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Registros recuperados: 38
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A complementary strategy for the conservation of native forest tree species: retrieval and conservation of threatened ecotypes PFB - Pesquisa Florestal Brasileira
Shimizu, Jarbas Yukio.
Deforestation has become rampant in recent years in Brazil and has affected all biomes where manyspecies are threatened to extinction due to destruction natural habitats. Government initiatives to hinder thechain of destruction include two main lines of action: to establish conservation units (parks, reserves andothers); and programs to encourage plantation of native tree species for reclamation of degraded ecosystems, restoration of forests on permanent protection areas (riparian, and steep slope environments), and establishment of “legal reserves” (a mandatory forest reserve on at least 20% of the land area). Conservation units are effectivein conserving natural ecosystems. However, they are of limited value for the conservation of ecotypes, sincetheir...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Inbreeding; Outbreeding; Extinction; Gene conservation Endogamia; Exogamia; Extinção; Conservação; Germoplasma.
Ano: 2010 URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/125
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A Near-extinction Event in Lynx: Do Microsatellite Data Tell the Tale? Ecology and Society
Spong, Goran; Evolutionary Biology Centre, Uppsala University; goran.spong@ebc.uu.se; Hellborg, Linda; Evolutionary Biology Centre, Uppsala University; linda.hellborg@ebc.uu.se.
Fluctuations in population size can have a profound impact on effective population size and the maintenance of genetic variation within a population. A number of tests based on microsatellite data have been developed for the detection of bottleneck events in a population's past. In this paper, we search for signs of a bottleneck in microsatellite data on the Scandinavian lynx (Lynx lynx) population. This population was hunted to the brink of extinction, with fewer than 100 animals (one estimate was as low as 30 individuals) remaining in the late 1920s. Protection allowed recovery of the population, which currently numbers about 2000 adults. Despite this pronounced demographic bottleneck (more than 95% of the population was killed), we could find no...
Tipo: Peer-Reviewed Reports Palavras-chave: Bottleneck; Conservation; Extinction; Genetic testing; Lynx; Microsatellite data; Population history; Scandinavia.
Ano: 2002
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A new and presumably now extinct species of Millepora (Hydrozoa) in the eastern Pacific Naturalis
Weerdt, W.H. de; Glynn, P.W..
A new species of hydrocoral, Millepora boschmai, is described from the Gulf of Chiriqui, Pacific Panamá. This species was first found in the early 1970's, but it has disappeared from this area as a result of the severe 1982-83 El Nino-Southern Oscillation (ENSO) event. Because the species has never been encountered outside the Gulf of Chiriquí, it is assumed that it was endemic to this area and that its disappearance marks an extinction event, representing the first documented case of a modern extinction of a tropical marine organism due to natural causes.
Tipo: Article / Letter to the editor Palavras-chave: Millepora; Hydrozoa; New species; Extinction; East Pacific; 42.72.
Ano: 1991 URL: http://www.repository.naturalis.nl/record/318045
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A revised checklist of Nepticulidae fossils (Lepidoptera) indicates an Early Cretaceous origin Naturalis
Doorenweerd, C.; Nieukerken, E.J. van; Sohn, J.-C.; Labandeira, C.C..
With phylogenetic knowledge of Lepidoptera rapidly increasing, catalysed by increasingly powerful molecular techniques, the demand for fossil calibration points to estimate an evolutionary timeframe for the order is becoming an increasingly pressing issue. The family Nepticulidae is a species rich, basal branch within the phylogeny of the Lepidoptera, characterized by larval leaf-mining habits, and thereby represents a potentially important lineage whose evolutionary history can be established more thoroughly with the potential use of fossil calibration points. Using our experience with extant global Nepticulidae, we discuss a list of characters that may be used to assign fossil leaf mines to Nepticulidae, and suggest useful methods for classifying...
Tipo: Article / Letter to the editor Palavras-chave: Baltic amber; Calibration points; Dakota formation; Evolutionary history; Extinction; Fossil record; Larvae; Leaf mining; Plant hosts; Stigmella; Stigmellites.
Ano: 2015 URL: http://www.repository.naturalis.nl/record/648751
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Ancient feeding, ecology and extinction of Pleistocene horses from the Pampean Region, Argentina Ameghiniana
Sánchez,Begoña; Prado,José Luis; Alberdi,María Teresa.
To reconstruct the diet and habitat preference of fossil horses, we measured the carbon and oxygen isotope composition of 35 bone and tooth samples of Equus (Amerhippus) neogeus Lund, Hippidion principale (Lund), and Hippidion devillei (Gervais) from 10 different Pleistocene localities in the Pampean region (Argentina). To compare the three species by stratigraphic age, we divided the samples into three groups: lower Pleistocene, middle-late Pleistocene and latest Pleistocene. Samples of Hippidion devillei from the lower Pleistocene were more homogeneous, with δ13C values ranging between -11.73 to -9.79‰. These data indicate a diet exclusively dominated by C3 plants. In contrast, Hippidion principale and Equus (Amerhippus) neogeus from...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Equus (Amerhippus); Hippidion; Paleodiet; Ecology; Extinction; Pleistocene; Papean region; South America.
