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Registros recuperados: 18
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A population of Lychnophora Ericoides Mart. (arnica) (Asteraceae) is prone to extinction in a savanna of Central Brazil. Repositório Alice
RIBEIRO-SILVA, S.; MEDEIROS, M. B.; LIMA, V. V. F.; GIROLDO, A. B.; NORONHA, S. E. de; RESENDE, F. O..
bitstream/item/171141/1/population-of-lychnophora-ericoides-mart-arnica-asteraceae-is-prone-to-extinction-in-a-savanna-of-central-brazil.pdf
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Life table response experiment; Matrix population models; Population growth rate; Transient dynamics; Demography; Wildfires.
Ano: 2017 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1085504
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Agricultura na Amazônia Brasileira: documento nacional brasileiro. Repositório Alice
SEMINÁRIO INTERNACIONAL SOBRE A AGRICULTURA DA AMAZÔNIA, 1., 1984, Belém, PA..
Caracteristicas edafo-climaticas e socioeconomicas da regiao; A agricultura na amazonia brasileira; Fronteiras de conhecimentos atingidos pela pesquisa agropecuaria regional; Desempenho da assistencia tecnica e extensao rural na ultima decada.
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: Clima: Amazonia; Vegetacao; Solo; Demografia; Transporte; Agricultura; Programa de desenvolvimento; Extensao rural; Terra agricola; Climate; Vegetation; Soil; Agriculture; Development; Program; Transport; Agricultural extension; Demography.
Ano: 1984 URL: http://www.alice.cnptia.embrapa.br/handle/doc/84661
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Are Brazil nut populations threatened by fruit harvest? Repositório Alice
BERTWELL, T. D.; KAINER, K. A.; CROPPER JUNIOR, W. P.; STAUDHAMMER, C. L.; WADT, L. H. de O..
Harvest of Brazil nuts from the large, iconic tree Bertholletia excelsa generates substantial income for smallholders, providing a strong incentive to conserve the mature forests where it grows. Although much previous work has focused on the impact of nut harvest on new seedling recruits into B. excelsa populations, the connection between harvest rates and long-term population stability is still unclear. Moreover, there is additional uncertainty for Brazil nut management in terms of population response to climate change and other anthropogenic influences. We drew on 14 years of research in two sites in Acre, Brazil with different B. excelsa nut harvest intensities (39% and 81%), to produce stochastic and deterministic matrix population models which...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Bertholletia excelsa; Demography; Matrix population model; Rainfall; Sustainable harvest; Tropical forest; Modelo de população matricial; Colheita sustentável; Floresta tropical.
Ano: 2017 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1077079
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Biotécnicas da reprodução animal aplicadas à conservação de cervídeos. Infoteca-e
ZÚCCARI, C. E. S. N.; SERENO, J. R. B..
The present work aimed to present a literature research about two deer species - Blastocerus dichotomus (llliger, 1815) - Cervo-do-pantanal and Ozotocerus bezoarticus (Linnaeus, 1758) - Veado-campeiro, due to their importance in Central Brazil. The main aspects studied were: species biology, density and populational distribution; factors related to their decreased numbers; and the use of biotechniques of animal husbandry for propagation and conservation of deer, as environmental compensation. Using available data in the literature, it is possible to realize that depending on the region studied, both deer species showed population fluctuation in the past years. Apart local population density, both are part of the red data book on native Brazilian species of...
Tipo: Documentos (INFOTECA-E) Palavras-chave: Cervo; Reprodução animal; Densidade demográfica; Biologia animal; Preservação; Veado; Cervidae; Reproduction; Demography; Zoology; Preservation.
Ano: 2006 URL: http://www.infoteca.cnptia.embrapa.br/handle/doc/570264
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Comparative Analysis of Stability-Genetic Diversity in Seagrass (Posidonia oceanica) Meadows Yields Unexpected Results ArchiMer
Arnaud-haond, Sophie; Marba, Nuria; Diaz-almela, Elena; Serrao, Ester A.; Duarte, Carlos M..
The diversity-stability relationship is the subject of a long-standing debate in ecology, but the genetic component of diversity has seldom been explored. In this study, we analyzed the interplay between genetic diversity and demographic responses to environmental pressures. This analysis included 30 meadows formed by the Mediterranean endemic seagrass, Posidonia oceanica, showing a wide range of population dynamics ranging from a near equilibrium state to steep decline due to strong environmental pressures close to aquaculture installations. Our results show that sedimentation rates are much better predictors of mortality than clonal or genetic components. An unexpected positive trend was observed between genotypic diversity and mortality, along with a...
