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

FindBook

Google Book

Amazon

博客來

Effects of Environmental Factors on Intraspecific Genetic Diversity of a Foundation Plant Species and the Extended Ecological Consequences.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Effects of Environmental Factors on Intraspecific Genetic Diversity of a Foundation Plant Species and the Extended Ecological Consequences./
作者:	Tomasula, Jewel.
面頁冊數:	1 online resource (153 pages)
附註:	Source: Dissertations Abstracts International, Volume: 84-11, Section: B.
Contained By:	Dissertations Abstracts International84-11B.
標題:	Ecology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30420995click for full text (PQDT)
ISBN:	9798379448097

Effects of Environmental Factors on Intraspecific Genetic Diversity of a Foundation Plant Species and the Extended Ecological Consequences.
Tomasula, Jewel.

Effects of Environmental Factors on Intraspecific Genetic Diversity of a Foundation Plant Species and the Extended Ecological Consequences. - 1 online resource (153 pages)

Source: Dissertations Abstracts International, Volume: 84-11, Section: B.

Thesis (Ph.D.)--Georgetown University, 2023.

Includes bibliographical references

Global change pressures increase environmental stress on natural ecosystems and lead to biodiversity loss. In Chapter 1, I reviewed how different global change pressures impact marine coastal ecosystems (e.g., salt marshes), with focus on the effects on insects. While several pressures directly impact insect herbivores and their predators, anthropogenic nutrient inputs into coastal ecosystems impact them indirectly through the foundation plant species population. Then, in a field experiment (Chapter 2), I investigated which conditions of nutrient enrichment led to salt marsh ecological collapse (i.e., salt marsh dieback). Chronic, high nutrient enrichment increased stem-boring insect larval density to levels that caused salt marsh dieback at the plot scale. Because S. alterniflora is a foundation plant species, its genetic diversity may explain variation in ecological responses to nutrient enrichment. In Chapter 3, I used microsatellite DNA markers to genotype plants collected from transects that spanned the inland habitat edge and tidal creek edge. I found natural environmental factors did not affect S. alterniflora spatial genetic patterns, and instead neutral mechanisms more likely explain them. To test how S. alterniflora responds to varying levels of genetic diversity and nutrient enrichment, I conducted a greenhouse experiment (Chapter 4). Importantly, belowground biomass significantly decreased under conditions of low genetic diversity and high nutrient inputs, which may help explain variation in salt marsh dieback found in previous studies. Finally, I tested arthropod food web responses to both nutrient enrichment and S. alterniflora genetic diversity by setting up fifty common garden plots in a two-year field experiment (Chapter 5). My findings revealed that both nutrient enrichment and plant genetic diversity structured arthropod community composition after one year of nutrient addition (pulse), but after two years (press) only the effect of nutrient enrichment persisted. Through my dissertation research I determined which S. alterniflora responses to nutrient enrichment are mediated by genetic diversity, and which are not, and the consequences of these varying responses for the salt marsh ecosystem. Broadly, my work demonstrates how natural levels of intraspecific genetic diversity within a foundation plant species population influence ecological responses to global change pressures.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2023

Mode of access: World Wide Web

ISBN: 9798379448097Subjects--Topical Terms:

516476
Ecology.
Subjects--Index Terms:

BiodiversityIndex Terms--Genre/Form:

542853
Electronic books.

Effects of Environmental Factors on Intraspecific Genetic Diversity of a Foundation Plant Species and the Extended Ecological Consequences.
LDR:03892nmm a2200409K 4500 001 2359414
005 20230917193942.5
006 m o d
007 cr mn ---uuuuu
008 241011s2023 xx obm 000 0 eng d
020 $a 9798379448097
035 $a (MiAaPQ)AAI30420995
035 $a AAI30420995
040 $a MiAaPQ $b eng $c MiAaPQ $d NTU
100 1 $a Tomasula, Jewel. $3 3700014
245 1 0 $a Effects of Environmental Factors on Intraspecific Genetic Diversity of a Foundation Plant Species and the Extended Ecological Consequences.
264 0 $c 2023
300 $a 1 online resource (153 pages)
336 $a text $b txt $2 rdacontent
337 $a computer $b c $2 rdamedia
338 $a online resource $b cr $2 rdacarrier
500 $a Source: Dissertations Abstracts International, Volume: 84-11, Section: B.
500 $a Advisor: Wimp, Gina.
502 $a Thesis (Ph.D.)--Georgetown University, 2023.
504 $a Includes bibliographical references
520 $a Global change pressures increase environmental stress on natural ecosystems and lead to biodiversity loss. In Chapter 1, I reviewed how different global change pressures impact marine coastal ecosystems (e.g., salt marshes), with focus on the effects on insects. While several pressures directly impact insect herbivores and their predators, anthropogenic nutrient inputs into coastal ecosystems impact them indirectly through the foundation plant species population. Then, in a field experiment (Chapter 2), I investigated which conditions of nutrient enrichment led to salt marsh ecological collapse (i.e., salt marsh dieback). Chronic, high nutrient enrichment increased stem-boring insect larval density to levels that caused salt marsh dieback at the plot scale. Because S. alterniflora is a foundation plant species, its genetic diversity may explain variation in ecological responses to nutrient enrichment. In Chapter 3, I used microsatellite DNA markers to genotype plants collected from transects that spanned the inland habitat edge and tidal creek edge. I found natural environmental factors did not affect S. alterniflora spatial genetic patterns, and instead neutral mechanisms more likely explain them. To test how S. alterniflora responds to varying levels of genetic diversity and nutrient enrichment, I conducted a greenhouse experiment (Chapter 4). Importantly, belowground biomass significantly decreased under conditions of low genetic diversity and high nutrient inputs, which may help explain variation in salt marsh dieback found in previous studies. Finally, I tested arthropod food web responses to both nutrient enrichment and S. alterniflora genetic diversity by setting up fifty common garden plots in a two-year field experiment (Chapter 5). My findings revealed that both nutrient enrichment and plant genetic diversity structured arthropod community composition after one year of nutrient addition (pulse), but after two years (press) only the effect of nutrient enrichment persisted. Through my dissertation research I determined which S. alterniflora responses to nutrient enrichment are mediated by genetic diversity, and which are not, and the consequences of these varying responses for the salt marsh ecosystem. Broadly, my work demonstrates how natural levels of intraspecific genetic diversity within a foundation plant species population influence ecological responses to global change pressures.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2023
538 $a Mode of access: World Wide Web
650 4 $a Ecology. $3 516476
650 4 $a Genetics. $3 530508
650 4 $a Plant sciences. $3 3173832
653 $a Biodiversity
653 $a Nutrient enrichment
653 $a Genetic diversity
653 $a Insects
653 $a Salt marsh
653 $a Spartina alterniflora
655 7 $a Electronic books. $2 lcsh $3 542853
690 $a 0329
690 $a 0369
690 $a 0479
710 2 $a ProQuest Information and Learning Co. $3 783688
710 2 $a Georgetown University. $b Biology. $3 1675584
773 0 $t Dissertations Abstracts International $g 84-11B.
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30420995 $z click for full text (PQDT)