• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 1084
  • 242
  • 39
  • 24
  • 17
  • 16
  • 14
  • 13
  • 10
  • 10
  • 10
  • 10
  • 10
  • 10
  • 7
  • Tagged with
  • 1599
  • 782
  • 148
  • 143
  • 120
  • 113
  • 106
  • 104
  • 98
  • 96
  • 96
  • 96
  • 87
  • 86
  • 82
  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Delineating pattern and process in tropical lowland : mealy parrot migration dynamics as a guide for regional conservation planning /

Bjork, Robin D. January 1900 (has links)
Thesis (Ph. D.)--Oregon State University, 2005. / Printout. Includes bibliographical references. Also available on the World Wide Web.
2

Ecology of the bird community of regenerating forest habitats in lowland equatorial Colombia

Tye, Hilary January 1995 (has links)
No description available.
3

Modeling the ¿Amazon¿ phenomenon: colonization events and gender performances

Taylor, Timothy F. January 2010 (has links)
No
4

Pre-Columbian land use and human impact in the Bolivian Amazon

Carson, John Francis January 2014 (has links)
There is a polarised debate amongst Neotropical archaeologists and ecologists over the extent of Pre-Columbian (pre-AD 1492) anthropogenic environmental impacts in Amazonia. While some maintain the old paradigm of pre-Columbian Amazonia as a “pristine wilderness”, which was sparsely populated by humans, others point to the discovery of an increasing number of archaeological sites across the Amazon basin as evidence for large, complex societies, supported by intensive agriculture and management of forest and aquatic resources. Under this model, pre- Columbian people had profound impacts on biogeochemical cycles through largescale deforestation and biomass burning, and left an indelible legacy on Amazonian ecosystems by altering edaphics, geomorphology, hydrology, and the distribution of plant taxa. However, so far this debate has continued amongst a paucity of palaeoecological data, meaning that we have little evidence to indicate the scale of impact, and often no palaeoenvironmental context in which to place these societies. Other aspects of pre-Columbian cultures, such as their chronology, land use practices and subsistence strategies, are also poorly understood. In this thesis, palaeoecological methods are applied to improve our understanding of the scale, nature, and legacy of land use associated with pre- Columbian geometric earthwork cultures in north-east Bolivia. The methodology employs analysis of fossil pollen and macroscopic charcoal from lake core sediments. In total 110 pollen and 628 charcoal samples were analysed from four lakes: Laguna Isireri (14°49’18”S, 65°40’57”W), Laguna Orícore (13°20’44”S, 63°31’31”W), Laguna Granja (13°15’44”S, 63°42’37”W) and Laguna La Luna (13°21’20”S, 63°35’2”W). Chronologies were built for these cores from 12 AMS 14C dates. Results are presented in four chapters (thesis chapters 2-5), in the form of academic papers. Chapter 2 describes a new laboratory technique co-developed with Whitney et al., which improves the recovery of cultigen pollen grains from sediments from large, Neotropical lake basins. This technique was applied in the laboratory preparations of sediments analysed for Chapters 3-5. Chapter 3 employs palaeoecological reconstructions from differently sized lakes (L. Granja and L. Orícore) in the same earthwork region, to obtain both a regional- and a local-scale history of environmental change/human impact around the archaeological site. Key findings of this paper are: 1) earthworks were built in an originally open savannah landscape, which existed under drier-than-present climatic conditions in the mid-to-late-Holocene; 2) forest expanded into this region from ~ 2000 (cal yrs) BP and was supressed locally around the settlement to maintain an open landscape; therefore, 3) earthwork construction across southern Amazonia, may not have required extensive deforestation, and pre-Columbian impacts on biogeochemical cycling may have been much less than some authors have suggested. Chapter 4 looks more closely at the local scale record provided by L. Granja. These data are integrated with phytolith data analysed by co-author J. Watling and existing archaeological data, to discuss the chronology of settlement on the site, the agricultural/land use strategies employed by its inhabitants, and the spatial scale and distribution of impacts locally around the site. Key findings are that: 1) first occupation of the site is much earlier than previously dated from archaeological contexts, beginning ~2500 BP; 2) maize was the staple crop grown on site; 3) land use involved more extensive and intensive burning of the landscape than compared to modern slash-and-burn agriculture; 4) site decline occurred ~ 500 BP, and may have been related to the Columbian Encounter of AD1492; 5) the close integration of local scale palaeoecological records with archaeology, is highly useful in discerning aspects of chronology and spatial variability of land use. Chapter 5 presents a 6000 year record of palaeoenvironmental change and land use on a pre-Columbian forest island site. Key findings are that: 1) As in Chapter 3, inhabitants exploited an originally open landscape and practiced forest suppression to maintain that open landscape; 2) the earliest recorded evidence for maize agriculture in the region is found at 2100 BP; 3) the economically useful species Theobroma cacao, which is abundant on the site today, is not detectable in the pollen record; 4) clear-cutting was not practiced on the site and previous population estimates, based on labour for deforestation, must be reconsidered. The work in this thesis reveals a new model of human-environment interactions, demonstrating that pre-Columbian earthwork cultures in southern Amazonia occupied and adapted to a region of dynamic, climatically controlled forest-savannah transition during the mid-to-late-Holocene. Obtaining a palaeoenvironmental context for archaeological landscapes, is shown to be a vital pre-requisite to inferring past environmental impacts. Furthermore, we demonstrate the valuable contribution that palaeoecology can make to a better understanding of the chronology and land use practices of pre-Columbian cultures.
5

