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| Registros recuperados: 40 | |
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| 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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| Nijman, V.; Meijaard, E.. |
| Given its complex zoogeography and large number of islands insular Southeast Asia makes an excellent subject for studying the interrelationships of species richness, island area and isolation. The islands are merely highpoints of an immense shallow continental shelf which during Pleistocene glacial periods was exposed periodically as dry land connecting the now isolated islands with one another. The area is home to a large number of primate taxa, including many endemic to the region (Nasalis, Presbytis, Pongo, Symphalangus, Simias, Tarsius). Worldwide, the number of described (extant) species of primates has doubled in the last two decades partially as a result of applying a different species concept (viz. Phylogenetic Species Concept PSC as opposed to the... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Endemism; Extinction; Island biogeography; Phylogeny; Species concepts; Sunda Shelf; 42.84. |
| Ano: 2008 |
URL: http://www.repository.naturalis.nl/record/280480 |
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| Tsur, Yacov; Zemel, Amos. |
| We study the management of a natural resource that supports ecosystems as well as human needs. The reduction in the resource base poses a threat of occurrence of catastrophic ecological events, such as the sudden collapse of the natural habitat, that lead to severe loss of biodiversity. The event occurrence conditions involve uncertainty of various types, and the distinction among these types affects the optimal exploitation policies. When uncertainty is due to our ignorance of some aspects of the underlying ecology, the isolated equilibrium states characterizing optimal exploitation for many renewable resource problems become equilibrium intervals, giving rise to hysteresis phenomena. Events triggered by genuinely stochastic environmental conditions... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Ecosystem; Resource management; Event uncertainty; Biodiversity; Extinction; Resource /Energy Economics and Policy. |
| Ano: 2004 |
URL: http://purl.umn.edu/14996 |
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| 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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| Tsur, Yacov; Zemel, Amos. |
| We study the management of a natural resource that supports ecosystems as well as human needs. The reduction in the resource base introduces a threat of occurrence of catastrophic ecological events, such as the sudden collapse of the national habitat that lead to severe loss of biodiversity. The event occurrence conditions involve uncertainty of various types, and the distinction among these types affects the optimal exploitation policies. When uncertainty is due to our ignorance of some aspects of the underlying ecology, the isolated equilibrium states characterizing optimal exploitation for many renewable resource problems become equilibrium intervals. Events triggered by genuinely stochastic environmental conditions maintain the structure of... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Ecosystem; Resource management; Event uncertainty; Biodiversity; Extinction; Resource /Energy Economics and Policy. |
| Ano: 2005 |
URL: http://purl.umn.edu/14981 |
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| Srbek-Araujo,Ana Carolina; Scoss,Leandro M.; Hirsch,André; Chiarello,Adriano G.. |
| We report 20 records of Priodontes maximus (Kerr, 1792) collected between 1990 and 2009 in three nature reserves located in forested areas of southeastern Brazil within the Atlantic Forest biome. Seventeen records were collected in Parque Estadual do Rio Doce (PERD), state of Minas Gerais, two in Reserva Biológica de Sooretama and one in Reserva Natural Vale, both located in the state of Espírito Santo. The records were burrows (n = 11), photographs from camera-traps (n = 6), sightings (n = 2) and carcass (n = 1). Given the higher number of records, the PERD seems to maintain the largest population among the three study areas. We searched the literature and found no other recent evidence of the species' presence in the Atlantic forest of Brazil. There are... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Endangered species; Extinction; Forest fragmentation; Xenarthra. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702009000300010 |
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| Diniz,Milena F.; Brito,Daniel. |
| Urbanization poses a serious threat to wildlife populations inhabiting native vegetation remnants surrounded by the expanding urban and suburban sprawl. The close contact with human activities causes not only direct impacts, such as habitat loss, but also indirect negative effects, such as population isolation, roadkills and anthropogenic fires. The Parque Nacional de Brasília is a large Cerrado remnant almost completely surrounded by the city of Brasília, in central Brazil. Here, we use population viability analysis to model the impacts of urbanization on a population of Myrmecophaga tridactyla (Linnaeus, 1758) inhabiting that park. Our results show that roadkill mortality is by far the most serious threat to the long-term persistence of the giant... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Extinction; Inbreeding; PVA; Roadkill; Wildfire. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702013000200005 |
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| 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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| Marco,Cláudia Araújo; da Silva,Toshik Iarley; dos Santos,Tainá Macédo; dos Santos,Hernandes Rufino; Freitas Júnior,Silvério de Paiva; Leite Chaves,Josyelem Tiburtino; dos Santos,Maria Denise Rodrigues. |
| Abstract In the Araripe Plateau (Ceará, Brasil), there is an intense anthropic activity that results in the degradation and risk of extinction of native medicinal species such as Vanillosmopsis arborea Baker (commonly named as Candeeiro). The aim of this research was to assess the main propagation methods of this species and to evaluate the survival of the seedlings in different environments. Two experiments were installed in the headquarters house of IBAMA situated in the Araripe National Forest (FLONA), Crato, State of Ceará, Brazil. The potential of seedling production and stem and root cuttings were evaluated, as well as seedlings adaptation to both environments (experimental area and natural habitat). For seedlings production, the experimental design... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Asteraceae; Candeeiro; Extinction; Propagation; Vanillosmopsis arborea Baker. |
| Ano: 2019 |
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-28122019000100022 |
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| 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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| 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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| Cammarota,Martín; Barros,Daniela M.; Vianna,Mónica R.M.; Bevilaqua,Lia R.M.; Coitinho,Adriana; Szapiro,Germán; Izquierdo,Luciana A.; Medina,Jorge H.; Izquierdo,Iván. |
| Memory is measured by measuring retrieval. Retrieval is often triggered by the conditioned stimulus (CS); however, as known since Pavlov, presentation of the CS alone generates extinction. One-trial avoidance (IA) is a much used conditioned fear paradigm in which the CS is the safe part of a training apparatus, the unconditioned stimulus (US) is a footshock and the conditioned response is to stay in the safe area. In IA, retrieval is measured without the US, as latency to step-down from the safe area (i.e., a platform). Extinction is installed at the moment of the first unreinforced test session, as clearly shown by the fact that many drugs, including PKA, ERK and protein synthesis inhibitors as well as NMDA receptor antagonists, hinder extinction when... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Memory; Retrieval; Extinction; Reconsolidation; Inhibitory avoidance. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652004000300011 |
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| SOUTO,PRISCILA C.; GONÇALVES,EDILMA P.; VIANA,JEANDSON S.; SILVA,JÚLIO C.A.; FERREIRA,DÉBORA T.R.G.; RALPH,LIDIANA N.. |
| Abstract: Seed companies are looking for promising, quick and effective alternatives to determine the physiological quality of seeds. The objective of the current work was to study the efficiency of the exudate - phenolphthalein pH test to evaluate the seeds of two lots of Libidibia ferrea (Mart. ex Tul.) L. P. Queiroz var. ferrea. The statistical design for the the exudate - phenolphthalein pH test was completely randomized with four replicates of 50 seeds in a factorial design (2 x 5), two seed lots and five soaking periods (30, 60, 90, 120, and 150 minutes), respectively, using two constant temperatures (25 and 30°C). The percentage of viability and germination of the seeds did not differ in the temperatures of 25 and 30°C and in the soaking periods by... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Extinction; Staining; Periods of imbibition; Quick tests. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000700851 |
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| 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 |
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| 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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| Registros recuperados: 40 | |
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