Sabiia Seb
PortuguêsEspañolEnglish
Embrapa
        Busca avançada

Botão Atualizar


Botão Atualizar

Ordenar por: RelevânciaAutorTítuloAnoImprime registros no formato resumido
Registros recuperados: 49
Primeira ... 123 ... Última
Imagem não selecionada

Imprime registro no formato completo
A Spatially Explicit Decision Support System for Watershed-Scale Management of Salmon Ecology and Society
Steel, E. Ashley; NW Fisheries Science Center, NOAA Fisheries, 2725 Montlake Blvd East, Seattle, Washington, USA 98112; Ashley.Steel@noaa.gov; Fullerton, Aimee; NW Fisheries Science Center, NOAA Fisheries, 2725 Montlake Blvd East, Seattle, Washington, USA 98112; Aimee.Fullerton@noaa.gov; Caras, Yuko; NW Fisheries Science Center, NOAA Fisheries, 2725 Montlake Blvd East, Seattle, Washington, USA 98112; Yuko.Caras@kingcounty.gov; Sheer, Mindi B.; NW Fisheries Science Center, NOAA Fisheries, 2725 Montlake Blvd East, Seattle, Washington, USA 98112; Mindi.Sheer@noaa.gov; Olson, Patricia; Pacific Watershed Institute, Olympia, Washington, USA 98504; Washington State Department of Ecology, PO Box 47600, Olympia, Washington, USA 98504; pols461@ecy.wa.gov; Jensen, David; NW Fisheries Science Center, NOAA Fisheries, 2725 Montlake Blvd East, Seattle, Washington, USA 98112; David.Jensen@noaa.gov; Burke, Jennifer; NW Fisheries Science Center, NOAA Fisheries, 2725 Montlake Blvd East, Seattle, Washington, USA 98112; School of Ocean and Fisheries Science, University of Washington, Seattle, Washington, USA 98119; burkejen@u.washington.edu; Maher, Michael; NW Fisheries Science Center, NOAA Fisheries, 2725 Montlake Blvd East, Seattle, Washington, USA 98112; Steward and Associates, 120 A, Suite d, Snohomish, Washington, USA 98290; Michael.Maher@noaa.gov; McElhany, Paul; NW Fisheries Science Center, NOAA Fisheries, 2725 Montlake Blvd East, Seattle, Washington, USA 98112; Paul.McElhany@noaa.gov.
Effective management for wide-ranging species must be conducted over vast spatial extents, such as whole watersheds and regions. Managers and decision makers must often consider results of multiple quantitative and qualitative models in developing these large-scale multispecies management strategies. We present a scenario-based decision support system to evaluate watershed-scale management plans for multiple species of Pacific salmon in the Lewis River watershed in southwestern Washington, USA. We identified six aquatic restoration management strategies either described in the literature or in common use for watershed recovery planning. For each of the six strategies, actions were identified and their effect on the landscape was estimated. In this way, we...
Tipo: Peer-Reviewed Reports Palavras-chave: Chinook salmon; Endangered species; Habitat suitability; Recovery planning; Riparian; Sediment routing..
Ano: 2008
Imagem não selecionada

Imprime registro no formato completo
Agricultural Water Security and Instream Flows for Endangered Salmonids in Coastal California's Watersheds AgEcon
Mezzatesta, Mariano; Newburn, David A.; Brozovic, Nicholas.
Many rural landowners within the Western United States do not have access to a secure water supply provided by a major dam or an irrigation district. Such water users must rely instead on groundwater pumping and/or seasonal water flows from tributaries. Some of these agricultural producers choose to store winter stream flows from tributaries within onsite reservoirs to secure their spring/summer water needs. However, regulatory agencies have increased restrictions on surface water storage and diversions to improve instream flows for endangered salmon, thus reducing water security for many landowners not located along the main stem. The majority of salmon habitat is within the tributaries located throughout a watershed. Most research regarding instream...
Tipo: Conference Paper or Presentation Palavras-chave: Instream flow; Salmon; Endangered species; Water; Watershed; Environmental Economics and Policy.
Ano: 2010 URL: http://purl.umn.edu/61485
Imagem não selecionada

