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| Registros recuperados: 109 | |
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| Mahevas, Stephanie; Trenkel, Verena; Doray, Mathieu; Peyronnet, Arnaud. |
| Several factors affect trawl catchability: (i) gear and vessel technical characteristics, (ii) anthropogenic factors, and (iii) biological factors. The objectives of this study were to assess the relative contribution of each factor to variations in hake (Merluccius merluccius) landings by the French trawler fleet operating on the shelf of the northern Bay of Biscay (ICES Subdivision VIIIa). Using generalized linear models, the impact of technical and anthropogenic factors was evaluated using landings per unit effort (lpue) obtained from logbooks. Variations in hake lpue were explained primarily by anthropogenic factors. For studying the biological components of catchability, the results of a scientific trawl survey in July 2006 involving three similar... |
| Tipo: Text |
Palavras-chave: Accessibility; Beam trawl; Catchability; Fishing power; GLMM; Spatial distribution. |
| Ano: 2011 |
URL: http://archimer.ifremer.fr/doc/00021/13244/10287.pdf |
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| 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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| 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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| Miranda,Carmélia S.; Vasconcellos,Alexandre; Bandeira,Adelmar G.. |
| The spatial distribution, abundance, and feeding habits of termites in a sugar cane plantation in Northeast Brazil were studied, and based on these ecological parameters, the pest status of the species was evaluated. Four species were found: Amitermes nordestinus Mélo & Fontes, Cylindrotermes nordenskioeldi Holmgren, Nasutitermes coxipoensis (Holmgren) and Syntermes nanus Constantino, which we reported by the first time in association to sugar cane. The abundance and spatial distribution (vertical and horizontal) of the termites were influenced mainly by the plant root biomass and soil organic matter. C. nordenskioeldi is harmful to sugar cane, A. nordestinus is a potential pest, while N. coxipoensis and S. nanus are not potential pests. The... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Isoptera; Species richness; Abundance; Spatial distribution; Feeding habit. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2004000200015 |
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| Garcia,Maria A.; Oliveira,Lenita J.; Oliveira,Maria C.N. de. |
| The aggregation behavior of Phyllophaga cuyabana (Moser) was studied and the hypothesis that the cluster distribution of larvae of this pest into the soil is related to the sites where females from the previous generation had aggregated for mating was investigated. Field observations and greenhouse experiments carried out in Londrina County, State of Paraná, South Brazil, indicated that: a) during flight, adult females of P. cuyabana select plants, which are more conspicuous for landing and/or attracting males; b) tall plants, nearby soybean fields, might be preferred because female adults do not move far from the mating sites before digging themselves into the soil to lay eggs; c) high density of eggs and larvae occurs close to the adult aggregation... |
| Tipo: Info:eu-repo/semantics/report |
Palavras-chave: Glycine max; Scarabaeoidea; Soil pest; Spatial distribution. |
| Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2003000400002 |
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| Silva,Samuel Elias; Assunção,Wilhan R. C.; Duca,Charles; Penha,Jerry. |
| The combined demand over a certain resource may exceed its immediate supply, which can then lead to competition between individuals. This competition may result in territorial behavior. In this study we determine the density and spatial distribution, describe the interactions arising from territorial behavior and evaluate the costs of keeping the territories defended by adults of Parodon nasus. The study was conducted in Camarinha Stream located in the Serra das Araras Ecological Station, Porto Estrela, State of Mato Grosso, Brazil. The density was constant throughout the length of the stream, with a mean (± standard deviation) of 1.01 ind./m² (± 0.14). Our results show that the spatial distribution of individuals in the area ranged between uniform and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Spatial distribution; Territory size; Foraging; Resting time; Territory defense. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252009000400017 |
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| Langeani,Francisco; Casatti,Lilian; Gameiro,Helena Seixas; Carmo,André Bellucco do; Rossa-Feres,Denise de Cerqueira. |
