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Registros recuperados: 79
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A coupled biophysical model for the distribution of the great scallop Pecten maximus in the English Channel ArchiMer
Le Goff, Clement; Lavaud, Romain; Cugier, Philippe; Jean, Fred; Flye-sainte-marie, Jonathan; Foucher, Eric; Desroy, Nicolas; Fifas, Spyros; Foveau, Aurelie.
In this paper we used a modelling approach integrating both physical and biological constraints to understand the biogeographical distribution of the great scallop Pecten maximus in the English Channel during its whole life cycle. A 3D bio-hydrodynamical model (ECO-MARS3D) providing environmental conditions was coupled to (i) a population dynamics model and (ii) an individual ecophysiological model (Dynamic Energy Budget model). We performed the coupling sequentially, which underlined the respective role of biological and physical factors in defining P. maximus distribution in the English Channel. Results show that larval dispersion by hydrodynamics explains most of the scallop distribution and enlighten the main known hotspots for the population,...
Tipo: Text Palavras-chave: Population dynamic model; Ecophysiological model; English Channel; Pecten maximus; Spatial distribution.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00355/46642/46467.pdf
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A deterministic population dynamics model to study the distribution of a benthic bivalve with planktonic larvae (Paphia rhomboides) in the English Channel (NW Europe) ArchiMer
Savina, Marie; Menesguen, Alain.
This paper describes the development of a modelling framework to study the distribution in the English Channel of a benthic bivalve with planktonic larvae, Paphia rhomboides. Age-structured population dynamics and growth models are linked together to a compartmental transport and NPZ (Nutrients-Phytoplankton-Zooplankton) model. Used in a spin-up mode, i.e. with identical environmental forcing from a year to the next, this deterministic model converges to the same steady state whatever the initial conditions, after 15-30 years of simulation. Important features of the P. rhomboides distribution are reproduced, particularly its high abundance in the GNB (Golfe Normand-Breton) and its almost complete absence in the Western Channel. The results are discussed in...
Tipo: Text Palavras-chave: Spatial distribution; Meroplanktonic invertebrates; Growth model; Population dynamics model; Paphia rhomboides; English Channel.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/publication-3718.pdf
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A digital atlas to link ontogenic shifts in fish spatial distribution to the environment of the eastern English Channel. Dab, Limanda limanda as a case-study ArchiMer
Martin, Corinne; Vaz, Sandrine; Koubbi, Philippe; Meaden, Geoff; Engelhard, Georg H.; Lauria, Valentina; Gardel, Laure; Coppin, Franck; Delavenne, Juliette; Dupuis, Ludovic; Ernande, Bruno; Foveau, Aurelie; Lelievre, Stephanie; Morin, Jocelyne; Warembourg, Caroline; Carpentier, Andre.
The eastern English Channel, which connects the Atlantic Ocean to the North Sea through the Dover Strait, is an area where numerous and often conflicting human activities take place. A cross-border multidisciplinary project called CHARM was initiated to provide knowledge and tools for planners and decision-makers to durably manage the shared marine living resources. One such tool was an atlas of fish spatial distributions and modelled habitats, which was used here to investigate ontogenic and seasonal shifts in fish spatial distribution and habitat through a case-study, the dab Limanda limanda. Survey data for several life-history stages (eggs, larvae, coastal nurseries, < and > 1 year old) and seasons were used to map spatial patterns (using...
Tipo: Text Palavras-chave: Pleuronectidae; Limanda limanda; Eastern Channel; Spatial distribution; Modelling; Kriging; Ichthyoplankton; Trawl; CUFES.
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00008/11942/8646.pdf
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A multivariate indicator to monitor changes in spatial patterns of age-structured fish populations ArchiMer
Petitgas, Pierre; Poulard, Jean-charles.
Quantitative analysis of the spatial patterns in age-structured fish populations provides a useful complement to stock assessment methods. The spatial distribution of an age-structured population is characterized by indicators for location, dispersion and aggregation, which are estimated from survey data. The times series of spatial indicators are organised in a 3D data structure with dimensions along indicators, age classes and years. Multi factor analysis (MFA) is applied to quantify the reproducibility in time of the multivariate structure between age classes and indicators. MFA computes the mean annual pattern over the age classes. The deviation around that pattern in each year is also quantified. A multivariate indicator that characterise the spatial...
Tipo: Text Palavras-chave: Spatial distribution; Monitoring; CUSUM; Multi factor analysis.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/publication-6688.pdf
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Analyse de l'indice d’abondance des principales espèces de sparidés à travers les campagnes de chalutage de 1982 à 1992 OceanDocs
Ould Mohamed Fall, K..
