Pashtun Community | Pashtuns | Pashto |
World's Largest Online Pashtun Community

Go Back   Pashtun Community | Pashtuns | Pashto | > Profession & Science > Science - پوهنه
Reload this Page Antarctic moss lives on ancient penguin poo
User Tag List

Reply
 
Thread Tools Display Modes
(#1)
Old
din din is offline
PF senior
din is on a distinguished road
 
Posts: 6,347
Thanks: 1,134
Thanked 936 Times in 697 Posts
My Mood: Happy
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Join Date: Apr 2010
Default Antarctic moss lives on ancient penguin poo - 07-05-2012, 04:37 AM

36 Share this page



Antarctic moss lives on ancient penguin poo

By Victoria Gill Science reporter, BBC Nature Antarctica's moss viewed from above
Continue reading the main story Related Stories


Moss plants that survive the freezing conditions of Antarctica have an unusual food source, scientists say.
The vibrant green plants take nutrients from the poo left behind by penguins that lived in the same area thousands of years ago.
Scientists made their discovery whilst testing the plants to find out how they manage to survive in the icy landscape.
The findings were presented at the Society for Experimental Biology's annual meeting in Salzburg, Austria.
Continue reading the main story Big chill


Ella Davies Reporter, BBC Nature
  • The cold, dry desert of Antarctica holds the record for the lowest temperatures on Earth
  • To cope with the cold plants dry to a crisp to protect themselves in winter, rehydrating again in the summer
  • Most mammals and birds choose only to visit for the relatively warmer summer months
  • Between October and February Adelie penguin pairs take turns to heat their eggs on nests constructed from stones

Prof Sharon Robinson, from the University of Wollongong in Australia, has been studying Antarctica's plants for 16 years.
She explained that she was interested in where the plants get their nutrients, because the Antarctic soil on which they grow is so poor.
"Plants need water, sunlight and nutrients; there's plenty of sunlight in the summer and as long as the ice melts there's water," she told BBC Nature.
"But the soil is basically sand and gravel."
To find out where the plants were getting the food they needed to grow, Prof Robinson and her team used a technique that allowed them to see all of the chemicals that made up a moss plant.
This "chemical signature" revealed nitrogen that had passed through a marine predator.
"Nitrogen that's gone through algae, krill and fish and then penguins has a characteristic 'seabird signature'," Prof Robinson told BBC Nature.
Since no penguins live on the elevated lakeside site in East Antarctica, the researchers had to work out where the mysterious seabird poo came from.
They realised that their moss beds were growing on the site of an ancient penguin colony.
"Between 3,000 and 8,000 years ago, on the site where the moss is now growing, there used to be [Adelie] penguins," said Prof Robinson.
"There's fossil evidence to support that, and the little pebbles that the penguins use to make their nests are actually still there.
"The other thing that's still there is the penguin poo.
Six different species of moss live on the islands of East Antarctica studied by the scientists
"And because Antarctica is so cold, those nutrients have just stayed frozen in the soil; they're now feeding this moss."
Prof Robinson said that the hardy plants, which grow just 2-3mm per year, create "luxuriant green beds" that are home to some of the insects and other miniature creatures that manage to live in this frozen desert.
Prof Robinson hopes to learn exactly how they adapt to this extreme environment.
The mosses are able to "freeze-dry" in order to survive the winter and produce sunscreen compounds to protect themselves from UV rays.
"It's amazing that the plants can do [these things], but it's also interesting to know which compounds they use," said Prof Robinson.
Learning the molecular mechanisms behind plants' abilities to dry out but remain viable could help researchers to develop ways to store food or even medicines for long periods.
Reply With Quote
Reply

Tags
ancient, antarctic, lives, moss, penguin, poo

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off




Learn Pashto Online| Afghan Wiki| TheHujra.com| Pukhtoogle| Afghanvoice.com| Khyber.org| Pukhto.net| Tor_Khan's blog| Abdul Rahman Karim's blog| Voices of the Pashtun land| Pashto TV

User Alert System provided by Advanced User Tagging v3.0.6 (Lite) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd. Runs best on HiVelocity Hosting.
No part of this site may be copied without permission of the administration. The views, posts, opinions and threads expressed by members of the community here are not necessarily those of the staff and management of Pashtun Forums.