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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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A riqueza de espécies arbóreas na floresta atlântica de encosta no estado de São Paulo (Brasil) Rev. Bras. Bot.
TABARELLI,MARCELO; MANTOVANI,WALDIR.
Extensa literatura refere-se à floresta atlântica de encosta no estado de São Paulo como possuidora de elevada diversidade florística. Esta afirmação está baseada em dados e conclusões de estudos florísticos e fitossociológicos locais. A maioria destes trabalhos não define com clareza o que considera diversidade, de que grupos estão tratando, a escala de abordagem e, principalmente, quais as florestas usadas para comparação. Neste estudo, são comparados dados sobre riqueza de plantas arbóreas (<FONT FACE="Symbol">³</font> 2,5 cm dap) na floresta atlântica de encosta em São Paulo com os de outras florestas neotropicais. Posteriormente, são discutidas as principais relações conhecidas entre a riqueza de plantas lenhosas nas florestas neotropicais...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Atlantic rain forest; Species richness; Woody plants; Floristic composition.
Ano: 1999 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84041999000200012
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Contribution to a synopsis of marine species richness in the Pertuis Charentais Sea with new insights in soft-bottom macrofauna of the Marennes-Oleron Bay ArchiMer
De Montaudouin, Xavier; Sauriau, Pierre-guy.
The catalogue of soft-bottom macrofauna in the Marennes-Oleron Bay (French Atlantic coast) has been updated from a benthic survey conducted in April-May 1995. 262 stations were selected using a stratified random strategy based on sediment types and bathymetric levels. 231 soft-bottom macrofauna species were identified. A synopsis of all available literature since the first local marine study published in 1710 by Antoine Ferchauld de Reaumur indicated that 60 benthic species were reported in the Marennes-Oleron Bay for the first time. The sampling effort, i.e. more than 1 station per km(2) and size of the sieving square mesh (1 mm), can partially explain these results. Most of the new recorded species were crustaceans (28 species) and polychaete annelids...
Tipo: Text Palavras-chave: Pertuis Charentais; Marennes Oleron Bay; Checklist; Species richness; Macrozoobenthos.
Ano: 2000 URL: https://archimer.ifremer.fr/doc/2000/publication-885.pdf
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Butterfly Species Richness Patterns in Canada: Energy, Heterogeneity, and the Potential Consequences of Climate Change Ecology and Society
Kerr, Jeremy T; University of Oxford; Jeremy.Kerr@CCRS.NRCan.gc.ca.
The distributions of most pollinator species are poorly documented despite their importance in providing ecosystem services. While these and other organisms are threatened by many aspects of the human enterprise, anthropogenic climate change is potentially the most severe threat to pollinator biodiversity. Mounting evidence demonstrates that there have already been biotic responses to the relatively small climate changes that have occurred this century. These include wholesale shifts of relatively well-documented butterfly and bird species in Europe and North America. Although studies of such phenomena are supported by circumstantial evidence, their findings are also consistent with predictions derived from current models of spatial patterns of species...
Tipo: Peer-Reviewed Reports Palavras-chave: Butterflies; Climate change; Habitat heterogeneity; Land cover; Latitudinal gradients; Pollinator; Species richness; Species richness-energy theory.
Ano: 2001
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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
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Analysis of the contribution and efficiency of the Santuario de la Naturaleza Yerba Loca, 33º S in protecting the regional vascular plant flora (Metropolitan and Fifth regions of Chile) RChHN
ARROYO,MARY T. K; MARTICORENA,CLODOMIRO; MATTHEI,OSCAR; MUÑOZ,MÉLICA; PLISCOFF,PATRICIO.
Santuario de la Naturaleza Yerba Loca (SN Yerba Loca), Metropolitan Region (MR), 33º S, Chile is analyzed for its conservation value and efficiency in protecting native vascular plants in a regional context. The reserve's flora of 500 species and subtaxa was evaluated for species richness, endemism, range size and marginally distributed taxa, using species-area analysis, and tendencies in the floras of the MR (1.434 species and subtaxa) and MR-Fifth regions (1,841 species and subtaxa) to set the regional pattern. The reserve (0.7 % of MR land area and 0.3 % MR-Fifth land area) contains 34 % of the MR and 27% of the MR-Fifth floras, and around 16-17 % of the mediterranean-climate area (regions IV-VIII) flora of central Chile. Veech's Relative Richness Index...