Résumé : L’indice d’abondance des principales espèces de sparidés pêchées en Mauritanie a été suivi dans les campagnes de chalutage démersal du CNROP en saison froide, chaude et transition, durant la période allant de 1982 à 1992. Des affinités par zone (cas de Diplodus bellottii, Pagellus bellottii, et Sparus caeruleostictus) et par saison (Dentex macrophtalmus) ont été observées. Un indice moyen mensuel a été dégagé pour les 6 espèces étudiées et les aires de distribution ainsi que les zones d’abondance déterminées.
Tipo: Journal Contribution Palavras-chave: Spatial distribution; Abundance; Trawlers; Fishery surveys.
Ano: 1995 URL: http://hdl.handle.net/1834/255
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Biogeography and Potential Exchanges Among the Atlantic Equatorial Belt Cold-Seep Faunas ArchiMer
Olu, Karine; Cordes, Erik E.; Fisher, Charles R.; Brooks, James M.; Sibuet, Myriam; Desbruyeres, Daniel.
Like hydrothermal vents along oceanic ridges, cold seeps are patchy and isolated ecosystems along continental margins, extending from bathyal to abyssal depths. The Atlantic Equatorial Belt (AEB), from the Gulf of Mexico to the Gulf of Guinea, was one focus of the Census of Marine Life ChEss (Chemosynthetic Ecosystems) program to study biogeography of seep and vent fauna. We present a review and analysis of collections from five seep regions along the AEB: the Gulf of Mexico where extensive faunal sampling has been conducted from 400 to 3300m, the Barbados accretionary prism, the Blake ridge diapir, and in the Eastern Atlantic from the Congo and Gabon margins and the recently explored Nigeria margin. Of the 72 taxa identified at the species level, a total...
Tipo: Text Palavras-chave: Gulf of mexico; Barbados accretionary prism; Mussel bathymodiolus childressi; Hydrothermal vent communities; Deep sea vent; Spatial distribution; Family veiscomyidae; Dispersal barriers; Hydrocarbon seeps; Species diversity.
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00011/12207/8975.pdf
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Biología, ecología y explotación de la raya platana Atlantoraja platana (Günther, 1880), (Chondrichthyes, Rajidae), del golfo San Matías OceanDocs
Coller, N.M..
La “raya platana” (Atlantoraja platana), es una especie endémica del Atlántico Sudoccidental, habita desde los 22º S (Uruguay y sur de Brasil) hasta los 42º S, región del Golfo San Matías (Argentina). El área de estudio del presente trabajo fue el Golfo San Matías (41º- 42º S y 64º- 65º O). El material analizado (778 hembras y 709 machos) fue colectado durante muestreos mensuales de las capturas desembarcadas por los barcos pesqueros de la flota local (muestreos de desembarque); muestras extraídas a bordo de las embarcaciones pesqueras por el programa de observadores a bordo, durante los años 2004 y 2005 y los meses de marzo, abril y mayo de 2006; y durante la realización de campañas de investigación pesquera (primavera de 2004, 2005 y 2006). Se describió...
Tipo: Theses and Dissertations Palavras-chave: Fishery biology; Ecology; Feeding behaviour; Age (biological); Growth; Coastal environment; Morphology (animal); Reproduction (biology); Spatial distribution; Population dynamics; Abundance.
Ano: 2012 URL: http://hdl.handle.net/1834/5235
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Biological control of phytophagous arthropods in the physic nut tree Jatropha curcas L. in Brazil Agronomy
Fernandes, Flávio Lemes; Fernandes, Maria Elisa de Sena; Lopes, Elisângela Novais; Venzon, Madelaine; Diniz, Juno Ferreira da Silva; Dias, Luis Antônio dos Santos.
Jatropha curcas has a high biofuel oil content, which could replace polluting fuels, and has great potential for large scale monoculture cultivation in the conventional system. We explored the occurrence, spatial distribution and the functional response of the main phytophagous species of this plant and their natural enemies to explore the potential for conservative biological control. We began sampling phytophagous species and predators when J. curcas plants were six months old. The most common species of phytophagous insects were nymphs and adults of Empoasca kraemeri, followed by Frankliniella schultzei and Myzus persicae. Among the predators, Ricoseius loxocheles, Iphiseioides zuluagai, Araneidae, larvae and adults of Psyllobora vigintimaculata and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Predators; Parasitoids; Phytophagy; Spatial distribution; Functional response Entomologia Agrícola.
