Earth Wobbling Linked To Extinctions - KLTV.com - Tyler, Longview, Jacksonville |ETX News

10/12/06

Earth Wobbling Linked To Extinctions

Scientists have linked the Earth's orbit and tilt to the extinction of mammals. Scientists have linked the Earth's orbit and tilt to the extinction of mammals.

LONDON, England (Reuters) -- Wobbles or variations in the Earth's orbit and tilt are associated with extinctions of rodent and mammalian species, Dutch scientists said on Wednesday.

They studied rodent fossil records in central Spain dating back 22 million years and found that the rise and fall of mammal species was linked to changes in the Earth's behavior which caused cooling periods.

"Extinctions in rodent species occur in pulses which are spaced by intervals controlled by astronomical variations and their effects on climate change," Dr Jan van Dam, of the Utrecht University in the Netherlands, said.

The researchers found two cycles corresponding to the disappearance of rodent species. One lasts 2.4 million years and is linked to variations in the Earth's orbit. The other is a 1.2 million year cycle relating to shifts in the tilt on the Earth on its axis.

The cycles are associated with lower temperatures, changes in precipitation, habitats, vegetation and food availability which are the main factors influencing the extinction peaks, the study published in the journal Nature said.

"Rodents are very sensitive to seasonal changes because they have such a short lifespan," said Van Dam, adding that they represent one of the best mammal fossil records.

At the moment, the Earth is at the beginning of a cycle but the planet's climate system has changed so much in the past 3 million years that it is difficult to predict what will happen in the future.

"The environment is responsible to what happens to species," said Van Dam. "Biological factors are secondary, according to our results."

Copyright 2006 Reuters. All rights reserved.This material may not be published, broadcast, rewritten, or redistributed.

  • NewsMore>>

  • Firefighters help angel tree kids

    Firefighters help angel tree kids

    Saturday, December 16 2017 11:51 PM EST2017-12-17 04:51:23 GMT

    East Texas firefighters come to the rescue of angel tree kids. Big Sandy firefighters held two fund-raisers over the past week to help their local Angel Tree network. They collected enough donations to buy toys for 28 kids through the local group 'Agape House Ministries Angel Tree' coordinators. Volunteers also collected cash donations which they turned over to Agape ministries. Copyright 2017 KLTV. All rights reserved.

    More >>

    East Texas firefighters come to the rescue of angel tree kids. Big Sandy firefighters held two fund-raisers over the past week to help their local Angel Tree network. They collected enough donations to buy toys for 28 kids through the local group 'Agape House Ministries Angel Tree' coordinators. Volunteers also collected cash donations which they turned over to Agape ministries. Copyright 2017 KLTV. All rights reserved.

    More >>
  • Big Sandy uses burn house for training

    Big Sandy uses burn house for training

    Saturday, December 16 2017 11:43 PM EST2017-12-17 04:43:35 GMT

    Volunteer firefighters rolled out in one East Texas city today to set a house on fire. It was all part of an unusual set of circumstances that led Big Sandy VFD to seek a unique training opportunity. 

    More >>

    Volunteer firefighters rolled out in one East Texas city today to set a house on fire. It was all part of an unusual set of circumstances that led Big Sandy VFD to seek a unique training opportunity. 

    More >>
  • Pittsburg hold charity chili cook-off

    Pittsburg hold charity chili cook-off

    Saturday, December 16 2017 11:37 PM EST2017-12-17 04:37:15 GMT
    A recent East Texas chili cook-off competition had its origins in the stark reality of the poverty that befalls families with children. A chili cook-off in Pittsburg recently was a competition by teams made up of all first responders. "We ended up with 6 first responder groups from Pittsburg and Camp county," says Pittsburg police chief Richard Penn. But the origins of this competition have a stark beginning. The effort goes back to a welfare check Pittsburg offi...More >>
    A recent East Texas chili cook-off competition had its origins in the stark reality of the poverty that befalls families with children. A chili cook-off in Pittsburg recently was a competition by teams made up of all first responders. "We ended up with 6 first responder groups from Pittsburg and Camp county," says Pittsburg police chief Richard Penn. But the origins of this competition have a stark beginning. The effort goes back to a welfare check Pittsburg offi...More >>
Powered by Frankly