Tipo: Text Palavras-chave: Seagrass; Demography; Clonality; Genetic richness; Diversity-stability; Posidonia oceanica.
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00006/11693/8498.pdf
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El aprovechamiento y la estructura poblacional de Agave kerchovei Lem., en Tehuacán-Cuicatlán, México. Colegio de Postgraduados
Brena Bustamante, Paulina.
El Valle de Tehuacán-Cuicatlán (VTC) es una provincia de gran riqueza etnoflorística en la que resalta el género Agave por su riqueza específica y los múltiples recursos que ofrece. Los agaves se reproducen por la vía sexual solo una vez en su ciclo de vida (semélparos). La información sobre Agave kerchovei Lem., “cacayas” (botones florales) o “Rabo de León” (planta) documenta que es de interés particular por el aprovechamiento de los botones florales. El objetivo de este estudio fue conocer el estado de dos poblaciones de A. kerchovei mediante un análisis etnobotánico, espacial y ecológico en dos áreas de aprovechamiento del VTC. En San Rafael, Puebla y San Gabriel Casa Blanca, Oaxaca, se realizaron entrevistas a hombres y mujeres; se describieron las...
Palavras-chave: Cacayas; Rabo de León; Etnobotánica; Reproducción; Germinación; Patrón de distribución; Demografía; Ethnobotany; Reproduction; Germination; Spatial distribution pattem; Demography; Maestría; Botánica.
Ano: 2012 URL: http://hdl.handle.net/10521/715
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Estrutura e dinâmica de uma população de Calophyllum brasiliense Camb. em floresta higrófila do sudeste do Brasil Rev. Bras. Bot.
MARQUES,MÁRCIA C. M.; JOLY,CARLOS ALFREDO.
As estruturas de tamanho e espacial de uma população de Calophyllum brasiliense (Clusiaceae) foram estudadas em uma área de 3600 m2 de floresta higrófila localizada em Brotas, SP. No primeiro censo, foram marcados 1658 indivíduos e, após um ano, este número havia aumentado para 1706. A estrutura de tamanho não mudou durante o período de estudo, com predomínio de plântulas (indivíduos £ 0,2 m) e jovens (> 0,2 - 2 m) e menor número de subadultos (> 2 - 10 m) e adultos (> 10 m). A mortalidade em plântulas (29,7%) e jovens (5,3%) foi bem maior que em subadultos (0,7%) e adultos (0%), e teve como causa principal o soterramento na época chuvosa. O maior número de plantas novas concentrou-se nos locais mais baixos da área, onde sementes...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Swamp forest; Population dynamics; Demography; Calophyllum brasiliense.
Ano: 2000 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042000000100012
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Fertility in South Dublin a Century Ago: A First Look AgEcon
Guinnane, Timothy W.; Moehling, Carolyn M.; Grada, Cormac O.
Ireland's relatively late and feeble fertility transition remains poorly-understood. The leading explanations stress the role of Catholicism and a conservative social ethos. This paper reports the first results from a project that uses new samples from the 1911 census of Ireland to study fertility in Dublin and Belfast. Our larger project aims to use the extensive literature on the fertility transition elsewhere in Europe to refine and test leading hypotheses in their Irish context. The present paper uses a sample from the Dublin suburb of Pembroke to take a first look at the questions, data, and methods. This sample is much larger than those used in previous studies of Irish fertility, and is the first from an urban area. We find considerable support for...
Tipo: Working or Discussion Paper Palavras-chave: Ireland; Fertility; Demography; Labor and Human Capital; J1; N3.
Ano: 2001 URL: http://purl.umn.edu/28434
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How does fishing alter marine populations and ecosystems sensitivity to climate? ArchiMer
Planque, Benjamin; Fromentin, Jean-marc; Cury, Philippe; Drinkwater, Kenneth F.; Jennings, Simon; Perry, R. Ian; Kifani, Souad.
Evidence has accumulated that climate variability influences the state and functioning of marine ecosystems. At the same time increasing pressure from exploitation and other human activities has been shown to impact exploited and non-exploited species and potentially modify ecosystem structure. There has been a tendency among marine scientists to pose the question as a dichotomy, i.e., whether (1) "natural" climate variability or (2) fishery exploitation bears the primary responsibility for population declines in fish populations and the associated ecosystem changes. However, effects of both climate and exploitation are probably substantially involved in most cases. More importantly, climate and exploitation interact in their effects, such that climate may...
