Coral reef and Desert ecosystem. The coral reef and desert ecosystem can be very similar or very different.The difference between the biotic and abiotic factors in the coral reef and the desert the ones in the coral reef live under water ,and in the desert none of them live under water only some of the fish do. Some of the biotic animals in the coral reef are dolphins and seals. bivalves, gastropods, tunicates, sponges, polychaete and feather duster worms, some corals, sea urchins, some crabs, green sea turtles, and herbivorous fish.Large reef fish, sharks, eels and barracudas. Some of the biotic animals in the desert are the gerbil, jerboa, Cape hare, desert hedgehog, barbary sheep, dorcas gazelle, sand fox, common jackal, spotted hyena, and the slender mongoose. Some of the biotic plants in the desert are the cypress, olive, and mastic trees aacia, artemisia, doum palm, oleander, date palm, and thyme trees. The coral reef is part of an ocean biome which is a big group of very similar ecosystems.…