Abstracts » Environmental issues

Harvesting strategies for Norwegian spring-spawning herring

Article Abstract:

The relative contribution of natural fluctuation in the environment and fishing to the collapse of the Norwegian spring-spawning herring stock during the middle of the last century is analyzed. A suggestion that proportional threshold strategy with a threshold around 14 billion individuals, combined with a harvest of 30-40% of the individuals above this threshold would give a sustainable yield with little annual variation.

Norway, Finfish, Finfish Fishing, Herring, Extinct animals, Herrings

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Bootstrap methods for estimating spatial synchrony of fluctuating populations

Article Abstract:

Methods for estimating spatial correlations used in population ecology are examined. The best results are achieved for parametric bootstrapping, a result that strongly emphasize the importance of defining and estimating as proper population model when studying spatial processes.

Spatial analysis (Statistics)

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Bootstrap methods for estimating spatial synchrony of fluctuating populations: An addendum

Article Abstract:

Bootstrap methods for estimating spatial correlations used in population ecology is described and examined. Results reveal that resampling of locations performed badly, with true coverage level as low as 30-40%, especially for small correlations at long distances.

United States, Stratigraphic correlation, Correlation (Geology), Population ecology

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