Imprime registro no formato completo
Allocating Conservation Resources under the Endangered Species Act AgEcon
Langpap, Christian; Kerkvliet, Joe.
The necessity to develop a priority system to guide the allocation of resources to the conservation of endangered species is widely recognized. The economic theory of biodiversity has established a framework to do so, and has identified priority criteria that should be considered when making conservation decisions. This paper uses a random effects ordered probit model of endangered species recovery to simulate the effects of reallocating conservation funds among species listed under the Endangered Species Act according to these criteria. Our results suggest that if the goal of conservation policy is to preserve a diverse set of species, reallocating conservation funds according to criteria identified by economic theory would yield an improvement over...
Tipo: Conference Paper or Presentation Palavras-chave: Endangered Species Act; Endangered species; Recovery plans; U.S. Fish and Wildlife Service; Biodiversity; Critical habitat; Research and Development/Tech Change/Emerging Technologies.
Ano: 2007 URL: http://purl.umn.edu/9784
Imagem não selecionada

Imprime registro no formato completo
Are Long Fire-free Periods Needed to Maintain the Endangered, Fire-recruiting Shrub Arctostaphylos morroensis(Ericaceae)? Ecology and Society
Odion, Dennis; Marine Science Institute, University of California, Santa Barbara; dennisodion@home.com; Tyler, Claudia; Institute for Computational Earth Systems Science; tyler@lifesci.ucsb.edu.
Morro manazanita (Arctostaphylos morroensis) is a distinctive shrub restricted to a small area along the coast of California, USA. This endangered species faces two opposing fire-related extinction risks: (1) adults are killed by fire, and (2) recruitment opportunities only occur with fire. These strongly limit the capacity of this, as well as other obligate-seeding species, to recover from a population decline, which may result if there is an inadequate amount of time between fires for replenishment of sufficient seed populations. Using a prescribed burn, we tested whether the size of the seed bank that had accumulated in a 40-yr-old stand would prove adequate for maintaining A. morroensis population sizes through fire. Prior to the burn, we found ~11,000...
Tipo: Peer-Reviewed Reports Palavras-chave: Arctostaphylos morroensis; California coast; Endangered species; Fire-dependent germination; Fire-related extinction risk; Maritime chaparral; Morro manzanita; Obligate-seeder; Postfire seedling recruitment; Seed bank; Shrublands; Viable seed.
Ano: 2002
Imagem não selecionada

Imprime registro no formato completo
Assessing East African trade in seahorse species as a basis for conservation under international controls OceanDocs
Vincent, A.C.J.; McPherson, J.M..
1. Seahorses (Hippocampus spp.), many of which are listed as Vulnerable or Endangered on the IUCN Red List, are traded worldwide as souvenirs, aquarium fish and, primarily, for use in traditional medicines. Given concern over the sustainability of this trade, the genus was added to Appendix II of the Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES) in May 2004. 2. This paper reports findings of the first ever survey of seahorse trade in Africa, conducted in Kenya and Tanzania in May and June 2000. 3. Seahorse trade in Kenya was found to be negligible, with approximately 10 live seahorses exported as aquarium fish annually. Until 1998, however, Kenya may have imported somewhere from 1 to 2.3 t of dried seahorses...
Tipo: Journal Contribution Palavras-chave: Hippocampus spp; Bycatch; Non-food fisherie; Seahorse trade; Aquatic animals; Endangered species; Http://aims.fao.org/aos/agrovoc/c_2557.
Ano: 2004 URL: http://hdl.handle.net/1834/816
Imagem não selecionada

