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Registros recuperados: 49
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Species richness and origin of the bryophyte flora of the Colombian Andes Naturalis
Gradstein, S.R.; Reenen, G.B.A. van; Griffin, D..
Based on data from the ECOANDES project, a phytogeographical analysis has been made of the bryophyte flora along the wet, foggy western slope (1000-4500 m) and the drier eastern slope (500-4500 m) of the Colombian Central Cordillera at the ‘Parque de los Nevados’. Species richness increases with altitude to the upper montane forest, which holds the largest diversity. Liverworts outnumber mosses in the upper submontane and montane forests on the western slope, but elsewhere, in drier environments, their number is lower and falls to below that of mosses. Furthermore, it appears that at lower altitudes, below 3000 m, wide-ranging tropical species prevail whereas narrowranging tropical species (andean and endemic element) and species of temperate origin are...
Tipo: Article / Letter to the editor Palavras-chave: Phytogeography; Species richness; Altitudinal zonation; Andes; Bryophytes.
Ano: 1988 URL: http://www.repository.naturalis.nl/record/535268
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Species richness, diversity and human activities in an elevation gradient of a high-ecosystem in Lagunas Huascoaltinas, Atacama Region, Chile Ciencia e Investigación Agraria
Sanhueza,Doris; Miranda,Marcelo; Gómez,Miguel; Bonacic,Cristian.
The relationship between species richness, diversity and grazing frequency along an altitudinal gradient (1900-3400 m) of an Andean ecosystem indicates that there is an intense human pressure on vegetation use. To identify the vascular flora and its conservation, 20 sites were sampled in two visits during 2006. We identified 79 taxa, including 62.03% native species, 22.78% adventitious and 8.86% endemic (the remaining 6.33% was identified only at the genus level). Some genera were underrepresented. We also observed latitudinal limits (Alstremeria andina), monotypic genera (Geoffroea, Kurzamra, Phragmites, Tessaria and Salix) and monogeneric families (Buddlejaceae, Ephedraceae, Equisetaceae, Malesherbiaceae, Salicaceae and Oxalidaceae). Moreover, we found...
Tipo: Journal article Palavras-chave: Altitudinal gradients; Species richness; Vegetal diversity; Human pressure; Andean wetlands ecosystems.
Ano: 2009 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202009000300008
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Species Richness in Relation to the Presence of Crop Plants in Families of Higher Plants JARTS
Khoshbakht, Korous; Hammer, Karl.
Crop species richness and percentages of cultivated plants in 75 families comprisingmore than 220000 species were analyzed. Three major groups have been made. The first group is including the “big five” families with 10000 and more species in each. The second group comprises 50 families with more than thousand and up to 10000 species and finally the third group contains families with relatively high numbers of crop species. The percentage of cultivated species is various, from 0.16 to 7.25 in group 1, 0 to 7.24 in group 2 and 2.30 to 32.5 in group 3. The results show that there is a positive correlation (r = + 0.56) between number of crop plants and species diversity of the families.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Ecology Evolution Behaviour and Systematics agrobiodiversity; Species richness; Crop plants; Plant families.
Ano: 2008 URL: http://www.jarts.info/index.php/jarts/article/view/68
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Structure of the understory community in four stretches of Araucaria forest in the state of São Paulo, Brazil. Repositório Alice
POLISEL, R. T.; IVANAUSKAS, N. M.; ASSIS, M. C. de; SHEPHERD, G. J.; YAMAMOTO, K..
Abstract: We analyzed the structure of the understory community in the Atlantic Forest sensu lato, for which phytosociological descriptions of the understory are lacking. We delineated 50 plots of 10 × 20 m each at four sites within an Araucaria forest (a subtype of Atlantic Forest), located in the municipalities of Bananal, Campos do Jordão, Itaberá and Barra do Chapéu, all of which are in the state of São Paulo, Brazil. To sample the resident species of the understory, we randomly selected five 1 × 1 m subplots within each plot, resulting in a total sampling area of 250 m2 at each site. We identified differences among the locations, mostly due to proportional differences in growth forms, in terms of species richness and the importance values within the...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Herb-shrub layer; Species richness; Mixed rain forest; Atlantic forest; Araucária; Floresta; Botãnica; Shrublands; Phytosociology; Species diversity.
Ano: 2014 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1010519
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Survey of Apoidea using pan-traps in a brazil nut tree plantation (Bertholletia excelsa Bonpl., Lecythidaceae) in Tome-Assu, Pará. Repositório Alice
MOURA, T. do S. A. de; MAUES, M. M.; SANTOS, A. C. S. dos; SOUSA, J. T. A. de..
