The effect of environmental fluctuations on the invasion success of bacterial invader Serratia marcescens

Ilmastonmuutoksen on odotettu lisäävän ympäristöolosuhteissa tapahtuvien vaihteluiden määrää. Teorian mukaan nämä vaihtelut voisivat lisätä vieraslajien levittäytymistä uusille alueille, mikäli ne vaikuttavat ekologisiin ja evolutiivisiin prosesseihin, jotka tekevät lajeista menestyksekkäitä vierasl...

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Päätekijä: Räsänen, Emmi
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: 2017
Aiheet:
Linkit: https://jyx.jyu.fi/handle/123456789/57119
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author Räsänen, Emmi
author2 Matemaattis-luonnontieteellinen tiedekunta Faculty of Sciences Bio- ja ympäristötieteiden laitos Department of Biological and Environmental Science University of Jyväskylä Jyväskylän yliopisto
author_facet Räsänen, Emmi Matemaattis-luonnontieteellinen tiedekunta Faculty of Sciences Bio- ja ympäristötieteiden laitos Department of Biological and Environmental Science University of Jyväskylä Jyväskylän yliopisto Räsänen, Emmi Matemaattis-luonnontieteellinen tiedekunta Faculty of Sciences Bio- ja ympäristötieteiden laitos Department of Biological and Environmental Science University of Jyväskylä Jyväskylän yliopisto
author_sort Räsänen, Emmi
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description Ilmastonmuutoksen on odotettu lisäävän ympäristöolosuhteissa tapahtuvien vaihteluiden määrää. Teorian mukaan nämä vaihtelut voisivat lisätä vieraslajien levittäytymistä uusille alueille, mikäli ne vaikuttavat ekologisiin ja evolutiivisiin prosesseihin, jotka tekevät lajeista menestyksekkäitä vieraslajeja sekä paikallisista eliöyhteisöistä ja ympäristöistä alttiimpia levittäytymiselle. Häiriöherkkien alueiden on oletettu olevan otollisia levittäytymiselle, minkä lisäksi vieraslajit ovat voineet valmiiksi sopeutua sietämään vaihtelevia olosuhteita alkuperäisalueellaan. Nopeasti vaihtelevissa ympäristöolosuhteissa luonnonvalinta voi suosia ominaisuuksia, kuten generalismia, joka auttaa eliöitä sopeutumaan monenlaisiin ympäristöihin. Nämä ominaisuudet voivat johtaa vieraslajin parempaan kilpailukykyyn alkuperäislajeja vastaan, varsinkin jos alkuperäislajit eivät ole sopeutuneet sietämään ympäristön vaihtelua. Lisäksi vieraslajien on oletettu menestyvän paremmin niiden ollessa kaukaisempaa sukua alkuperäislajeille ja sen vuoksi kilpailevan vähemmän samoista resursseista. Tässä tutkimuksessa tarkoituksenani oli testata edellä mainittuja teorioita ja löytää ilmiöitä, jotka olisivat yleistettävissä kaikille tutkimuslajeille. Tutkimuksessani levittäytymismenestys tarkoitti vieraslajipopulaation kykyä syrjäyttää sitä vastaan kilpailevan lajin populaatio. Bakteerilajeja, joiden populaatiot olivat kehittyneet joko tasaisessa tai vaihtelevassa lämpötilassa kilpailutettiin Serratia marcescens vieraslajibakteeria vastaan, jonka populaatiot olivat myös kehittyneet joko tasaisessa tai vaihtelevassa lämpötilassa, ja lämpötila levittäytymisen aikana oli samalla tavoin joko tasainen tai vaihteleva. Lisäksi kilpailijalajit olivat vaihtelevissa määrin sukua vieraslajille. Kokeen tulokset osoittautuivat herkiksi kilpailijalajin identiteetille, mikä saattoi johtua voimakkaammasta kilpailusta läheistä sukua olevien lajien välillä. Useimpien lajien tapauksessa vaihteleva lämpötila levittäytymisen aikana kasvatti vieraslajin menestystä. Yllättäen vieraslajin kehitys vaihtelevassa lämpötilassa ei parantanut merkitsevästi sen levittäytymismenestystä. Sen sijaan vaihtelevassa lämpötilassa luonnonvalinta voisi mahdollisesti valita generalisteja, jotka menestyvät hyvin myös epäoptimaalisissa olosuhteissa. S. marcescens menestyi parhaiten myös silloin, kun sen kilpailijalaji ei ollut sopeutunut sietämään lämpötilavaihtelua, mutta tähän tulokseen yhdellä kilpailijalajeista oli vahva vaikutus. Tulosteni perusteella tulisi tulevaisuudessa sekä vieraslajin että sen paikallisten kilpailijoiden ja levittäytymisen aikaisen ympäristön ominaisuudet huomioida yhdessä, kun halutaan ennustaa vieraslajien menestystä vaihtelevissa olosuhteissa. The global climate change is presumed to increase the amount of fluctuations in the