Blue Dasher

After a 2012 road trip, I posted a photo of a female Blue Dasher Dragonfly. This year, I found this male Blue Dasher, Pachydiplax longipennis, on a dock at Lake Geneva, Wisconsin. Male and female Blue Dashers are sexually dimorphic, that is, their color patterns differ. Male Blue Dashers have a bluish-white color on their abdomen that is used as a signal to other males in territorial disputes. Male Blue Dashers guard territories that contain prime egg laying sites. The males are prominent and common near lakes and ponds. This species is widely distributed in the US and common throughout the summer.

Male Blue Dasher

Male Blue Dasher

About jjneal

Jonathan Neal is a retired Associate Professor of Entomology at Purdue University and author of the textbook, Living With Insects (2010). This blog is a forum to communicate about the intersection of insects with people and policy. This is a personal blog. The opinions and materials posted here are those of the author and are in no way connected with those of my employer.
This entry was posted in behavior, by jjneal, Environment. Bookmark the permalink.

2 Responses to Blue Dasher

  1. Emily Peterson says:

    I thought this Blue Dasher dragonfly looked rather interesting because I have never seen such a pretty colored dragonfly before! I referred back to the article on the female and was surprised to see it has no blue at all, which makes the male extra special. The male dragonfly uses its color for signaling and I did not know that color is used for that reason because I always though the color was used to attract mates. My parents own a pond and we always have numerous dragonflies there, so I now wonder what type of dragonflies they are!

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