Ano: 2014 URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/17562
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Bonamia sp. (Protozoa, Haplosporidia) parásito de Ostrea puelchana D’Orbigny, (Mollusca, Bivalvia) en el Golfo San Matías (Patagonia Argentina): Histopatología, identificación e infección OceanDocs
Kroeck, M.A..
Los moluscos bivalvos son organismos sedentarios que establecen una relación íntima no sólo entre ellos, sino también con el espacio que ocupan y con sus condiciones fisicoquímicas. Sus poblaciones pueden ser hospedadoras de múltiples organismos patógenos (virus,bacterias, hongos, protistas y metazoos), cuya presencia es regulada eficazmente a niveles infra, meta y suprapoblacionales en ambientes silvestres, no provocando, salvo excepcionalmente, impactos severos. Los cultivos a escala comercial producen concentraciones de individuos, con la consiguiente alteración del medio y del equilibrio natural en la relación parásito-hospedador, generándose condiciones apropiadas para el desarrollo de enfermedades. Entre los años 1995 y 1996 se instala, en la zona...
Tipo: Theses and Dissertations Palavras-chave: Fishery biology; Marine molluscs; Parasitology; Protozoan diseases; Histopathology; Spatial distribution; Environmental conditions; Methodology; Examinations.
Ano: 2005 URL: http://hdl.handle.net/1834/5244
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Capybara (Hydrochoerus hydrochaeris) distribution in agroecosystems: a cross-scale habitat analysis. Repositório Alice
FERRAZ, K. M. P. M. de B.; FERRAZ, S. F. de B.; MOREIRA, J. R.; COUTO, H. T. Z.; VERDADE, L. M..
bitstream/item/178075/1/ID-27804-1.pdf
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Capybara; Hydrochoerus hydrochaeris; Scale; Brasil; Agroecosistema; Distribuição espacial; Agroecosystems; Brazil; Spatial distribution.
Ano: 2007 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/188254
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Características ecológicas del pulpito Octopus Tehuelchus en tres ambientes del golfo San Matías OceanDocs
Storero, L.P..
Coastal marine ecosystems are highly variable and the inherent biotic and abiotic factors of these environments can influence the bio-ecological characteristics of the living cephalopods. The presence of the small octopus “pulpito” Octopus tehuelchus in the coastal environments of San Matías Gulf has been exploited by artisanal fishermen for more than 60 years. The aim of this study is to evaluate the variations in the life cycle of the pulpito, and the factors that could account for these variations in three different coastal environments of San Matías Gulf, with differences in the physical, ecological and fisheries characteristics. This study was developed in San Antonio bay, El Fuerte and Islote Lobos. Monthly samplings (October 2005-2007) in the...
Tipo: Theses and Dissertations Palavras-chave: Fishery biology; Cephalopod fisheries; Artisanal fishing; Coastal zone management; Coastal environment; Environmental conditions; Population dynamics; Sex composition; Spatial distribution; Morphology (animal); Life cycle; Feeding; Size-at-first-maturity; Age determination; Growth; Reproduction; Reproductive behaviour.
Ano: 2010 URL: http://hdl.handle.net/1834/5023
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Caracterização estrutural em uma floresta de terra firme no estado do Amapá, Brasil PFB - Pesquisa Florestal Brasileira
Batista, Anderson Pedro Bernardina; Aparício, Wegliane Campelo da Silva; Aparício, Perseu da Silva; Santos, Vanessa Silva dos; Lima, Robson Borges de; Mello, José Marcio de.
O objetivo deste trabalho foi caracterizar a composição florística, estrutura e distribuição espacial das espécies arbóreas em uma floresta de terra firme no Estado do Amapá. Foram coletados dados dendrométricos e florísticos em 200 unidades amostrais terciárias, sendo analisadas as árvores com diâmetro a 1,30 m do solo (DAP) ≥ 40 cm. Foram calculados parâmetros fitossociológicos, distribuição espacial e índice de diversidade de Shannon. No levantamento foram amostrados 4.030 indivíduos arbóreos, distribuídos em 37 famílias e 201 espécies, sendo Goupia glabra (cupiúba) a espécie de maior valor de importância (VI). A área florestal apresenta características de floresta preservada. A amostragem revelou que a vegetação arbórea ocorre com maior proporção de...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Engenharia Florestal Fitossociologia; Florística; Distribuição espacial Phytosociology; Floristics; Spatial distribution.
Ano: 2015 URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/689
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Changes in occurrence and abundance of northern/southern flatfishes over a 20-year period in a coastal nursery area (Bay of Vilaine) and on the eastern continental shelf of the Bay of Biscay ArchiMer
Desaunay, Yves; Guerault, Daniel; Le Pape, Olivier; Poulard, Jean-charles.
