Aquatic Control

Topics: Aquatic ecosystem, Water, Lemna Pages: 10 (3100 words) Published: May 13, 2013
Aquatic Control
A study of the effects of Zinc upon Lemnoideae.
Student: Adam Marsh
Class:Grade 12 Biology EEI
Teacher:Mr. Hodo

This report details the findings of an investigation surrounding the growth and death rate of Lemonodaie. Though it holds a staple point as a major pest in aquatic areas, it has been largely ignored due to the difficulty regarding controlling the population of such a plant. This was the main stimulation in executing this study, as finding an effective method of controlling duckweed population would be an interesting breakthrough in aquatic regulation. Due to duckweed growing at an unprecedented rate, treating this condition was a relatively strong dose of zinc chloride (ZnCl2), of which were added to separate aquariums of duckweed at different levels, to measure the retardation of the growth of the duckweed. It is reasonable to predict that if the specimen is exposed to over 18mg/l of zinc, then the duckweed will be terminated at a far higher rate than those of lesser dosage, though only if kept in a consistent environment, in comparison to the 15mg/l, of which it shall incorporate a resistance. As a result, the hypothesis concluded to be un proven, with both 18 and 15 gram zinc levels dying within a short timeframe, without building any noticeable resistance.


Table of Contents










1/ Introduction

The study of Aquatic Ecology is a vital section of biology, especially if one aims to understand the majority of areas relevant to the vast science. Water encapsulates an incredible 71% of Earth’s surface, thus is an essential factor in dictating ones place in the struggle of life. The vast majority of species, (such as humans, mammals, reptiles, etc.) are entirely dependent on water, literally requiring daily intake in order to survive. This, in turn, outlines the monumental importance of harnessing, controlling and thusly studying the aquatic environment and its ongoing species development.

Throughout Australia, Lemnoideae (Duckweed) has become an immovable element of its aquatic environments. Collectively known as the world’s smallest flowering plant, Common duckweed is a seed-bearing plant that is very small, light green and free-floating. This aquatic plant has one to three leaves (or fronds) and is about 0.15cm to 0.30cm in length. A single root-hair protrudes from each frond and the weed tends to grow in dense colonies in relatively still water. The majority may have tiny roots; however it is essentially a very basic green sphere. ‘Researchers are using these plants to study basic plant development, plant biochemistry, photosynthesis, the toxicity of hazardous substances, and much more.  Genetic engineers are cloning duckweed genes and modifying duckweeds to inexpensively produce pharmaceuticals, whilst environmental scientists are using duckweeds to remove unwanted substances from water. Finally, Aquaculturalists find them an inexpensive feed source for fish farming due to their abound nature.’(J.Cross,2012).

Although partially seen as a ‘water purifier of untapped efficiency’, (due to its ability to effectively absorb numerous excess nutrients, most notably Nitrate and Phosphorus), they have become an eyesore upon the countless areas of water that populate the Australian geographic. In addition, the density of the weed upon the surface of the water has caused a large number of cases resulting in the reduction of fish living in the same environment, due to low oxygen levels, (Duckweed, if left to multiply, can block the sun, therefore the oxygen,...
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