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| Registros recuperados: 115 | |
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| González-Ferrer, S.; Caballero, H.; Alcolado, P.M.; Jiménez, A.; Martín, F.; Cobián, D.. |
| Se evaluaron 11 sitios de buceo de los arrecifes de “María la Gorda”, costa suroccidental de Pinar del Río, Cuba, en diciembre del año 2003. Se empleó el método del marco cuadrado de 1m de lado. Se encontraron 35 especies de corales pétreos. Las más abundantes fueron Agaricia agaricites, Siderastrea siderea, Porites astreoides, Montastraea franksi y M. faveolata. Los índices de riqueza de especies, heterogeneidad, y equitatividad fueron moderadamente altos a altos, lo que sugiere condiciones ambientales favorables y casi constantes. La densidad por estación resultó moderadamente alta e igualmente indica buenas condiciones para los corales pétreos. La comparación de los datos obtenidos en los sitios de buceo con la estación de referencia sugiere que no ha... |
| Tipo: Journal Contribution |
Palavras-chave: Species diversity; Species diversity; Http://aims.fao.org/aos/agrovoc/c_33954. |
| Ano: 2007 |
URL: http://hdl.handle.net/1834/3101 |
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| Revelo, W.. |
| Durante el 2009 (excepto mayo, agosto y septiembre), se analizaron un total de 3 772 especímenes de peces conformados por 16 especies, predominando la dica con 1561 individuos (42,3%), las menos capturadas fueron róbalo y chame con un individuo cada una (0,03%). La proporción de sexo macho hembra, talla promedio de captura y media de madurez sexual de las principales especies de peces fue: dama (1: 1,16; 23,7 y 20 cm LT), dica (1: 1,15; 17,3 y 16 cm LT), guanchiche (1: 1,2; 29 y 20 cm LT), ratón (1: 1,25; 23,5 y 19 cm LT) y bocachico (1:1,06; 21,6 y 20 cm LT). En los estadios de madurez sexual, la mayoría de las especies se encontraron en estadio I y II correspondientes a individuos hembras inmaduras; sin embargo, para el guanchiche predominaron las... |
| Tipo: Journal Contribution |
Palavras-chave: Rivers; Species diversity; Sexual maturity; Growth rate; Catch composition; Freshwater fish. |
| Ano: 2010 |
URL: http://hdl.handle.net/1834/4790 |
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| Cruz, M.. |
| Of the analysis of five rocky areas in the intertidal zone of the Esmeraldas province: Tachina, Balao, Súa-Atacames, Galera and Mompiche, from the limit of the high tide to the limit of the low tide, were founded nine (9) species of drilling bivalves molluscs, that belong to three families: Mytilidae, Petricolidae and Pholadidae. Petricola denticulata was the most abundant species in the Esmeraldas province and represents the 26.1% among all species, whiles the sites or stations that were observed the greater abundance of organisms were Balao and Súa-Atacames with 39.1% each one. The greater richness of species was observed in Súa-Atacames, having reprsented 50% of the total diversity. In Tachina station, drilling rock organism were not observed. The... |
| Tipo: Journal Contribution |
Palavras-chave: Marine molluscs; Abundance; Species diversity; Drilling. |
| Ano: 2013 |
URL: http://hdl.handle.net/1834/5755 |
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| Tapia, M.E.; Naranjo, Ch.. |
| Se analizaron un total de 58 muestras en La Libertad y 54 muestras de agua marina costera en Manta durante el evento La Niña 1999-2000. Se elaboraron mapas de distribución de clorofila a, y la relación con los parámetros físicos y químicos. Las condiciones físicas durante el desarrollo del evento La Niña 1999-2000, no siguieron un patrón definido, sino que han presentado características particulares para cada región del Océano Pacífico Sur. En Ecuador se observó que la productividad biológica aumentó considerablemente en La Libertad durante el año 2000 existiendo la presencia de afloramientos con núcleos de clorofila a, altas concentraciones celulares e incremento de la abundancia relativa de importantes especies de diatomeas. |
| Tipo: Journal Contribution |
Palavras-chave: Chlorophylls; Biological production; Upwelling; El Nino phenomena; Marine water; Species diversity; Diatoms. |
| Ano: 2010 |
URL: http://hdl.handle.net/1834/4214 |
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| Lin, Gengming; Yang, Qingliang; Lin, Weihan; Wang, Yu. |
