close-up of bull kelp seaweeds washed ashore

seaweed kelp brown coast plant ocean group marine water nature vegetation sea ashore pacific texture beach nereocystis shore sand background luetkeana algae washed low tide closeup bulb coastal environment flora stranded outdoor bladder wrack large pollution ecosystem problem sustainability coastline biodiversity underwater world habitat creatures climate change oceanography global warming biology pile heap small close-up bull seaweeds beach concept