Featured Research

from universities, journals, and other organizations

Scientists discover evidence of giant panda's population history and local adaptation

Date:
December 16, 2012
Source:
BGI Shenzhen
Summary:
A research team has successfully reconstructed the history of the giant panda from its origin to the present.

Hungry giant panda bear eating bamboo.
Credit: wusuowei / Fotolia

A research team, led by Institute of Zoology of Chinese Academy of Sciences and BGI, has successfully reconstructed a continuous population history of the giant panda from its origin to the present. The findings suggested whereas global changes in climate were the primary drivers in panda population fluctuation for millions of years, human activities were likely to underlie recent population divergence and serious decline.

The latest study was published online in Nature Genetics.

The giant panda is the rarest member of the bear family. Sometimes considered the ambassador for all endangered species, it is a well-recognized symbol of international wildlife conservation. The giant panda is currently threatened by continued habitat loss, human persecution, and other threats. Its dietary specialization, habitat isolation, and reproductive constraints have led to a perception that this is a species at an "evolutionary dead end," destined for deterministic extinction in the modern world.

In this study, researchers carried out whole genome resequencing of 34 wild giant pandas and found the current six geographic populations of giant panda could be divided into three genetic populations, including Qinling (QIN), Minshan (MIN) and Qionglai-Daxiangling-Xiaoxiangling-Liangshan (QXL). Through reconstructing giant panda's population history, they found several important evolutionary events such as two population expansions, two bottlenecks and two population divergences.

The giant panda has a very specific diet, namely bamboo, while its ancestor was omnivorous or carnivores. As early as about 3 Myr ago, they probably had already completed their dietary shift and the pygmy panda emerged with bamboo as its primary diet. The warm and wet weather at that time provided ideal conditions for the spread of bamboo forests that further led to the first population expansion of giant panda. However, about 0.7 Myr ago, the panda population began to decline due to the two largest Pleistocene glaciations occurring in China, and its first population bottleneck occurred at about 0.3 Myr ago. During that period, pygmy panda was gradually replaced by another subspecies -- baconi panda that has larger body size.

After the retreat of the Penultimate Glaciations, giant panda's second population expansion happened and it reached its population peak between 30~50 thousand years (kyr) ago. The warm weather in the Greatest Lake Period (30~40 kyr ago) and alpine conifer forest may play an important role in the flourishing of the panda population. However, during the period of last glacial maximum (LGM), the climate was cold, dry, and inhospitable with frequent storms and a dust-laden atmosphere. Under such harsh environment, extensive panda habitats were loss and its second population bottleneck occurred.

The more recent panda population history showed that the panda population separated into Qinling (QIN) and non-QIN populations at about 0.3Myr ago, and then the non-QIN cluster diverged into two populations, the Minshan (MIN) and Qionglai-Daxiangling-Xiaoxiangling-Liangshan (QXL) at about 2.8 KYA ago. Subsequently, the three populations were different in the ways of fluctuation. For example, there was a drastic decline in the QIN, a slight increase in the MIN and a more remarkable growth in the QXL populations.

Researchers identified the signals of panda's local adaptation. They found the largest group of selected genes in these populations was related to sensory system. However, the two genes, Tas2r49 and Tas2r3, were associated with bitter taste and were under directional selection between the QIN and non-QIN populations, showing no signal of directional selection between MIN and QXL populations.

As a form of olfactory communication, odor perception is crucial for reproduction and survival of giant pandas in the dense forest. Researchers found the MIN and QXL populations had fewer directionally selected genes than QIN and non-QIN, suggesting less variation happens in the selection processes between MIN and QXL. They also found the evidence that population fluctuations were driven by global climate shifts, but recent human activities have likely caused population divergence and the serious recent decline.

Shancen Zhao, Project Manager from BGI, said, "We have identified three genetic populations of giant panda for the current six geographic populations lived in western of China. The varied local adaptations found in our study provide invaluable resource for researchers to better select effective conservation methods to rescue the giant panda even other endangered species. The translocation of wild-caught individuals or releasing the captive-bred ones may be a feasible approach. "


Story Source:

The above story is based on materials provided by BGI Shenzhen. Note: Materials may be edited for content and length.


Journal Reference:

  1. Shancen Zhao, Pingping Zheng, Shanshan Dong, Xiangjiang Zhan, Qi Wu, Xiaosen Guo, Yibo Hu, Weiming He, Shanning Zhang, Wei Fan, Lifeng Zhu, Dong Li, Xuemei Zhang, Quan Chen, Hemin Zhang, Zhihe Zhang, Xuelin Jin, Jinguo Zhang, Huanming Yang, Jian Wang, Jun Wang & Fuwen Wei. Whole-genome sequencing of giant pandas provides insights into demographic history and local adaptation. Nature Genetics, 2012; DOI: 10.1038/ng.2494

Cite This Page:

BGI Shenzhen. "Scientists discover evidence of giant panda's population history and local adaptation." ScienceDaily. ScienceDaily, 16 December 2012. <www.sciencedaily.com/releases/2012/12/121216132511.htm>.
BGI Shenzhen. (2012, December 16). Scientists discover evidence of giant panda's population history and local adaptation. ScienceDaily. Retrieved July 24, 2014 from www.sciencedaily.com/releases/2012/12/121216132511.htm
BGI Shenzhen. "Scientists discover evidence of giant panda's population history and local adaptation." ScienceDaily. www.sciencedaily.com/releases/2012/12/121216132511.htm (accessed July 24, 2014).

Share This




More Plants & Animals News

Thursday, July 24, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Dogs Appear To Become Jealous Of Owners' Attention

Dogs Appear To Become Jealous Of Owners' Attention

Newsy (July 23, 2014) A U.C. San Diego researcher says jealousy isn't just a human trait, and dogs aren't the best at sharing the attention of humans with other dogs. Video provided by Newsy
Powered by NewsLook.com
Professor Creates Site Revealing Where People's Cats Live

Professor Creates Site Revealing Where People's Cats Live

Newsy (July 23, 2014) ​It's called I Know Where Your Cat Lives, and you can keep hitting the "Random Cat" button to find more real cats all over the world. Video provided by Newsy
Powered by NewsLook.com
Stone Fruit Listeria Scare Causes Sweeping Recall

Stone Fruit Listeria Scare Causes Sweeping Recall

Newsy (July 22, 2014) The Wawona Packing Company has issued a voluntary recall on the stone fruit it distributes due to a possible Listeria outbreak. Video provided by Newsy
Powered by NewsLook.com
Michigan Plant's Goal: Flower and Die

Michigan Plant's Goal: Flower and Die

AP (July 22, 2014) An 80-year-old agave plant, which is blooming for the first and only time at a University of Michigan conservatory, will die when it's done (July 22) Video provided by AP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins