter )

(03-22-2019, 10:29 AM)Rishi Wrote:
(03-22-2019, 09:39 AM)GuateGojira Wrote: By the way, did somebody have this document of 2018 in PDF? I can't found it in the web by free. Crying

I requested full text on ResearchGate for the study (Genome-Wide Evolutionary Analysis of Natural History and Adaptation in the World’s Tigers). Waiting...

I have soft-deleted the past for a little bit. 
It's good enough to be the first independent article on the new Premier Section if you permit.

@sanjay @peter @tigerluver post number #2,144. Please respond.

First things first. I'm waiting for a response on the questions asked in post 2,135, that is.
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India Sanju Offline
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(03-22-2019, 11:06 AM)paul cooper Wrote: CBC news video about that male siberian tiger, tikon, that came to humans for help a few months ago.




#25
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India Sanju Offline
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( This post was last modified: 03-22-2019, 06:38 PM by Sanju )

@GrizzlyClaws 

From which subspecies "sondaica" (formerly, balica; sondaica and sumatrae) subspecies evolved? modern south china/Pleistocene sunda spp/both spp through hybridisation?

I think, after Toba eruption South China Tigers (ancestor of remaining subspecies and most ancient of all along with indochinese "corbetti") from Wanhsien tiger (antique tiger or acutidens) remaining small founder population, the only population of tigers left spread across mainland and sunda (when it is together with asia during ice age glacial maximum).


*This image is copyright of its original author


*This image is copyright of its original author

PDF

But, I read some where in forum and wiki of oxygnatha that Ngandong (oxygnatha or trinil?) tiger is also the ancestor of sunda tigers? HOW? Through hybridization with south china??

I strongly believe in 2 subspecies (tigris and sondaica) modern tiger spp idea. They may have local traits and adaptation particular to regions (could be due to disruption in connectivity of their sub populations due to humans since 1,00,000 yrs could be also a reason for some differences in formerly wrongly alleged spps as "9") but little local traits and characteristics differences are not enough to consider as spps.

and I also support Amur Reintroduction to Hyrcan region.

Attached Files
.pdf   Copy of Translated copy of Король джунглей. Эволюция тигра.pdf (Size: 689.43 KB / Downloads: 4)
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India Rishi Offline
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(03-22-2019, 04:35 PM)Sanju Wrote: I strongly believe in 2 subspecies (tigris and sondaica) modern tiger spp idea. They may have local traits and adaptation particular to regions (could be due to disruption in connectivity of their sub populations due to humans since 1,00,000 yrs could be also a reason for some differences in formerly wrongly alleged spps as "9")

and I also support Amur Reintroduction to Hyrcan region.

Please don't... Men (& women) of science mustn't "believe".

Quote:...but little traits and characteristics differences are not enough to consider as spps.

How so? The new study, isn't made free for public!

https://www.researchgate.net/publication...d's_Tigers
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India Sanju Offline
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( This post was last modified: 03-23-2019, 08:58 AM by Sanju )

(03-22-2019, 06:11 PM)Rishi Wrote: Please don't... Men (& women) of science mustn't "believe".
Actually, I agree and "support" that taxonomical (classification) haplotype cladistics and phylogeny systematics of Cat Classification Task Force (CCTF) of IUCN Cat Specialist Group.


(03-22-2019, 06:11 PM)Rishi Wrote: How so?
I'll stick to this and sounds more realistic and scientifical:

https://repository.si.edu/bitstream/hand...sAllowed=y

And I agree more with classification which is given more importance (relatively) genotypical or molecular mtDNA comparative analysis and microsatellite diversity based (genetical) than phenotypical based (morphological) which deals with anatomical and structural aspects and features as well as behavioral characteristics.

Subspecies differentiation in the tiger would have resulted from geographical isolation, genetic drift and local adaptation associated with repeated restriction and expansion of habitats in the last 100,000 years "only", Climate and humans can be some of the reasons behind. In this short time, evolution of 9 subspecies and coining them as spp according to geographical names or adaptations and modifications is pretty far fetched.

Since, 2 million years to 0.1 million yrs of true tiger evolution only, only about 4 Pleistocene tigris spp are occurred at maximum but now from single ancestor, evolution of 9 spp clades in just 1,00,000 yrs is ambiguous.

And I agree with 2 spp classification of lion too.
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India Sanju Offline
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(03-22-2019, 06:11 PM)Rishi Wrote: The new study, isn't made free for public!

