東華大學圖書館 |

Language: English

Help

回圖書館首頁

手機版館藏查詢

Back to Search results for [ null ]

Switch To: Labeled | MARC Mode | ISBD

The diversity and endangerment of Ha...

Pau, Stephanie.

Linked to FindBook

Google Book

Amazon

博客來

The diversity and endangerment of Hawaiian dry forests and their role as a signal for climate change.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	The diversity and endangerment of Hawaiian dry forests and their role as a signal for climate change./
Author:	Pau, Stephanie.
Description:	141 p.
Notes:	Source: Dissertation Abstracts International, Volume: 71-04, Section: B, page: 2268.
Contained By:	Dissertation Abstracts International71-04B.
Subject:	Physical Geography. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3401658
ISBN:	9781109687408

The diversity and endangerment of Hawaiian dry forests and their role as a signal for climate change.
Pau, Stephanie.

The diversity and endangerment of Hawaiian dry forests and their role as a signal for climate change. - 141 p.

Source: Dissertation Abstracts International, Volume: 71-04, Section: B, page: 2268.

Thesis (Ph.D.)--University of California, Los Angeles, 2009.

Tropical dry forests are among the most endangered ecosystems worldwide and the Hawaiian Islands are located within a biodiversity hotspot. This dissertation examines the roles of biological, climatic, and anthropogenic factors in determining the levels of endangerment, patterns of species richness, structure, and composition in Hawaiian dry forest trees. Chapter 1 examines the current endangerment of dry forest trees. Forty-five percent of Hawaiian dry forest trees are at risk of endangerment. Dry forest trees at risk have a significantly larger range size compared to trees at risk in other Hawaiian forest types. Among dry forest trees, those with hermaphroditic breeding systems, autochorous dispersal mechanisms, conspicuous flowers, and dry fruit were all more likely to be at risk of endangerment. In Chapter 2 field measurements, GIS, and remote sensing are used to examine patterns of diversity in remaining dry forest fragments. Big Island contains the largest area of remaining native dry forests (1.4% of island area) and is among the highest in species richness. Anthropogenic factors such as fragmentation, or biological interactions related to resource competition, appear to be the dominant determinants of species richness as opposed to climate-controlled processes. In Chapter 3 remote sensing is used to examine the leaf phenology of Hawaiian forests over the past 9 years. Dry forest NDVI (Normalized Difference Vegetation Index) is more tightly coupled with precipitation seasonality compared to rainforest NDVI. While dry forests experienced reduced photosynthesis during the 2002-2003 El Nino drought, rainforest photosynthesis increased. In Chapter 4 a paleo-ecological analysis of the sediments from Kealia Pond, Maui is used to examine climate change and human impact on lowland forests over the past 2,600 years. Native forests appear to have been relatively resilient to fire throughout much of the Polynesian period. The greatest reduction in overall diversity occurred during the European period, and primary accounts by Europeans during the 18th and 19th centuries provide a historical narrative that supports this interpretation. Furthermore, there is strong evidence of increased precipitation during the Medieval Climate Anomaly (977-1212 AD) and this hydrological shift may have supported rapid human population growth and expansion into dry marginal environments.

ISBN: 9781109687408Subjects--Topical Terms:

893400
Physical Geography.

The diversity and endangerment of Hawaiian dry forests and their role as a signal for climate change.
LDR:03464nam 2200313 4500 001 1398767
005 20110915090220.5
008 130515s2009 ||||||||||||||||| ||eng d
020 $a 9781109687408
035 $a (UMI)AAI3401658
035 $a AAI3401658
040 $a UMI $c UMI
100 1 $a Pau, Stephanie. $3 1677666
245 1 4 $a The diversity and endangerment of Hawaiian dry forests and their role as a signal for climate change.
300 $a 141 p.
500 $a Source: Dissertation Abstracts International, Volume: 71-04, Section: B, page: 2268.
500 $a Advisers: Thomas Welch Gillespie; Glen Michael MacDonald.
502 $a Thesis (Ph.D.)--University of California, Los Angeles, 2009.
520 $a Tropical dry forests are among the most endangered ecosystems worldwide and the Hawaiian Islands are located within a biodiversity hotspot. This dissertation examines the roles of biological, climatic, and anthropogenic factors in determining the levels of endangerment, patterns of species richness, structure, and composition in Hawaiian dry forest trees. Chapter 1 examines the current endangerment of dry forest trees. Forty-five percent of Hawaiian dry forest trees are at risk of endangerment. Dry forest trees at risk have a significantly larger range size compared to trees at risk in other Hawaiian forest types. Among dry forest trees, those with hermaphroditic breeding systems, autochorous dispersal mechanisms, conspicuous flowers, and dry fruit were all more likely to be at risk of endangerment. In Chapter 2 field measurements, GIS, and remote sensing are used to examine patterns of diversity in remaining dry forest fragments. Big Island contains the largest area of remaining native dry forests (1.4% of island area) and is among the highest in species richness. Anthropogenic factors such as fragmentation, or biological interactions related to resource competition, appear to be the dominant determinants of species richness as opposed to climate-controlled processes. In Chapter 3 remote sensing is used to examine the leaf phenology of Hawaiian forests over the past 9 years. Dry forest NDVI (Normalized Difference Vegetation Index) is more tightly coupled with precipitation seasonality compared to rainforest NDVI. While dry forests experienced reduced photosynthesis during the 2002-2003 El Nino drought, rainforest photosynthesis increased. In Chapter 4 a paleo-ecological analysis of the sediments from Kealia Pond, Maui is used to examine climate change and human impact on lowland forests over the past 2,600 years. Native forests appear to have been relatively resilient to fire throughout much of the Polynesian period. The greatest reduction in overall diversity occurred during the European period, and primary accounts by Europeans during the 18th and 19th centuries provide a historical narrative that supports this interpretation. Furthermore, there is strong evidence of increased precipitation during the Medieval Climate Anomaly (977-1212 AD) and this hydrological shift may have supported rapid human population growth and expansion into dry marginal environments.
590 $a School code: 0031.
650 4 $a Physical Geography. $3 893400
650 4 $a Climate Change. $3 894284
650 4 $a Paleoclimate Science. $3 1674687
650 4 $a Environmental Sciences. $3 676987
690 $a 0368
690 $a 0404
690 $a 0653
690 $a 0768
710 2 $a University of California, Los Angeles. $3 626622
773 0 $t Dissertation Abstracts International $g 71-04B.
790 1 0 $a Gillespie, Thomas Welch, $e advisor
790 1 0 $a MacDonald, Glen Michael, $e advisor
790 $a 0031
791 $a Ph.D.
792 $a 2009
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3401658