Essay about Effect of Rotanone

2814 Words May 13th, 2015 12 Pages
Comparing LC50 of Insectisides Pirimicarb and Rotenone on Blowfly, Blowfly larvae, Woodlice and Daphni
Abstract
The LC50 of insecticides rotenone and pirimicarb were compared by testing blowfly, blowfly larva, woodlice and daphnia. Rotenone is a NADH dehydrogenase inhibitor causing death by oxidative stress however pirimicarb causes toxicity through acetylcholinesterase inhibition. It was found that rotenone had large toxic effects on daphnia, blowflies and woodlice but not maggots and pirimicarb had low toxic effects on all of the organisms tested. Due to the low percentage death caused by pirimicarb a LC50, however in rotenone a LC50 was performed for daphnia, woodlice and blowfly the LC50 for each organism was compared concluding that
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Woodlice are nocturnal and are classified as primary decomposers, feeding on organic materials such as bark, leaves, dead plant and animal matter and hardwood, decomposing the debris into soil which is vital for the ecosystem (Nardi 2009, Poole 1994 & CapineraI 2010). Woodlice can also be classified as secondary decomposers as they feed on their own faeces to replenish the copper containing oxygen –absorbing pigment lost when they defecate. Urine is also recycled in the water conducting channels along with water that is taken up from the environment, the ammonia of the urine evaporates and from the remaining water in the water conducting channels oxygen is absorbed by pleopods (Nardi 2009). Daphnia, also known as water fleas, are small crustaceans about 1mm-5mm long and are part of the freshwater zooplankton (Ebert 2005, Hutchinson 2005 & Clifford 1991). Daphnia can be found in most fresh water habitats such as freshwater springs, ponds and reservoirs and are the predominant food for planktivorous fish. Dapnia are ‘filter feeders’ meaning they feed on small particles suspended in the water which can include algae. It has been found that daphnia tend to migrate to the upper parts of the water at night and return to the lower parts of the water in the day to hide from predators (Ebert 2005) (Hutchinson 2005). Daphnia can reproduce through sexual reproduction and also asexual…

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