Cool things you didn't know - 3 - Temperatures affect dragonfly wings
Whitetail dragonflies. Center: female. Corners: male. (right one isn't my photo). Whitetail dragonflies are fairly common, one of the most ubiquitous in North America. They live in all Canadian provinces and all US states in North America. Their range is reduced in arid climates but they are still present where freshwater bodies exist. As you can imagine, the variation in habitats over that range would likely affect the insect's phenotype (outward genetic expression). One of the big drivers of adaptation and selection is temperature. As you can see from the above image, male and female whitetailed dragonflies do not look the same; mature adult males have a pronounced white abdomen (juvenile adult males do not) while females have white markings on theirs. Another difference is in the wings, where the males' are relatively shorter, requiring more effort but also allowing greater manoeuvrability. This comes in handy when the...