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| Registros recuperados: 78 | |
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| Melo,Marcelo Roberto Souto de; Ribeiro,Mauro César Lambert de Brito; Lima,Flávio César Thadeo de. |
| ABSTRACT A new species of Characidium is described from the Cerrado biome, in Brasília, Distrito Federal, Central Brazil. The new species can be readily diagnosed by the presence of two or three longitudinal rows of dots along the body sides, absence of bars, by the short pectoral fin, which does not reach the vertical through the dorsal fin origin. Additional useful diagnostic characters are the scaled isthmus, absence of the adipose fin, and the terminal mouth. The new species is only known from the córrego Taquara and its tributaries, a tributary of ribeirão do Gama, upstream from lago Paranoá, in the upper rio Paraná basin. In accordance to the IUCN Red List Categories and Criteria, the new species is categorized as Critically Endangered. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Endangered species; IUCN; Lago Paranoá; Reserva Ecológica do Instituto Brasileiro de Geografia e Estatística; Rio Paraná basin. |
| Ano: 2021 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252021000100201 |
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| 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 |
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| Seyboth,Elisa; Condini,Mario V; Albuquerque,Cristiano Q; Varela Jr,Antônio S; Velasco,Gonzalo; Vieira,João P; Garcia,Alexandre M. |
| The dusky grouper, Mycteroperca marginata, is an important commercial marine fish that is currently considered an endangered species worldwide and listed as overexploited in Brazil. Although its reproductive biology has been studied elsewhere, no information is available for populations in its southernmost distribution limit on the Brazilian coast. The present work investigates age structure, growth and reproduction of individuals inhabiting a pair of rocky jetties, about 4.5 km long each, located in the mouth of Patos Lagoon in the municipality of Rio Grande, in the southwestern Atlantic Ocean. A total of 130 individuals obtained between February 2007 and May 2009 were analyzed, with total length ranging from 260 to 800 mm. The growth coefficient found in... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Endangered species; Epinephelus marginatus; Patos Lagoon; Rocky jetties. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252011000400016 |
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| 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 |
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| Abreu,Letícia Aparecida Ferreira de; Paiva,Renato; Mosqueira,Judith Georgette Alcalde; Reis,Michele Valquíria dos; Araújo,Ana Beatriz Silva; Boas,Eduardo Valério de Barros Vilas. |
| ABSTRACT Campomanesia rufa (O. Berg) Nied. is a native Cerrado species that presents great edible potential. However, it is a species “in danger of extinction” as recommended by the International Union for the Conservation of Nature (IUCN). No technical and scientific information about the species exists, thus demonstrating the importance of its research. The present work aimed at the physical and chemical characterization of immature and mature C. rufa fruits. The fruits showed a change in coloration from green (b * = 25.11, h = 122.43) to yellowish-green (b * = 34.26 , h = 115.73), an increase in mass (6.54 g to 10.88 g), diameter (23.76 mm to 28.03 mm) and soluble solids (8.00 to 10.80%). The fruits presented high levels of total (1246.35 mg 100 g-1)... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cerrado; Myrtaceae; Casaqueira; Endangered species; Vitamin C.. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542020000100239 |
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| 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 |
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| 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 |
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| 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 |
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| 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: https://archimer.ifremer.fr/doc/00454/56539/58245.pdf |
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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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| 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 |
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| 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 |
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| 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 |
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| Registros recuperados: 78 | |
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