Dimensions of sustainability: The use of vara blanca as a natural resource in the tropical deciduous forest of Sonora, Mexico

Persistent Link:
http://hdl.handle.net/10150/284272
Title:
Dimensions of sustainability: The use of vara blanca as a natural resource in the tropical deciduous forest of Sonora, Mexico
Author:
Lindquist, Cynthia Anne
Issue Date:
2000
Publisher:
The University of Arizona.
Rights:
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
Abstract:
Croton fantzianus Seymour (Euphorbiaceae), is a structurally important tree in the tropical deciduous forest of the Municipality of Alamos in southern Sonora. It has become important as a non-timber forest product within the last thirty-five years, harvested for stakes (vara blanca ) for the agricultural fields in Sonora, Sinaloa and Baja California. A study was carried out on ecology of the species, macroeconomics and household economics to determine sustainability of current patterns of use. During a study on the ecology of the tree the species was identified from specimens collected and found to be a disjunct population known previously from Nicaragua. It was determined that vegetative and reproductive phenologies are driven by water availability with responses along a water gradient varying among study sites. Rapid development of silver mining precipitated woodcutting for timber and fuel at unprecedented rates in the late 17th century. The original tropical deciduous forest was transformed to secondary forest by this extraction. Closure of the mines in the early 20th century began economic isolation of the Municipality that persists today. The economy of Alamos is depressed in response to national and state economy, people are under- or un-employed. Many cut vara blanca. Economic strategies in the Municipality include exploitation of non-timber forest products, the most important is vara blanca. There are three levels of organization for vara extraction: cutters, middlemen truckers, and large truckers. Income generated by each level is significantly larger than the daily minimum wage. Financial records indicate that nine of eleven respondents rely on the resource for all or part of their incomes. A study of the population ecology of the species indicates it is the most important component of the forest community at all study sites. Population structure and composition are variable and may be related to prior harvest history. Loss of reproductive capacity was recorded on a recently harvested area. The tree may be a successional species and does well in disturbed areas. Government records and informant interviews indicate intensification of extraction has depleted the population. It is questionable if extraction at recent rates can be sustained.
Type:
text; Dissertation-Reproduction (electronic)
Keywords:
Biology, Ecology.; Agriculture, Forestry and Wildlife.; Economics, Agricultural.
Degree Name:
Ph.D.
Degree Level:
doctoral
Degree Program:
Graduate College; Arid Lands Resource Sciences
Degree Grantor:
University of Arizona
Advisor:
Hutchinson, Charles F.

Full metadata record

DC FieldValue Language
dc.language.isoen_USen_US
dc.titleDimensions of sustainability: The use of vara blanca as a natural resource in the tropical deciduous forest of Sonora, Mexicoen_US
dc.creatorLindquist, Cynthia Anneen_US
dc.contributor.authorLindquist, Cynthia Anneen_US
dc.date.issued2000en_US
dc.publisherThe University of Arizona.en_US
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en_US
dc.description.abstractCroton fantzianus Seymour (Euphorbiaceae), is a structurally important tree in the tropical deciduous forest of the Municipality of Alamos in southern Sonora. It has become important as a non-timber forest product within the last thirty-five years, harvested for stakes (vara blanca ) for the agricultural fields in Sonora, Sinaloa and Baja California. A study was carried out on ecology of the species, macroeconomics and household economics to determine sustainability of current patterns of use. During a study on the ecology of the tree the species was identified from specimens collected and found to be a disjunct population known previously from Nicaragua. It was determined that vegetative and reproductive phenologies are driven by water availability with responses along a water gradient varying among study sites. Rapid development of silver mining precipitated woodcutting for timber and fuel at unprecedented rates in the late 17th century. The original tropical deciduous forest was transformed to secondary forest by this extraction. Closure of the mines in the early 20th century began economic isolation of the Municipality that persists today. The economy of Alamos is depressed in response to national and state economy, people are under- or un-employed. Many cut vara blanca. Economic strategies in the Municipality include exploitation of non-timber forest products, the most important is vara blanca. There are three levels of organization for vara extraction: cutters, middlemen truckers, and large truckers. Income generated by each level is significantly larger than the daily minimum wage. Financial records indicate that nine of eleven respondents rely on the resource for all or part of their incomes. A study of the population ecology of the species indicates it is the most important component of the forest community at all study sites. Population structure and composition are variable and may be related to prior harvest history. Loss of reproductive capacity was recorded on a recently harvested area. The tree may be a successional species and does well in disturbed areas. Government records and informant interviews indicate intensification of extraction has depleted the population. It is questionable if extraction at recent rates can be sustained.en_US
dc.typetexten_US
dc.typeDissertation-Reproduction (electronic)en_US
dc.subjectBiology, Ecology.en_US
dc.subjectAgriculture, Forestry and Wildlife.en_US
dc.subjectEconomics, Agricultural.en_US
thesis.degree.namePh.D.en_US
thesis.degree.leveldoctoralen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.disciplineArid Lands Resource Sciencesen_US
thesis.degree.grantorUniversity of Arizonaen_US
dc.contributor.advisorHutchinson, Charles F.en_US
dc.identifier.proquest9992094en_US
dc.identifier.bibrecord.b41169694en_US
All Items in UA Campus Repository are protected by copyright, with all rights reserved, unless otherwise indicated.