Ano: 2006 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0002-70142006000200012
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Banco Brasileiro de Germoplasma Animal: desafios e perspectivas da conservação de caprinos no Brasil. Repositório Alice
RAMOS, A. F.; ALBUQUERQUE, M. do S. M.; MARIANTE, A. da S..
bitstream/item/183378/1/RB360-Ramos-pag104-107.pdf
Tipo: Nota Técnica/Nota Científica (ALICE) Palavras-chave: Extinção; Conservation; Genetic resource; Conservação; Recurso genético; Reprodução; Semen; Extinction; Reproduction.
Ano: 2011 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/901927
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Blurring the picture: introductions, invasions, extinctions – biogeography in a global world Naturalis
Nijman, V.; Vonk, R..
Global biogeography and phylogeography have gained importance as research topics in zoology, as attested by the steady increase in the number of journals devoted to this topic and the number of papers published. Yet, in a globalising world, with species reintroductions, invasions of alien species, and large-scale extinctions, unravelling the true biogeographic relationships between areas and species may become increasingly difficult. We present an introduction to the symposium ‘Biogeography: explaining and predicting species distributions in space and time’ held in Amsterdam in 2007, and the resulting papers as published in this special issue, including papers on crustaceans, birds and mammals.
Tipo: Article / Letter to the editor Palavras-chave: Extinction; Globalization; Invasions; Reintroductions; Zoogeography; 42.65.
Ano: 2008 URL: http://www.repository.naturalis.nl/record/280455
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CAN DOMESTICATION OF WILDLIFE LEAD TO CONSERVATION? THE ECONOMICS OF TIGER FARMING IN CHINA AgEcon
Abbott, Brant; van Kooten, G. Cornelis.
Tigers are a threatened species that might soon disappear in the wild. Not only are tigers threatened by deteriorating and declining habitat, but poachers continue to kill tigers for traditional medicine, decoration pieces and so on. Although international trade in tiger products has been banned since 1987 and domestic trade within China since 1993, tigers continue to be poached and Chinese entrepreneurs have established tiger farms in anticipation of their demise. While China desires to permit sale of tiger products from captive-bred tigers, this is opposed on the grounds that it likely encourages illegal killing. Instead, wildlife conservationists lobby for more spending on anti-poaching and trade-ban enforcement. In this study, a mathematical...
Tipo: Working or Discussion Paper Palavras-chave: Endangered species; Extinction; Wildlife farming and bioeconomics; Environmental Economics and Policy; Q57; Q27; C61; F13.
Ano: 2009 URL: http://purl.umn.edu/46994
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Comunidade de pequenos mamíferos de paisagens nativas e pastagens cultivadas no Pantanal da Nhecolândia. Repositório Alice
COELHO, A. G. DE A.; ANTUNES, P. C.; OLIVEIRA-SANTOS, L. G. R.; TOMAS, W. M.; BORDIGNON, M. O..
O Pantanal possui uma grande diversidade de habitats, compondo uma paisagem complexa que tem sido conservada pela pecuária tradicional. Mais recentemente, a implantação de pastagem cultivada, visando ao aumento da produtividade e intensificando o sistema de produção vem alterando a paisagem pantaneira. Os resultados dessa alteração é a simplificação da composição e da complexidade da paisagem, colocando em risco a biodiversidade regional. O objetivo deste estudo foi avaliar alterações na comunidade de pequenos mamíferos em diferentes fitofisionomias, inclusive área alterada, em duas Fazendas no Pantanal da Nhecolândia. The Pantanal presents a great habitat diversity composing a complex landscape which has been conserved by the traditional cattle ranching....
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: Bracchiaria; Desmatamento; Extinção; Marsupiais; Pecuária; Roedores; Cattle ranching; Deforestation; Extinction; Marsupials; Rodents.
Ano: 2010 URL: http://www.alice.cnptia.embrapa.br/handle/doc/868294
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Dimorphandra wilsonii Rizzini (Fabaceae): distribution, habitat and conservation status Acta Botanica
Fernandes,Fernando Moreira; Rego,Juliana Ordones.
