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A DYNAMIC MODEL OF THE U.S. ALLIGATOR INDUSTRY: LESSONS FOR SUSTAINABLE USE AND FARM MANAGEMENT AgEcon
Heykoop, Jerry; Frechette, Darren L..
The American alligator has made a remarkable comeback from the brink of extinction. Commercial alligator production is emerging as an important industry in the South. The industry shows similarities to other livestock industries. This paper draws comparisons with other livestock industries to motivate a structural model of the alligator industry.
Tipo: Conference Paper or Presentation Palavras-chave: Alligators; Endangered; Threatened; Wildlife; Sustainable use; Livestock Production/Industries; Resource /Energy Economics and Policy.
Ano: 1999 URL: http://purl.umn.edu/21493
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Didelotia korupensis and Tessmannia korupensis (Leguminosae, Caesalpinioideae), two new tree species from Korup National Park in Cameroon Naturalis
Burgt, X.M. van der.
Two new tree species, Didelotia korupensis and Tessmannia korupensis (Leguminosae, Caesalpinioideae), are described and illustrated. Didelotia korupensis is the 12th species in the genus. It is an understory tree to 15 m tall with an often leaning stem to 30(–53) cm diam. Didelotia korupensis is only known from an area of c. 4 km2 in and near the permanent plots along the P transect in the southern part of Korup National Park in Cameroon, where 51 trees have been recorded so far. Didelotia korupensis is assessed according to IUCN criteria as Endangered. Tessmannia korupensis is the 13th species in the genus. It is a canopy tree to 39 m tall with a stem to 105 cm diam. Tessmannia korupensis is known from seven groups of trees of 9 to 43 trees each, in and...
Tipo: Article / Letter to the editor Palavras-chave: Africa; Detarieae; Endangered; Fabaceae; IUCN; Rain forest; Taxonomy; 42.48.
Ano: 2016 URL: http://www.repository.naturalis.nl/record/606363
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Endangered species management and ecosystem restoration: finding the common ground Ecology and Society
Casazza, Michael L; U.S. Geological Survey; mike_casazza@usgs.gov; Overton, Cory T; U.S. Geological Survey; coverton@usgs.gov; Bui, Thuy-Vy D; U.S. Geological Survey; tbui@usgs.gov; Hull, Joshua M; U.S. Fish and Wildlife Service; University of California, Davis; josh_hull@fws.gov; Albertson, Joy D; U.S. Fish and Wildlife Service; Joy_Albertson@fws.gov; Bloom, Valary K; U.S. Fish and Wildlife Service, Recovery Branch; valary_bloom@fws.gov; Bobzien, Steven; East Bay Regional Park District; sbobzien@ebparks.org; McBroom, Jennifer; Invasive Spartina Project; jtmcbroom@spartina.org; Latta, Marilyn; California State Coastal Conservancy; marilyn.latta@scc.ca.gov; Olofson, Peggy; San Francisco Estuary Invasive Spartina Project; prolofson@spartina.org; Rohmer, Tobias M; Invasive Spartina Project; Olofson Environmental Inc.; toby@spartina.org; Schwarzbach, Steven; U.S. Geological Survey; steven_schwarzbach@usgs.gov; Strong, Donald R; Department of Evolution and Ecology, University of California, Davis; drstrong@ucdavis.edu; Grijalva, Erik; University of California, Davis; ekgrijalva@ucdavis.edu; Wood, Julian K; Point Blue Conservation Science; jwood@pointblue.org; Skalos, Shannon M; U.S. Geological Survey; sskalos@usgs.gov; Takekawa, John; National Audubon Society; jtakekawa@audubon.org.
Management actions to protect endangered species and conserve ecosystem function may not always be in precise alignment. Efforts to recover the California Ridgway’s Rail (Rallus obsoletus obsoletus; hereafter, California rail), a federally and state-listed species, and restoration of tidal marsh ecosystems in the San Francisco Bay estuary provide a prime example of habitat restoration that has conflicted with species conservation. On the brink of extinction from habitat loss and degradation, and non-native predators in the 1990s, California rail populations responded positively to introduction of a non-native plant, Atlantic cordgrass (Spartina alterniflora). California rail populations were in substantial decline when the non-native Spartina...
Tipo: Peer-Reviewed Reports Palavras-chave: Ecosystem; Endangered; Restoration; California Ridgway’ S Rail; Spartina.