Tipo: Text Palavras-chave: Resilience; Marine ecosystems; Demography; Climate fishing interactions.
Ano: 2010 URL: http://archimer.ifremer.fr/doc/2010/publication-7384.pdf
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Lomé, 100 ans de croissance démographique OceanDocs
Janssens, M..
L' urbanisation constitue pour les pays d Afrique sub-saharienne l élément clé de son processus de peuplement. Commencé plus tard que dans les autres régions du monde, le peuplement s' est accéléré rapidement, donnant lieu à une mobilité vers les villes depuis la fin de la Deuxième Guerre mondiale et surtout après les indépendances (Snrech 1994, Dubresson 1996). La région entre dans un processus d urbanisation extrêmement rapide, caractérisé par un processus de restructuration et de concentration du peuplement au bénéfice des villescapitales. Kalasa (1993) caractérise la vitesse du processus d urbanisation comme tout à fait exceptionnelle, sans égale dans aucune région du monde ni à aucune autre époque.
Tipo: Proceedings Paper Palavras-chave: Demography.
Ano: 1998 URL: http://hdl.handle.net/1834/1193
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Long-term studies of Littorina obtusata and Littorina saxatilis populations in the White Sea ArchiMer
Sergievsky, So; Granovitch, Ai; Sokolova, Im.
The results of a 14-year survey of the populations of L. saxatilis and L. obtusata from one locality in the Kandalaksha Bay of the White Sea are presented. The periwinkles were found to be hosts of 10 castrating trematode species. Microphallus piriformes was the most abundant species with infection prevalence often exceeding 50%. Year-to-year variation of the infection prevalence was correlated in the two host species, probably reflecting fluctuations in the influx of trematode eggs to the shore. Long-term changes in population density are associated with the variation of the age structure of the winkles, suggesting a dependence of the population density on the success of the recruitment. Fluctuations in abundance and age composition were correlated in L....
Tipo: Text Palavras-chave: Long-term; Population dynamics; Demography; Littorina; Trematoda.
Ano: 1997 URL: http://archimer.ifremer.fr/doc/00093/20395/18062.pdf
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Macroeconomic Implications of Demography for the Environment: A Life-Cycle Perspective AgEcon
Pautrel, Xavier.
This article studies how demography affects the outcome of the environmental policy in a macro-economic perspective, incorporating age-earning profiles in an OLG model à la Blanchard (1985) to capture the age structure effect of the demographic shocks. It first demonstrates, conversely to previous works of the related literature that a decrease in the birth rate may lower the steady-state per capita stock of physical capital even if the aggregate labor supply is exogenous. It also demonstrates that the ageing of population influences the macro-economic impact of the environmental policy according to the cause of the ageing and the life-cycle earnings assumption. Thus, with decreasing age-earning profiles, a lower birth rate reduces the detrimental impact...
Tipo: Working or Discussion Paper Palavras-chave: Demography; Environment; Environmental Economics and Policy; Q56.
Ano: 2009 URL: http://purl.umn.edu/50325
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NEON terrestrial field observations: designing continental-scale, standardized sampling. Repositório Alice
KAO, R. H.; GIBSON, C. M.; GALLERY, R. E.; MEIER, C. L.; BARNETT, D. T.; DOCHERTY, K. M.; BLEVINS, K. K.; TRAVERS, P. D.; AZUAJE, E.; SPRINGER, Y. P.; THIBAULT, K. M.; MCKENZIE, V. J.; KELLER, M.; ALVES, L. F.; HINCKLEY, E-L. S.; PARNELL, J.; SCHIMEL, D..
Rapid changes in climate and land use and the resulting shifts in species distributions and ecosystem functions have motivated the development of the National Ecological Observatory Network (NEON). Integrating across spatial scales from ground sampling to remote sensing, NEON will provide data for users to address ecological responses to changes in climate, land use, and species invasion across the United States for at least 30 years. Although NEON remote sensing and tower sensor elements are relatively well known, the biological measurements are not. This manuscript describes NEON terrestrial sampling, which targets organisms across a range of generation and turnover times, and a hierarchy of measurable biological states. Measurements encompass species...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Abundance; Biodiversity; Biogeochemistry; Demography; Disease; Ecohydrology; Long-term monitoring; National Ecological Observatory Network; Open-access data; Phenology.
