Marine ecology-- Ocean ecology-- Sea ecology 117 Marine biology-- Biological oceanography, Marine Science 115 Marine ecology 71 Oceanography 53 Marine pollution 50 Marine biology 39 Marine fishes 31 Marine pollution-- Pollution in Ocean 31 Spanish fiction 30 Marine phytoplankton 26 Zooplanktons-- marine invertebrates, marine zooplankton 26 Novel 24 Ecology 23 Fisheries 22 Fishes 22 History 21 Marine animals 19 Marine mammals 18 Marine resources 18 Marine animals-- Marine zoology 17 Fishery management 16 Literature 16 Marine sediments 15 Marine Resource- economics 14 American fiction 13 Marine insurance 13 Research 13 Climatic changes 12 Law and legislation 12 Marine chemistry-- Aquatic chemistry 12