Tipo: Journal article Palavras-chave: Conservation efficiency; Endemism; Hotspot; Protected area; Mediterranean flora; Species richness.
Ano: 2002 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2002000400012
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Biodiversity, Urban Areas, and Agriculture: Locating Priority Ecoregions for Conservation Ecology and Society
Ricketts, Taylor; World Wildlife Fund; taylor.ricketts@wwfus.org; Imhoff, Marc; NASA's Goddard Space Flight Center; mimhoff@LTPmail.gsfc.nasa.gov.
Urbanization and agriculture are two of the most important threats to biodiversity worldwide. The intensities of these land-use phenomena, however, as well as levels of biodiversity itself, differ widely among regions. Thus, there is a need to develop a quick but rigorous method of identifying where high levels of human threats and biodiversity coincide. These areas are clear priorities for biodiversity conservation. In this study, we combine distribution data for eight major plant and animal taxa (comprising over 20,000 species) with remotely sensed measures of urban and agricultural land use to assess conservation priorities among 76 terrestrial ecoregions in North America. We combine the species data into overall indices of richness and endemism. We...
Tipo: Peer-Reviewed Reports Palavras-chave: North America; Agriculture; Biodiversity; Conservation; Conservation priorities; Ecoregions; Endemism; Human land use; Species richness; Threats to biodiversity; Urbanization.
Ano: 2003
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Nonparametric richness estimators of hierarchical arthropod taxa in irrigated rice fields International Rice Research Institute
Zhang, W. J.; Feng, Y. J..
p.39-41
Palavras-chave: Arthropod; Biodiversity; Taxa; Species richness; Sampling; Computer software; Irrigated soils.
Ano: 2004 URL: http://hdl.handle.net/123456789/767
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Community composition and species richness of parasitoids infesting Yponomeuta species in the Netherlands Naturalis
Cleary, Daniel F.R..
Parasitoid assemblages infesting Yponomeuta species in the Netherlands were investigated. Parasitoid species richness and community composition were related to host species, habitat, temporal and spatial variation. Both community structure and species richness did not differ among habitats. There was no significant difference in species richness between years (1994 and 1995) but there was a significant difference in community composition. Community composition and species richness both differed among host species, although this latter result was solely due to the host species Y. evonymellus. There was no significant relationship between community similarity and distance. These results indicate that the parasitoids of the moth genus Yponomeuta in the...
Tipo: Article / Letter to the editor Palavras-chave: ANOSIM; Beta diversity; Community composition; Distance; Species richness.
Ano: 2004 URL: http://www.repository.naturalis.nl/record/534398
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Les virus de l'estuaire de la Charente el du bassin de Marennes-Oleron. Dynamiques spatio-temporelles et interactions avec les communautés bactériennes ArchiMer
Auguet, Jean-christophe.
This study is divided in two parts; one aim is to evaluate the in situ spalio-temporal dynamics of viral communities in the Charante estuary in order to define the appropriate seasons to conduct in vitro viral enrichment experiments. These experiments, that constitute the second part of this study, were performed to assess the impact of freshwater viruses carried by the Charante River on the dynamics and composition of coastal bacterial communities. With abundance ranging from 1.4 x 107 to 208 x I07 VLPml-1. viruses are the most abundant component among plankton microorganisms in surface waters of the Charente estuary. Thre temporal dynamics of this component reflects the indirect influence of temperature through the control of bacterial abundance,...
Tipo: Text Palavras-chave: Richesse spécifique; Composition clonale; Enrichissement vital; Infection lyrique; Structure des communautés; MET; PPGE; Dynamique temporelle; Gradient de salinité; Estuaire; Bactérioplancton; Virioplancton; Species richness; Clonal composition; Viral enrichment; Lytic infection; Community structure; Diversity; TEM; PEGE; Temporal dynamic; Gradient; Salinity; Estuary; Bacterioplankton; Virioplankton.
Ano: 2005 URL: http://archimer.ifremer.fr/doc/2005/these-3071.pdf
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Plant diversity and galling arthropod diversity searching for taxonomic patterns in an animal-plant interaction in the Neotropics Boletín de la Sociedad
de Souza Mendonça, Jr.,Milton.
