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The Multifaceted Aspects of Ecosystem Integrity Ecology and Society
De Leo, Giulio A; Agenzia Regionale per la Protezione dell' Ambiente; deleo@dsa.unipr.it; Levin, Simon A; Princeton University; slevin@eno.princeton.edu.
The need to reduce human impacts on ecosystems creates pressure for adequate response, but the rush to solutions fosters the oversimplification of such notions as sustainable development and ecosystem health. Hence, it favors the tendency to ignore the complexity of natural systems. In this paper, after a brief analysis of the use and abuse of the notion of ecosystem health, we address the problem of a sound definition of ecosystem integrity, critically review the different methodological and conceptual approaches to the management of natural resources, and sketch the practical implications stemming from their implementation. We show thatthere are merits and limitations in different definitions of ecosystem integrity, for each acknowledges different...
Tipo: Peer-Reviewed Reports Palavras-chave: Adaptive management; Biodiversity; Complexity and stability; Conservation strategies; Disturbance anthropogenic; Disturbance natural; Ecosystem integrity; Ecosystem functioning; Ecosytem structure; Natural resource management; Resilience; Sustainable development..
Ano: 1997
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Genetic diversity and structure of native maize races from Northwestern Mexico PAB
Vega-Alvarez,Isrrael; Santacruz-Varela,Amalio; Rocandio-Rodríguez,Mario; Córdova-Téllez,Leobigildo; López-Sánchez,Higinio; Muñoz-Orozco,Abel; Hernández-Bautista,Aurelio.
Abstract: The objective of this work was to evaluate the genetic diversity of nine maize races (Zea mays ssp. mays) from Northwestern Mexico and one population of teosinte of the Balsas race (Zea mays ssp. parviglumis). A total of 649 alleles were identified, with an average of 20.9 alleles per locus using 31 microsatellite loci; 84.3% of them were polymorphic loci with a 0.49 expected heterozygosity. Graphic representation of principal coordinate analysis (PCoA) showed broad variation and population distribution. The highest probabilistic value obtained with the ΔK criterion confirmed the existence of five population groups clustered by the Bayesian model. This grouping coincided with the population distribution observed in the PCoA graph. Maize races...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Zea mays; Conservation strategies; Landraces; Microsatellites; Plant breeding.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2017001101023
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Small-sized fish: the largest and most threatened portion of the megadiverse neotropical freshwater fish fauna Biota Neotropica
Castro,Ricardo M. C.; Polaz,Carla N. M..
Abstract: We introduce the work providing a synthetic description of the diversity and phyletic structure of freshwater fish in the Neotropical Region, especially emphasizing that of Brazil. This is accompanied by a discussion about environments of fish from small to medium sized to large, taking into account how it shaped their respective biologies/ecologies, as well as what they imply for their use by humans. We present, as figures, the results of our exploratory analysis of Brazilian Red Book of Threatened Species of Fauna (2018), focusing on the small-sized ones, with up to 15 cm of standard length. We continue to present the main human impacts in small fish environments, along with those suffered by medium to large fish environments, and then follow...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Small fishes; Brazilian ichthyofauna; Endangered fishes; Conservation strategies; Biodiversity policies.
Ano: 2020 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032020000100601
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