Life-history of Ephemera danica Müller, 1764 in Sierra Morena (SW-Spain)

The growth and life history of Ephemera danica were studied in a permanent stream in the Sierra Morena. The following measurements of each nymph were made: body length. head length. head width. prothorax width. length of the wing pads and length ofmetafemur. Using standard and logarithmic transformed data. two principal component analyses were made for each sex. Multiple regression analysis were also made. These analyses indicate that dUring the course of development. the only deviation from almost isometric growth is in the wing pad size of both sexes. E. danica was univoltine in this locality.

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