Dimorphandra wilsonii Rizzini is a rare species. Although cited as endemic to the Brazilian state of Minas Gerais, it has been recorded only for the municipalities of Paraopeba and Caetanópolis and therefore has not been extensively studied. This long-term, intensive survey, conducted from 2004 to 2012 in the central region of the state, was aimed at assessing its distribution, describing its habitat, and verifying its endemism, as well as assessing threats and determining its conservation status. Given the considerable size of the area to be studied and the difficulty of locating individuals of the species, we adopted popular participation as a complementary tool and we employed spatial distribution modeling. Communities were mobilized through the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Extinction; Endemism; Faveiro-de-wilson; Inventory; Popular participation.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062014000300017
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Extinction Risk in Successional Landscapes Subject to Catastrophic Disturbances Ecology and Society
Boughton, David; Pacific Northwest Research Station, U.S. Forest Service; david.boughton@noaa.gov; Malvadkar, Urmila; Princeton University; malvadkr@princeton.edu.
We explore the thesis that stochasticity in successional-disturbance systems can be an agent of species extinction. The analysis uses a simple model of patch dynamics for seral stages in an idealized landscape; each seral stage is assumed to support a specialist biota. The landscape as a whole is characterized by a mean patch birth rate, mean patch size, and mean lifetime for each patch type. Stochasticity takes three forms: (1) patch stochasticity is randomness in the birth times and sizes of individual patches, (2) landscape stochasticity is variation in the annual means of birth rate and size, and (3) turnover mode is whether a patch is eliminated by disturbance or by successional change. Analytical and numerical analyses of the model suggest that...
Tipo: Peer-Reviewed Reports Palavras-chave: Biodiversity; Catastrophe; Dispersal; Disturbance; Extinction; Landscape; Metapopulation; Patch dynamics; Patchy population; Succession.
Ano: 2002
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Flavones from Erythrina falcata are modulators of fear memory. Repositório Alice
OLIVEIRA, D. R. de; ZAMBERLAM, C. R.; GAIARDO, R. B.; REGO, G. M.; CERUTTI, J. M.; CAVALHEIRO, A. J.; CERUTTI, S. M..
Background: Flavonoids, which have been identified in a variety of plants, have been demonstrated to elicit beneficial effects on memory. Some studies have reported that flavonoids derived from Erythrina plants can provide such beneficial effects on memory. The aim of this study was to identify the flavonoids present in the stem bark crude extract of Erythrina falcata (CE) and to perform a bioactivity-guided study on conditioned fear memory. Methods: The secondary metabolites of CE were identified by high performance liquid chromatography combined with a diode array detector, electrospray ionization tandem mass spectrometry (HPLC-DAD-ESI/MSn) and nuclear magnetic resonance (NMR). The buthanolic fraction (BuF) was obtained by partitioning. Subfractions from...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Erythrina falcata; Flavona; Uso terapêutico; Memória; Medo condicionado; Flavone; Acquisition; Extinction; Fear conditioning.
Ano: 2014 URL: http://www.alice.cnptia.embrapa.br/handle/doc/999163
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Fossil evidence and probable extinction of the greater fishing bat Noctilio leporinus (Chiroptera: Noctilionidae) on Isla de Mona, Puerto Rico Mastozool. neotrop.
Olson,Storrs L.; Nieves-Rivera,Ángel M..
The greater fishing bat Noctilio leporinus has long been erroneously attributed to Isla de Mona, Puerto Rico, based on specimens from Monos Island, Trinidad. There are no historical specimens from the island but a radius from a late Holocene cave deposit now establishes that the species was once present. Its apparent extinction may be have been caused by human intervention, a factor that should be taken into account in the biogeography of West Indian bats.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Biogeography; Extinction; Mona Island; Noctilio; West Indies.
Ano: 2010 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-93832010000100020
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Late Cretaceous-Early Palaeogene echinoderms and the K/T boundary in the southeast Netherlands and northeast Belgium — Part 6: Conclusions Naturalis
Jagt, J.W.M..
The palaeobiology of echinoderms occurring in the Meerssen and Geulhem members is discussed and changes in diversity across the K/T boundary are documented. Using literature data on the ecology of extant faunas, the various echinoderm groups are considered. Naturally, such data can only be applied with due caution to fossil forms, whose skeletal morphology is often incompletely known. This holds especially true for asteroids, ophiuroids, and crinoids, which, upon death, rapidly disintegrate into jumbles of dissociated ossicles. Bioturbation, scavenging, and current winnowing all contribute to blurring the picture still further. However, data on extant forms do allow a preliminary subdivision of fossil species into various ecological groups, which are...
Tipo: Article / Letter to the editor Palavras-chave: Echinodermata; Late Cretaceous; Early Palaeogene; Palaeobiology; K/T boundary; Extinction; 42.72; 38.22.
Ano: 2000 URL: http://www.repository.naturalis.nl/record/219135
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Macambira (Bromelia laciniosa Mart.): da utilização a extinção. Repositório Alice
CAVALCANTI, N. de B.; LIMA, J. L. S. de; RESENDE, G. M. de; BRITO, L. T. de L.; ARAUJO, F. P. de.
