Analyzing one of the most extensive long-term data series in the North Sea, the Helgoland Roads time series, we investigated the changes in the factors that potentially drive phytoplankton bloom dynamics in the German Bight. We compared the changes in these factors with the changes in the spring bloom phenology. We combined zooplankton, nutrient, weather,… (More)
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The advantages of using a double exponential fitness function are pointed out for the analysis of differential survival data. The uses of this type of function are illustrated on Bumpus' (1898) data on the survival of English sparrows after a severe storm and also on Cook and O'Donald's (1971) data on the over-winter survival of a large sample of snails.
The Fisher-Pitman permutation test can detect any type of difference between two samples: hence, a significant Fisher-Pitman permutation test does not necessarily provide evidence for a difference in means. It is possible, however, to test separately for differences in means and variances. Here, we present a recently proposed two-stage procedure to decide… (More)