Changing distribution patterns along a stream in adults of Calopteryx haemorrhoidalis (Odonata: Calopterygidae): a case of larval-drift compensation?

Changing distribution patterns along a stream in adults of Calopteryx haemorrhoidalis (Odonata: Calopterygidae): a case of larval-drift compensation? 00

Jan J. Beukemaa

  1. Netherlands Institute for Sea Research, AB Den Burg, The Netherlands

International Journal of Odonatology, Volume 5, Issue 1, Pages 1-14, 2002

https://doi.org/10.1080/13887890.2002.9748173

Published: 1 April 2002 (Received: 11 April 2001, Accepted: 5 September 2001)

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Abstract

The distribution of an isolated population of adult Calopteryx haemorrhoidalis was studied along a small stream in NE Spain, during two-week or three-week summer periods over five years. Distribution patterns differed consistently between age groups. Reproductive activities took place along the entire stream, whereas the presence of tenerals and older immature individuals was restricted to the lower reaches of the stream. It is concluded that emergence took place only in the lower reaches and that this can be explained by larval drift due to strong currents regularly depleting the upper half of the stream.

Keywords: Odonata, dragonfly, damselfly, Calopteryx, along-stream distribution, upstream movements, drift compensation, adult life stages

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