Ancient origins found in arabidopsis genome
...the Theory Center at Cornell. With help from the dating estimates obtained by paleobotanists, the team was able to look at the duplicated gene sequences and deduce when the genome duplications in Arabidopsis occurred. The team found that a few large duplication events were responsible for the pattern...Changes in Australian ecosystems tied to arrival of exotic animals
... which has proven to be an accurate time clock for dating events going back thousands of years. "Because these eggshells can be dated by both radiocarbon methods and amino acids, they offer a unique opportunity to look back at ecosystem changes over the last 70,000 years," said Miller, a fellow of CU-Bou...Scientists shake up "family tree" of green plants
...ajor lineages with separate evolutionary histories dating back 400 million years. It will likely have a significant impact on several disciplines, including ecology, evolutionary biology and plant developmental genetics," said Kathleen Pryer, lead author of the paper and assistant curator in botany at The F......three scales: across all flowering plants, a group dating back 140 million years; within one very species-rich family of flowering plants, the legumes, dating back perhaps 60 million years; and within a much more recent radiation of plants in Hawaii, which is...A first: A (nearly) complete road map for the evolution of placental mammals
...ibraries, the researchers identified 16,102 papers dating back to 1966 on placental mammal evolution. In more than two years and thousands of hours, the team then narrowed the field to 1,477 papers that seemed to offer particularly promising data. Among this group, they found 315 publications that contained...Anthropologists find evidence of early humans in southern China cave
...ed an unusual collection of animal and human teeth dating back over 200,000 years deep inside a southern China cave. The evidence for human occupation of the cave is clear. There are stone tool cut marks on the animal bones, repeated findings of burnt bone, andunusual collections of bones and teeth fromanim...Major fossil find reveals Asian origins of salamanders
...in the local forest preserve or in a rock in China dating back 150 million years, they look alike. In fact, they look alike in great detail--the bones in their wrists are the same, the way their skulls are formed--intricate details are the same," said Shubin. At the same time, their limbs and heads have ...Pesticide, urbanization linked to frog declines
... Shaffer compared museum records of theirhabitats, dating back to the mid-1800s, with recent surveydata. "From the museum specimens we know where the frogs usedto be. Recent survey data tells where they are now," Davidsonsaid. Of the 237 sites they looked at that once had frogpopulations, 48 percent no long...First dinosaur found with its body covering intact; displays primitive feathers from head to toe
... reptiles, shrimp, flowers, mammals, and dinosaurs dating back to late Jurassic and early Cretaceous timesbetween 145 and 120 million years ago. At that time, the region was dotted with freshwater lakes and volcanoes. Volcanic explosions rained fine ash into the lakes, and animals that died or fell into ...Technology patented to create Pierces disease-resistant grapevines
...t best, temporary relief, according to UF research dating back to the 1920s, Gray said. Another advantage of the genetically modified plants is that they could open the door to growing more valuable wine- and table-grape varieties in the Southeast and Florida, he added. Pierces disease is caused by a spe...Study of marine snail suggests conservation efforts should consider factors beyond genetic diversity
...lls of the same species found in coastal sediments dating back to the late Pleistocene (125,000 to 11,000 years ago) and even earlier, when the planet went through a series of ice ages. During those ice ages, the cooling of the planet caused localized extinctions of many populations of marine and terrestri...July media highlights: GEOLOGY and GSA TODAY
...639-642These authors applied new and sophisticated dating mechanisms for corals in the Caribbean. What they...rchaeological sites prior to sampling the site for dating purposes. The authors contend that the geologic history of archeological sites, in this case those a...Earliest human ancestors discovered in Ethiopia
... of the earliest known human ancestor in Ethiopia, dating to between 5.2 and 5.8 million years ago and which...as trapped in the rock after it cools. "The argon dating results were corroborated by geomagnetic polarity data, then further confirmed by biochronological a...August media highlights GEOLOGY and GSA TODAY
...ontentious controversy revolving around its use in dating geomorphic surfaces and/or evaluating past climate conditions. This paper summarizes findings that support the view that careful sampling and analysis of varnish microbasins can potentially be useful in reconstructing past climates in deserts, an imp...Overfishing sets the stage for other problems in marine ecosystems
... In Maine, we have evidence from Indian middens dating back 5,000 yearsthat our coastal zone was dominated by large predatory fish such as cod.The average size of cod for thousands of years was about a meter longwhich is impressive considering the fishers used crude hooks made of deerbone with line made ...Scientists examine the seas our ancestors fished to better understand today's changing oceans
...ined paleoecological records from marine sediments dating from about 125,000 years ago; archaeological records from human coastal settlements occupied after about 10,000 years ago; historical records from documents of the first European trade-based colonial expansion in the Americas and South Pacific in the...Mercury at bottom of central park lake linked to coal burning in NYC
.... Bopps team studied core samples of lake sediment dating back to the 1860s. After consulting historical rec...tmospheric inputs of mercury in levels of sediment dating from the early 1900s, when coal use peaked in the New York City area. Last December, the EPA report...Blame North America megafauna extinction on climate change, not human ancestors
...before the present. Well-accepted Clovis sites dating between 10,800 and 11,300 years ago have been found in North America, and distinctive, fluted projectile points mark this culture. Clovis artifacts have been found with mammoth remains in more than a dozen sites across the Great Plains and the southw...Betting on climate change: Alaskan gambling contest yields treasure trove of scientific data
...tish naturalists, some of whom have family records dating back to the 1750s of when the first leaf appeared on a particular tree in spring," Sagarin says. Ingenious contraption The Nenana Ice Classic was created in 1917 by engineers building a railroad bridge across the Tanana River, about 50 miles southwes...