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Registros recuperados: 40
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WATER-BUG (Abedus SP.; BELOSTOMATIDAE) PREDATION ON THE CRITICALLY ENDANGERED Atelopus varius (BUFONIDAE) AT LAS TABLAS PROTECTED ZONE, COSTA RICA Acta biol.Colomb.
GONZÁLEZ-MAYA,José F; GÓMEZ-HOYOS,Diego A; SEISDEDOS-DE-VERGARA,Rocío; CRUZ-LIZANO,Ivan; SCHIPPER,Jan.
ABSTRACT Atelopus varius was believed to be extinct in Costa Rica until the rediscovery of a population within the Las Tablas Protected Zone (LTPZ) in 2008. This rediscovery represented a research and conservation opportunity, including contributing new information about the species' natural history. There are few reported species that prey on A. varius. This report presents a new predation record by a species of water bug (Abedus spp.) on an adult harlequin frog (A. varius). This is only the second confirmed predator for the species. These water bugs have been reported to prey on anurans during reproductive seasons, but in this case, the event occurred on A. varius out of their reproductive season. The effects of water bug predation on the only known...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Extinction; Harlequin frog; Trophic ecology.
Ano: 2019 URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-548X2019000200403
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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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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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Exudate - phenolphthalein pH test for evaluation of validity in seeds of Libidibia ferrea Anais da ABC (AABC)
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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The transition from memory retrieval to extinction Anais da ABC (AABC)
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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The 'whole-animal approach' as a heuristic principle in neuroscience research Biol. Res.
SERANI-MERLO,ALEJANDRO; PAZ,RODRIGO; CASTILLO,ANDRÉS.
Neuroscience embraces a heterogeneous group of disciplines. A conceptual framework that allows a better articulation of these different theoretical and experimental perspectives is needed. A `whole-animal approach' is proposed as a theoretical and hermeneutic tool. To illustrate the potential of this point of view, an overview of the research that has been performed in the extinction of fear-conditioned responses from Pavlov to the present is discussed. This is an example of how a whole-animal-based approach may help to organize and integrate basic and clinical neuroscience research. Our proposal is in agreement with recent statements calling for more integrative approaches in biological and neuropsychiatric research
Tipo: Journal article Palavras-chave: Epistemology; Neurophilosophy; Fear conditioning; Extinction; Reductionism.
Ano: 2005 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602005000400008
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Stimulus specificity in the acquisition and extinction of conditioned taste aversion Biol. Res.
VOGEL,EDGAR H; SOTO,FABIÁN A; CASTRO,MARÍA E; SOLAR,PAOLA A.
An experiment evaluated whether the acquisition and extinction of conditioned taste aversion in the rat is stimulus-specific by testing the degree of response transfer between sweet and salty tastes. Animals in the paired-same and paired-different groups received a presentation of a gustatory CS and a cyclophosphamide injection US. Nonconditioned control groups received unpaired CS /US presentations or the CS followed by a vehicle injection. Taste avoidance was evaluated in three nonreinforced test sessions. In the paired-same, unpaired and vehicle groups, all test sessions were conducted with the same flavor as originally used in training, whereas the paired-different group was tested with a novel flavor on the first and second sessions and with the...
Tipo: Journal article Palavras-chave: Conditioning; Cyclophosphamide; Extinction; Generalization; Stimulus specificity; Taste aversion.
Ano: 2007 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602007000200003
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Sporormiella as a tool for detecting the presence of large herbivores in the Neotropics Biota Neotropica
Raczka,Marco Felipe; Bush,Mark B.; Folcik,Alexandra M.; McMichael,Crystal H..
The reliability of using the abundance of Sporormiella spores as a proxy for the presence and abundance of megaherbivores was tested in southern Brazil. Mud-water interface samples from nine lakes, in which cattle-use was categorized as high, medium, or low, were assayed for Sporormiella representation. The sampling design allowed an analysis of both the influence of the number of animals using the shoreline and the distance of the sampling site from the nearest shoreline. Sporormiella was found to be a reliable proxy for the presence of large livestock. The concentration and abundance of spores declined from the edge of the lake toward the center, with the strongest response being in sites with high livestock use. Consistent with prior studies in...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Extinction; Fossil pollen; Lake sediment; Livestock; Pleistocene Megafauna; Sporormiella spores.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032016000100110
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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
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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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Robustness of plant-flower visitor webs to simulated climate change Ecología austral
Devoto,Mariano; Zimmermann,Martín; Medan,Diego.