Imprime registro no formato completo
Attempts at Applying Cloning to the Conservation of Species in Danger of Extinction International Journal of Morphology
Rojas,Mariana; Venegas,Felipe; Montiel,Enrique; Servely,Jean Luc; Vignon,Xavier; Guillomot,Michel.
The somatic cloning by transfer of the nuclei of differentiated adult cells to previously enucleated oocytes is a promising technique for the production of embryos of high genetic value. The better mastering of somatic cloning gives us the possibility to produce embryos from endangered species. The huemul is an Andean native deer, that has been declared an endangered species, it holds a great patrimonial value and it is a Chilean national emblem. In Chile the huemul has the status of protected animal on thirteen Parks and National Reserves managed by Corporacion Nacional Forestal (CONAF). This protection, however, is considered insufficient due to the few geographical connections between the different protected areas. Furthermore, a great proportion of...
Tipo: Journal article Palavras-chave: Huemul; Interspecific cloning; Endangered species.
Ano: 2005 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022005000400008
Imagem não selecionada

Imprime registro no formato completo
Austrolebias paucisquama (Cyprinodontiformes: Rivulidae), a new species of annual killifish from southern Brazil Neotropical Ichthyology
Ferrer,Juliano; Malabarba,Luiz R.; Costa,Wilson J. E. M..
Austrolebias paucisquama is described from the rio Vacacaí drainage, a tributary to the rio Jacuí, Rio Grande do Sul, Brazil. The new species belongs to the Austrolebias alexandri species-group, by sharing the apomorphic bright blue iridescence and dark gray pectoral fins in males. It is distinguished from other species of this group by having fewer scales around caudal peduncle (12) and fewer dorsal-fin rays in males (17-21). The lack of contact organs on the inner surface of the pectoral fin in males and the color pattern of females - ground color light brownish, sides of body with a variable number of relatively large dark black spots distributed mostly on posterior portion of body - distinguish A. paucisquama from all other species of the genus.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Systematics; Austrolebias alexandri species-group; Endangered species.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252008000200004
Imagem não selecionada

Imprime registro no formato completo
Biological characteristics of sperm in European flat oyster ( Ostrea edulis ) ArchiMer
Suquet, Marc; Pouvreau, Stephane; Queau, Isabelle; Boulais, Myrina; Le Grand, Jacqueline; Ratiskol, Dominique; Cosson, Jacky.
n brooding mollusc species that incubate larvae before their release in seawater, the biology of gametes remains poorly explored. The present study describes some biological characteristics of sperm of the European flat oyster, a native species that has been over-exploited in the past and is nowadays classified as an endangered species in Europe. Flat oysters were collected by divers in the Rade de Brest (Finistère, France), during its natural reproduction period. Gonadal pH is acidic (6.31 ± 0.10). Spermatozoa are clustered in spermatozeugmata, an acellular structure in which the sperm heads are embedded. After their transfer in seawater, spermatozeugmata have a mean diameter of 64 ± 3 μm and they release free spermatozoa for a mean duration of...
Tipo: Text Palavras-chave: Oyster; Ostrea edulis; Brooding species; Sperm; Spermatozeugmata; Endangered species.
Ano: 2018 URL: http://archimer.ifremer.fr/doc/00454/56539/58245.pdf
Imagem não selecionada

Imprime registro no formato completo
Borda Oeste do Pantanal e Maciço do Urucum em Corumbá, MS: área prioritária para conservação da biodiversidade. Repositório Alice
TOMAS, W. M.; ISHII, I. H.; STRUSSMANN, C.; NUNES, A. P.; SALIS, S. M. de; CAMPOS, Z. M. da S.; FERREIRA, V. L.; BORDIGNON, M. O.; BARROS, A. T. M. de; PADILHA, D. R. C..
A região do Maciço do Urucum e adjacências apresenta característica ímpar dentro do Estado do Mato Grosso Sul e do Brasil, em função das influências que recebe de ecossistemas vizinhos, dos endemismos existentes e da ocorrência de espécies de distribuição no Brasil restrita a esta área. A região é uma península com 1.311 km2 de áreas não inundáveis que penetra o Pantanal. Nesta estreita faixa, as atividades de mineração, de indústrias, o crescimento urbano, a expansão de assentamentos rurais e a ampliação de áreas de agropecuária têm potencial para causar impactos profundos na biodiversidade, podendo aumentar o já preocupante estado de fragmentação da vegetação, causando isolamento entre populações, aumentando os riscos de extinção local. Foram levantadas...
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: Espécies ameaçadas; Espécies endêmicas; Espécies raras; Impacto ambiental; Endangered species; Endemic species; Rare species; Environmental impact.
Ano: 2010 URL: http://www.alice.cnptia.embrapa.br/handle/doc/868263
Imagem não selecionada

