Plankton will never win any "cutest sea life" awards, but that doesn't mean there aren't serious repercussions from the effects of the oil spill. The tiny animals (and plants) that make up plankton are the base of the oceanic food chain. And it's called a chain for good reason -- if one link on that chain is lost then it creates a gap that could affect the other links. Nobody knows quite what will ultimately happen, but the long term outlook on larger animals isn't good if the plankton is wiped out. Most fish larvae make plankton their first meal and larger sea life like whales also feed on these tiny organisms.