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| Registros recuperados: 271 | |
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| Riitters, Kurt; U.S. Forest Service; kriitters@fs.fed.us; Wickham, James D; U.S. Environmental Protection Agency, National Exposure Research Laboratory; wickham.james@epa.gov; O'Neill, Robert; ; eoneill@attglobal.net; Jones, K. Bruce; U.S. Environmental Protection Agency, National Exposure Research Laboratory; jones.bruce@epa.gov; Smith, Elizabeth; U.S. Environmental Protection Agency, National Exposure Research Laboratory; smith.betsy@epa.gov. |
| We report an analysis of forest fragmentation based on 1-km resolution land-cover maps for the globe. Measurements in analysis windows from 81 km 2 (9 x 9 pixels, “small” scale) to 59,049 km 2 (243 x 243 pixels, “large” scale) were used to characterize the fragmentation around each forested pixel. We identified six categories of fragmentation (interior, perforated, edge, transitional, patch, and undetermined) from the amount of forest and its occurrence as adjacent forest pixels. Interior forest exists only at relatively small scales; at larger scales, forests are dominated by edge and patch conditions. At the smallest scale, there were significant differences in fragmentation among continents; within continents,... |
| Tipo: Peer-Reviewed Reports |
Palavras-chave: Biogeography; Edge effect; Forest fragmentation; Geographic information systems; Global patterns; Land-cover map; Landscape ecology; Modeling; Perforated forest; Remote sensing; Satellite imagery; Spatial pattern. |
| Ano: 2000 |
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| Ramírez Llodra,Eva; Tyler,Paul A; German,Christopher R. |
| The vast majority of the mid-ocean ridge system and of the continental margins around the globe have not yet been explored. A relatively small number of vent and seep sites have been analysed and are the focus of long-term research programmes. However, the exploration of new areas will certainly provide the discovery of new vent and seep sites. Furthermore, the study of these key locations will lead to the description of new species and improve our understanding of the abundance, diversity, and distribution of species from chemosynthetically-driven systems around the world's oceans. It is the aim of ChEss to develop an exploration field phase to discover new deep-water hydrothermal vents and cold seeps at key locations, to describe their fauna, and to... |
| Tipo: Journal article |
Palavras-chave: Biogeography; Hydrothermal vents; Cold seeps; Southern oceans. |
| Ano: 2003 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382003000200006 |
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| De los Ríos-Escalante,Patricio; Morrone,Juan J; Rivera,Reinaldo. |
| Distributional patterns of the South American species of the freshwater amphipod genus Hyalella were analysed using a panbiogeographic approach. Five generalized tracks were found: (1) northern Andes to Lake Titicaca (H. dielaii, H. meinerti, H. dybowskii, H.jelskii, H. lubominsky, and H. pauperocavae; (2) lake Titicaca (H. armata, H. cuprea, H. latinamus, H. lucifugax, H. montforti, H. neveulemairei, H. robusta, H. tiwanaku, H. simplex simplex, and H. solida); (3) central Andes (H. fossamancinii and H. kochi); (4) Pampas (H. bonariensis, H. caeca, H. castroi, H. longispina, H. montenegrinae, H. pampeana, H. pernix, H. pseudoazteca, and H. warmingii); and (5) Subantarctic (H. patagonica H. costera, H. curvispina, H. chiloensis, H. falklandensis, H.... |
| Tipo: Journal article |
Palavras-chave: Chile; Hyalella South America; Biogeography. |
| Ano: 2012 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382012000300008 |
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| Pierrot-Bults,Annelies C.. |
| Biogeography around South America is well documented on the Atlantic side and less well documented on the Pacific side especially south of about 30º S. The South Pacific oceanic areas are the least known of all pelagic areas. The different approaches to determine biogeographic provinces (e.g. the classical one showing mainly latitudinal and watermass distribution patterns based on presence/absence of species; and the biogeochemical approach based on productivity regimes and modelling) are discussed. The latter shows more east-west division. Testing of these concepts will probably reveal more coastal provinces in the Pacific area. The transitional area in the South Pacific is also an interesting area for molecular species research because there are some... |
| Tipo: Journal article |