Cold counsels and hot tempers : the development of the Germanic Amazon in Old Norse literature

Bergen, Kristina 21 December 2006
Cold Counsels and Hot Tempers: The Development of the Germanic Amazon in Old Norse Literature will trace how the evolution of the powerful woman in literature shaped the development of female characters in the classical Icelandic family sagas and the Fornaldarsögur, or later sagas of ancient times. The thesis will focus on the conception and representation of the proverb köld eru kvenna ráð cold are the counsels of women specifically tracing the function of women in feud structures and folk motifs that involve assault and acts of revenge. In the early Germanic sources, women are direct participants in violence; they train themselves in warfare, take up weapons, begin feuds, avoid unwanted marriages and hold kingdoms through force of arms. In later Norse literature, women rely on verbal persuasion to force men into action; they use goading, seduction, and insult to engage men in violence. Cold Counsels and Hot Tempers will examine these changes in womens roles and investigate the different methods women use to access power.
6

Cold counsels and hot tempers : the development of the Germanic Amazon in Old Norse literature

Bergen, Kristina 21 December 2006 (has links)
Cold Counsels and Hot Tempers: The Development of the Germanic Amazon in Old Norse Literature will trace how the evolution of the powerful woman in literature shaped the development of female characters in the classical Icelandic family sagas and the Fornaldarsögur, or later sagas of ancient times. The thesis will focus on the conception and representation of the proverb köld eru kvenna ráð cold are the counsels of women specifically tracing the function of women in feud structures and folk motifs that involve assault and acts of revenge. In the early Germanic sources, women are direct participants in violence; they train themselves in warfare, take up weapons, begin feuds, avoid unwanted marriages and hold kingdoms through force of arms. In later Norse literature, women rely on verbal persuasion to force men into action; they use goading, seduction, and insult to engage men in violence. Cold Counsels and Hot Tempers will examine these changes in womens roles and investigate the different methods women use to access power.
7

A rich realm of nature destroyed the middle Amazon valley, 1640-1750 /

Sweet, David Graham, January 1900 (has links)
Thesis--University of Wisconsin. / Vita. Photocopy of typescript. Ann Arbor, Mich. : University Microfilms International, 1977. -- 22 cm. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 821-835).
8

A rich realm of nature destroyed the middle Amazon valley, 1640-1750 /

Sweet, David Graham, January 1900 (has links)
Thesis--University of Wisconsin. / Vita. Photocopy of typescript. Ann Arbor, Mich. : University Microfilms International, 1977. -- 22 cm. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 821-835).
9

A rich realm of nature destroyed the middle Amazon valley, 1640-1750 /

Sweet, David G. January 1900 (has links)
Thesis (Ph. D.)--University of Wisconsin--Madison, 1974. / Typescript. Vita. Description based on print version record. Includes bibliographical references (leaves 821-835).
10

The extent of reductions to protected areas in the Brazilian Amazon: case study of Amazon National Park

Laue, Justin Edward 23 September 2014 (has links)
Over the past several decades, the preservation of Brazil's natural landscapes and traditional cultures has received significant global attention; the focus of which has been primarily on the Amazon Basin. In order to safeguard the Amazon's unique biodiversity, natural resources, and traditional cultures, Brazil's state and federal governments have designated hundreds of thousands of square kilometers as conservation units with legally protected statuses. To effectively accomplish conservation objectives, it is necessary to maintain the permanence of protected areas. However, over the past decade, a host of circumstances has plagued Brazil's protected areas. Due to land use and economic pressures, the sizes of many protected areas throughout the Amazon are being reduced. Understanding the drivers and outcomes of reductions to protected areas is essential for the long-term preservation of ecosystem services. To that end, the objectives of this thesis were to understand why and how quickly a national park in the Legal Brazilian Amazon was being reduced in size by the Brazilian government. Interviews with key informants demonstrated that the park historically lacked legitimacy amongst newly arrived migrants which influenced the colonization amongst its borders. Moreover, inept governance regimes facilitated settlements within the park. Satellite imagery was used to detect and quantify the substantial rise in deforestation within the park. Spontaneous settlement in the region and a governance structure that did not enforce the park’s legality played a significant influence on the downsizing of Amazon National Park. In addition, domestic energy demands prompted the federal government to embark on a national energy strategy centered on hydropower construction that has directly impacted the park’s conservation effectiveness of maintaining natural forest cover. Together, these two drivers have united to considerably reduce both the size and the effectiveness of Amazon National Park. / text

Page generated in 0.072 seconds