Several works have demonstrated trends in the distribution of fish species relative to global warming. This study investigated whether similar trends have occurred for selected flatfish species on the continental shelf of the Bay of Biscay. These species were used as indicators and changes in their Populations were studied in a coastal nursery ground,where flatfish juveniles are concentrated as well as on the entire shelf. Previous studies analysing changes in sea surface temperature for the continental shelf indicate that winter warming occurred in the 1980s and 1990s. Sixteen autumn cruises conducted since 1981 in the Bay of Vilaine nursery area and I I autumn cruises since 1987 over the entire shelf provided data on a nearly annual basis for the...
Tipo: Text Palavras-chave: Bay of Biscay; Ocean warming; Spatial distribution; Flatfish.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-3962.pdf
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Characterizing and Comparing the Spawning Habitats of Sardine (Sardinops sagax) and Anchovy (Engraulis encrasicolus) in the Northern Benguela Region OceanDocs
Tjizoo,Mbeurora Beau.
Spawning habitats of sardine and anchovy in eastern boundary current systems are characterized in an attempt to understand the fluctuations observed in their abundance. The northern Benguela, as an eastern boundary current system, is characterized by turbulent conditions that seem to govern the variability observed in the abundance of these species. Sardine and anchovy have developed mechanisms that enable them to maximize productivity. In the northern Benguela, spawning intensity is historically known to be high in periods and vicinities where turbulence is reduced. However, it is believed that selection of conditions for spawning by these species may change withfluctuations in abundance of fish.
Tipo: Theses and Dissertations Palavras-chave: Sardine fisheries; Spawning; Anchovy fisheries; Habitat; Ecosystems; Sea surface temperature; Salinity; Spatial distribution; Climatic changes; Anthropogenic factors; Pelagic environment; Circulation; Coastlines.
Ano: 2008 URL: http://hdl.handle.net/1834/5231
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Cold-seep assemblages on a giant pockmark off West Africa: spatial patterns and environmental control ArchiMer
Olu, Karine; Caprais, Jean-claude; Fifis, Alexis; Fabri, Marie-claire; Galeron, Joelle; Budzinsky, H; Le Menach, K; Khripounoff, Alexis; Ondreas, Helene; Sibuet, Myriam.
A giant pockmark colonised by dense cold-seep assemblages near 3160 m depth along the Congo-Angola margin has been surveyed by the ROV Victor 6000. The quantitative distribution of chemosynthetic communities was mapped along the dive tracks from a video study using GIS and image mosaicking. Several types of faunal assemblages, either dominated by bivalves of the families Mytilidae (Bathmodiolus sp.) Vesicom idae (Calyptogena sp., 'Vesicomya' aff. chuni), or by Siboglinidae polychaetes (Escarpia southwardae) were mapped over the 800-m diameter pockmark area and sampled for fauna, water and sediment. The isotopic analyses (delta C-13) of tissues from symbiont-bearing species were within the range typical of nutrition via symbiosis using methane for mussels...
Tipo: Text Palavras-chave: Symbiont bearing species; Spatial distribution; Methane; Megafauna; Cold seeps.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/publication-2681.pdf
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Composição e distribuição de comunidades de peixes na planície de inundação do rio Taquari, Pantanal, MS. Infoteca-e
FREY-DARGAS, J. H.; AOKI, C.; ROSA, F. R. da.; RESENDE, E. K. de.
Este estudo teve o objetivo de caracterizar a ictiofauna da planície de inundação bacia do baixo Rio Taquari (Pantanal, MS) quanto à estrutura e diversidade de suas comunidades. Foram realizadas capturas em estações hídricas contrastantes em cinco estações de coleta de dados. Para as coletas de dados foram utilizadas redes de arrasto e tarrafas, os indivíduos capturados foram identificados in locii, fotografados e soltos vivos no local de captura. No total foram registrados 5137 indivíduos distribuídos em 54 espécies pertencentes a 18 famílias e cinco ordens. A curva de rarefação tendeu à estabilização e o estimador ?Chao 1? indicou 66 espécies para a área. A maioria das espécies foi considerada rara e acidental. Os índices de Shannon encontrados são...
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E) Palavras-chave: Ictiofauna; Diversidade; Distribuição espacial; Fish species; Diversity; Spatial distribution.
