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Impacto de la contaminación atmosférica en ecosistemas forestales suburbanos del Distrito Federal. Colegio de Postgraduados
Franco Islas, Ma. Guadalupe.
Las áreas forestales suburbanas del Distrito Federal han estado sujetas a estrés por contaminantes, ocasionando cambios en la composición y estructura de la vegetación. El objetivo de este estudio fue evaluar el Impacto de la contaminación atmosférica en la diversidad vegetal del área forestal suburbana del Distrito Federal. Se establecieron 62 sitos de 1000 m2 para el estrato arbóreo, dentro de cada uno se ubicaron dos subparcelas de 9 m2 para el estrato arbustivo y 3 subunidades de 1 m2 para el estrato herbáceo. Para la clasificación se utilizó el análisis de agrupamiento (CA) y para la ordenación se utilizó el análisis de correspondencia canónica (CCA), el atributo estructural estimado fue el valor de importancia relativa de las especies, se...
Palavras-chave: Ordenación; Clasificación; Número efectivo de especies; Diversidad β; Árboles de regresión; Bosques templados; Ordination; Classification; Effective species number; Regression trees; Β diversity; Temperate forests; Ciencias Forestales; Doctorado.
Ano: 2014 URL: http://hdl.handle.net/10521/2226
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Spider species composition in the tree-shrub strata of riparian forests and its microhabitats in southern Brazil Rev. Bras. Zool.
Rodrigues,Everton N.L.; Rodrigues,Patrícia E.S.; Mendonça Jr,Milton de S..
ABSTRACT The composition of the spider fauna of riparian forests is insufficiently known. These forests, adjacent to both aquatic and terrestrial environments, are recognised as having important ecosystem functions. We compare the composition of spider assemblages of four riparian forests in different drainage basins, along with their microhabitats (edges and forest interior), in the state of Rio Grande do Sul, southern Brazil. Sampling was carried out in the riparian forests of the following rivers: Piratini, municipality of Arroio Grande; Camaquã, municipality of Cristal; Sinos, municipality of Parobé, and Maquiné, municipality of Maquiné. Two samples per season were collected in two years, by sampling the tree-shrub strata with a beating tray, following...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Spider assemblage; Beating tray; Ordination; Microhabitats; Riparian forest.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702016000300701
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Sponge diversity and community composition in Irish bathyal coral reefs Naturalis
Soest, R.W.M van; Cleary, D.F.R.; Kluijver, M.J. de; Lavaleye, M.S.S.; Maier, C.; Duy, F.C. van.
Sponge diversity and community composition in bathyal cold water coral reefs (CWRs) were examined at 500-900 m depth on the southeastern slopes of Rockall Bank and the northwestern slope of Porcupine Bank, to the west of Ireland in 2004 and 2005 with boxcores. A total of 104 boxcore samples, supplemented with 10 trawl/dredge attempts, were analyzed for the presence and abundance of sponges, using microscopical examination of (sub)samples of collected coral branches, and semi-quantitative macroscopic examination. Approximate minimum size of identified and counted sponge individuals was 1 mm. Literature data were added to the Porcupine Bank results to compensate for a less intensive sampling program in that location. Species richness and abundance were...
Tipo: Article / Letter to the editor Palavras-chave: Coldwater; Multivariate analysis; North Atlantic; Ordination; PCA; Porifera; RDA; 42.72.
Ano: 2007 URL: http://www.repository.naturalis.nl/record/226534
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The Habitat of Astragalus adsurgens PALL. Populations Indigenous to Yunwu Mountain in the Loess Plateau, North-west China OAK
HONGO, Akio; KITA, Fumiji; TAKAHASHI, Hidenori; ZOU, Houyan; CHENG, Jimin; ZHAO, Zhiyi; 本江, 昭夫; 喜多, 富美治; 高橋, 英紀; 鄒, 厚遠; 程, 積民; 趙, 志義.
http://www.obihiro.ac.jp/~library/kenkyu.html
Palavras-chave: Astragalus adsurgens; Loess Plateau; Ordination; Shrub-steppe; Slope directions.
Ano: 1992 URL: http://ir.obihiro.ac.jp/dspace/handle/10322/3134
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