Ano: 2013 URL: http://www.alice.cnptia.embrapa.br/handle/doc/958227
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Profile of Hired Farmworkers, A 2008 Update AgEcon
Kandel, William.
Hired farmworkers make up a third of the total agricultural labor force and are critical to U.S. agricultural production, particularly in labor-intensive sectors such as fruits and vegetables. The hired farmworker labor market is unique because it includes a large population of relatively disadvantaged and often unauthorized workers, a portion of whom migrate to, and within, the United States. Recent economic and demographic trends, such as changing agricultural production methods that permit year-round employment, expanding immigrant populations in nonmetropolitan counties, and growing concerns over U.S. immigration policies, have elicited increased interest in hired farmworkers. This 2008 profile serves as an update to the 2000 Economic Research Service...
Tipo: Report Palavras-chave: Hired farmworkers; Farm labor; Agriculture; Migrant; Immigrant; Farm structure; Demography; Legal status; Employment; Poverty; Housing; Social services; Health; Agricultural and Food Policy; Community/Rural/Urban Development; Crop Production/Industries; Farm Management; Financial Economics; Labor and Human Capital; Production Economics.
Ano: 2008 URL: http://purl.umn.edu/56461
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Quelques aspects de la population de Lomé dans sa dynamique de peuplement OceanDocs
Dovi, Q..
La croissance rapide de la ville de Lomé est l'un des facteurs qui ont influencé le plus 1e développement du Togo au cours du XXè siècle et marquera le XXIè siècle.
Tipo: Proceedings Paper Palavras-chave: Demography.
Ano: 1998 URL: http://hdl.handle.net/1834/1198
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Temporal trends in age and size at maturation of four North Sea gadid species: cod, haddock, whiting and Norway pout ArchiMer
Marty, Lise; Rochet, Marie-joelle; Ernande, Bruno.
Younger ages and smaller sizes at maturation have been observed in commercial fish stocks over the last century. We establish that age and length at 50% proportion mature (i.e. the proportion of mature individuals in a population or the probability that an individual is mature) decreased from the 1970s to the 2000s in North Sea cod Gadus morhua, haddock Melanogrammus aeglefinus and whiting Merlangius merlangus, but not in Norway pout Trisopterus esmarkii. The potential contributions of demography, phenotypic plasticity and evolution to these trends were assessed. First, maturation trends were extricated from demographic effects and growth-dependent plasticity by estimating probabilistic maturation reaction norms (PMRNs). PMRN midpoints have significantly...
Tipo: Text Palavras-chave: Probabilistic maturation reaction norm; Demography; Phenotypic plasticity; Fisheries-induced evolution; Life-history strategy; Maturity; Growth; Reproductive investment.
Ano: 2014 URL: https://archimer.ifremer.fr/doc/00180/29152/27559.pdf
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The Fertility of the Irish in America in 1910 AgEcon
Guinnane, Timothy W.; Moehling, Carolyn M.; Grada, Cormac O.
In most western societies, marital fertility began to decline in the nineteenth century. But in Ireland, fertility in marriage remained stubbornly high into the twentieth century. Explanations of Ireland’s late entry to the fertility transition focus on the influence of the Roman Catholic Church in Irish society. These arguments are often backed up by claims that the Irish outside of Ireland behaved the same way. This paper investigates these claims by examining the marital fertility of Irish Americans in 1910 and produces three main findings. First, the Irish in America had smaller families than both the rural and urban Irish and their fertility patterns show clear evidence of fertility control. Second, despite the evidence of control, Irish-Americans...
Tipo: Working or Discussion Paper Palavras-chave: Ireland; United States; Fertility; Demography; Immigration; Labor and Human Capital; J13; N3.
Ano: 2002 URL: http://purl.umn.edu/28386
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Why demographic and modeling approaches should be adopted for estimating the effects of pesticides on biocontrol agents. Repositório Alice
STARK, J. D.; SUGAYAMA, R. L.; KOVALESKI, A..
bitstream/item/195917/1/Stark2006-Article-WhyDemographicAndModelingAppro.pdf
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Life table response experiments; LC50; Enologia; Demography; Models; Pesticides; Toxicology.
Ano: 2007 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/542702
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