Gall-inducers are a special guild of endophytic herbivores generating distinct structures known as galls. Gallers are species-specific, as the galls they induce: each gall morphotype is unique. The relationship between plants and gallers is close, and some of the hypotheses to explain galling diversity consider plants directly; others do not. Here I review current diversity hypotheses on galls and their hosts, adding ideas on the interpretation of galler host plant data. The example comes from an ongoing standardised inventory of galls and hosts in Rio Grande do Sul (RS) state, southern Brazil. The questions addressed here are whether: a) galls occur consistently on some plant taxa in different areas, b) these taxa are important for vegetation composition,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Gall; Species richness; Plant taxon size hypothesis; Fabaceae; Myrtaceae; Asteraceae.
Ano: 2007 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-23722007000200022
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Spatial pattern in species richness of demersal fish assemblages on the continental shelf of the northern Mediterranean Sea: a multiscale analysis ArchiMer
Gaertner, J; Bertrand, Jacques; Relini, G; Papaconstantinou, C; Mazouni, N; De Sola, L; Durbec, J; Jukic Peladic, S; Souplet, Arnauld.
The species richness pattern of groundfish species in the entire northern Mediterranean Sea was examined at 3 spatial scales: region, large biogeographical zone and basin. We analysed 1914 trawl hauls collected using a single sampling design in the trawlable areas of the continental shelves between the Strait of Gibraltar and the Strait of Dardanelles (from 36.3 to 45.7 degrees N and 5.3 degrees W to 28 E). Spatial pattern in species diversity was assessed using complementary methods (Chao2 estimates of total species richness, mean species richness and beta diversity). No matter which scale was used, the expected longitudinally decreasing trend in species richness, which has been widely described in previous studies, did not appear when comparing estimates...
Tipo: Text Palavras-chave: Lessepsian; Large scale; Mediterranean Sea; Groundfishes; Beta diversity; Species richness.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/publication-3569.pdf
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Low predictive power of mid-domain effect to explain geographic species richness patterns in Palearctic songbirds Naturalis
Aliabadian, M.; Roselaar, C.S.; Sluys, R.; Nijman, V..
In the study of diversity patterns, the Mid-domain effect (MDE), which explains gradients in diversity solely on the basis of geometric constraints, has emerged as a null-model against which other hypotheses can be tested. The effectiveness, measured by its predictive power, of these MDE models appears to depend on the size of the study area and the range-sizes of the taxa considered. Here we test the predictive power of MDE on the species richness patterns of birds and assess its effectiveness for a variety of species range sizes. We digitised distribution maps of 889 species of songbird endemic to the Palearctic, and analysed the emergent biogeographic patterns with WORLDMAP software. MDE had a predictive power of 20% when all songbirds were included....
Tipo: Article / Letter to the editor Palavras-chave: Aves; Passeriformes; Palearctic; Mid-domain effect; Species richness; Geographic range size; 42.83.
Ano: 2007 URL: http://www.repository.naturalis.nl/record/256132
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Diversidad vegetal en el sotobosque de plantaciones comerciales de Eucalyptus urophylla S. T. Blake Colegio de Postgraduados
Oros Nakamura, Dilhery.
La superficie de los bosques naturales en México se ha visto mermada debido a la gran demanda de productos maderables y a la falta de un adecuado manejo. El Gobierno Federal a través de la Comisión Nacional Forestal (CONAFOR) incentivó el establecimiento de plantaciones forestales comerciales tratando de revertir el deterioro y contribuir a satisfacer la demanda nacional de productos maderables. Sin embargo, existe un desconocimiento sobre el efecto positivo o negativo de los monocultivos en elecosistema, particularmente en la biodiversidad. Los objetivos de este trabajo fueron evaluar, analizar y comparar la diversidad vegetal del sotobosque en condiciones de plantación, de vegetación riparia y de pastizal, a través de la composición florística e...
Tipo: Tesis Palavras-chave: Eucalyptus urophylla; Indice de diversidad; Riqueza de especies; Diversidad alfa y beta; Diversity indicators; Species richness; Aalpha and beta diversity.
Ano: 2008 URL: http://hdl.handle.net/10521/1193
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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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Free-living benthic marine invertebrates in Chile RChHN
LEE,MATTHEW R; CASTILLA,JUAN CARLOS; FERNÁNDEZ,MIRIAM; CLARKE,MARCELA; GONZÁLEZ,CATHERINE; HERMOSILLA,CONSUELO; PRADO,LUIS; ROZBACZYLO,NICOLAS; VALDOVINOS,CLAUDIO.
