Population size and age determination in the Antarctic fur seal Arctocephalus gazella

first_imgThe population of Antarctic Fur seals Arctocephalus gazella at South Georgia is increasing rapidly and is therefore of great interest. Investigations of the population depend on two main techniques. (1) Population assessment, because the population size is now too large for direct counts to be completely reliable, and serious underestimates are appearing in areas of high density. Aerial photography was used but needs further refinement before it becomes a consistently useful technique. Marking all pups on sample beaches was largely unsuccessful because pups moved from beach to beach before they could all be marked. A mark–recapture method was finally adopted and indicated that the numbers of pups present may be up to 54% higher than the numbers actually counted. (2) The process of age determination from tooth characters, which is more difficult for Fur seals than other pinnipeds. The preparation and interpretation of the teeth of breeding cows is described, based on eleven specimens of known age. The most accurate results are obtained from whole teeth up to the age of 6, but thereafter interpretation of cement and dentine layers in thin sections must be used. It is concluded that while young animals are aged quite accurately, there is probably a tendency to underestimate the age of seals of more than 9 years.last_img read more

Scientists Live in the World’s Highest Space Laboratory

first_imgBy Dialogo March 20, 2009 I have one little history about that event “Earth Hour,” yesterday, every year, allover the planet. Could it help the planet, of course, but there is something more deep in that fact that we need to figure out. For mine thinks, it’s one point the view very restrict where we‘ll see the results that experiment lights years after. The idea is The Earth Hour is one away to sent a signal of the life to universe, If you don’t believe about this point than you need to look for information from, NASA, the ALMA complex (Chilean Andes), The AOS (Array Operations Site – Tibet), believe or not something are happening more than you can think. North American, Japanese, and European scientists live and work together daily in the world’s highest space laboratory, located more than 5,060 meters above sea level in the Chilean Andes, where the ALMA complex, the most advanced radio astronomy observatory in the world, will be installed. The AOS (Array Operations Site) is the second highest building in the world, in the Llano de Chajnantor, at the end of a railroad station located a few feet below the mountains of Tibet, an ALMA representative explained to EFE. It is an oxygenated and pressurized area; allowing employees to work in a safe and comfortable environment, despite its altitude of over 5,000 meters, where breathing and moving are difficult tasks because of the low oxygen concentration. The almost total lack of humidity in this northern region of Chile, approximately 1,650 kilometers from Santiago, is one of the conditions that facilitate observation of the millimeter and sub millimeter wavelengths released by galaxies and stars, but it also makes lips and throats extremely dry, increasing the need for constant hydration. The thin atmosphere is aggravated by brutal temperature differences, from -10 degrees Celsius at night to almost 30 degrees Celsius during the day, characteristic of the world’s driest deserts, such the Atacama Desert, and of very high mountains, such as the Andes. Any visit to the AOS is preceded by a medical checkup in order to guarantee that the individual is in sufficient physical condition to ascend to such elevations, making that individual accountable for anything that may happen due to such circumstances. The buildings are equipped with 30 SPF sunscreen dispensers located near all exterior doors, and bottles of water are available throughout all buildings for both workers and visitors. Workers currently building equipment for the observatory have to carry small oxygen cylinders and cover themselves well with sunscreen to protect themselves from harmful ultraviolet rays, which are more dangerous at an altitude of 5,000 meters. The AOS will also house the world’s most powerful computer, the Correlater, which will receive signals from the 66 antennas which will create ALMA’s radio telescope, and after this process the signals will be sent to the second technical building in the complex, located 2,900 meters away, via a fiber optic connection. The Atacama Large Millimeter/Sub millimeter Array (ALMA) is the largest global scientific project created by European, North American, and Japanese partners, in cooperation with the Republic of Chile. ALMA will offer the ability to study the origin of the cosmos through the observation of the millimeter and sub millimeter wavelengths released by the particles which form galaxies, planets, and stars. In radio astronomy, visible light and optical observation of the sky are replaced by the analysis of another type of wave, which, for the first time in history, will provide information on the age of the universe, the activity of the sun, and the formation of galaxies.last_img read more

Foster Closet of Michigan, Alpena County Branch Thanks Community for Donations

first_imgAddThis Sharing ButtonsShare to FacebookFacebookShare to TwitterTwitterShare to MoreAddThisThe Foster Closet of Michigan Alpena County Branch would like to thank the community for their generous donations.The closet, which is a nonprofit organization helping out foster parents, and licensed relative care givers…providing them with various items including clothing, furniture, car seats and more.The closet recently received a donation by the DaVita Alpena Dialysis Center. They also received a check last month by the Northern Collision and Auto Repair.Alpena Branch Coordinator Lorilee McGee said they are thankful for the generosity from the community.“It’s great! I love it when people call me out of the blue and they say ‘we would like to donate to the foster closet. We believe in your vision and how can we help.’ It’s just exciting we’ve got such an overwhelming response from the community it’s such a blessing to live with such caring people,” McGee said.The Foster Closet Alpena Branch will be hosting a sorting day Saturday to organize items received by donations.Anyone who wants to participate can come to the closet located beside Thunder Bowl Lanes from 10 am until 3 pm.AddThis Sharing ButtonsShare to FacebookFacebookShare to TwitterTwitterShare to MoreAddThis Tags: DaVita Alpena Dialysis Center, Foster Closet, Foster Closet Alpena Branch, Northern Collision and Auto Repair, Thunder Bowl LanesContinue ReadingPrevious Man in Custody After Threatening a Lewiston Woman with a GunNext Thunder Bay National Marine Sanctuary Awarded Major Grantlast_img read more