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| Registros recuperados: 76 | |
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| RIBAS,CAMILA C.; ALEIXO,ALEXANDRE. |
| Abstract: Amazonia has been a focus of interest since the early days of biogeography as an intrinsically complex and extremely diverse region. This region comprises an intricate mosaic that includes diverse types of forest formations, flooded environments and open vegetation. Increased knowledge about the distribution of species in Amazonia has led to the recognition of complex biogeographic patterns. The confrontation of these biogeographic patterns with information on the geological and climatic history of the region has generated several hypotheses dedicated to explain the origin of the biological diversity. Genomic information, coupled with knowledge of Earth’s history, especially the evolution of the Amazonian landscape, presents fascinating... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Amazonia; Biogeography; Birds; Conservation; Diversification; Rivers. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000600611 |
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| Pelaez,Victor; Mizukawa,Gabriel. |
| ABSTRACT: The pesticide industry has undergone a diversification process led by six leading companies (Monsanto, Syngenta, Bayer, Dow, DuPont, BASF) that control roughly 68% of the world market. This growth, initiated in the second half of the 1990s, occurred through deals and acquisitions of companies from the seed and biopesticide markets. This paper analyzes these diversification strategies, which have involved a capital mobilization process based on the exploitation of economies of scope and management of complementary assets. This aims to minimize the risks of investment in consolidated markets as well as in new ones. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Pesticides; Seeds; Biopesticides; Diversification; Growth. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782017000200152 |
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| León Herrera, Albert. |
| El objetivo de esta investigación fue comparar el método propuesto por Harry Markowitz (media y varianza) y el método propuesto por Javier Estrada (media-semivarianza), en la elección de un portafolio de inversión, conformado por una mezcla diversificada de cultivos agrícolas. Los datos trabajados fueron rentabilidades de cinco productos agrícolas, mismos que fueron deflactados y de ellos se obtuvieron las ganancias del periodo 1979-2009. Ganancias que nos permitieron calcular la matriz de covarianzas de los productos agrícolas por ambos métodos. Posteriormente se realizo una simulación de 100 repeticiones de tamaño n=30, para obtener las rendimientos de cada producto mediante ambos métodos de solución, para presentar un histograma de frecuencias de cada... |
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Palavras-chave: Portafolio de inversión; Diversificación; Rentabilidad; Ganancia; Portfolio investment; Diversification; Profitability; Profit; Desarrollo rural; Maestría. |
| Ano: 2012 |
URL: http://hdl.handle.net/10521/664 |
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| The concept of resilience is widely promoted as a promising notion to guide new approaches to ecosystem and resource management that try to enhance a system's capacity to cope with change. A variety of mechanisms of resilience specific for different systems have been proposed. In the context of resource management those include but are not limited to the diversity of response options and flexibility of the social system to adaptively respond to changes on an adequate scale. However, implementation of resilience-based management in specific real-world systems has often proven difficult because of a limited understanding of suitable interventions and their impact on the resilience of the coupled social-ecological system. We propose an agent-based modeling... |
| Tipo: Peer-Reviewed Reports |
Palavras-chave: Adaptive management; Agent-based model; Amudarya; Diversification; Fisheries; Irrigation; Mechanism; Resilience; River basin; Social-ecological system; Water use.. |
| Ano: 2007 |
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| Blythe, Jessica L.; University of Victoria; jessica.blythe@jcu.edu.au; Murray, Grant; Vancouver Island University; grant.murray@viu.ca; Flaherty, Mark; University of Victoria; flaherty@office.geog.uvic.ca. |
| Change is a defining characteristic of coastal social-ecological systems, yet the magnitude and speed of contemporary change is challenging the adaptive capacity of even the most robust coastal communities. In the context of multiple drivers of change, it has become increasingly important to identify how threatened communities adapt to livelihood stressors. We investigate how adaptation is negotiated in two coastal fishing communities by documenting livelihood stressors, household assets, adaptive strategies, and factors that facilitate or inhibit adaptation. Declining catch is the most common stressor being experienced in both communities, however, socioeconomic, e.g., disease or theft, and ecological, e.g., severe storms and drought, changes are also... |
| Tipo: Peer-Reviewed Reports |
Palavras-chave: Adaptation; Africa; Diversification; Intensification; Livelihoods; Small-scale fisheries. |
| Ano: 2014 |
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| Fontaine, Pascal; Legendre, Marc; Vandeputte, Marc; Fostier, Alexis. |
| How may fish domestication participate in sustainable development of aquaculture? The development of fish farming currently compensates for the stagnation of fishery catches while the market demand continues to increase. The development of fish farming relies on an active diversification of farmed fish species. A diversification based on the farming of native species could reduce the environmental impact of fish culture and could better fit to needs of local markets. Such development could also favour a more integrated local economy. In this context, the building of a generic approach for multi-species domestication is required to optimise the use of the technical and financial means available for fish culture diversification. |
| Tipo: Text |
Palavras-chave: Sustainable development; Fish culture; Domestication; Diversification. |
| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/2009/publication-6557.pdf |
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| Méro, David. |
