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| Registros recuperados: 306 | |
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| Wöhler, O.C.. |
| Growth parameters based on age assignation, length-weight relationship and mortality rates of castañeta Cheilodactylus bergi were studied. Samples came from landings at Mar del Plata Port(Buenos Aires province, Argentina) during 1989, and from a research cruise carried out in the Argentine-Uruguayan Common Fishing Zone(CFZ) during 1991. Castañeta is a longeval demersal species. The growth parameters of von Bertalanffy special model were: 1) Lý 31.95,34.69, 32,30; 2) K 040, 033, 039; and 3) t0 0.00, -0.16, 0.03 corresponding to males, females and all fish respectively. The rates of total mortality (Z) were 0.18, 0.16 and 0.17 for males, females and all fish, respectively. Because of the low rate of exploitation during the study, this values can be used as... |
| Tipo: Journal Contribution |
Palavras-chave: Growth; Mortality; Length-weight relationships. |
| Ano: 1997 |
URL: http://hdl.handle.net/1834/5792 |
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| Hansen, J.E.; Madirolas, A.. |
| Two pelagic surveys to study were carried out during 1993. Those surveys covered the regions inhabited by either the bonaerensis stock in october (34-41°S)and the patagonian stock in November - December (41-45°30'S). Pre-stratified random sampling designs, including two random steps to allocate the transects, were adopted to perform the acoustic sampling by echo integration. A midwater trawl net (9-16 m vertical opening, 10 mm mesh-sized codend)was used to collect fish samples. The biomass of the northern stock was acoustically estimated to be about 1,45 million tons, whereas that of the southern stock was almost 740,000 t. Young anchovies, up to two-year old, allow for most of theose abundance values within each stock. The arrays of individuals at the sea... |
| Tipo: Journal Contribution |
Palavras-chave: Pelagic fisheries; Geographical distribution; Biomass; Mortality; Echo surveys; Stock assessment; Geographical distribution; Biomass; Stock assessment; Pelagic fisheries; Mortality; Http://aims.fao.org/aos/agrovoc/c_5083; Http://aims.fao.org/aos/agrovoc/c_926; Http://aims.fao.org/aos/agrovoc/c_24251; Http://aims.fao.org/aos/agrovoc/c_5659; Http://aims.fao.org/aos/agrovoc/c_4945. |
| Ano: 1996 |
URL: http://hdl.handle.net/1834/1955 |
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| Hansen, J.E.; Madirolas, A.. |
| Information resulting from four spring acoustic surveys carried out between 1993 - 1996 to assess bonaerensis anchovy (Engraulis anchoita) biomass (34°- 41°30´S) is presented. Annual estimates, successively higher, went from 1.5 to 5.3 millon tons and the respective coefficient of variability that followed the same trend ranged between 7.4. and 28.0. . In general terms, the largest abundances were those recorded within the coastal strata off the Río de la Plata followed by those of the most southern stratum. Nevertheless, during the 1996 survey, the latter showed very high biomass values and, consequently, the largest mean. The region corresponding to the main commercial anchovy fishing ground during the season represented, in any case, relatively low... |
| Tipo: Journal Contribution |
Palavras-chave: Echo surveys; Biomass; Sexual maturity; Growth; Mortality; Biomass; Growth; Sexual maturity; Mortality; Http://aims.fao.org/aos/agrovoc/c_926; Http://aims.fao.org/aos/agrovoc/c_3394; Http://aims.fao.org/aos/agrovoc/c_7016; Http://aims.fao.org/aos/agrovoc/c_4945. |
| Ano: 1999 |
URL: http://hdl.handle.net/1834/2531 |
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| Renzi, M.A.; Santos, B.A.; Simonazzi, M.. |
| Hake Merluccius hubbsi population structure in 1993, 1994, 1996, 1997 and 1998 and age and sex distribution during 1997 are analyzed. Data were obtained in research surveys. At the end of winter 1997 concentrations of juveniles were found in the San Jorge Gulf Argentine Sea, SW Atlantic, with maximum yields of 10,000 individuals per trawl hour for age 1 and 2,500 individuals per trawl hour for age 2. The highest concentrations of adults were found in the Gulf and South of 47°S, between the 100 and 200 m isobath, maximum yields of up to 1,700 individuals per trawl hour for age 3 and up to 90 individuals per trawl hour for age 7 and older. In spite of the decrease in population abundance, the basic age structure juveniles, young adults and old adults was... |
| Tipo: Journal Contribution |
Palavras-chave: Sex ratio; Age composition; Mortality; Fishery surveys; Gadoid fisheries; Age composition; Sex ratio; Mortality; Http://aims.fao.org/aos/agrovoc/c_29093; Http://aims.fao.org/aos/agrovoc/c_7014; Http://aims.fao.org/aos/agrovoc/c_4945. |
| Ano: 2003 |
URL: http://hdl.handle.net/1834/2471 |
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| Hansen, J.E.; Cousseau, M.B.; Gru, D.L.. |
| A total of 7263 otoliths were collected from anchovy samples taken during two pelagic cruises which were carried out in the Spring of 1978. An statistical analysis of back calculated length distributions of one-year-old fish (L1)was made. The L1 mean values taken by geographical latitude form a cline, with higher values in the northern samples, and decreasing Southwards. Within this latitudinal gradient two main anchovy populations can be identified, one in the region of Buenos Aires Province and the other in Patagonian waters. The L1 of the females is significatively larger than that of the males for the former population, whereas in the Patagonian area differences between sexes are not significant. The parameters of the von Bertalanffy Growth curves, as... |
| Tipo: Journal Contribution |
