منابع مشابه
Predation, competition, and the recovery of overexploited fish stocks in marine reserves
Community interactions alter the management actions necessary to recover overfished species using marine reserves. For example, in communities where a larger species preys on their juveniles’ competitors, overfishing of the larger species may cause prey population expansion; subsequent increased competition for the juveniles of the overfished species may impede its recovery within reserves. We ...
متن کاملExploitation dynamics of fish stocks
I address the question of the fluctuations in fishery landings. Using the fishery statistics time-series collected by the Food and Agriculture Organization of the United Nations since the early 1950s, I here analyze fishing activities and find two scaling features of capture fisheries production: (i) the standard deviation of growth rate of the domestically landed catches decays as a power-law ...
متن کاملStatistical Modelling of Fish Stocks
Major sources of information for the estimation of the size of the sh stocks and the rate of their exploitation are samples from which the agecomposition of catches may be determined. However, the age-composition in the catches often varies as a result of several factors. Strati cation of the sampling is desirable because it leads to better estimates of the agecomposition and the corresponding ...
متن کاملManagement of evolving fish stocks
Today, fishing is the major source of mortality in many harvested fish stocks. The new high fishing mortality regime may induce evolutionary change in the harvested population, because the currently observed life-history patterns in fish stocks presumably reflect adaptation to past mortality regimes. Changes in these life-history patterns are likely to have an influence on, for example, the sus...
متن کاملFish Stocks Major Adaptations of Fishes
Glossary Biomass Collective weight or mass of all the members of a given population or stock at a given time, or, on the average, over a certain time period. Bioquads Occurrence record of organisms, serving as key units for biodiversity research and consisting of four elements (species names, location, time, and source). Catches The fish (or other aquatic organisms) of a given stock killed duri...
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ژورنال
عنوان ژورنال: Nature
سال: 2001
ISSN: 0028-0836,1476-4687
DOI: 10.1038/news011206-1