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I have statistics on the occurence of the Pine Processionary moth (Thaumetopoea pityocampa); we have the regions that are located in Algeria, infested area in percent, the defiliation degree (small, medium and high) and we have geographical location (longitude, lattitude).

The table is as follows:

enter image description here

Why is there a difference between infested areas, and is there a special pattern for the distribution of this insect? Is it known what the main drivers are for determining the distribution and abundance of this moth, and thereby why some areas are more infested than others?

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I think you should merge this question with biology.stackexchange.com/questions/19103/…, since they are very similar and clearly overlap. –  fileunderwater Jan 13 at 22:58

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