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Home > All Images > 1991 > March > 5 Mar 1991

Images Dated 5th March 1991

Choose from 5 pictures in our Images Dated 5th March 1991 collection for your Wall Art or Photo Gift. All professionally made for Quick Shipping.

Fireflies over bean fields in Iowa Featured 5 Mar 1991 Print

Fireflies over bean fields in Iowa

Fireflies (visible as faint streaks of green light) gathered over bean fields in Iowa, USA, one July evening. Members of the family Lampyridae, these harmless, nocturnal beetles exhibit bioluminescence, the ability of an organism to emit visible light. The energy system for the bioluminescence is of extremely high efficiency, no excess heat is produced, and involves enzyme reactions with oxygen. The insect regulates the flashes of light by controlling the amount of air admitted to the bioluminescent organ, located on its abdomen. The flashing lights enable fireflies to signal their presence to one another, this is of special importance during the mating season