Objetivou-se com esse trabalho, acompanhar a utilização da macambira pelos agricultores no período de seca para alimentar os animais.
Tipo: Resumo em anais de congresso (ALICE) Palavras-chave: Uso; Extinção; Use; Bromelia Laciniosa; Macambira; Extinction.
Ano: 2000 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/133899
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Noteworthy bird records at Lagoa Santa, southeastern Brazil Zoologia
Rodrigues,Marcos.
Lagoa Santa, a small town in southeastern Brazil where naturalist Peter Lund lived, is regarded nowadays as an important historical site for the biological sciences. From 1847 to 1855, J.T. Reinhardt, hosted by Lund, collected 343 bird species. This material is an outstanding reference for many modern ornithological studies. The present paper reports the occurrence of some rare and threatened birds for the region of Lagoa Santa between 1998 and 2005. In this account I list the Rusty-margined Guan Penelope superciliaris Temminck, 1815; the Roseate Spoonbill Platalea ajaja Linnaeus, 1758; the Maguari Stork Ciconia maguari (Gmelin, 1789); the Wood Stork Mycteria americana Linnaeus, 1758; the Black Hawk-eagle Spizaetus tyrannus (Wied, 1820) and the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Biodiversity; Cerrado; Extinction; Range extension; Threatened species.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752008000100020
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Novelty, Adaptive Capacity, and Resilience Ecology and Society
Allen, Craig R; U.S. Geological Survey, Nebraska Cooperative Fish and Wildlife Research Unit; allencr@unl.edu; Holling, C. S.; Department of Zoology, University of Florida; holling@zoo.ufl.edu.
We present a conceptual framework that explores some of the forces creating innovation and novelty in complex systems. Understanding the sources of variability and novelty may help us better understand complex systems. Understanding complex phenomena such as invasions, migration, and nomadism may provide insight into the structure of ecosystems and other complex systems, and aid our attempts to cope with and mitigate these phenomena, in the case of invasions, and better understand and or predict them. Our model is broadly applicable to ecological theory, including community ecology, resilience, restoration, and policy. Characterizing the link between landscape change and the composition of species communities may help policymakers in their decision-making...
Tipo: Peer-Reviewed Insight Palavras-chave: Adaptation; Cross-scale; Extinction; Innovation; Invasion; Speciation.
Ano: 2010
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On present day islands and past distributions Naturalis
Renema, W..
Southeast Asia, and especially the Philippines-Indonesia-Papua New Guinea Archipelago, harbours the world’s highest marine diversity. This region also had a complex geological history. This raises the question whether these two attributes are related and, if so, how. To locally build high species richness in a region, the balance between speciation/immigration and extinction/exturpation should be positive over at least part of its geologic history.
Tipo: Article / Letter to the editor Palavras-chave: Islands; Geology; Marine diversity; Speciation; Immigration; Extinction; Exturpation; Phillippines; Indonesia; Papua New Guinea; 42.65; 38.22.
Ano: 2011 URL: http://www.repository.naturalis.nl/record/428070
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Orchid cryopreservation Ciência e Agrotecnologia
Vendrame,Wagner; Faria,Ricardo Tadeu de; Sorace,Mauren; Sahyun,Sandra Aparecida.
Orchids are lush and highly valuable plants due to their diversity and the beauty of their flowers, which increases their commercialization. The family Orchidaceae comprises approximately 35,000 species, distributed among more than 1,000 distinct genera and 100,000 hybrids, totaling approximately 8% to 10% of all flowering plants. With the advance of agriculture and the constant destruction of their natural habitat, orchid species are collected in an indiscriminate manner by collectors and vendors, and this extractive activity threatens many species with extinction, drastically reducing their genetic variability in nature. Therefore, it is essential to seek alternatives that make the preservation of such species feasible using techniques with low...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Preservation; Orchidaceae; Ex situ conservation; Freezing tolerance; Extinction.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542014000300001
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Pharmacological effects and behavioral interventions on memory consolidation and reconsolidation BJMBR
Baratti,C.M.; Boccia,M.M.; Blake,M.G..
In this article, we will review some behavioral, pharmacological and neurochemical studies from our laboratory on mice, which might contribute to our understanding of the complex processes of memory consolidation and reconsolidation. We discuss the post-training (memory consolidation) and post-reactivation (memory reconsolidation) effects of icv infusions of hemicholinium, a central inhibitor of acetylcholine synthesis, of intraperitoneal administration of L-NAME, a non-specific inhibitor of nitric oxide synthase, of intrahippocampal injections of an inhibitor of the transcription factor NF-κB, and the exposure of mice to a new learning situation on retention performance of an inhibitory avoidance response. All treatments impair long-term memory...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Memory; Consolidation; Reconsolidation; Extinction; Inhibitory avoidance.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2009000200001
Registros recuperados: 38
Primeira ... 12 ... Última
 

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