environmental conditions. According to the theory, this could increase the amount of species invasion into new areas if fluctuations affect the ecological and evolutionary processes that make species successful as invaders, and native communities and their environments more susceptible to invasions. Disturbed environments are assumed to be more prone to invasions and the fluctuations in invasive species’ home range could pre-adapt them to tolerate similar conditions elsewhere. Under fluctuating conditions, natural selection could potentially favor traits like generalism, which is profitable in adaptation to wide range of conditions. These attributes could lead to better competitive ability of the invader against the native species, especially if the native species are mal-adapted to tolerate fluctuating conditions. Moreover, the distant relatedness between the invasive species and its native competitors is hypothesized to reduce their competition for the same resources and so increase the success of the invader. I tested these theories of how fast environmental fluctuations and relatedness of species could affect the invasion success, with my aim to find effects that would be generalizable over the species. In this study, the invasion success meant the ability of the invader population to competitively displace the population of its competitor species. Bacterial species that had evolved in stable or fluctuating temperature were competed against the dominant bacterial invader Serratia marcescens, which had also evolved in stable or fluctuating temperature and the invasions were initiated in environments with similarly stable or fluctuating temperature. In addition, the competitor species were differently related to the invader. My results indicated strong species-specific effects on invasion success, which could be due to the more intense competition detected between closely related species. For most of the species, the rapid temperature fluctuations during invasion made invasions more successful. Unexpectedly, the evolution in the fluctuating environment did not significantly enhance the success of S. marcescens. Instead, my study showed that under fast fluctuations, natural selection could select for generalist genotypes, which invade better also in suboptimal environments. I found the superiority of S. marcescens also when its competitor species had mal-adapted to tolerate thermal fluctuations, but this result was strongly affected by one species. Overall, my results indicate that in the future, the traits of the invader, the attributes of its native competitors and the environmental conditions during invasion need to be considered together when predicting the success of the invasive species under fluctuating conditions.
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Teorian mukaan n\u00e4m\u00e4 vaihtelut voisivat lis\u00e4t\u00e4 vieraslajien levitt\u00e4ytymist\u00e4 uusille alueille, mik\u00e4li ne vaikuttavat ekologisiin ja evolutiivisiin prosesseihin, jotka tekev\u00e4t lajeista menestyksekk\u00e4it\u00e4 vieraslajeja sek\u00e4 paikallisista eli\u00f6yhteis\u00f6ist\u00e4 ja ymp\u00e4rist\u00f6ist\u00e4 alttiimpia levitt\u00e4ytymiselle. H\u00e4iri\u00f6herkkien alueiden on oletettu olevan otollisia levitt\u00e4ytymiselle, mink\u00e4 lis\u00e4ksi vieraslajit ovat voineet valmiiksi sopeutua siet\u00e4m\u00e4\u00e4n vaihtelevia olosuhteita alkuper\u00e4isalueellaan. Nopeasti vaihtelevissa ymp\u00e4rist\u00f6olosuhteissa luonnonvalinta voi suosia ominaisuuksia, kuten generalismia, joka auttaa eli\u00f6it\u00e4 sopeutumaan monenlaisiin ymp\u00e4rist\u00f6ihin. N\u00e4m\u00e4 ominaisuudet voivat johtaa vieraslajin parempaan kilpailukykyyn alkuper\u00e4islajeja vastaan, varsinkin jos alkuper\u00e4islajit eiv\u00e4t ole sopeutuneet siet\u00e4m\u00e4\u00e4n ymp\u00e4rist\u00f6n vaihtelua. Lis\u00e4ksi vieraslajien on oletettu menestyv\u00e4n paremmin niiden ollessa kaukaisempaa sukua alkuper\u00e4islajeille ja sen vuoksi kilpailevan v\u00e4hemm\u00e4n samoista resursseista. T\u00e4ss\u00e4 tutkimuksessa tarkoituksenani oli testata edell\u00e4 mainittuja teorioita ja l\u00f6yt\u00e4\u00e4 ilmi\u00f6it\u00e4, jotka olisivat yleistett\u00e4viss\u00e4 