| Based on 4 cruise surveys from July 2006 to October 2007 in the Taiwan Strait, the species composition, community structure and spatio-temporal distribution of dinoflagellate were studied. A total of 131 dinoflagellates belonging to 18 genera were identified. The population was dominated by hyperthermal and hyperhaline species accounting for 72.52% of the total species. Eurythermal and euryhaline species were the second most common one accounting for 25.19% of the total species. It was only 2.29% for neritic species. The maximum species number occurred in summer, while the maximum cell density appeared in spring. The average dinoflagellate cell density was 404.96×104 cells/m3. It showed that the dinoflagellate cell density increased from the nearshore... |
| Tipo: Journal Contribution |
Palavras-chave: Planktonic algae; Distribution; Seasonal distribution; Species diversity. |
| Ano: 2012 |
URL: http://hdl.handle.net/1834/5839 |
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| Yasindi, A. W.; Taylor, W. D.. |
| Planktonic ciliates were studied in 17 tropical East African lakes of different salinity and trophic status. Oligotrichs (e.g., Strombidium, Strobilidium and Halteria) and scuticociliates (e.g., Cyclidium, Pleuronema, Cristigera), dominated the ciliate communities. Conductivity and trophic status were the most important environmental variables influencing the distribution of ciliate species in East African lakes. Herbivorous oligotrichs were important in oligotrophic and mesotrophic lakes, as they are in temperate and subtropical lakes, but their importance decreased with increasing chlorophyll a concentration and conductivity. On the other hand, the importance of scuticociliates (primarily bacterivores) increased with increasing chlorophyll a and... |
| Tipo: Proceedings Paper |
Palavras-chave: Freshwater lakes; Abundance; Biomass; Pelagic environment; Salinity; Plankton; Community composition; Oligotrophic lakes; Aquatic communities; Regression analysis; Tropical lakes; Species diversity; Plankton; Freshwater. |
| Ano: 2006 |
URL: http://hdl.handle.net/1834/5311 |
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| Fiera,Cristina. |
| The objective of this work was to evaluate the effects of pollutants on the abundance and diversity of Collembola in urban soils. The research was carried out in three parks (Cişmigiu, Izvor and Unirea) in downtown Bucharest, where the intense car traffic accounts for 70% of the local air pollution. One site in particular (Cişmigiu park) was highly contaminated with Pb, Cd, Zn and Cu at about ten times the background levels of Pb. Collembola were sampled in 2006 (July, September, November) using the transect method: 2,475 individuals from 34 species of Collembola were collected from 210 samples of soil and litter. Numerical densities differed significantly between the studied sites.The influence of air pollutants on the springtail fauna was visible at the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Heavy metals; Soil contamination; Species diversity; Urban parks. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2009000800010 |
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| Hu,FL; Liu,B; Liu,ZM; Fang,YT; Busso,CA. |
| Grasslands are one of the most widespread landscapes worldwide, covering approximately one-fifth of the world's land surface, where grazing is a common practice. How carbon storage responds to grazing in steppes remains poorly understood. We quantified the effects of grazing on community composition and species diversity, and carbon storage in two typical grasslands of northeastern China, one in Horqin and the other one in Hulunbeier. In both grasslands, grazing did not infuence plant species diversity. However, it substantially decreased aboveground carbon by 31% and 54% in Horqin and Hulunbeier, respectively. Fenced and grazing treatments showed a similar belowground carbon at both locations. The predominant carbon pool in the study grassland ecosystem... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Species diversity; Carbon allocation; Carbon stock; Optimal partitioning; Community heterogeneity; Soil depth. |
| Ano: 2015 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572015000100028 |
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| Zhou,C; Busso,C; Liu,J; Yang,YG; Sun,Y; Fang,YZ; Zhang,QQ; Zhou,YB; Wang,YN; Zhang,Z; Wang,ZW; Yang,YF. |