Climate change threatens the integrity of pollination webs by decoupling plants and flower visitors both phenologically and ecologically. We simulated a range shift of flower-visitor species along a steep east-west rainfall gradient to explore resulting patterns of extinction. The systems studied seemed to be rather robust to range shifts. This results from (a) the positive correlation between the geographic range and both the local (i.e. at each site) and the regional (i.e. pooling across sites) number of interaction partners of the plants and flower visitors of these webs, and (b) a nested assembly of interactions at the regional level. In a broader context, this study reveals itself as a useful tool for understanding the links between the interaction...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Mutualism disruption; Plant-pollinator interaction; Patagonia; Global change; Extinction; Nestedness.
Ano: 2007 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1667-782X2007000100004
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The Effects of Urban Sprawl on Birds at Multiple Levels of Biological Organization Ecology and Society
Blair, Robert; University of Minnesota; blairrb@umn.edu.
Urban sprawl affects the environment in myriad ways and at multiple levels of biological organization. In this paper I explore the effects of sprawl on native bird communities by comparing the occurrence of birds along gradients of urban land use in southwestern Ohio and northern California and by examining patterns at the individual, species, community, landscape, and continental levels. I do this by assessing the distribution and abundance of all bird species occupying sites of differing land-use intensity in Ohio and California. Additionally, I conducted predation experiments using artificial nests, tracked the nest fate of American Robins and Northern Cardinals, and assessed land cover in these sites. At the individual level, predation on artificial...
Tipo: Peer-Reviewed Reports Palavras-chave: Avian community; California; Cardinalis cardinalis; Extinction; Faunal homogenization; Invasion; Landscape heterogeneity; Nesting success; Ohio; Predation; Turdus migratorius; Urbanization.
Ano: 2004
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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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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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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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Caiman crocodilus (Linnaeus, 1758). Infoteca-e
FARIAS, I. P.; BATAUS, Y. S. L.; RODRIGUES, J.; UHLIG, V. M.; ANDRADE, T. A.; BASSETTI, L. A.; COUTINHO, M. E.; MAGNUSSON, W. E.; VALADÃO, R. M.; CAMPOS, Z..
Caiman crocodilus habita praticamente todos os tipos de ambientes de zonas úmidas de baixa altitude na região Neotropical, sendo a espécie dentre os crocodilianos com maior distribuição na América Latina. No Brasil, ocorre naturalmente na região Norte e em parte das regiões Centro-Oeste e Nordeste, sua extensão de ocorrência estimada para o país é de 5.525.664 km². É uma espécie adaptável a ambientes antropizados, podendo ser encontrada em todos os habitat fluviais e lacustres presentes dentro de sua área de distribuição, ocorrendo em grande número ao longo das bacias Amazônica e Tocantins/Araguaia, especialmente em rios de água branca. Embora C. crocodilus sofra pressão devido ao uso ilegal (caça), destruição e perda de habitat, principalmente em...
Tipo: Parte de livro Palavras-chave: Jacaré; Espécie em Extinção; Preservação da Natureza; Animal Selvagem; Biopreservation; Wild animals; Extinction.
Ano: 2022 URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1148385
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Caiman yacare (Daudin, 1802). Infoteca-e
CAMPOS, Z.; BATAUS, Y. S. L.; RODRIGUES, J.; UHLIG, V. M.; ANDRADE, T. A.; BASSETTI, L. A.; COUTINHO, M. E.; FARIAS, I. P.; MAGNUSSON, W. E.; VALADÃO, R. M..
Caiman yacare é encontrado nas regiões alagadas do nordeste e leste da Bolívia, no Pantanal brasileiro e afluentes do rio Madeira, no Paraguai e no nordeste da Argentina. Sua extensão de ocorrência estimada para o território brasileiro é de 547.865 km². Os levantamentos populacionais confirmam que, no Pantanal brasileiro, Caiman yacare apresenta uma das mais vigorosas populações naturais de crocodilianos no mundo, com densidades superiores a 100 ind/km², distribuídos por toda planície Pantaneira. O tamanho populacional em toda essa região está na ordem de milhões de indivíduos. Aparentemente, esta espécie apresenta maior resiliência às alterações ambientais e à caça do que as demais espécies de crocodilianos brasileiros. Há conectividade com populações dos...
