http://news.yahoo.com/s/livescience/20080718/sc_livescience/8signstheanimalkingdomisoutofwhack

 8 Signs the Animal Kingdom Is Out of Whack
 


A polar bear clinging to a melting iceberg may the poster child for global warming, but rising temperatures, pollution and other human activity are also affecting the animal kingdom in far subtler ways. Like the proverbial canary in the coal mine, the natural world could be giving us other signs that human intervention has knocked it way off kilter.
 
Some recent examples:


1. Earlier Migration: Several bird species are making their annual northward jaunt slightly ahead of schedule in recent springs, as the East Coast of the United States heats up, according to a study detailed in the June issue of the journal Global Change Biology. The report confirms similar studies dating back to 2006. Early birds may not sound like a huge deal, but scientists warn that long-distance migrators who start out in South America, and therefore lack cues about the timing of spring in Northern Hemisphere destinations, will be less able to keep pace with the changing climate. "Trees and shrubs are further along in their development, and different groups of insects are out," said lead author Abraham Miller-Rushing of Boston University. "Spring is coming earlier for most other plants and animals, but not for the long-distance migratory birds. Thus, these long-distance migrant birds may need to learn to eat different sources of food or face other challenges because of the changes in timing."