dragonfly essay in english

be given to pollution control and the public should be educated about the importance of biodiversity. Miniature sensors, a computer chip and a solar panel were fitted in a "backpack" over canfor pulp paper research the insect's thorax in front of its wings. Dragonflies feed on pest insects in rice, acting as a natural pest control. Adult males vigorously defend territories near water; these areas provide suitable habitat for the larvae to develop, and for females to lay their eggs. 37 The pair flies in tandem with the male in front, typically perching on a twig or plant stem. In smaller species, this stage may last between two months and three years. "Draper's Genetically Modified Cyborg DragonflEye Takes Flight". The oldest fossils are of the Protodonata from the 325 Mya Upper Carboniferous of Europe, a group that included the largest insect that ever lived, Meganeuropsis permiana from the early Permian, with a wingspan around 750 mm (30 in 2 their fossil record ends with the PermianTriassic extinction. Journal of Tropical Ecology. The chemistry of the water, including its trophic status (degree of enrichment with nutrients) and pH can also affect its use by dragonflies.

Dragonfly essay in english
dragonfly essay in english

For example, the Gomphidae (clubtails) live in running water, and the Libellulidae (skimmers) live in still water. The Southern United States term "snake doctor" refers to a folk belief that dragonflies terror management theory essay follow snakes around and stitch them back together if they are injured. Journal of Experimental Biology. Dragonfly nymphs are usually a well- camouflaged blend of dull brown, green, and grey. Ithaca, NY: Cornell University Press. For example, the blue-eyed darner Rhionaeschna multicolor lives all across North America, and in Central America; 8 emperors Anax live throughout the Americas from as far north as Newfoundland to as far south as Bahia Blanca in Argentina, 9 across Europe to central Asia, North. 49 Flight speed edit Old and unreliable claims are made that dragonflies such as the southern giant darner can fly up to 97 km/h (60 mph). 41 They breathe through gills in their rectum, and can rapidly propel themselves by suddenly expelling water through the anus. 96 In technology edit A dragonfly has been genetically modified with light-sensitive "steering neurons" in its nerve cord to create a cyborg -like "DragonflEye". Among the variables are wing curvature, length and speed of stroke, angle of attack, forward/back position of wing, and phase relative to the other wings. The forerunners of modern Odonata are included in a clade called the Panodonata, which include the basal Zygoptera (damselflies) and the Anisoptera (true dragonflies) 3 Today there are some 3000 species extant around the world. Moonan, Wendy (August 13, 1999).