Palavras-chave: Pelagic biodiversity; Biogeography; South America. |
| Ano: 2003 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382003000200005 |
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| Melo,Aline Grasielle Costa de; Varela,Eduardo Sousa; Beasley,Colin Robert; Schneider,Horacio; Sampaio,Iracilda; Gaffney,Patrick Michael; Reece,Kimberly S.; Tagliaro,Claudia Helena. |
| Oysters (Ostreidae) manifest a high degree of phenotypic plasticity, whereby morphology is of limited value for species identification and taxonomy. By using molecular data, the aim was to genetically characterize the species of Crassostrea occurring along the Brazilian coast, and phylogenetically relate these to other Crassostrea from different parts of the world. Sequencing of the partial cytochrome oxidase c subunit I gene (COI), revealed a total of three species of Crassostrea at 16 locations along the Brazilian coast. C. gasar was found from Curuçá (Pará state) to Santos (São Paulo state), and C. rhizophorae from Fortim (Ceará state) to Florianópolis (Santa Catarina state), although small individuals of the latter species were also found at Ajuruteua... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Genetic identification; Oysters; Biogeography; COI gene; Ostreidae. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572010000300030 |
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| Pereira,Sérgio L.; Wajntal,Anita. |
| Most Neotropical birds, including Pteroglossus aracaris, do not have an adequate fossil record to be used as time constraints in molecular dating. Hence, the evolutionary timeframe of the avian biota can only be inferred using alternative time constraints. We applied a Bayesian relaxed clock approach to propose an alternative interpretation for the historical biogeography of Pteroglossus based on mitochondrial DNA sequences, using different combinations of outgroups and time constraints obtained from outgroup fossils, vicariant barriers and molecular time estimates. The results indicated that outgroup choice has little effect on the Bayesian posterior distribution of divergence times within Pteroglossus , that geological and molecular time constraints... |
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Palavras-chave: Pteroglossus; Ramphastidae; Aves; Molecular time estimates; Biogeography. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572008000500026 |
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| Vicari,Marcelo Ricardo; Noleto,Rafael Bueno; Artoni,Roberto Ferreira; Moreira-Filho,Orlando; Bertollo,Luiz Antonio Carlos. |
| Karyotype data are presented for distinct species of the genus Astyanax from four rivers belonging to three different hydrographic basins of the State of Paraná, Brazil (Verde River - Tibagi basin, Açungui River - Ribeira basin, and Santo Antônio and Jaguariaíva Rivers - Jaguariaíva basin). Three karyotypic forms were identified, here denominated karyotype A (2n = 50 chromosomes, with 8m+18sm+10st+14a, and thirteen 18S rDNA sites); karyotype B (2n = 50 chromosomes, with 8m+18sm+10st+1f4a, and four 18S rDNA sites); and karyotype C (2n = 48 chromosomes, with 10m+16sm+10st+12a, and eight 18S rDNA sites). The pattern of constitutive heterochromatin was similar among the three karyotypic forms, with few differences. The 5S rDNA corresponds to a synapomorphic... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Karyotype evolution; Cytotaxonomy; RDNA sites; Biogeography. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572008000200002 |
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| Muschner,Valéria C.; Zamberlan,Priscilla M.; Bonatto,Sandro L.; Freitas,Loreta B.. |
| As part of a long-term investigation on the evolution of Passiflora L., we investigated the divergence ages of the genus and diversification of its subgenera, relating them with biogeographical and/or historical events, and other characteristics of this taxon. The main aim of the present work was to evaluate the biogeographic distribution of this genus to better understand its evolutionary history. This is the first time that representatives from South American and Old World Passifloraceae genera have been studied as a group comprising a total of 106 widely distributed species, with representative samples of the four suggested subgenera. Seven DNA regions were studied, comprising 7,431 nucleotides from plastidial, mitochondrial and nuclear genomes.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biogeography; Molecular phylogenetics analysis; Passionflowers; Plant evolution; Taxonomic classification. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572012000600019 |
