Experts on invertebrates have expressed "profound shock" over a government report showing a decline in zooplankton of more than 70% since the 1960s.The tiny animals are an important food for fish, mammals and crustaceans. Figures contained in the Department for Environment Food and Rural Affairs (Defra) document, Marine Programme Plan, suggested a fall in abundance. Charity Buglife said it could be a "biodiversity disaster of enormous proportions". They said it could have implications for creatures all the way up the food chain, from sand eels to the seabirds, such as puffin, which feed on the fish. Defra described the Marine...