Glucose Aversion Affects German Cockroach Mating Behavior
A recent study published in the Journal of Economic Entomology has found that glucose aversion in German cockroaches caused by the use of sugar in traps has affected their mating behavior. Male German cockroaches attract females by secreting a “nuptial gift” that includes sugar maltose. However, females who have an aversion to glucose are less likely to mate, affecting future reproduction of the species.
Evolutionary Adaptations in Male German Cockroaches
To combat this problem, some male cockroaches have evolved to have an aversion to glucose as well. They have adapted their nuptial gift to have less glucose and more maltotriose, which breaks down into glucose after 5 minutes in saliva. These males also shortened the courtship process to avoid glucose conversion. However, ordinary male cockroaches now have a gift too rich in glucose and take too long to start mating for many females’ taste.
Control Measures for Cockroach Populations
Understanding glucose aversion in cockroaches is important for controlling their numbers. Using glucose in cockroach traps has led to some cockroaches developing an aversion to it. Some scientists recommend no longer using glucose in cockroach traps, as bait-snubbing cockroaches can outcompete mutant cockroaches who remain glucoseloving.
The Remarkable Adaptability of Cockroaches
This study also sheds light on the remarkable adaptability of German cockroaches. Researchers used sugary poisons for controlling their populations, but some developed aversions to them and became bait-snubbing roaches. Glucose-averse female cockroaches produce saliva that’s less effective at converting maltose to glucose. Adaptability in this regard is an evolutionary necessity for cockroaches.
The Link Between Natural Selection and Sexual Selection
The evolving adaptability of cockroaches is an example of the link between natural selection and sexual selection. Male cockroaches secrete sugary fluid to attract females for mating. Some cockroaches evolved to have a distaste for glucose, causing them to refuse the sugary gifts. Male cockroaches have adapted their mating strategy to secrete a new formula and hook females faster. Glucose-averse females now refuse sugary gifts from non-glucose-averse males, mating only with glucose-averse males.
In conclusion, the use of sugar in traps has affected the mating behavior of German cockroaches, leading to their remarkable adaptability through evolutionary processes. Glucose aversion is an adaptation necessary for controlling their populations, as bait-snubbing roaches can outcompete glucoseloving mutants. Understanding these processes is important for controlling cockroach numbers while also preserving genetic diversity within the species.
Image Source: Wikimedia Commons