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| Abatzopoulos, Th. J.; Amat, F.; Baxevanis, A. D.; Belmonte, G.; Hontoria, F.; Maniatsi, S.; Moscatello, S.; Mura, G.; Shadrin, N. V.. |
| Artemia urmiana (a species previously considered endemic of Lake Urmia, NW Iran) has been found in Lake Koyashskoe, a hypersaline lake on the Black Sea coast of the Crimean peninsula (Ukraine). Therefore, this is the first record of A. urmiana in Europe which updates its distribution. The species identification was based on an integrated and interdisciplinary approach using discriminant analysis of the morphometric characters, scanning electron microscopy, and molecular profile analysis. The data derived from the above mentioned approaches converge to significant similarity of the population under investigation with A. urmiana. The updated geographic distribution of the species, deriving from the present report, asks for additional contribution of other... |
| Tipo: Journal Contribution |
Palavras-chave: Salt lakes; Scanning electron microscopy; Discriminant analysis; Molecular analysis; Biogeography. |
| Ano: 2009 |
URL: http://repository.ibss.org.ua/dspace/handle/99011/1069 |
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| Santos,Érika; Gomes Jr,Edivaldo; Rocha,Clélia M. C. da; Bartels,Paul J.; Fontoura,Paulo. |
| ABSTRACT Batillipes specimens collected in the Southwestern Atlantic Ocean, on the Brazilian Coast (Campos Basin and Potiguar Basin) with a bifurcated caudal appendage similar to B. dicrocercus Pollock, 1970 were assigned to B. potiguarensis Santos, da Rocha, Gomes Jr & Fontoura, 2017. This species was described as having a roundish caudal protrusion but, as shown in this study, it exhibits intraspecific variability of the morphology of the caudal apparatus. The examination of specimens of B. dicrocercus from the type locality (Massachussetts, U.S.A.) and the analysis of the original description and two subsequent emended descriptions, one from the Gulf of Mexico (U.S.A.) and another from the Mediterranean Sea, used for comparison, revealed important... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Batillipedidae; Biogeography; Meiofauna; Atlantic Ocean; Taxonomy. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212018000100241 |
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| Santos,Cléverson Ranniéri M. dos; D'Incao,Fernando. |
| While all species of the genus Callinectes Stimpson, 1860 have a continuous distribution on the Atlantic coast of the Americas, Callinectes sapidus Rathbun, 1896 is the only one with disjunct distribution. Considering that this species was introduced in Europe and Japan, it has been suggested that the occurrence of C. sapidus on the southern coast of Brazil was due to the transport by ballast water. In the archaeological site Ariano Souza, located in the estuary of the Patos Lagoon (southern Brazil), remains of crustaceans, including claws of approximately two thousand years ago, were found. A preliminary analysis of this material showed Callinectes chelae. Because this archaeological site is located inside the estuary, it has been hypothesized that these... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biogeography; Callinectes; Decapoda; Morphology; Archaeology. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212004000100013 |
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| RIBEIRO, J. F.; SANO, S. M.; MACEDO, J.; SILVA, J. A. da. |
| As variacoes na densidade da cobertura vegetal arborea na regiao dos Cerrados tem recebido diversas denominacoes regionais ou o mesmo nome para fisionomias diferentes. E feita uma descricao dos tipos fisionomicos e sao acrescentadas algumas especies caracteristicas ou abundantes. Uma chave de identificacao e apresentada para diferenciar Mata de Galeria, Mata Mesofitica, Cerrado, Cerrado (Cerrado Denso, Cerrado Tipico, Cerrado Ralo, Parque de Cerrado e Vegetacao Rupestre de Altitude), Campo Sujo, Campo Limpo, Vereda. Os principais parametros utilizados na diferenciacao foram a estrutura da vegetacao (altura, estratificacao, percentagem de cobertura arborea) e as caracteristicas do solo (graus de umidade, profundidade e afloramento de rochas). |
| Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E) |
Palavras-chave: Cerradao; Physiography.; Cerrado; Espécie; Mata Ciliar; Vegetação.; Biogeography; Botany; Brazil; Vegetation.. |
| Ano: 1983 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/548930 |
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| Registros recuperados: 271 | |
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