2012
Tipo: Resumo em anais de congresso (ALICE) Palavras-chave: Apoidea; Pan-traps; Species richness; Abundance; Melitoma aff. segmentaria; Castanheira; Tomé-Açu.
Ano: 2012 URL: http://www.alice.cnptia.embrapa.br/handle/doc/951575
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Terrestrial mammals of the Jequitinhonha River basin, Brazil: a transition area between Atlantic Forest and Cerrado Mastozool. neotrop.
Geise,Lena; Pereira,Luciana G; Astúa,Diego; Aguieiras,Marcia; Lessa,Leonardo G; Asfora,Paulo H; Dourado,Francisco; Esberárd,Carlos E. L.
Here we present an extensive survey for non-volant mammals along the margins of the Jequitinhonha River, which represents a contact area between the Cerrado and Atlantic Forest biomes. Our data were ob­tained after 13 trapping expeditions (from 2005 to 2012) on both banks of the river, from its source to its mouth, enriched by data obtained from a literature review and voucher specimens deposited in six mammal collections. All collected specimens were identified through their karyotypes and/or morphology. We obtained data for 75 localities (34 at the rigth margin, 42 at the left margin; 30 in the Cerrado and 45 in the Atlantic Forest). We obtained voucher records for 91 species, ca. 17% of all known Brazilian terrestrial non-volant mam­mals. Our results...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Barriers; Didelphimorphia; Karyotypes; Rodentia; Species richness.
Ano: 2017 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-93832017000100009
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The mushroom coral fauna (Scleractinia: Fungiidae) of Brunei Darussalam (South China Sea) and its relation to the Coral Triangle Naturalis
Hoeksema, B.W.; Lane, D.J.W..
Brunei Darussalam is situated on the northwest coast of Borneo, just outside the westernmost boundary of the area presently recognised as the centre of maximum marine biodiversity, the so-called Coral Triangle. This diversity is particularly quantified with regard to numbers of reef coral species. Most coral reefs of Brunei are offshore, submerged patch reefs, which makes them hard to discern from the water surface. Few coral studies have been carried out here, although recently an extensive reef coral inventory has been published for Brunei. The present study builds on this inventory by presenting a focus on the mushroom coral fauna of Brunei, based on a survey of the family Fungiidae at 17 sites varying in distance offshore. The purpose of this study is...
Tipo: Article / Letter to the editor Palavras-chave: Reef corals; Species richness; Submerged reefs; Borneo; 42.79.
Ano: 2014 URL: http://www.repository.naturalis.nl/record/507002
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Using Short-Term Monitoring Data to Achieve Goals in a Large-Scale Restoration Ecology and Society
Hagen, Dagmar; Norwegian Institute for Nature Research; dagmar.hagen@nina.no; Evju, Marianne; Norwegian Institute for Nature Research; marianne.evju@nina.no.
To evaluate the outcome of restoration projects, an overall goal, reformulated to specific subgoals or targets, must be explicit and translated into scientifically measurable ecological attributes. Monitoring ecological attributes is necessary to assess restoration progress. Data from long-term monitoring are rarely available when restoration interventions are planned and implemented. In this study, we show how short-term monitoring data are incorporated into the planning of the large-scale restoration of a former military training area: the largest restoration project approved in Norway, covering more than 165 km² and intended to enhance nature conservation. A pilot project was initiated in 2002 that removed 1.2 km of roads and tested three...
Tipo: Peer-Reviewed Reports Palavras-chave: Adaptive management; Alpine; Ecological attributes; Restoration success; Restoration target; Species richness; Vegetation cover.
Ano: 2013
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Variation in Native Bee Faunas and its Implications for Detecting Community Changes Ecology and Society
Williams, Neal M; University of Calgary; nwilliam@ucalgary.ca; Minckley, Robert L; University of Utah; minckley@biology.utah.edu; Silveira, Fernando A; Universidade Federal de Minas Gerais; fernando@mono.icb.ufmg.br.
Changes in flower-visiting insect populations or communities that result from human impacts can be documented by measuring spatial or temporal trends, or by comparing abundance or species composition before and after disturbance. The level of naturally occurring variation in populations and communities over space and time will dictate the sampling effort required to detect human-induced changes. We compiled a set of existing surveys of the bee faunas of natural communities from around the world to examine patterns of abundance and richness. We focused on a subset of these studies to illustrate variation in bee communities among different sites and within sites over different spatial and temporal scales. We used examples from our compilation and other...
Tipo: Peer-Reviewed Reports Palavras-chave: Apiformes; Apoidea; Faunal surveys; Flower-visiting insects; Functional groups; Monitoring long-term changes; Sampling protocol; Solitary bees; Species composition; Species richness; Worldwide bee faunas.
Ano: 2001
Registros recuperados: 49
Primeira ... 123 ... Última
 

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