Imprime registro no formato completo
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
Imagem não selecionada

Imprime registro no formato completo
Commonness and Rarity: Theory and Application of a New Model to Mediterranean Montane Grasslands Ecology and Society
Scheiner, Samuel M; National Science Foundation; sscheine@nsf.gov; Levassor, Catherine; ;.
We examined patterns of commonness and rarity among plant species in montane wet grasslands of Iberia. This examination is set within two contexts. First, we expanded on an earlier scheme for classifying species as common or rare by adding a fourth criterion, the ability of that species to occupy a larger or smaller fraction of its potential suitable habitats, i.e., habitat occupancy. Second, we explicated two theories, the superior organism theory and the generalist/specialist trade-off theory. The data consisted of 232 species distributed among 92 plots. The species were measured for mean local abundance, size of environmental volume occupied, percentage of volume occupied, range within Iberia, and range in Europe and the Mediterranean basin. In general,...
Tipo: Peer-Reviewed Reports Palavras-chave: Commonness; Endangered species; Generalist/specialist trade-off; Geographic range; Habitat occupancy; Habitat specificity; Iberia; Local abundance; Montane grasslands; Rarity; Superior organism theory..
Ano: 1999
Imagem não selecionada

Imprime registro no formato completo
Conflicts over Water in the Upper Klamath Basin and the Potential Role for Market-Based Allocations AgEcon
Jaeger, William K..
The curtailment of irrigation on the Klamath Reclamation Project in 2001 is estimated to have cost farmers more than $35 million. This study examines how alternative water allocations among irrigators in the Upper Klamath Basin could have lowered those costs. Per acre marginal water values vary by a factor of 20 due primarily to variations in soil productivity, with the highest productivity lands concentrated in the federal Project. A linear programming model estimates costs for alternative allocations. Findings indicate that compared to the 2001 allocation, costs could be reduced by 75% with a market-based approach.
Tipo: Journal Article Palavras-chave: Endangered species; Instream flow; Irrigation; Klamath Basin; Linear programming model; Voluntary water transfer; Water market; Water supply reduction; Resource /Energy Economics and Policy.
Ano: 2004 URL: http://purl.umn.edu/31103
Imagem não selecionada

Imprime registro no formato completo
CONSERVATION OF ENDANGERED SPECIES: CAN INCENTIVES WORK FOR PRIVATE LANDOWNERS? AgEcon
Langpap, Christian.
It has been argued that the traditional regulatory approach of the Endangered Species Act, based on land-use restrictions, has failed to protect endangered species on private land. In response, there has been a call for the use of incentives to complement this regulatory approach. This paper examines the potential of incentives programs to elicit conservation-oriented management choices from landowners. Data obtained from a survey of non-industrial private forest owners in Oregon and Washington is used to examine the effectiveness of various incentives. The results indicate that incentives, in particular compensation and assurances, can be effective in increasing the conservation effort provided by landowners. The results also suggest that conservation...
Tipo: Conference Paper or Presentation Palavras-chave: Endangered species; Incentives; Regulation; Endangered Species Act; Conservation; Environmental Economics and Policy; Resource /Energy Economics and Policy; Q220; Q230; Q280; K320.
Ano: 2003 URL: http://purl.umn.edu/21972
Imagem não selecionada