kaikille tutkimuslajeille. Tutkimuksessani levitt\u00e4ytymismenestys tarkoitti vieraslajipopulaation kyky\u00e4 syrj\u00e4ytt\u00e4\u00e4 sit\u00e4 vastaan kilpailevan lajin populaatio. Bakteerilajeja, joiden populaatiot olivat kehittyneet joko tasaisessa tai vaihtelevassa l\u00e4mp\u00f6tilassa kilpailutettiin Serratia marcescens vieraslajibakteeria vastaan, jonka populaatiot olivat my\u00f6s kehittyneet joko tasaisessa tai vaihtelevassa l\u00e4mp\u00f6tilassa, ja l\u00e4mp\u00f6tila levitt\u00e4ytymisen aikana oli samalla tavoin joko tasainen tai vaihteleva. Lis\u00e4ksi kilpailijalajit olivat vaihtelevissa m\u00e4\u00e4rin sukua vieraslajille. Kokeen tulokset osoittautuivat herkiksi kilpailijalajin identiteetille, mik\u00e4 saattoi johtua voimakkaammasta kilpailusta l\u00e4heist\u00e4 sukua olevien lajien v\u00e4lill\u00e4. Useimpien lajien tapauksessa vaihteleva l\u00e4mp\u00f6tila levitt\u00e4ytymisen aikana kasvatti vieraslajin menestyst\u00e4. Yll\u00e4tt\u00e4en vieraslajin kehitys vaihtelevassa l\u00e4mp\u00f6tilassa ei parantanut merkitsev\u00e4sti sen levitt\u00e4ytymismenestyst\u00e4. 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Moreover, the distant relatedness between the invasive species and its native competitors is hypothesized to reduce their competition for the same resources and so increase the success of the invader. I tested these theories of how fast environmental fluctuations and relatedness of species could affect the invasion success, with my aim to find effects that would be generalizable over the species. In this study, the invasion success meant the ability of the invader population to competitively displace the population of its competitor species. Bacterial species that had evolved in stable or fluctuating temperature were competed against the dominant bacterial invader Serratia marcescens, which had also evolved in stable or fluctuating temperature and the invasions were initiated in environments with similarly stable or fluctuating temperature. In addition, the competitor species were differently related to the invader. 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spellingShingle Räsänen, Emmi The effect of environmental fluctuations on the invasion success of bacterial invader Serratia marcescens Bakteeri Evoluutio Fylogeneettinen etäisyys Ilmastonmuutos Kilpailu Lämpötilan vaihtelu Vieraslaji Ekologia ja evoluutiobiologia Ecology and evolutionary biology 4011 bakteerit evoluutio fylogenetiikka ilmastonmuutokset kilpailu lämpötila vieraslajit
title The effect of environmental fluctuations on the invasion success of bacterial invader Serratia marcescens
title_full The effect of environmental fluctuations on the invasion success of bacterial invader Serratia marcescens
title_fullStr The effect of environmental fluctuations on the invasion success of bacterial invader Serratia marcescens The effect of environmental fluctuations on the invasion success of bacterial invader Serratia marcescens
title_full_unstemmed The effect of environmental fluctuations on the invasion success of bacterial invader Serratia marcescens The effect of environmental fluctuations on the invasion success of bacterial invader Serratia marcescens
title_short The effect of environmental fluctuations on the invasion success of bacterial invader Serratia marcescens
title_sort effect of environmental fluctuations on the invasion success of bacterial invader serratia marcescens
title_txtP The effect of environmental fluctuations on the invasion success of bacterial invader Serratia marcescens
topic Bakteeri Evoluutio Fylogeneettinen etäisyys Ilmastonmuutos Kilpailu Lämpötilan vaihtelu Vieraslaji Ekologia ja evoluutiobiologia Ecology and evolutionary biology 4011 bakteerit evoluutio fylogenetiikka ilmastonmuutokset kilpailu lämpötila vieraslajit
topic_facet 4011 Bakteeri Ecology and evolutionary biology Ekologia ja evoluutiobiologia Evoluutio Fylogeneettinen etäisyys Ilmastonmuutos Kilpailu Lämpötilan vaihtelu Vieraslaji bakteerit evoluutio fylogenetiikka ilmastonmuutokset kilpailu lämpötila vieraslajit
url https://jyx.jyu.fi/handle/123456789/57119 http://www.urn.fi/URN:NBN:fi:jyu-201802191537
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