PANAMA CITY BEACH, Fla.-- In sensitive marshes on the Louisiana coast, oil thick as pancake batter suffocates grasses and traps pelicans. Blobs of tar the size of dimes or dinner plates dot the white sands of Alabama and the Florida Panhandle. Little seems amiss in Mississippi except a shortage of tourists, but an oily sheen glides atop the sea west of Tampa. The oil spill plaguing the states along the Gulf of Mexico isn't one slick ��" it's many. "We're no longer dealing with a large, monolithic spill," Coast Guard Adm. Thad Allen said Monday at a White House news conference. "We're dealing with an aggregation of hundreds of thousands of patches of oil that are going a lot of different directions." Officials reported that a containment cap over the BP gusher at the bottom of the Gulf was sucking up one-third to three-quarters of the oil — but also noted that its effects could linger for years. And as the oil patches flirt with the coastline, slathering some spots and leaving others alone, residents who depend on tourism and fishing are wondering in the here and now how to head off the damage or salvage a season that's nearing its peak. At the Salty Dog Surf Shop in Panama City Beach, near the eastern end of the spill area, manager Glen Thaxton hawked T-shirts, flip-flops and sunglasses with usual briskness Monday, even as officials there warned oil could appear on the sand within 72 hours. "It could come to a screeching halt real quick," Thaxton said. "So we've been calling vendors and telling them don't ship anything else until further notice." In Mississippi, Gov. Haley Barbour over the weekend angrily blasted news coverage that he said was scaring away tourists at the start of the busy summer season by making it seem as if "the whole coast from Florida to Texas is ankle-deep in oil." Mississippi, he insisted on "Fox News Sunday," was clean. That sounded about right to Darlene Kimball, who runs Kimball Seafood on the docks at Pass Christian. "Mississippi waters are open, and we're catching shrimp," Kimball said. Still, her business is hurting because of a perception that Gulf seafood isn't safe, she said, and because many shrimpers have signed up to help corral the spill elsewhere. The random, scattered nature of the oil was evident Monday during a trip across the state line between Alabama and Florida. On the Alabama side, clumps of seaweed laden with oil littered beaches for miles. Huge orange globs stained the sand in places. But at Perdido Key, on the Florida side, the sand was white and virtually crude-free. Members of a five-person crew had to look for small dots of oil to pick up, stooping over every few yards for another piece. "It's beautiful here today," said Josiah Holmes, of Gulf Shores, Ala. He and his wife, Lydia, had driven across the state line because the beach was such a mess at home. For some who are planning vacations in the region but live elsewhere, the spill's fickle nature is causing confusion. Adam Warriner, a customer service agent with California-based CSA Travel protection, said the company is getting a lot of calls from vacationers worried the oil will disrupt their trips ��" even if they're headed to South Carolina, nowhere near the spill area. "As of now we haven't included oil into any of our coverage language, and that's not something that I've heard is happening," he said. That kind of misperception worries residents and officials in areas that aren't being hit hard by the oil ��" and even those in some that are.