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A model for floral color inheritance in Leucaena (Leguminosae) Genet. Mol. Biol.
Simioni,Carine; Schifino-Wittmann,Maria Teresa; Paim,Nilton Rodrigues.
A population of 513 hybrids of Leucaena leucocephala (4x) and L. diversifolia ssp. diversifolia (4x), that is being analyzed for several morphological and agronomical characteristics, aiming at selecting cold tolerant plants, was also analyzed for floral color. A model of additive dominant inheritance (pink color dominant over white color, or presence versus absence of pigment, and the number of dominant alleles present determining the intensity of the pink color) is proposed. The action of two independent locus sets is also suggested, one for the male (with two main structural genes) and another for the female floral organs (one main structural gene). It is suggested that an undetermined number of regulatory genes affect color expression.
Tipo: Info:eu-repo/semantics/article
Ano: 1998 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47571998000300013
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A model for the phenotypic plasticity of North sea herring growth in relation to trophic conditions ArchiMer
Shinn, Yunne-jai; Rochet, Marie-joelle.
An adaptation of the von Bertalanffy growth model is formulated to describe the phenotypic plasticity of fish somatic growth in relation to trophic conditions. The model is developed for the North sea Downs herring (Clupea harengus). II suggests that annual growth variability during 1974-1990 was mainly due to the combined effects of herring abundance and wind-induced turbulence (coincident with the spring stratification of the water column). Springtime turbulences cause reduced and delayed planktonic blooms preceding the annual foraging period of Downs herring. The negative relation observed between herring abundance and growth is hypothesized to be due to intra-specific competition for trophic resources. Incorporated into the calculation of yield per...
Tipo: Text Palavras-chave: Modèle de croissance; Densité-dépendance; Plasticité phénotypique; Clupea harengus; Hareng de mer du Nord; Gestion des pêches; Growth model; Density dependence; Phenotypic plasticity; Fishery management; Clupea harengus; North sea herring.
Ano: 1998 URL: http://archimer.ifremer.fr/doc/00188/29878/28358.pdf
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A MODEL OF ENVIRONMENTAL COMPROMISE BETWEEN REGULATORS AND REGULATED PARTIES AgEcon
Hsu, Shi-Ling.
Environmental regulations implemented by administrative agencies have often been met with fierce political resistance from regulated parties. In some instances, regulated parties have turned to legislative and judicial bodies for relief from environmental regulation. As these political and legal battles have escalated, several forms of compromises have evolved. The U.S. Fish and Wildlife Service, in its administration of the Endangered Species Act, has often utilized the tool of "Habitat Conservation Planning" as a means by which some regulatory relief is granted in exchange for an agreement by the regulated party to undertake mitigation measures to aid endangered or threatened species. As a further inducement for regulated parties to enter into the...
Tipo: Conference Paper or Presentation Palavras-chave: Environmental Economics and Policy.
Ano: 1998 URL: http://purl.umn.edu/20788
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A MODEL OF IMPERFECT COMPETITION USING MARGINAL INPUT AND OUTPUT PRICES: APPLICATION TO THE BEEF PACKING INDUSTRY AgEcon
Muth, Mary K.; Wohlgenant, Michael K..
Based on Diewert's idea that models under competition can be generalized to imperfect competition using marginal prices, we develop a test for imperfect competition in the beef packing industry. Our model is more general and flexible than those depending on empricial estimates of the input supply and output demand elasticities.
Tipo: Conference Paper or Presentation Palavras-chave: Agribusiness; Demand and Price Analysis.
Ano: 1998 URL: http://purl.umn.edu/20853
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A MODEL OF MINIMUM SIZE LIMIT REGULATIONS AgEcon
Homans, Frances R.; Ruliffson, Jane A..
Minimum size limits have become an increasingly popular management tool in recreational fisheries. This popularity stems from the potential of minimum size limits to accomplish the twin goals of limiting overfishing and improving fishing quality through increasing the average size of fish caught. The success of minimum size limits in achieving these objectives depends in a complicated way on both the behavior of anglers and the biological mechanisms that guide the growth of the fish population. This paper examines these relationships and also considers the welfare implications of size regulations.
Tipo: Conference Paper or Presentation Palavras-chave: Resource /Energy Economics and Policy.
Ano: 1998 URL: http://purl.umn.edu/14500
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A MULTIPLE ORGANIC POLLUTANT SIMULATION/OPTIMIZATION MODEL OF INDUSTRIAL AND MUNICIPAL WASTEWATER LOADING TO A RIVERINE ENVIRONMENT AgEcon
Carmichael, Jeffrey J..
A multiple organic pollutant simulation/optimization model is developed to aid policy analysis of least cost approaches to wastewater management. Downstream impacts vary non-linearly with pollution loads due to non-linear constituent interactions. An iterative solution method is necessary. The model is demonstrated using a case study of the Nitra River Basin in Slovakia.