I hope and expect @tigerluver to help. Grin
When Need turns to Greed, our Extinction happens.
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Canada GrizzlyClaws Offline
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(03-22-2019, 04:35 PM)Sanju Wrote: @GrizzlyClaws 

From which subspecies "sondaica" (formerly, balica; sondaica and sumatrae) subspecies evolved? modern south china/Pleistocene sunda spp/both spp through hybridisation?

I think, after Toba eruption South China Tigers (ancestor of remaining subspecies and most ancient of all along with indochinese "corbetti")  from Wanhsien tiger (antique tiger or acutidens) remaining small founder population, the only population of tigers left spread across mainland and sunda (when it is together with asia during ice age glacial maximum).


*This image is copyright of its original author


*This image is copyright of its original author

PDF

But, I read some where in forum and wiki of oxygnatha that Ngandong (oxygnatha or trinil?) tiger is also the ancestor of sunda tigers? HOW? Through hybridization with south china??

I strongly believe in 2 subspecies (tigris and sondaica) modern tiger spp idea. They may have local traits and adaptation particular to regions (could be due to disruption in connectivity of their sub populations due to humans since 1,00,000 yrs could be also a reason for some differences in formerly wrongly alleged spps as "9") but little local traits and characteristics differences are not enough to consider as spps.

and I also support Amur Reintroduction to Hyrcan region.


Javan tiger: pure biological descendant of the Ngandong tiger, but exposed to the insular dwarfism

Bali tige: pure biological descendant of the Ngandong tiger, but also exposed to the insular dwarfism

Sumatran tiger: mixed descendant of the Ngandong tiger and the post-eruption mainland tiger (Wanhsien tiger) population


That's the likely theory for the evolutionary lineage for the modern Sunda tiger.

However, the genetic study that is quite certain that the modern Sunda tiger also shared a common ancestor with the modern Mainland tiger as recent as 75 kya, then the aforementioned graphs were likely accurate about the whole context.
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Canada GrizzlyClaws Offline
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(03-22-2019, 07:33 PM)Sanju Wrote:
(03-22-2019, 06:11 PM)Rishi Wrote: The new study, isn't made free for public!

I hope and expect @tigerluver to help. Grin

tigerluver's fossil was only 20,000 years old, but these tigers were still giants that comparable to the largest Cave lion.

Not sure if they were already the modern Mainland tigers or the Wanhsien tigers in its late stage, or maybe a transitional phase in between, like the "P. tigris sp" mentioned in the chart.
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United States tigerluver Offline
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No time to catch up on the conversation just yet but here is that paper (I think I've posted it before).

Attached Files
.pdf   liu2018.pdf (Size: 2.54 MB / Downloads: 15)
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Canada GrizzlyClaws Offline
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( This post was last modified: 03-23-2019, 02:26 AM by GrizzlyClaws )

The new paper has demonstrated that the Amur tiger being autosomally closer to the South China tiger, but also emphasizing its genetic affinity with the Caspian tiger.

Maybe the back migrated Caspian tiger used to procreate with the remaining Wanhsien tiger population.

The more robust Amur tigers from Manchuria might have leaning more toward the parental side of the Wanhsien tiger, while other populations inherited more from the Caspian tiger.
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India Sanju Offline
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( This post was last modified: 03-23-2019, 09:24 AM by Sanju )

(03-23-2019, 02:23 AM)GrizzlyClaws Wrote: The more robust Amur tigers from Manchuria might have leaning more toward the parental side of the Wanhsien tiger, while other populations inherited more from the Caspian tiger.

I think, independent of the amur subpopulation region, the reason might be selective demolishing of large tiger specimen genes from population through trophy hunting or poaching and natural selection pressure towards smaller tigers (even it is colder climate) because of low concentration and less diversity prey items and inability of smaller prey to sustain big tigers metabolism like in early holocene.

But now, as through conservation prey base are boosting in some areas, there the robust specimens are making a comeback again as it is important for mass and volume to be more in cool boreal forests for better survival and this more prey is becoming adequate to large tigers unlike before.

and Yeah, there, wanhsien genes are revealing like in Manchuria.

*This image is copyright of its original author

*This image is copyright of its original author

(He is most widespread and successful spp than conspecies and evolutionary equivalent or sympatric one in sunda i.e.., "trinil tiger")

Thanks! @tigerluver
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