Fireflies manage to make summer nights special for those who are lucky enough to see them appear in a park or garden with their little flashes.
In Europe we mainly find three species of fireflies, two of which are also present in Italy where 18 species of fireflies have been catalogued, many of which are endemic and characteristic of certain regions or limited areas (such as species Lamprohiza boieldieui And Lampyris vesuvius)
Unfortunately, fireflies are becoming extinct around the world due to pollution, the use of pesticides and the destruction of natural habitats. (Read also: Why fireflies are disappearing (and what we can do)
Being able to see fireflies these days is truly lucky. And the paradox is also being created that the more we try to want to see them, the more we put them at risk
But are you sure you know everything about fireflies? Here are 5 curiosities about fireflies that perhaps you didn’t know.
Why do fireflies emit light?
Fireflies emit light when, in the presence of oxygen and thanks to the action of the luciferase enzyme, the oxidation of luciferin occurs, which transforms into oxyluciferin. The wavelength of the light emitted by fireflies varies between 500 and 650 nanometers, while the intensity of the light varies depending on the species.
Synchrony
The fireflies of the species P. carolinuswhich light up in synchrony, have a rather short lifespan, lasting only 2 to 4 weeks after reaching adulthood, according to naturalist Lynn Faust. Therefore in this period of time the fireflies use all their energy for reproduction and offer truly astonishing light shows, lighting up in perfect synchrony.
Female cannibals
This is probably a little-known characteristic regarding female fireflies. Entomologists have nicknamed the female fireflies of the Photuris genus “Femme Fatales” because they feed on the male P. carolinus fireflies by attacking them with a special move, called “Hawking”. Female Photuris fireflies flash in imitation of female P. carolinus. In this way they attract P. caolinus males who, against their will, face death instead of mating. This is because female Photuris fireflies are looking for additional nutrients in preparation for laying eggs.
They have poison
Many fireflies make defensive substances similar to the venom found in toads. Predators do not like such substances and have learned to avoid feeding on fireflies. Fireflies of the Photuris genus do not have venom, but are able to absorb it by eating other fireflies. In this way the absorbed poison passes to the eggs, to safeguard future generations.
They defend themselves…with blood
However, synchronous fireflies of the genus P. carolinus are not completely defenseless. If they are attacked by a “Femme Fatale” they emit some of their blood, according to a phenomenon that scientists define as “reflex hemorrhage”. The blood coagulates to form a sticky mass in the mouth of the cannibalistic firefly, sometimes giving the victim time to escape.
Here are 5 other curiosities that you can add to the article while maintaining the same informative approach.
Not all fireflies fly
When we think of fireflies we imagine small, luminous insects hovering in the air on summer evenings. In reality, in many species females are unable to fly. They look similar to larvae and remain in the grass or on the ground, while the males fly over the area emitting light signals in search of a mate. It is precisely this dialogue of flashes that allows them to recognize each other.
Even the larvae glow
The ability to produce light is not exclusive to adult specimens. The larvae of many firefly species are also bioluminescent and are sometimes called “glowworms.” Scientists believe that this light serves primarily as a warning signal to discourage predators, indicating that the animal is not attractive prey.
They are precious sentinels of the environment
The presence of fireflies is considered an important indicator of the quality of ecosystems. These insects are particularly sensitive to light pollution, pesticides and loss of natural habitats. When an area is home to numerous fireflies it often means that the environment is still relatively healthy, with good biodiversity and limited human disturbance.
They spend most of their lives as larvae
The adult phase of fireflies generally lasts a few weeks, but their life cycle is much longer. Most of their existence is spent in the larval stage, which can last from one to three years depending on the species and environmental conditions. During this period they feed mainly on snails, snails and other small invertebrates.
Their light is among the most efficient in nature
The bioluminescence of fireflies is a true masterpiece of evolution. Almost all the energy produced during the chemical reaction is transformed into light, with minimal loss in the form of heat. For this reason, firefly light is often referred to as “cold light” and is much more efficient than common man-made incandescent light bulbs.
Don’t want to miss the firefly show?
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