Imprime registro no formato completo
Contribution of Inbreeding to Extinction Risk in Threatened Species Ecology and Society
Brook, Barry W; Northern Territory University; barry.brook@ntu.edu.au; Tonkyn, David W; Clemson University; tdavid@clemson.edu; O'Grady, Julian J; Macquarie University; jogrady@rna.bio.mq.edu.au; Frankham, Richard; Macquarie University; rfrankha@rna.bio.mq.edu.au.
Wild populations face threats both from deterministic factors, e.g., habitat loss, overexploitation, pollution, and introduced species, and from stochastic events of a demographic, genetic, and environmental nature, including catastrophes. Inbreeding reduces reproductive fitness in naturally outbreeding species, but its role in extinctions of wild populations is controversial. To evaluate critically the role of inbreeding in extinction, we conducted realistic population viability analyses of 20 threatened species, with and without inbreeding depression, using initial population sizes of 50, 250, and 1000. Inbreeding markedly decreased median times to extinction by 28.5, 30.5, and 25% for initial populations of 50, 250, and 1000, respectively, and the...
Tipo: Peer-Reviewed Reports Palavras-chave: Endangered species; Inbreeding depression; Life histories; Median time to extinction; Population viability analysis; Purging.
Ano: 2002
Imagem não selecionada

Imprime registro no formato completo
Coupled human and natural systems approach to wildlife research and conservation Ecology and Society
Carter, Neil H; National Socio-Environmental Synthesis Center; ncarter@sesync.org; Hull, Vanessa; Michigan State University; hullvane@msu.edu; McConnell, William J.; Michigan State University; mcconn64@msu.edu; Axinn, William; University of Michigan; baxinn@umich.edu; Ghimire, Dirgha; University of Michigan; nepdjg@umich.edu; Liu, Jianguo; Michigan State University; liuji@msu.edu.
Conserving wildlife while simultaneously meeting the resource needs of a growing human population is a major sustainability challenge. As such, using combined social and environmental perspectives to understand how people and wildlife are interlinked, together with the mechanisms that may weaken or strengthen those linkages, is of utmost importance. However, such integrated information is lacking. To help fill this information gap, we describe an integrated coupled human and natural systems (CHANS) approach for analyzing the patterns, causes, and consequences of changes in wildlife population and habitat, human population and land use, and their interactions. Using this approach, we synthesize research in two sites, Wolong Nature Reserve in China and...
Tipo: Peer-Reviewed Synthesis Palavras-chave: Complex systems; Conservation; Endangered species; Interdisciplinary science; Wildlife science.
Ano: 2014
Imagem não selecionada

Imprime registro no formato completo
De valkruidmineervlinder Digitivalva arnicella in Nederland: herontdekking en behoud (Lepidoptera: Plutellidae: Acrolepiinae) Naturalis
Nieukerken, E.J. van; Koster, J.C..
The occurrence of Digitivalva arnicella in the Netherlands: rediscovery and conservation (Lepidoptera: Plutellidae: Acrolepiinae) Digitivalva arnicella (Heyden, 1863), previously only known from two localities before 1902, has been rediscovered in eight localities in the northern part of the Netherlands (province of Drenthe) on its host Arnica montana. On the basis of leafmines, found in old herbarium collections, it can be concluded that the species was once widespread within the range of its host in the northern and eastern parts of the Netherlands and has apparently been overlooked by entomologists since. D. arnicella is a much endangered species in the Netherlands, because of the dramatic decline of its host. Two of the eight discovered populations...
Tipo: Article / Letter to the editor Palavras-chave: Acrolepiinae; Plutellidae; Yponomeutoidea; Digitivalva; Netherlands; Conservation; Arnica; Digitivalva arnicella ( Plutellidae- ); Habitat management; Endangered status; Effect of food plant shortage; Conservation proposals; Food plants; Arnica montana; Effect on decline to endangered status; Decline-to-endangered-status; Influences-and-conservation; Netherlands; Distribution; Population dynamics and conservation; Endangered species; 42.75.
Ano: 1999 URL: http://www.repository.naturalis.nl/record/209794
Imagem não selecionada

