Humans significantly altered biodiversity on islands, study shows By Zarrin Ahmed A research team on Tenerife takes sediment cores containing pollen, which revealed the effects of more recent human colonization of the island. Photo by José María Fernández Palacios/University of Bayreuth April 30 (UPI) -- An international team of researchers found that humans have significantly altered biodiversity on colonized islands in the past 1,500 years, according to a study published Friday in the journal Science. By analyzing 27 fossil pollen sequences encompassing 5,000 years from islands across...