Related by context. Frequent words. (Click for all words.) 56 plankton 55 mammals 55 zooplankton 55 gobies 55 terrestrial ecosystems 54 copepods 54 marine ecosystems 54 species 53 ocean ecosystems 52 reefs 52 seagrasses 51 sea urchins 51 invertebrates 51 megafauna 51 habitat degradation 51 herbivores 51 krill 51 marine organisms 51 kelp forests 50 spiny dogfish 50 phytoplankton 50 basking sharks 50 biota 49 crustaceans 49 corals 49 filter feeders 49 petrels 49 molluscs 49 leatherbacks 49 baleen whales 48 coral reefs 48 basking shark 48 coral species 48 ocean acidity 48 overexploitation 48 seabirds 48 benthic 48 seagrass beds 48 leatherback turtle 48 eelgrass 48 species extinctions 48 fish 47 aquatic insects 47 Overfishing 47 coral 47 Nile perch 47 sealife 47 wading birds 47 predation 47 Coral reefs 47 sea creatures 47 kelp 47 mountain glaciers 47 snails 47 pelagic 47 cetaceans 47 bay scallops 47 jellyfish 47 Humboldt squid 47 capelin 47 freshwater ecosystems 47 scaup 46 coastal ecosystems 46 tiger sharks 46 overhunting 46 microscopic algae 46 carnivores 46 larval 46 threadfin shad 46 eel grass 46 leatherback turtles 46 trophic 46 parrotfish 46 vertebrate species 46 sawfish 46 taxa 46 Phytoplankton 46 Steller sea lions 46 avian species 46 tunas 46 intertidal 46 stratospheric ozone 46 herbivore 46 ungulates 45 gillnets 45 cuttlefish 45 snowshoe hare 45 waterbirds 45 amphibians 45 sea otters 45 marine ecosystem 45 habitat fragmentation 45 alewives 45 invertebrate 45 bony fish 45 mammal 45 bird species 45 squid 45 seamounts 45 landmasses 45 insect populations