東華大學圖書館 |

語系: 繁體中文

說明(常見問題)

回圖書館首頁

手機版館藏查詢

登入

回首頁

切換: 標籤 | MARC模式 | ISBD

Impact of Environmental Disturbances...

Chaudhary, Adit.

FindBook

Google Book

Amazon

博客來

Impact of Environmental Disturbances on Aquatic Microbial Community Structure and Function.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Impact of Environmental Disturbances on Aquatic Microbial Community Structure and Function./
作者:	Chaudhary, Adit.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2021,
面頁冊數:	174 p.
附註:	Source: Dissertations Abstracts International, Volume: 83-02, Section: B.
Contained By:	Dissertations Abstracts International83-02B.
標題:	Ecology. -
電子資源:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28722719
ISBN:	9798534686289

Impact of Environmental Disturbances on Aquatic Microbial Community Structure and Function.
Chaudhary, Adit.

Impact of Environmental Disturbances on Aquatic Microbial Community Structure and Function. - Ann Arbor : ProQuest Dissertations & Theses, 2021 - 174 p.

Source: Dissertations Abstracts International, Volume: 83-02, Section: B.

Thesis (Ph.D.)--University of Illinois at Chicago, 2021.

This item must not be sold to any third party vendors.

Despite their small share of Earth's surface, freshwater ecosystems contribute significantly to regional and global carbon budgets. Bacterial communities in these ecosystems play a fundamental role in the the biogeochemical flux and food web dynamics. However, our understanding of how aquatic bacterial communities respond to changes in nutrient regimes and substrate availability arising from perturbations in their environment is limited. My research described herein focuses on investigating the impact of environmental disturbances on bacterial community dynamics in regionally important aquatic ecosystems. First, an evaluation of short-term impacts of stormflow events on the bacterial community of a highly urbanized stream of the Chicago Area Waterways (CAWS) was performed. Using 16S rRNA gene sequencing and metagenomics, assessment of the stream bacterial community composition and functional potential during dry and wet weather demonstrated the influence of increased wastewater treatment plant effluent flow following rain in shifting the stream bacterial community from abundant freshwater taxa to those more associated with anthropogenic settings. Shifts in taxonomic composition were also linked to changes in the functional gene content. Next, I evaluated bacterial community dynamics and carbon metabolism in southern Lake Michigan in light of the of the recent ecological changes in the lake due to the invasive dreissenid mussels. Bacterial community diversity, gene content and gene expression patterns in nearshore and offshore Lake Michigan and community response to a pulse of terrestrially derived DOM (t-DOM) was investigated using metagenomics and metatranscriptomics. Results highlighted overall similarities in the bacterial communities of the oligotrophic offshore and the more productive nearshore, except for differences in the relative abundance of genes/gene transcripts affiliated with Cyanobacteria and the taxonomic composition of DOM transporter gene transcripts. However, both nearshore and offshore bacterial communities responded similarly to the t-DOM pulse, in the form of increased transcription for aromatic compound metabolism. Overall, the results of these studies demonstrate sensitivity of aquatic bacterial community structure and gene content to short-term perturbations as seen in CAWS, but a potential resilience in community function (carbon metabolism) to long-term stressors such as the invasive mussels in Lake Michigan.

ISBN: 9798534686289Subjects--Topical Terms:

516476
Ecology.
Subjects--Index Terms:

Freshwater

Impact of Environmental Disturbances on Aquatic Microbial Community Structure and Function.
LDR:03848nmm a2200445 4500 001 2281684
005 20210920103617.5
008 220723s2021 ||||||||||||||||| ||eng d
020 $a 9798534686289
035 $a (MiAaPQ)AAI28722719
035 $a (MiAaPQ)0799vireo2557Chaudhary
035 $a AAI28722719
040 $a MiAaPQ $c MiAaPQ
100 1 $a Chaudhary, Adit. $3 3560369
245 1 0 $a Impact of Environmental Disturbances on Aquatic Microbial Community Structure and Function.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2021
300 $a 174 p.
500 $a Source: Dissertations Abstracts International, Volume: 83-02, Section: B.
500 $a Advisor: Poretsky, Rachel.
502 $a Thesis (Ph.D.)--University of Illinois at Chicago, 2021.
506 $a This item must not be sold to any third party vendors.
520 $a Despite their small share of Earth's surface, freshwater ecosystems contribute significantly to regional and global carbon budgets. Bacterial communities in these ecosystems play a fundamental role in the the biogeochemical flux and food web dynamics. However, our understanding of how aquatic bacterial communities respond to changes in nutrient regimes and substrate availability arising from perturbations in their environment is limited. My research described herein focuses on investigating the impact of environmental disturbances on bacterial community dynamics in regionally important aquatic ecosystems. First, an evaluation of short-term impacts of stormflow events on the bacterial community of a highly urbanized stream of the Chicago Area Waterways (CAWS) was performed. Using 16S rRNA gene sequencing and metagenomics, assessment of the stream bacterial community composition and functional potential during dry and wet weather demonstrated the influence of increased wastewater treatment plant effluent flow following rain in shifting the stream bacterial community from abundant freshwater taxa to those more associated with anthropogenic settings. Shifts in taxonomic composition were also linked to changes in the functional gene content. Next, I evaluated bacterial community dynamics and carbon metabolism in southern Lake Michigan in light of the of the recent ecological changes in the lake due to the invasive dreissenid mussels. Bacterial community diversity, gene content and gene expression patterns in nearshore and offshore Lake Michigan and community response to a pulse of terrestrially derived DOM (t-DOM) was investigated using metagenomics and metatranscriptomics. Results highlighted overall similarities in the bacterial communities of the oligotrophic offshore and the more productive nearshore, except for differences in the relative abundance of genes/gene transcripts affiliated with Cyanobacteria and the taxonomic composition of DOM transporter gene transcripts. However, both nearshore and offshore bacterial communities responded similarly to the t-DOM pulse, in the form of increased transcription for aromatic compound metabolism. Overall, the results of these studies demonstrate sensitivity of aquatic bacterial community structure and gene content to short-term perturbations as seen in CAWS, but a potential resilience in community function (carbon metabolism) to long-term stressors such as the invasive mussels in Lake Michigan.
590 $a School code: 0799.
650 4 $a Ecology. $3 516476
650 4 $a Microbiology. $3 536250
650 4 $a Environmental science. $3 677245
650 4 $a Genetics. $3 530508
650 4 $a Water resources management. $3 794747
650 4 $a Mollusks. $2 fast $3 2109455
650 4 $a Algae. $3 546231
650 4 $a Aquatic ecosystems. $3 3560371
650 4 $a Rivers. $3 519737
650 4 $a Rain. $3 3560372
653 $a Freshwater
653 $a Bacterial community
653 $a Metagenomics
653 $a Metatranscriptomics
653 $a Dissolved organic matter
653 $a Lake Michigan
653 $a Stormflow
653 $a Urban rivers
690 $a 0410
690 $a 0329
690 $a 0768
690 $a 0369
690 $a 0595
710 2 $a University of Illinois at Chicago. $b Biological Sciences. $3 3560370
773 0 $t Dissertations Abstracts International $g 83-02B.
790 $a 0799
791 $a Ph.D.
792 $a 2021
793 $a English
856 4 0 $u https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28722719