Tipo: Conference Paper or Presentation Palavras-chave: Environmental Economics and Policy; Research Methods/ Statistical Methods.
Ano: 1998 URL: http://purl.umn.edu/20995
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A NATIONAL PERSPECTIVE ON LAND USE POLICY ALTERNATIVES AND CONSEQUENCES AT THE RURAL-URBAN FRINGE AgEcon
Burchell, Robert W.; Shad, Naveed A..
Tipo: Conference Paper or Presentation Palavras-chave: Land Economics/Use.
Ano: 1998 URL: http://purl.umn.edu/17931
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A new analysis of hydrographic data in the Atlantic and its application to an inverse modeling study ArchiMer
Reynaud, Thierry; Le Grand, Pascal; Mercier, Herle; Barnier, Bernard.
Tipo: Text
Ano: 1998 URL: http://archimer.ifremer.fr/doc/00341/45181/44578.pdf
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A new combination in Cadetia (Orchidaceae) Naturalis
Schuiteman, A..
The new combination Cadetia maliliensis (J. J. Sm.) Schuit. is made, based on Dendrobium maliliense J. J. Sm. The genus Cadetia is recorded from Borneo for the first time.
Tipo: Article / Letter to the editor
Ano: 1998 URL: http://www.repository.naturalis.nl/record/525109
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A new Coprinus from Papua New Guinea sporulating in pure culture Naturalis
Uljé, C.B.; Aptroot, A.; Iperen, A. van.
From Papua New Guinea a new Coprinus is described, which forms basidiocarps and basidiospores in pure culture. It was isolated from material collected on two collecting trips to the area, in 1992 and 1995.
Tipo: Article / Letter to the editor
Ano: 1998 URL: http://www.repository.naturalis.nl/record/531830
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A NEW GENERAL CONCEPTUAL APPROACH TO MODELING THE LIVESTOCK SECTOR: AN APPLICATION TO THE JAPANESE SWINE-PORK SECTOR AgEcon
Fabiosa, Jacinto F.; Qi, Xiaoting.
Many livestock sector models have limited coverage of relevant variables, and are somewhat ad hoc in their choice of what should be specified as behavioral equations. This study develops a generic conceptual approach to modeling the livestock sector that provides consistent rules of specification and better coverage of variables. This approach is then applied to the swine-pork sector of Japan. The new approach departs significantly from existing models. The structure clearly differentiates stock and flow variables; only flow variables have behavioral specifications and stock variables are accounting identities; flow variables are expressed in rates rather than levels; logistic functions are used in most flow variables to automatically impose...
Tipo: Conference Paper or Presentation Palavras-chave: Livestock Production/Industries; Research Methods/ Statistical Methods.
Ano: 1998 URL: http://purl.umn.edu/20835
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A New General Conceptual Approach to Modeling the Livestock Sector: An Application to the Japanese Swine-Pork Sector AgEcon
Fabiosa, Jacinto F.; Qi, Xiaoting.
Many livestock sector models have limited coverage of relevant variables, and are somewhat ad hoc in their choice of what should be specified as behavioral equations. This study develops a generic conceptual approach to modeling the livestock sector that provides consistent rules of specification and better coverage of variables. This approach is then applied to the swine-pork sector of Japan. The new approach departs significantly from existing models. The structure clearly differentiates stock and flow variables; only flow variables have behavioral specifications and stock variables are accounting identities; flow variables are expressed in rates rather than levels; logistic functions are used in most flow variables to automatically impose...
Tipo: Working or Discussion Paper Palavras-chave: Livestock Production/Industries.
Ano: 1998 URL: http://purl.umn.edu/18631
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A new karyotype for the genus Cavia from a southern island of Brazil (Rodentia - Caviidae) Genet. Mol. Biol.
Gava,A.; Freitas,T.R.O.; Olimpio,J..
Intraspecific karyotype variation in mammal species is very common and often caused by centromeric fusion of acrocentric chromosomes. We describe here a new karyotype 2n = 62 (FN = 112) for the genus Cavia from the Moleques do Sul Islands, of the southern coast of Brazil. We analyzed two male and four female karyotypes that had twenty-four biarmed pairs and six pairs of acrocentric chromosomes. The sexual pair consisted of a metacentric X-chromosome and a large acrocentric Y. C-bands were found in the centromeric and pericentromeric regions of almost all chromosomes, except for some small biarmed and acrocentric ones. Nucleolus organizer regions appeared in two biarmed chromosomes, and G-banding patterns were also seen.
Tipo: Info:eu-repo/semantics/article
Ano: 1998 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47571998000100013
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A new method to estimate genetic gain in annual crops. Repositório Alice
BRESEGHELLO, F.; MORAIS, O. P. de; RANGEL, P. H. N..
The objective of the presente study was to propose a new, generalized methodology to estimate genetic gain of quantitative traits, grain yield in particular, using series of balanced or unbalanced data originating from networks of multiple location trials.
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Melhoramento genético vegetal; Genética.
