자료유형  

 학위논문

Control Number  

0016932611

International Standard Book Number  

9798379826178

Dewey Decimal Classification Number  

597.8

Main Entry-Personal Name  

Zumbado-Ulate, Hector.

Publication, Distribution, etc. (Imprint  

[S.l.] : Purdue University., 2021

Publication, Distribution, etc. (Imprint  

Ann Arbor : ProQuest Dissertations & Theses, 2021

Physical Description  

1 online resource(184 p.)

General Note  

Source: Dissertations Abstracts International, Volume: 85-01, Section: B.

General Note  

Advisor: Searle, Catherine L.

Dissertation Note  

Thesis (Ph.D.)--Purdue University, 2021.

Restrictions on Access Note  

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

Summary, Etc.  

요약The incidence and frequency of emerging infectious diseases (EIDs) of wildlife have increased in the last 50 years. The spread of EIDs is a major concern because it can cause vulnerable species and even entire taxa to experience population decline and extinction. For example, numerous amphibian species drastically declined or went extinct in Mesoamerica between the 1980s and early 2000s, likely due to the introduction and spread of the pathogenic fungus Batrachochytrium dendrobatidis (hereafter 'Bd'). While most of the initial declines were documented at high elevations, further studies conducted throughout the region after 2005 revealed that some species also declined in lowland undisturbed ecosystems and that prevalence and intensity of Bd infection vary with host species, geographic location, seasonality, and microhabitat conditions. In Chapter 1, I examined the dynamics of Bd in lowland amphibian communities in the tropic forests of Costa Rica. I found that Bd is widespread and exhibits enzootic dynamics (i.e., well adapted to local climate, exhibits low prevalence, and low to undetectable mortality rates). In Chapter 2, I described the current Bd enzootic dynamics across elevations and ecoregions in Costa Rica. I found that Bd exhibits seasonal dynamics, especially in lowlands. I also identified directdeveloping, stream-dwelling amphibians as one of the groups most affected by the introduction and spread of Bd. In Chapter 3, I quantified the spread of Bd from pre-2005, when populations experienced epizootics (i.e., times of high infection prevalence and high disease-associated mortality) to post-2005, when populations experienced enzootics in Costa Rica. I found that 80% of the area of undisturbed ecosystems overlaps with the predicted distribution of enzootic Bd and identified several hotspots for disease. Finally, in Chapter 4, I conducted a threat assessment in different spatial scales for 46 direct-developing, stream-dwelling frog species endemic to Mesoamerica. At both regional and local levels, I found evidence that Bdwas the main driver of the decline of most species. Together, my results add to the understanding of host-pathogen dynamics in the Tropics and address actions for regions and species that need immediate conservation management.

Subject Added Entry-Topical Term  

Frogs.

Subject Added Entry-Topical Term  

Forests.

Subject Added Entry-Topical Term  

Volcanoes.

Subject Added Entry-Topical Term  

Habitats.

Subject Added Entry-Topical Term  

Endangered & extinct species.

Subject Added Entry-Topical Term  

Wildlife conservation.

Subject Added Entry-Topical Term  

Deforestation.

Subject Added Entry-Topical Term  

Ecology.

Subject Added Entry-Topical Term  

Forestry.

Subject Added Entry-Topical Term  

Geology.

Added Entry-Corporate Name  

Purdue University.

Host Item Entry  

Dissertations Abstracts International. 85-01B.

Host Item Entry  

Dissertation Abstract International

Electronic Location and Access  

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Control Number  

joongbu:642936