(Reuters) - Plants and animals are shrinking because of warmer temperatures and lack of water, researchers said on Monday, warning it could have profound implications for food production in years ahead. "The worst-case scenarios ... are that food crops and animals will shrink enough to have real implications for food security," Assistant Professor David Bickford, of the National University of Singapore's biological sciences department, said. Bickford and colleague Jennifer Sheridan trawled through fossil records and dozens of studies which showed that many species of plants and creatures such as spiders, beetles, bees, ants and cicadas have shrunk over time in...