Ano: 1998 URL: http://www.alice.cnptia.embrapa.br/handle/doc/205636
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A new method to estimate genetic gain in annual crops Genet. Mol. Biol.
Breseghello,Flávio; Morais,Orlando Peixoto de; Rangel,Paulo Hideo Nakano.
The genetic gain obtained by breeding programs to improve quantitative traits may be estimated by using data from regional trials. A new statistical method for this estimate is proposed and includes four steps: a) joint analysis of regional trial data using a generalized linear model to obtain adjusted genotype means and covariance matrix of these means for the whole studied period; b) calculation of the arithmetic mean of the adjusted genotype means, exclusively for the group of genotypes evaluated each year; c) direct year comparison of the arithmetic means calculated, and d) estimation of mean genetic gain by regression. Using the generalized least squares method, a weighted estimate of mean genetic gain during the period is calculated. This method...
Tipo: Info:eu-repo/semantics/article
Ano: 1998 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47571998000400024
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A new species of Eudendrium (Hydrozoa: Anthomedusae: Eudendriidae) from the Netherlands Naturalis
Marques, A.C.; Migotto, A.E..
Eudendrium vervoorti spec. nov. is described from the coast of Zeeland, the Netherlands. A key to Dutch species of Eudendrium is included.
Tipo: Article / Letter to the editor Palavras-chave: Cnidaria; Hydrozoa; Eudendrium; Taxonomy; The Netherlands; New species.; 42.72.
Ano: 1998 URL: http://www.repository.naturalis.nl/record/317808
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A new species of hesionid worm, Hesiocaeca methanicola sp nov (Polychaeta : Hesionidae), living in ice-like methane hydrates in the deep Gulf of Mexico ArchiMer
Desbruyeres, Daniel; Toulmond, André.
On July 14, 1997, in the Gulf of Mexico, a dense population of polychaete worms dwelling in methane hydrates associated with cold seeps was discovered and sampled at 538 meters depth. The worms belong to the family Hesionidae and represent a new species of the genus Hesiocaeca. They differ from the two previously described species by the shape of the prostomium, the shape of the setae and the presence of anal cirri.
Tipo: Text Palavras-chave: Annelida; Polychaeta; Hesionidae; Deep-sea; Methane hydrates; Gulf of Mexico.
Ano: 1998 URL: https://archimer.ifremer.fr/doc/00447/55811/62261.pdf
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A new species of the genus Tetrapetalum (Annonaceae) from Borneo Naturalis
Momose, Kuniyasu.
A new species is described in Tetrapetalum, a small genus of which two species have been known. Although Van Heusden (1992) stated that Tetrapetalum differs from Cyathostemma only in its dimerous flowers, Tetrapetalum seems to be more closely related with Uvaria than with Cyathostemma, because of spreading petals and unlobed stigmas. A key to the three species of Tetrapetalum is provided here.
Tipo: Article / Letter to the editor Palavras-chave: Annonaceae; Uvaria group.; Tetrapetalum.
Ano: 1998 URL: http://www.repository.naturalis.nl/record/525833
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A new spelaeogriphacean (Crustacea: Peracarida) from the Upper Jurassic of China Naturalis
Yan-bin, Shen; Taylor, Rod S.; Schram, Frederick R..
A new monotypic genus of Spelaeogriphacea is described from the Upper Jurassic of Liaoning Province, north-east China. This new genus and species brings the number of known spelaeogriphacean taxa to four, the others being two recent forms from Brazil and South Africa, and one from the Carboniferous of eastern Canada. The new Chinese form is morphologically (and phylogenetically) very similar to the recent spelaeogriphaceans, suggesting that the body plan seen in the recent Spelaeogriphacea was achieved relatively early in the history of the group. A cladistic analysis of this and several other peracaridan orders indicates that the Spelaeogriphacea may be a paraphyletic group. This suggests that much work remains to be done with respect to the taxonomy and...
Tipo: Article / Letter to the editor Palavras-chave: Crustacea; Peracarida; Spelaeogriphacea; Fossils; Upper Jurrasic north-east China; Cladistic analysis.
Ano: 1998 URL: http://www.repository.naturalis.nl/record/534293
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A new sponge Desmapsamma vervoorti spec. nov. (Poecilosclerida: Desmacididae) from Indonesia Naturalis
Soest, R.W.M. van.
A new poecilosclerid sponge species Desmapsamma vervoorti spec. nov. is described from several Indonesian localities: Ambon, Jedan, Salayar, Komodo, Java, and Irian Jaya. The species was earlier reported from several Indo-Pacific localities as D. anchorata (Carter, 1882), a common Caribbean shallow water species. Comparison with Caribbean specimens makes it clear that Indo-Pacific specimens demonstrate small but consistent differences.
Tipo: Article / Letter to the editor Palavras-chave: Porifera; Indonesia; New species; Desmapsamma.; 42.72.
Ano: 1998 URL: http://www.repository.naturalis.nl/record/317752
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