As a crescendo to the insect month, the last day of July has been the first day of the flying ant season here. Whilst they can be somewhat intrusive, I am always excited to see this spectacle, and spare a thought that soon after mating, the male ants will die. The winged alates, (both the larger new queens and smaller males) are much bigger than the un-winged worker ants of the same species that we usually see in the garden. Triggered by specific biological timing and weather conditions – usually hot summer days after rain, all the nests in an area commence their nuptial flight simultaneously, minimising predator risk and increasing chances of genetic mixing. Large swarms around 50 miles wide can be seen from space and are sometimes picked up on meteorological radars. The new queens mate with a few males to increase the DNA variation and store the sperm in an abdominal organ called a spermatheca where it will be used for the duration of their lifetime, which could be over 15 years. Once they have mated they chew off their wings and look for a suitable nest site. Perhaps as few as a single princess will survive – even if she finds safety from predators and obstacles, she then needs to lay eggs and tend to them whilst she tries to avoid starvation. These first ants, called nanitics, set out to feed her. All worker ants are sterile females, hatched from fertilised eggs. Only when her colony has grown large enough, which may take years, will she start to lay unfertilised eggs which become males, and allow some female larvae to fully develop into new queens, filling the nest with aletes waiting to take their own flight. In the case of my swarm, the sunny intensity of the day was followed in the evening with a powerful short downpour, and I felt a wave of empathy as I watched bucketfuls of rain swipe the tiny winged bodies off the roof.
It is so fascinating nature which is near our everyday lives. I didn’t know that normal garden ants and flying ants are the same species! It’s so fascinating.