Chondrichthyes 1 Conservation 1 Ecological role 1 Ecological roles 1 Ecosystem functioning 1 Ecosystem functions 1 Ecosystems 1 Ecuador 1 Endemic species 1 Energy transfer 1 Fisheries 1 Food web model 1 Food-web model 1 Galapagos Islands 1 Galapagos Marine Reserve 1 Information management 1 Mammalia 1 Mammals 1 Marine biology 1 Mycteroperca olfax 1 Shelf ecosystems 1 Sustainability of fisheries Sustainability of fishery 1 Sustainable development 1 Threatened species 1 Trophic level 1 Zalophus wollebaeki 1 artisanal fishery 1 conservation management 1 ecological modeling 1