Winoblog

Winogradsky column lab page!

Welcome to the Winogradsky column lab page! Students from the Departments of Biological Applications and Technology, University of Ioannina and Icthyology and Aquatic Environment, University of Thessaly, Greece and the Microbiology course, Faculty of Sciences, University of Cádiz, Spain, discuss their findings on Winogradsky columns they constructed!

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Bienvenidos a la pagina web de los Winobloggers! Aquí los estudiantes y profesores de dos departamentos griegos, el Departamento de Aplicaciones y Tecnologías Biológicas de la Universidad de Ioannina y el Departmento de Agricultura, Ictiología y Sistemas Acuáticos de la Universidad de Thessalia, junto con los estudiantes de Microbiología de la Facultad de Ciencias en la Universidad de Cádiz, se reúnen para observar, comentar, preguntar y responder a preguntas relacionadas con nuestro experimento, la columna Winogradsky.

Friday, 11 November 2016

STUDENTS:NENA KOUKOUGELI
DIMITRA-IOLI SKOUROLIAKOU
UNIVERSITY OF IOANNINA GREECE
BIOLOGICAL APLICATIONS AND TECHNOLOGY
AQUATIC MICROORGANISMS

WEEK: 3rd

LEFT: control

RIGHT:warmth-exposed

From the 2nd to the 3rd week, there are only minor differences between the two columns ( control and warmth-exposed columns ). The water continues to be clear, when the sludge has been sedimented, but still, it is not observed any stratification in the sludge from the microorganisms. The change that has been observed refers to the color of the column. The sludge has obtained a darker color, as a result of the reduction of oxygen, the accumulation of organic mater which comes from the yolk, the grass and the ivertebrates such as anelidas and the eventual domination of anoxic conditions. Only the very top of the column remains aerated, because of the low rated diffusion of oxygen in the water. As a result, the light green color that appears in the water, indicates the remaining existance of phytoplankton. As in the previews week, so this time, the distention of the membrane on the top of each bottle was obvious. Apart from that, this week, when we moved the columns in order to photograph them, bubbles started to emerge. This, proves the existance and the increase of Archaea, and more precisely the increase in the amount of methanogens.

In conclusion, the most noticeable difference from the 1st week, is about the color of the coloumns, which refers to the reduction of oxygen and the domination of anoxic conditions.

Hypothesis: The rapid fluctuation of the temperature on daily basis, reduces the growth rate of the microorganisms in the 2nd Winogradsky column (warmth - exposed column).