Growth and competition of Flavobacterium columnare strains in two different nutrient levels

Human influence on the environment has led to changes in ecological factors which have greatly contributed to the emergence of different infectious diseases. The introduction of parasites in a new or changed environment can cause mass mortalities in their hosts. However, the reasons for disease outb...

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Päätekijä: Nkembeng, Aloysius
Muut tekijät: Matemaattis-luonnontieteellinen tiedekunta, Faculty of Sciences, Bio- ja ympäristötieteiden laitos, Department of Biological and Environmental Science, University of Jyväskylä, Jyväskylän yliopisto
Aineistotyyppi: Pro gradu
Kieli:eng
Julkaistu: 2016
Aiheet:
Linkit: https://jyx.jyu.fi/handle/123456789/51842
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author Nkembeng, Aloysius
author2 Matemaattis-luonnontieteellinen tiedekunta Faculty of Sciences Bio- ja ympäristötieteiden laitos Department of Biological and Environmental Science University of Jyväskylä Jyväskylän yliopisto
author_facet Nkembeng, Aloysius Matemaattis-luonnontieteellinen tiedekunta Faculty of Sciences Bio- ja ympäristötieteiden laitos Department of Biological and Environmental Science University of Jyväskylä Jyväskylän yliopisto Nkembeng, Aloysius Matemaattis-luonnontieteellinen tiedekunta Faculty of Sciences Bio- ja ympäristötieteiden laitos Department of Biological and Environmental Science University of Jyväskylä Jyväskylän yliopisto
author_sort Nkembeng, Aloysius
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description Human influence on the environment has led to changes in ecological factors which have greatly contributed to the emergence of different infectious diseases. The introduction of parasites in a new or changed environment can cause mass mortalities in their hosts. However, the reasons for disease outbreaks caused by pathogens are not quite clear, i.e., whether they are caused by changes in epidemiology or evolution of pathogens or both. One factor that can affect the growth of pathogens is nutrient availability. This effect can be different between virulent and avirulent strains due to the influence the available nutrients have on their growth and virulence. Intensive fish farming has created a nutrient rich environment that may favor the growth of pathogens. The objective of this study was to investigate how different nutrient levels will influence the growth of virulent and avirulent strains of Flavobacterium columnare when grown individually as monocultures or together in competition. This study was based on the hypothesis that virulent strain grows better and outcompetes the avirulent strain when nutrient availability is high. However, due to high nutrient requirements it cannot outcompete avirulent strain when nutrient availability is low. It was shown that in both high and low nutrient availability the virulent strain outcompeted the avirulent strain. In competition, it is possible that the virulent strain can grow at lower concentration of limiting nutrient and outcompete the avirulent strain. The results suggest that virulent strains can grow better than avirulent strains both in natural environment where nutrient level is low or in nutrient rich environment, for example at fish farms.
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spellingShingle Nkembeng, Aloysius Growth and competition of Flavobacterium columnare strains in two different nutrient levels Batch culture chemostat culture quantitative polymerase chain reaction (qPCR) virulence Akvaattiset tieteet Aquatic sciences 4012 loiset taudinaiheuttajat virulenssi kasvu ravinteet
title Growth and competition of Flavobacterium columnare strains in two different nutrient levels
title_full Growth and competition of Flavobacterium columnare strains in two different nutrient levels
title_fullStr Growth and competition of Flavobacterium columnare strains in two different nutrient levels Growth and competition of Flavobacterium columnare strains in two different nutrient levels
title_full_unstemmed Growth and competition of Flavobacterium columnare strains in two different nutrient levels Growth and competition of Flavobacterium columnare strains in two different nutrient levels
title_short Growth and competition of Flavobacterium columnare strains in two different nutrient levels
title_sort growth and competition of flavobacterium columnare strains in two different nutrient levels
title_txtP Growth and competition of Flavobacterium columnare strains in two different nutrient levels
topic Batch culture chemostat culture quantitative polymerase chain reaction (qPCR) virulence Akvaattiset tieteet Aquatic sciences 4012 loiset taudinaiheuttajat virulenssi kasvu ravinteet
topic_facet 4012 Akvaattiset tieteet Aquatic sciences Batch culture chemostat culture kasvu loiset quantitative polymerase chain reaction (qPCR) ravinteet taudinaiheuttajat virulence virulenssi
url https://jyx.jyu.fi/handle/123456789/51842 http://www.urn.fi/URN:NBN:fi:jyu-201611084591
work_keys_str_mv AT nkembengaloysius growthandcompetitionofflavobacteriumcolumnarestrainsintwodifferentnutrientlevel