| Finfish farming diversification is a reality nowadays in France: this work brings the interest of the whole commodity chain for new fish species. This report identifies the species criterions of choice from inquiries beside professionals of the commodity chain, proposes a selection method and tackles, in example, the choice of new species for fish farming in cages on the west coasts of France, from Bay of Biscay to the North Sea. ' Method is divided in two stages: firstly an elimkation stage, which aims are to select from the 25 000 fish species, potential species by using redhibitory postulates, secondly a position stage which classifies the remaining species. A list of 53 species is proposed. Selection has been stopped because of the shortage of data.... |
| Tipo: Text |
Palavras-chave: Aquaculture; Pisciculture; Diversification; Nouvelles espèces; Poissons marins; Aide à la décision; Sélection multicritère; Marché; Transformation. |
| Ano: 1999 |
URL: https://archimer.ifremer.fr/doc/00622/73448/72687.pdf |
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| Donati, Giulia Francesca Azzurra; Parravicini, Valeriano; Leprieur, Fabien; Hagen, Oskar; Gaboriau, Theo; Heine, Christian; Kulbicki, Michel; Rolland, Jonathan; Salamin, Nicolas; Albouy, Camille; Pellissier, Loïc. |
| Habitat dynamics interacting with species dispersal abilities could generate gradients in species diversity and prevalence of species traits when the latter are associated with species dispersal potential. Using a process‐based model of diversification constrained by a dispersal parameter, we simulated the interplay between reef habitat dynamics during the past 140 million years and dispersal, shaping lineage diversification history and assemblage composition globally. The emerging patterns from the simulations were compared to current prevalence of species traits related to dispersal for 6315 tropical reef fish species. We found a significant spatial congruence between the prevalence of simulated low dispersal values and areas with a large proportion of... |
| Tipo: Text |
Palavras-chave: Biodiversity; Dispersal; Diversification; Mechanistic models; Reef fish; Traits. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00516/62750/67136.pdf |
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| Thebaud, Olivier; Innes, James; Norman-lopez, Ana; Slade, Stephanie; Cameron, Darren; Cannard, Toni; Tickell, Sharon; Kung, John; Kerrigan, Brigid; Williams, Lew; Little, L. Richard. |
| An economic survey of the commercial operators currently active in the Queensland Coral Reef Fin-Fish Fishery has been carried out, as part of a research project aimed at evaluating alternative management options for this fishery. This paper presents the background analysis used as a basis to develop the sampling design for this survey. The background analysis focuses on activity patterns of the fleet based on effort and catch information, as well as patterns of quota ownership. Based on this information, a fishing business profile describing the micro-economic structure of fishing operations is developed. This profile, in conjunction with the qualitative information gained in undertaking the economic surveys, allows preliminary understanding of the key... |
| Tipo: Text |
Palavras-chave: Commercial fishing; Queensland Coral Reef Fin-Fish Fishery; Great Barrier Reef; Business structures; ITQs; Diversification. |
| Ano: 2014 |
URL: https://archimer.ifremer.fr/doc/00250/36166/34749.pdf |
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| Quemener, Loic; Suquet, Marc; Mero, David; Gaignon, Jean-louis. |
| At present, European marine fish farming is based on sea bream and sea bass. A trend for diversification is sustained by the diversity of environmental conditions, by the availability of new production techniques such as recirculating systems, by an increase in rearing yields, by new market trends and by the possibilities to reduce risks of disease outbreak. Already reared fish species were chosen considering a limited number of criteria such as a high selling price and the availability of juveniles or breeders in the wild. This paper proposes a new selection method of fish species as candidates for aquaculture development on the French Atlantic, the Channel and the North Sea coasts. Using a three-phase procedure, candidates were selected among 20 000 fish... |
| Tipo: Text |
Palavras-chave: Gadiforms; Cod; Diversification; Species selection; New species. |
| Ano: 2002 |
URL: http://archimer.ifremer.fr/doc/2002/publication-567.pdf |
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| Chalmandrier, Loic; Albouy, Camille; Descombes, Patrice; Sandel, Brody; Faurby, Soren; Syenning, Jens-christian; Zimmermann, Niklaus E.; Pellissier, Loic. |
| Reconstructing the processes that have shaped the emergence of biodiversity gradients is critical to understand the dynamics of diversification of life on Earth. Islands have traditionally been used as model systems to unravel the processes shaping biological diversity. MacArthur and Wilson's island biogeographic model predicts diversity to be based on dynamic interactions between colonization and extinction rates, while treating islands themselves as geologically static entities. The current spatial configuration of islands should influence meta-population dynamics, but long-term geological changes within archipelagos are also expected to have shaped island biodiversity, in part by driving diversification. Here, we compare two mechanistic models providing... |
| Tipo: Text |
Palavras-chave: Allopatric speciation; Continental drift; Dispersal; Diversification; Meta-population model; Neutral model. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00602/71377/69825.pdf |
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| Ramírez,Claudio C.; Salazar,Marcela; Palma,R. Eduardo; Cordero,Cecilia; Meza-Basso,Luís. |
| Neotropical Rhagoletis species are arranged in four groups: nova,psalida,striatella and ferruginea, which include 18 species. On both sides of the Andes, the evolution of morphological differences among these groups has been suggested to be related to the Andes uplift process. In order to test this hypothesis, a phylogenetic analysis of morphological and molecular data was performed. The results suggest that: 1) Neotropical species of Rhagoletis constitute a separate group from Paleartic and North American species, with the only exception being a member of the striatella group having a certain association with the northern species. 2) Neotropical species seem to form a monophyletic clade, although statistical support for this is weak. 3) The split of South... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fruit fly; Diversification; Phylogeny; South América. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2008000600005 |
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| Registros recuperados: 76 | |
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