Dynamic Changes in Marine Ecosystems Fishing, Food Webs, and Future Options (2006) / Chapter Skim
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Appendix D Glossary
Appendix D Glossary
Pages 147-154
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Appendix D Glossary abundance: Measure of a population size. The quantity of individuals in a popu lation or in a specific area (e.g., fishing grounds)
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148 APPENDIX D bottom-up management: A process of management in which information and decisions are decentralized and in which resource users actively participate in the decision-making process. bycatch: The portion of a fishing catch that is discarded as unwanted or commer cially unusable.
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APPENDIX D 149 abundance and distribution, higher local rainfall and flooding, and massive deaths of fish and their predators (including birds)
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150 APPENDIX D input control: Management instruments used to control the time and place as well as type and/or amount of fishing to limit yields and fishing mortality; e.g., restrictions on type and quantity of gear, effort, and capacity; closed seasons. interaction webs: A food web diagram depicting the strength of interactions among species; species are linked by arrows indicating the general conse quences of altering the abundance or mass of critically important species.
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APPENDIX D 151 optimum yield: The harvest level for a species that achieves the greatest overall benefits, including economic, social, and biological considerations. Opti mum yield is different from maximum sustainable yield in that the MSY considers only the biology of the species.
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152 APPENDIX D rehabilitation: To improve the quality of a habitat or ecosystem, but not necessarily to fully restore all functions to their undisturbed condition. restoration: To return an ecosystem to a close approximation of its condition prior to disturbance.
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APPENDIX D 153 sustainability: Characteristic of resources that are managed so that the natural capital stock is non-declining through time while production opportunities are maintained for the future. sustainable yield: The number or weight of fish in a stock that can be taken by fishing without reducing the stock biomass from year to year, assuming that environmental conditions remain the same.
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