Ano: 2014 URL: http://www.infoteca.cnptia.embrapa.br/handle/doc/1000109
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Composición y distribución de huevos y larvas de peces frente a la costa ecuatoriana. Septiembre 2007 OceanDocs
Elías, E; Calderón, G.; Luzuriaga, G.; Chavarría, J..
Entre el 04 y 13 de septiembre de 2007, se realizó el crucero T07-09-04HL, para determinar la composición de huevos y larvas de peces en la zona marine costera de la costa ecuatoriana. El área de estudio se subdividió en cuatro subáreas, dentro de las cuales se ubicaron 157 estaciones donde se realizaron arrastres verticales utilizando una red CalVET. Se registro un total de 15 940 huevos de peces.m-2, correspondientes a 11 órdenes, 19 familias, 18 géneros, 18 especies y además huevos en su primer estadio embrionario. También se identificaron 23 140 larvas.m-2, que correspondieron a 12 órdenes, 32 familias, 45 géneros, 45 especies, y organismos en estado de prelarva. La distribución de las áreas de abundancia de huevos y larvas de peces determine zonas de...
Tipo: Journal Contribution Palavras-chave: Fish eggs; Fish larvae; Species composition; Spatial distribution; Ichthyoplankton.
Ano: 2010 URL: http://hdl.handle.net/1834/4835
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Conflict, Food Price Shocks, and Food Insecurity: The experience of Afghan households AgEcon
D'Souza, Anna; Jolliffe, Dean.
Revised version submitted December 2012.
Tipo: Presentation Palavras-chave: Afghanistan; Food security; Conflict; Nutrition; Poverty; Spatial distribution; Consumer/Household Economics; Food Consumption/Nutrition/Food Safety; Food Security and Poverty; International Development; D12; I3.
Ano: 2012 URL: http://purl.umn.edu/123323
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Current and potential distribution areas for Nothofagus alessandrii, an endangeredtree species from central Chile Ciencia e Investigación Agraria
Santelices,Rómulo; Drake,Fernando; Mena,Carlos; Ordenes,Rodrigo; Navarro-Cerrillo,Rafael M.
Nothofagus alessandrii ("ruil") is an endangered species native to the Maule Coastal Forest of central Chile. Previous studies have demonstrated that the current distribution of this species and rates of deforestation and fragmentation present a serious threat to the species. To address this threat, spatial and temporal variation in remnant "ruil" forest cover was analyzed for the period from 1991 to 2008. Using aerial photography and geomatic tools, the state of "ruil" forests cover in 1991 was compared to the "ruil" forests cover in 2008 and with this information, the potential distribution area of this species was calculated. The results demonstrate that the current area of "ruil" forest is approximately 314 ha, with a net loss of 42 ha (12% of the...
Tipo: Journal article Palavras-chave: Deforestation; Forest tree; Nothofagus alessandrii; Potential distribution; Ruil; Spatial distribution.
Ano: 2012 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202012000300011
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Densidade de plantio e idade de colheita de quebra-pedra [Phyllanthus amarus (Schumach. & Thonning) genótipo Unicamp-CPQBA 14] na produtividade de filantina. Repositório Alice
MAIA-ALMEIDA, C. I.; MING, L. C.; MARQUES, M. O. M.; MAGALHÃES, P. M. de; QUEIROZ, S. C. do N. de; SCRAMIN, S.; MISCHAN, M. M.; MONTANARI JUNIOR, I.; PEREIRA, B.; FERREIRA, M. I..
RESUMO: Avaliou-se o efeito da densidade de plantio e da idade de Phyllanthus amarus CPQBA-14, sobre o teor e produtividade de filantina. O delineamento experimental foi em blocos ao acaso, em esquema fatorial 4 x 6, com cinco repetições, envolvendo 4 tratamentos de densidade de plantio (400.000 pl ha-1; 200.000 pl ha-1; 100.000 pl ha-1 e 66.667,68 pl ha-1) com 6 colheitas (30, 45, 60, 75, 90 e 105 dias após o transplante (DAT)). Os dados foram submetidos a Análise de Variâncias e Regressão (P>0.001). Para o teor de Filantina, foram observados efeitos significativos e independentes dos tratamentos de idade da planta na colheita e densidade de plantio. O teor de filantina aumentou linearmente com a idade da planta, atingindo o máximo aos 105 DAT, com...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Quebra-pedra; Cultivo de plantas medicinais; Ecofisiologia; Qualidade fitoquímica; Planta medicinal; Plantio; Espaçamento; Phyllanthus amarus; Medicinal plants; Planting; Spatial distribution.
Ano: 2012 URL: http://www.alice.cnptia.embrapa.br/handle/doc/933640
Registros recuperados: 79
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