Palavras-chave: Stock identification; Otolith reading; Growth curves; Mortality; Mortality; Http://aims.fao.org/aos/agrovoc/c_4945. |
| Ano: 1984 |
URL: http://hdl.handle.net/1834/2043 |
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| Téo, Saulo Jorge; Marcon, Alan; da Costa, Reinaldo Hoinacki. |
| O objetivo desta pesquisa foi avaliar os efeitos da poda da parte aérea sobre a sobrevivência, altura (h), diâmetro de colo (dc) e relação h/dc, de mudas de Pinus taeda L., no Município de Caçador, SC, visando obter mudas de melhor qualidade. Foram testados seis diferentes tipos e intensidades de podas. Os dados foram submetidos ao teste de homogeneidade das variâncias (Teste de Bartlett), à análise de variâncias (ANOVA) e ao teste de comparação de médias de Tukey (α = 5%). Aos 60 dias após a instalação do experimento, não houve mortalidade de mudas. A retirada da porção apical das mudas resultou em formação de brotações laterais, diminuição significativa das alturas e da relação h/dc das mudas, melhorando o padrão de qualidade das mudas. Por outro lado, a... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Recursos Florestais; Engenharia Florestal; Silvicultura; Mudas Florestais Intensidade de poda; Relação h/d; Mortalidade Pruning intensity; H/dn relation; Mortality. |
| Ano: 2014 |
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/468 |
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| Ferraz,José Cláudio Barros; Matos,Cláudia Helena Cysneiros; Oliveira,Carlos Romero Ferreira de; Sá,Maria das Graças Rosa de; Conceição,Antônia Gilciléia Cunha da. |
| Abstract: The objective of this work was to evaluate the toxicity, repellency, efficiency, and phytotoxicity of the aqueous extract of juazeiro (Ziziphus joazeiro) leaves in the control of the red spider mite, Tetranychus ludeni, on cotton plant. For toxicity evaluation, T. ludeni adult females were put on cotton leaf discs sprayed with the juazeiro extract. The repellent effect was verified in arenas that contained cotton leaf discs treated or not with the aqueous extract. The control efficiency of the juazeiro extract was evaluated by the infestation of cotton plants by adult female mites, followed by spraying with the extract. Measured LC50 was 3.54% (m/v), with 76.47% mortality and repellent effect. There was control efficiency for 120 hours, with... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Gossypium hirsutum; Tetranychus ludeni; Ziziphus joazeiro; Mortality; Plant extract; Toxicity.. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2017000700493 |
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| Dargatz, David. |
| As part of the National Animal Health Monitoring System (NAHMS ), USDA:APHIS:Veterinary Services conducted a national study of beef production, the Beef Cow/Calf Health and Productivity Audit (CHAPA). This study was designed to provide both participants and the industry with information on cow/calf health, productivity, and management practices. The National Agricultural Statistics Service (NASS) collaborated with USDA:APHIS:VS to select a producer sample that was statistically designed to provide inferences about the nation's cow/calf population. Data for Part IV: Beef Cow/Calf Breeding Management were collected by federal and state veterinary officers (VMO's) in 18 of the largest cow/calf producing states between July 1 and July 30, 1993. These 18 states... |
| Tipo: Report |
Palavras-chave: NAHMS; Epidemiology; Beef cattle; Calves; Breeding; Mortality; Grazing; Trichomonas fetus; Vaccination; Deworming; Palpation; Livestock Production/Industries. |
| Ano: 1994 |
URL: http://purl.umn.edu/32753 |
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| Bowland, Brad J.; Beghin, John C.. |
| The value-of-statistical-life (VSL) approach is used by environmental economists to value mortality changes resulting from environmental improvement, such as decreased urban air pollution. Because of scarce data, VSL estimates are not available for developing countries. Using robust regression techniques, we conduct a meta-analysis of VSL studies in industrialized countries to derive a VSL prediction function for developing economies accounting for differences in risk, income, human capital levels, and other demographic characteristics of these economies. We apply our estimated VSL to assess the willingness-to-pay for reduction in mortality linked to air pollution in Santiago, Chile. We find willingness-to-pay estimates in the range of $519,000 to $675,000... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Air pollution; Meta-analysis; Mortality; Santiago; VSL; Willingness-to-pay; Environmental Economics and Policy; I12; Q25; O15. |
| Ano: 1998 |
URL: http://purl.umn.edu/18471 |
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| Mather, David; Donovan, Cynthia; Jayne, Thomas S.; Weber, Michael T.; Chapoto, Antony; Mazhangara, Edward; Bailey, Linda; Yoo, Kyeongwon; Yamano, Takashi; Mghenyi, Elliot W.. |
| This paper summarizes and synthesizes across the results of a set of country studies on the effects of prime-age adult mortality on rural households in Kenya, Malawi, Mozambique, Rwanda, and Zambia. Each study is based on large representative rural household surveys. These findings have implications for the design of efforts to mitigate some of the most important effects of rural adult mortality, and for key development policies and priorities. |
| Tipo: Report |
Palavras-chave: HIV/AIDS; Sub-Saharan Africa; Mortality; Community/Rural/Urban Development; Health Economics and Policy; Downloads July 2008 - July 2009: 21; I11. |
| Ano: 2004 |
URL: http://purl.umn.edu/54571 |
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| Registros recuperados: 306 | |
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