A comprehensive literature review was conducted to determine the species richness of all the possible taxa of free-living benthic marine invertebrates in Chile. In addition, the extent of endemism to the Pacific Islands and deep-sea, the number of non-indigenous species, and the contribution that the Chilean benthic marine invertebrate fauna makes to the world benthic marine invertebrate fauna was examined. A total of 4,553 species were found. The most speciose taxa were the Crustacea, Mollusca and Polychaeta. Species richness data was not available for a number of taxa, despite evidence that these taxa are present in the Chilean benthos. The Chilean marine invertebrate benthic fauna constitutes 2.47 % of the world marine invertebrate benthic fauna. There...
Tipo: Journal article Palavras-chave: Chile; Species richness; Benthos; Free-living invertebrates.
Ano: 2008 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2008000100005
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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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Effects of Roads on Animal Abundance: an Empirical Review and Synthesis Ecology and Society
Fahrig, Lenore; Carleton University, Geomatics and Landscape Ecology Laboratory, Department of Biology; lfahrig@ccs.carleton.ca; Rytwinski, Trina; Carleton University, Geomatics and Landscape Ecology Laboratory, Department of Biology; trytwins@connect.carleton.ca.
We attempted a complete review of the empirical literature on effects of roads and traffic on animal abundance and distribution. We found 79 studies, with results for 131 species and 30 species groups. Overall, the number of documented negative effects of roads on animal abundance outnumbered the number of positive effects by a factor of 5; 114 responses were negative, 22 were positive, and 56 showed no effect. Amphibians and reptiles tended to show negative effects. Birds showed mainly negative or no effects, with a few positive effects for some small birds and for vultures. Small mammals generally showed either positive effects or no effect, mid-sized mammals showed either negative effects or no effect, and large mammals showed predominantly negative...
Tipo: Peer-Reviewed Synthesis Palavras-chave: Environmental impact; Landscape connectivity; Mortality; Population density; Road network; Road density; Road effect zone; Road mitigation; Species distribution; Species richness; Traffic density; Traffic volume.
Ano: 2009
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Range of Variability in Southern Coastal Plain Forests: Its Historical, Contemporary, and Future Role in Sustaining Biodiversity Ecology and Society
Mitchell, Robert J.; Jones Ecological Research Center; Robert.Mitchell@jonesctr.org; Duncan, Sally L.; Oregon State University; Sally.Duncan@oregonstate.edu.
Historical range of variation (HRV) has been used as a conceptual tool to determine appropriate management actions to sustain or restore diversity of ecological systems. This concept has come into question for both biological and social considerations, and the southeastern United States is a good model system to test its utility. Southeastern Coastal Plain upland pine savannas and woodlands and their associated wetlands are among the most diverse communities in temperate North America, having both high levels of species richness and large numbers of endemic flora and fauna. However, this diversity is intimately linked with disturbance regimes. Maintaining frequent fire, varied in season based on changing management objectives through time, is the most...
Tipo: Peer-Reviewed Reports Palavras-chave: Disturbances; Fire regimes; Historical social and future ranges of variability; Legacies; Rareness; Social acceptability; Species richness.
Ano: 2009
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Patterns in species richness and composition of plant families in the Malay Archipelago Naturalis
Welzen, P.C. van; Slik, J.W.F..
Distribution patterns or the recognition of phytogeographical areas is usually based on the presence and absence of species. The taxa on which the analyses are based remain virtually anonymous. Here we want to determine which Malesian plant families (within the sample) are responsible for species richness and composition patterns. The other aim is to determine whether the different islands groups in Southeast Asia can be grouped into separate phytogeographical areas. A Principal Coordinates Analysis (PCO) showed the presence of three phytogeographical areas within Malesia: The Sunda Shelf (Malay Peninsula, Sumatra, Borneo) in the west, the Sahul Shelf (New Guinea) in the east, and all remaining central areas forming Wallacea. The latter can be divided into...
Tipo: Article / Letter to the editor Palavras-chave: Floristic patterns; Malay Archipelago; Malesia; PCO; Plant families; Species richness.
Ano: 2009 URL: http://www.repository.naturalis.nl/record/525639
Registros recuperados: 49
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