東華大學圖書館 |

Language: English

Help

回圖書館首頁

手機版館藏查詢

Back

Switch To: Labeled | MARC Mode | ISBD

Responses of native Hawaiian calcify...

Hart, Kendra M.

Linked to FindBook

Google Book

Amazon

博客來

Responses of native Hawaiian calcifying macroalgae to naturally occurring ocean acidification conditions.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Responses of native Hawaiian calcifying macroalgae to naturally occurring ocean acidification conditions./
Author:	Hart, Kendra M.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2016,
Description:	59 p.
Notes:	Source: Masters Abstracts International, Volume: 55-06.
Contained By:	Masters Abstracts International55-06(E).
Subject:	Climate change. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10159912
ISBN:	9781369148404

Responses of native Hawaiian calcifying macroalgae to naturally occurring ocean acidification conditions.
Hart, Kendra M.

Responses of native Hawaiian calcifying macroalgae to naturally occurring ocean acidification conditions. - Ann Arbor : ProQuest Dissertations & Theses, 2016 - 59 p.

Source: Masters Abstracts International, Volume: 55-06.

Thesis (M.S.)--University of Hawai'i at Hilo, 2016.

Rising atmospheric carbon dioxide (CO2) levels from anthropogenic emissions have elevated oceanic CO2 concentrations through air-sea exchange, which lowers pH and decreases calcium carbonate (CaCO3) saturation, including aragonite saturation (one of the mineral forms of CaCO 3). These conditions, named ocean acidification (OA), impair the ability of calcifying marine algae to form CaCO3 and maintain physiological structures essential for growth, reproduction, and survival. In the Hawaiian Islands, submarine groundwater discharge (SGW) has high partial pressure of CO2 (pCO2), average concentration 3000 ppm. This study used natural variations in pCO2 caused by SGW to examine effects of lowered aragonite saturation on Native Hawaiian calcifying macroalgae: Halimeda macroloba (Chlorophyta), Padina australis (Phaeophyta), Dichotomaria marginata (Rhodophyta), and Galaxaura rugosa (Rhodophyta). Temperature, salinity, pH, total alkalinity, total CO2, pCO 2, and aragonite saturation states were quantified at four sites on Hawai'i Island. Four calcifying algal species were transplanted within and between sites with differing pCO2 and aragonite saturation states. Percent CaCO3 content and photosynthetic activity were assessed before, during, and after transplantation. After ten days, all algal species showed a greater change in percent CaCO3 content at the experimental site, the site representative of OA conditions including high pCO2, low pH, and low aragonite saturation, than the corresponding control sites. Padina australis experienced the greatest percent change in CaCO3, -60% (+/- 63% propagation of error); whereas, G. rugosa experienced the least change, -4% (+/- 5% propagation of error). Photosynthetic activity in H. macroloba and G. rugosa had no significant change during transplant experiments; however, P. australis did have a significant change in photosynthetic activity at the experimental site, and thalli were dead by day ten. Halimeda and Galaxaura may be more resistant to OA than Padina. Different responses among the algal species may be related to differences in their morphology and anatomy. Results suggest that OA has the potential to shift nearshore macroalgal community structure and reduce biodiversity in the Hawaiian Islands.

ISBN: 9781369148404Subjects--Topical Terms:

2079509
Climate change.

Responses of native Hawaiian calcifying macroalgae to naturally occurring ocean acidification conditions.
LDR:03218nmm a2200301 4500 001 2120805
005 20170724102532.5
008 180830s2016 ||||||||||||||||| ||eng d
020 $a 9781369148404
035 $a (MiAaPQ)AAI10159912
035 $a AAI10159912
040 $a MiAaPQ $c MiAaPQ
100 1 $a Hart, Kendra M. $3 3282760
245 1 0 $a Responses of native Hawaiian calcifying macroalgae to naturally occurring ocean acidification conditions.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2016
300 $a 59 p.
500 $a Source: Masters Abstracts International, Volume: 55-06.
500 $a Adviser: Karla J. McDermid.
502 $a Thesis (M.S.)--University of Hawai'i at Hilo, 2016.
520 $a Rising atmospheric carbon dioxide (CO2) levels from anthropogenic emissions have elevated oceanic CO2 concentrations through air-sea exchange, which lowers pH and decreases calcium carbonate (CaCO3) saturation, including aragonite saturation (one of the mineral forms of CaCO 3). These conditions, named ocean acidification (OA), impair the ability of calcifying marine algae to form CaCO3 and maintain physiological structures essential for growth, reproduction, and survival. In the Hawaiian Islands, submarine groundwater discharge (SGW) has high partial pressure of CO2 (pCO2), average concentration 3000 ppm. This study used natural variations in pCO2 caused by SGW to examine effects of lowered aragonite saturation on Native Hawaiian calcifying macroalgae: Halimeda macroloba (Chlorophyta), Padina australis (Phaeophyta), Dichotomaria marginata (Rhodophyta), and Galaxaura rugosa (Rhodophyta). Temperature, salinity, pH, total alkalinity, total CO2, pCO 2, and aragonite saturation states were quantified at four sites on Hawai'i Island. Four calcifying algal species were transplanted within and between sites with differing pCO2 and aragonite saturation states. Percent CaCO3 content and photosynthetic activity were assessed before, during, and after transplantation. After ten days, all algal species showed a greater change in percent CaCO3 content at the experimental site, the site representative of OA conditions including high pCO2, low pH, and low aragonite saturation, than the corresponding control sites. Padina australis experienced the greatest percent change in CaCO3, -60% (+/- 63% propagation of error); whereas, G. rugosa experienced the least change, -4% (+/- 5% propagation of error). Photosynthetic activity in H. macroloba and G. rugosa had no significant change during transplant experiments; however, P. australis did have a significant change in photosynthetic activity at the experimental site, and thalli were dead by day ten. Halimeda and Galaxaura may be more resistant to OA than Padina. Different responses among the algal species may be related to differences in their morphology and anatomy. Results suggest that OA has the potential to shift nearshore macroalgal community structure and reduce biodiversity in the Hawaiian Islands.
590 $a School code: 1418.
650 4 $a Climate change. $2 bicssc $3 2079509
650 4 $a Aquatic sciences. $3 3174300
650 4 $a Biology. $3 522710
690 $a 0404
690 $a 0792
690 $a 0306
710 2 $a University of Hawai'i at Hilo. $b Tropical Conservation Biology & Environmental Science. $3 3182877
773 0 $t Masters Abstracts International $g 55-06(E).
790 $a 1418
791 $a M.S.
792 $a 2016
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10159912