Ano: 2016
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Extinct and endangered bird collections: managing the risk Naturalis
Cooper, J.H.; Adams, M.P..
Approaches to managing the collection of extinct and endangered birds at The Natural History Museum, Tring, U.K., are discussed, in particular practices relating to storage, access, loans, and acquisition of new material.
Tipo: Article / Letter to the editor Palavras-chave: Extinct; Endangered; Bird specimens; Collections management; 42.83.
Ano: 2005 URL: http://www.repository.naturalis.nl/record/210812
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In vitro growth of the bromeliad Alcantarea imperialis (Carrière) Harms with different concentrations of nitrogen Biological Sciences
Kurita, Flavia Maria Kazue; Instituto de Botânica; Tamaki, Vivian; Instituto de Botânica.
In various ecosystems, many plants have been reduced in number or even eliminated from natural habitats, including the endangered ornamental romeliadAlcantareaimperialis(Carrière) Harms. Thein vitro cultureisatool thathas beenusedforconservationof endangered species andwidely usedfor the production ofornamental plants. This study aimed at investigating the influence of different nitrogen concentrations on the growth of plantlets of the bromeliad A. imperialis grown in vitro. Seedlings of A. imperialis were cultured on Murashige and Skoog medium, upplemented with different concentrations of nitrogen (0.00, 3.75, 7.50, 15.00, 30.00, 60.00, 90.00, 120.00, and 175.00 mM) at 30 mmol m-2 s-1, at 12 hour photoperiod and 26±2°C for six months. The results showed...
Tipo: Info:eu-repo/semantics/article Palavras-chave: 2.03.00.00-0 e 2.03.03.01-7 bromeliaceae; Conservation; Endangered; Macronutrients; Nutrition; Ornamental Botânica.
Ano: 2014 URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/22933
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Incentive Payment Programs for Environmental Protection: A Framework for Eliciting and Estimating Landowners' Willingness to Participate AgEcon
Layton, David F.; Siikamaki, Juha.
This paper considers the role of incentive payment programs in eliciting, estimating, and predicting landowners' conservation enrollments. Using both program participation and the amount of land enrolled, we develop two econometric approaches for predicting enrollments. The first is a multivariate censored regression model that handles zero enrollments and heterogeneity in the opportunity cost of enrollments by combining an inverse hyperbolic sine transformation of enrollments with alternative-specific correlation and random parameters. The second is a beta-binomial model, which recognizes that in practice elicited enrollments are essentially integer valued. We apply these approaches to Finland, where the protection of private nonindustrial forests is an...
Tipo: Working or Discussion Paper Palavras-chave: Protection; Endangered; Voluntary; Incentive; Tobit; Beta-binomial; Stated preferences; Environmental Economics and Policy.
Ano: 2005 URL: http://purl.umn.edu/10775
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Updated geographic range maps for giraffe, Giraffa spp., throughout sub‐Saharan Africa, and implications of changing distributions for conservation ArchiMer
O'Connor, David; Stacy‐dawes, Jenna; Muneza, Arthur; Fennessy, Julian; Gobush, Kathleen; Chase, Michael J.; Brown, Michael B.; Bracis, Chloe; Elkan, Paul; Zaberirou, Abdoul Razazk Moussa; Rabeil, Thomas; Rubenstein, Dan; Becker, Matthew S.; Phillips, Samantha; Stabach, Jared A.; Leimgruber, Peter; Glikman, Jenny A.; Ruppert, Kirstie; Masiaine, Symon; Mueller, Thomas.
Giraffe populations have declined in abundance by almost 40% over the last three decades, and the geographic ranges of the species (previously believed to be one, now defined as four species) have been significantly reduced or altered. With substantial changes in land uses, loss of habitat, declining abundance, translocations, and data gaps, the existing geographic range maps for giraffe need to be updated. We performed a review of existing giraffe range data, including aerial and ground observations of giraffe, existing geographic range maps, and available literature. The information we collected was discussed with and validated by subject‐matter experts. Our updates may serve to correct inaccuracies or omissions in the baseline map, or may reflect actual...
Tipo: Text Palavras-chave: Aerial survey; Africa; Decline; Endangered; Geographic range; Giraffe; Spatial ecology.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00509/62106/66281.pdf
Registros recuperados: 7
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