Imprime registro no formato completo
Delay on the Path to the Endangered Species List: Do Costs and Benefits Matter? AgEcon
Ando, Amy Whritenour.
This paper uses duration analysis to evaluate the ability of interest groups to influence the timing of decisions to add species to the endangered species list by exerting pressure on the Fish and Wildlife Service. Using data from 1990 to 1994, it finds that public opposition and support can substantially slow and hasten (respectively) the progress of candidate species through the parts of the listing process most directly under the agency's control. Since the Service is not an atypical agency, similar patterns of public influence on delay may exist in other areas of bureaucratic decision making as well.
Tipo: Working or Discussion Paper Palavras-chave: Duration analysis; Endangered species; Political economy; Interest groups; Environmental Economics and Policy.
Ano: 1999 URL: http://purl.umn.edu/10564
Imagem não selecionada

Imprime registro no formato completo
Demand-Side Factors in Optimal Land Conservation Choice AgEcon
Ando, Amy Whritenour; Shah, Payal.
The dominant paradigm of conservation-reserve planning in economics is to optimize the provision of physical conservation benefits (measured in units like species protected) given a budget constraint. Large-scale biology-based priority setting implies that the value we place on biodiversity and ecosystem function is not affected by human proximity to that natural capital. There is significant evidence, however, that human willingness to pay (WTP) for conservation declines with distance (e.g. Loomis 2000) – a phenomenon we refer to as “spatial value decay”. This paper begins a new strand of the conservation planning literature that takes demand-side factors – the location of people in the landscape and the degree to which their willingness to pay for an...
Tipo: Conference Paper or Presentation Palavras-chave: Conservation; Endangered species; Optimal reserve-site selection; Spatial; Demand-side; Environmental Economics and Policy; Resource /Energy Economics and Policy; Q24; Q57.
Ano: 2009 URL: http://purl.umn.edu/49209
Imagem não selecionada

Imprime registro no formato completo
Do Interest Groups Compete? AgEcon
Ando, Amy Whritenour.
This paper conducts a test of the hypothesis that interest groups compete strategically for influence with a policy-making agency. It adapts econometric methodology from the empirical industrial organization literature that was designed to work with discrete game-theoretic models, and uses data on whether or not supporting and opposing interest groups submitted comments to the Fish and Wildlife Service about each of 173 proposals to add new species to the endangered species list. The results imply that groups do respond to variations in the expected costs and benefits of a listing when deciding whether to pressure the agency. There is no support, however, for the hypothesis that the levels of pressure exerted by the groups emerge from the Nash equilibrium...
Tipo: Working or Discussion Paper Palavras-chave: Interest groups; Strategic competition; Empirical game theory; Endangered species; Institutional and Behavioral Economics; C25; C72; D72; Q28.
Ano: 1998 URL: http://purl.umn.edu/10732
Imagem não selecionada

Imprime registro no formato completo
Economies of Scope in Endangered-Species Protection: Evidence from Interest-Group Behavior AgEcon
Ando, Amy Whritenour.
This paper looks for positive spillovers from the legal protection of one species to the welfare of others, and for evidence of economies of scope in the costs associated with protecting species under the Endangered Species Act. The analyses use data on the intensity of interest-group comment activity in response to proposals to protect new species. The results suggest that these phenomena are significant, strengthening arguments that wildlife-protection policy should be shifted towards species groups or ecosystems. However, the findings are also consistent with diminishing public willingness-to-pay for protected species in a given area, a pattern which also has public-policy implications.
Tipo: Working or Discussion Paper Palavras-chave: Economies of scope; Endangered species; Political economy; Interest groups; Environmental Economics and Policy.
Ano: 1999 URL: http://purl.umn.edu/10903
Registros recuperados: 49
Primeira ... 123 ... Última
 

Empresa Brasileira de Pesquisa Agropecuária - Embrapa
Todos os direitos reservados, conforme Lei n° 9.610
Política de Privacidade
Área restrita

Embrapa
Parque Estação Biológica - PqEB s/n°
Brasília, DF - Brasil - CEP 70770-901
Fone: (61) 3448-4433 - Fax: (61) 3448-4890 / 3448-4891 SAC: https://www.embrapa.br/fale-conosco

Valid HTML 4.01 Transitional