| The objective of this study was to analyze the relationships between total aboveground plant biomass versus altitude, latitude, longitude, mean annual temperature, mean annual precipitation, and species diversity. Simple linear regression analysis was used to study these relationships. Results showed that altitude was significantly, positively (R² = 0.038, P<0.01) related with total plant aboveground biomass. Meanwhile, when longitude (R² = 0.124, P<0.001) and latitude (R² = 0.221, P<0.001) increased, total aboveground biomass decreased. The relationship between biomass and mean annual precipitation was significantly, positively linear (R² = 0.149, P<0.001). Mean annual temperature was signifcantly, negatively correlated with biomass (R² =... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Productivity; Species diversity; Climate; Grasslands. |
| Ano: 2016 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572016000100017 |
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| Metzger,Jean Paul; Goldenberg,Renato; Bernacci,Luis Carlos. |
| O objetivo deste trabalho é de comparar a diversidade específica e a estrutura comunitária de mata de várzea (MV), inundada anualmente, e de mata mesófila semidecídua submontana (MS) situada em áreas adjacentes a cursos dágua, mas que não sofre inundações freqüentes. Para realizar esta comparação, foram estudados 15 fragmentos de mata ao longo do rio Jacaré-Pepira, no centro do estado de São Paulo. Utilizou-se o método de quadrantes para amostrar os indivíduos dos estratos arbóreo e arbustivo com 3 cm ou mais de diâmetro do caule a 1,3 m de altura do solo. Os fragmentos de MV apresentam uma baixa diversidade (1,6 nats/tree <FONT FACE="Symbol">£</font> H <FONT FACE="Symbol">£</font> 2,9 nats/ind.) em relação aos fragmentos de MS... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Phytosociological structure; Species diversity; Riparian forests. |
| Ano: 1998 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84041998000300012 |
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| Farias,Patrícia Menegaz de; Hernández,Malva Isabel Medina. |
| ABSTRACT Knowing the biodiversity of dung beetles in agricultural and livestock environments is the basis for understanding the contribution that these organisms make in nutrient cycling and ecosystem functions. The aim of the present study was to investigate the structure of copronecrophagous dung beetle communities inhabiting the main agroecosystems in southern Brazil and correlate the presence of these organisms with soil properties. From December 2012 to April 2013, samples of dung beetles were taken in the municipality of Tubarão, Santa Catarina, Brazil (28° 28’ S; 48° 56’ W) in corn, bean, and sugarcane crops, and in cattle pastures. Beetles were captured in 16 sampling sites, four from each agroecosystem, following a standardized methodology: 10... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Agricultural-livestock systems; Dung beetles; Ecology; Soil attributes; Species diversity. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832017000100407 |
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| Almeida,Paulo Silva de; Leite,Jhoy Alves; Araújo,Aldecir Dutra de; Batista,Paulo Mira; Touro,Rosineide Barbosa da Silva; Araújo,Vânia Santos; Souza,Edson José de; Rodrigues,João Batista; Oliveira,Gerson Antunes de; Santos,Jeovaldo Vieira dos; Faccenda,Odival; Andrade Filho,José Dilermando. |
| Fauna of phlebotomine sand flies (Diptera, Psychodidae) in areas with endemic American cutaneous leishmaniasis in the State of Mato Grosso do Sul, Brazil. The aim of this study was to investigate the ecological aspects of the main vectors of American cutaneous leishmaniasis (ACL) in four monitoring stations situated in the municipalities of Naviraí, Nova Andradina, Novo Horizonte do Sul and Rio Verde de Mato Grosso. For each monitoring station, the captures of sand flies were undertaken each month from July 2008 to June 2010 using CDC and Shannon traps. The CDC traps were installed simultaneously for three consecutive nights in three collection sites: intradomicile, peridomicile and edge of the forest. A Shannon trap was installed from dusk to 10 pm,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Insecta; Neotropical; Phlebotominae; Species diversity. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262013000100016 |
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| Registros recuperados: 115 | |
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