Tipo: Parte de livro Palavras-chave: Jacaré; Espécie em Extinção; Preservação da Natureza; Animal Selvagem; Biopreservation; Wild animals; Extinction.
Ano: 2022 URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1148386
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Caiman latirostris (Daudin, 1802). Infoteca-e
BASSETTI, L. A.; BATAUS, Y. S. L.; RODRIGUES, J.; UHLIG, V. M.; ANDRADE, T. A.; COUTINHO, M. E.; FARIAS, I. P.; MAGNUSSON, W. E.; VALADÃO, R. M.; CAMPOS, Z..
Caiman latirostris apresenta ampla distribuição latitudinal na América do Sul, compreendendo Argentina, Bolívia, Brasil, Paraguai e Uruguai. No território brasileiro, ocorre nas Regiões Hidrográficas do São Francisco, Atlântico Nordeste Oriental, Atlântico Leste, Atlântico Sudeste, Atlântico Sul, Paraná e do Uruguai, com registros do Nordeste ao Sul do país. Essa espécie é encontrada naturalmente nos biomas Cerrado, Caatinga, Mata Atlântica e Pampa, tendo sido introduzida no Pantanal. Sua extensão de ocorrência estimada para o Brasil é de 2.626.662 km², correspondendo a mais de 70% da distribuição global; com densidades variáveis ao longo de sua distribuição. Caiman latirostris ocorre em ambientes lênticos, sendo frequentemente encontrado em lagoas...
Tipo: Parte de livro Palavras-chave: Jacaré; Espécie em Extinção; Preservação da Natureza; Animal Selvagem; Extinction; Wild animals; Biopreservation.
Ano: 2022 URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1148373
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Melanosuchus niger (Spix, 1825). Infoteca-e
COUTINHO, M. E.; BATAUS, Y. S. L.; RODRIGUES, J.; UHLIG, V. M.; ANDRADE, T. A.; BASSETTI, L. A.; FARIAS, I. P.; MAGNUSSON, W. E.; VALADÃO, R. M.; CAMPOS, Z..
Melanosuchus niger corre em sete países da América do Sul, sendo que a maior parte de sua distribuição é em território brasileiro, onde é encontrado nas regiões hidrográficas Amazônica e Tocantins/Araguaia, com ampla distribuição. No Brasil, sua extensão de ocorrência foi estimada em 3.575.374 km². Essa espécie ocupa ampla diversidade de áreas alagáveis, incluindo os grandes rios e suas lagoas marginais, várzeas e igapós, além de savanas sazonais inundáveis. Embora possa ser afetada pela perda de habitat e caça, acredita-se que a espécie não tenha sofrido redução populacional significativa, encontrando-se atualmente estável. Há conectividade com populações dos países vizinhos, à exceção da drenagem da Guiana Francesa, porém não se sabe o quanto influenciam...
Tipo: Parte de livro Palavras-chave: Jacaré; Espécie em Extinção; Preservação da Natureza; Animal Selvagem; Biopreservation; Wild animals; Extinction.
Ano: 2022 URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1148389
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Paleosuchus palpebrosus (Cuvier, 1807). Infoteca-e
CAMPOS, Z.; BATAUS, Y. S. L.; RODRIGUES, J.; UHLIG, V. M.; ANDRADE, T. A.; BASSETTI, L. A.; COUTINHO, M. E.; FARIAS, I. P.; MAGNUSSON, W. E.; VALADÃO, R. M..
Paleosuchus palpebrosus ocorre em dez países da América do Sul, porém, a maior parte de sua distribuição está no Brasil, ocorrendo em quase todos os Estados. Sua extensão de ocorrência estimada para o território brasileiro é de 7.536.119 km². Ocorre naturalmente em baixas densidades, ocupando ambientes de veredas, riachos, cabeceiras de rios e floresta inundada. Embora em algumas localidades a espécie enfrente ameaças da caça, oriunda de conflitos com moradores ribeirinhos, fragmentação, modificação e perda de habitat; causados por diversas atividades humanas, em especial a construção de hidrelétricas; acredita- se que a espécie não tenha sofrido redução populacional significativa a ponto de colocá-la em risco de extinção. No entanto, sua conservação é...
Tipo: Parte de livro Palavras-chave: Jacaré; Espécie em Extinção; Preservação da Natureza; Animal Selvagem; Biopreservation; Wild animals; Extinction.
Ano: 2022 URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1148390
Registros recuperados: 40
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