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Universidad Nacional de Salta (2000)

Commercial use sustainability assessment of three species of the Semiarid Chaco : ecologic, economic, social and institutional dimensions

Barbaran, Francisco R

Titre : Commercial use sustainability assessment of three species of the Semiarid Chaco : ecologic, economic, social and institutional dimensions

Auteur : Barbaran, Francisco R

Université de soutenance : Universidad Nacional de Salta

Grade : Doctor of Philosophy (PhD) 2000

Résumé
I analyzed commercial use sustainability of three species of the Semiarid Chaco with different habitat requirements : tegu lizard Tupinambis sp. ; peccary Tayassu sp. and ostrich Rhea americana. Study area : Rivadavia Department (26000 sq. Km.) placed East of Salta Province, Argentina, between the boundaries with Bolivia and Paraguay. Studding the history of ecosystem use between 1640 and 2000, I identified the main indicators of use in different sustainability dimensions. Ecologic dimension : I studied habitat condition comparing two evaluations of range condition made in 1920 and 1987, NDVI of three Landsat images (1976, 1984 and 1987) and cattle censuses. Searching in files of provincial wildlife agency, I built forestry statistics with extraction permits, analyzed traffic permits of skins and feathers of species involved and interviewed 106 trappers in 36 trapping points to know the capture trend along time. Economic dimension : I analyzed national and export markets, the trade chain and income distribution between its different links, CITES permits and business strategies considering legal and illegal trade. Social Dimensions : I studied concept of economy in trapping collecting cultures (indians and mestizos), emigration balances between censuses, poverty, birth and mortality rates and analyzed fail causes of 340 development projects directed to indians in study area between 1969 and 1992. Institutional Dimension : I studied all the provincial and national legislation related to forestry, wildlife, range, soil and cattle raise promotion between 1853 and 2000. Comparing mission, function, budget use and legislation with reality on the field, I assessed the performance of provincial wildlife agency between its beginning in 1945 and 2000. Conclusions : Only tegu lizard trade is close to sustainability considering high resilience of its population, adapted to live in any habitat condition under high trapping pressure. On the other hand, prices were fair for trappers. Despite that, the poor performance of wildlife agency should be taken in account considering all the species studied. The main contribution of this dissertation is the creation of a new method to assess sustainability. I called it the Command Board of Sustainability because I could be able to find the interconnections between the main sustainability indicators in the different dimensions, making possible to predict if the ecosystem is going or not to sustainability according to changes in indicators values. Despite it can be applied in any ecosystem, the main constraint of this method is the deep understanding of ecosystem dynamic and access to key information related to indicators that may not be available, specially in developing countries.

Présentation (DISCCRS)

Page publiée le 13 janvier 2015, mise à jour le 3 juillet 2017