Circumpolar Map of Resources at Risk from Oil Spills in the Arctic
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Summer
Freeze-up
Winter
Break-up


 

 

 

 

Statistical Parameters

The table below shows selected statistical of the overlap of species with oil activities. For  each grid block and season, the range of number of species present in the block are shown, as well as mean and variation. From this table, summer was the most biologically active part of the year followed by the autumn Freeze-up period.  Winter had the lowest number of species, while the values in spring Break-up period reflect the arrival of many migratory species for summer breeding and feeding.

 

Season

Maximum

Minimum

Mean

Variance

Standard Deviation

Summer

21

1

6

11

3

Freeze Up

18

2

6

8

3

Winter

9

1

4

2

1

Break-up

13

1

5

5

2