| The structure of the fish communities of a pool and a rapid in the ribeirão Santa Bárbara is described. This stream of 5th order is a direct tributary of the rio Tietê in the system of the upper rio Paraná. Thirty three species, from nine families and three orders, were referred in the two mesohabitats: the pool with 31 species, and the rapid with 18. Orders Characiformes, Siluriformes, and Perciformes presented the greatest number of species in the two mesohabitats. The families Characidae and Loricariidae were the most specious, followed by Cichlidae in the pool, and by Parodontidae in the rapid. Most species were accidental, 17 in the pool, and 10 in the rapid, and only six were constant in the two mesohabitats. The greatest diversity and evenness... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Seasonality; Spatial distribution; Upper rio Paraná system; Niche breadth; Diversity; Adventitious streams. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252005000200009 |
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| Esteves,Katharina Eichbaum; Silva,Marcelo Horikoshi Candido; Nanini-Costa,Maressa Helena; Petesse,Maria Letizia. |
| ABSTRACT This study aimed to determine whether fish species occupy different mesohabitats, as defined by specific criteria of substrate types in Atlantic Forest blackwater streams. We sampled fourteen coastal blackwater rivers along the coast of São Paulo State, Brazil, during the low-flow season (June-September/2016). For each stream, we selected three mesohabitat types (sand, leaf-litter and trunks) in a 100 m river stretch. We sampled 41 mesohabitats, 31 of which contained fish, resulting in 15 species. When multivariate analysis of variance (MANOVA) was applied to the mesohabitat abiotic variables, no significant differences were indicated between them. ANOSIM for species density and biomass and Redundancy Analyses (RDAs) for species density, biomass... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Community structure; Leaf-litter; Mesohabitat; Spatial distribution; Substrate types. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252019000100212 |
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| Baumgartner,Gilmar; Nakatani,Keshiyu; Gomes,Luiz Carlos; Bialetzki,Andréa; Sanches,Paulo Vanderlei; Makrakis,Maristela Cavicchioli. |
| The purpose of this study was to evaluate the role of abiotic factors on fish larvae occurrence. Samplings were carried out monthly at 12 stations (grouped in four areas) in the Amambaí, Ivaí and Paraná rivers and in the Itaipu Reservoir (upper Paraná River basin), from October 1994 to January 1995 (spawning season). Simultaneously, we obtained water temperature, pH, electrical conductivity, dissolved oxygen, water level, water velocity, and rainfall. Principal Component Analyses (PCA) and Detrended Correspondence Analyses (DCA) were applied to summarize abiotic and larvae density data, respectively. Amambaí River differed significantly from the other areas in relation to abiotic factors. Itaipu Reservoir differed significantly from the other areas... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Larval ecology; Spatial distribution; Floodplain; Itaipu reservoir; Larval drift. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252008000400002 |
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| 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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| 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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| Kochedi, W.; Hattour, A.; Said, K.. |
| Une campagne de prospection planctonique à été réalisée entre le 24 juin et le 7 juillet 2008 au large des côtes Est de la Tunisie depuis le Cap bon jusqu’à Ras Kapoudia. Les objectifs de cette campagne consistaient à étudier l’assemblage larvaire des poissons téléostéens et d’évaluer l’influence des facteurs environnementaux sur leur distribution spatiale. Au total 10832 larves ont été identifiées appartenant à 46 taxons. La distribution spatiale des larves a montré une grande variabilité interspécifique. En effet, plusieurs facteurs sont intervenus dans leur distribution. Nous citons en premier lieu la circulation complexe des masses d’eaux, qui est responsable de la répartition des larves bien éloignées des aires de ponte. Le gradient de la profondeur... |
| Tipo: Journal Contribution |
Palavras-chave: Fish larvae; Environmental factors; Spatial distribution. |
| Ano: 2011 |
URL: http://hdl.handle.net/1834/4692 |
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| 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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| 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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| Registros recuperados: 109 | |
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