Lemna Essays

Duckweed is one of the smallest flowering aquatic plants and is present in fresh water or wetland habitats. Though it looks mundane, there is an intricate biological mechanism which is affected by factors such as limiting factors, carrying capacity, logistic and exponential population growth, density dependent and density independent limiting factors, competition, interspecific and intraspecific competition, and optimal growth conditions. All of these will be discussed in this essay to understand

“Wolffia : pH 4-5;0-10” 2. “Lemna : pH 4-6;2-10” 3. “Spirodela : pH 3-7;0-10” Certain elements such as the 2nd degree equation and the 5th degree equation are needed in order to describe the rate of growth of the different species of duck weed along the pH gradient http://www.researchgate.net/publication/234009001_the_effect_of_pH_on_the_population_growth_of_species_of_duckweed_Spirodela_oligorrhiza_LLemna_minor_and_Wolffia_arrhiza Source 2 : Lemna (Duckweed) as an indicator of water

In this six week lab we discovered many important things. We found that most of the acidic pH levels quickly killed the duckweed along with most of the alkaline pH level liquids. With the alkaline levels of pH we found that soap and bleach did kill the duckweed fairly fast and killed all of the living organisms within the water and on the duckweed. With the acid levels of pH we discovered that the duckweed and living organisms were also killed quite quickly in the liquids coffee and lemon juice

Classification Common Name - Yellow Tongued Duckweed Frog Scientific Name - Lithobates Lemna Kingdom - Animalia. The Yellow Tongued Duckweed Frog descended from the Green Frog. Both of these frog species are part of the Animalia Kingdom. They are heterotrophs, they depend on other organisms directly or indirectly for food. Phylum - Chordata. The Yellow Tongued Duckweed Frog belongs to the Phylum Chordata. All chordates have something in common, which is their main feature, the notochord

N. Dirilgen, 1994, Cobalt-copper and Cobalt-zinc effects on duckweed growth and metal accumulation. Different concentrations of Cobalt2+, Zinc2+ and Copper2+ as well as Co2+Cu2+ and Co2+Zn2+ were added to nutrients given to a species of duckweed, Lemna minor L. the effects of these metals on the growth of the duckweed was recorded. A change in growth was not very noticeable until the concentration of Cobalt (Co) and Copper (Cu) reached 2.00 ppm (parts per million), where the growth of the duckweed

Introduction: All living organisms require oxygen to grow. Daphnia magna and Lemna minor (also known as Duckweed in its most common form) are no exceptions to this rule. Fertilizer is used to help plants, like Lemna minor grow. Plants give off the oxygen that other organisms, such as Daphnia magna, need. However, over-oxygenated environments can cause excess in the plant life. For example, algal blooms can lead to a reduction in the amount of light that can make it through the water (Rice University

is a small free floating aquatic perennial (Briggs, 1925). They are made up of a small leaf usually smaller than 5 mm, dependant on the species, which float on stagnant or slow moving water in groups of two or three, or individually (Gifford 2004). Lemna Minor was used in this experiment. They are usually seen in late spring to autumn, although some species remain green throughout the winter, while still more form a turion underwater in winter months and surface again in spring (Guha, 1997). They reproduce

A report on the effects of Lead and different pH levels on Lemna minor, which is a species of duckweed. The pH of water influences the forms of metals and metal oxide in aquatic systems. This is because pH controls solubility of metals as well as concentration. Decreasing the pH of a solution causes an increase in the free metal ion concentration of the solution. Due to this fact, it was stated that metals in acidic waters have more of a chance of being toxic than metals in neutral water. An experiment

• Duckweed (Lemna minor) is a member of the Lemnaceae family (Monette et al. 2006) it is a small plant that floats on the surface of still or stagnant water that is usually rich in nutrients (Keddy 2010). It was seen that Duckweed thrived in areas of high nutrient content, high sunlight and warmer temperatures (Taylor 2011) .It was also seen that fertilisers contained nutrients, such as nitrates, which greatly influences duckweed growth. Duckweed is also used for feed for farm animal, such as ducks

Analysis, Discussion and Interpretation of Findings: As can be seen on the first graph, a general gradual decreasing trend in the concentration of nitrates can be observed in each of the trays excepting the control (with A experiencing a decrease of 8mg/l, B 10mg/l, C being the control remained the same, D 7mg/l and E 9mg/l respectively). Since the nitrate concentration in the control remained unaffected at around 40ml, any possible external causes of nitrate removal, other than the duckweed itself