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Search Results: 1 - 10 of 867 matches for " Irma Northland-Leppe "
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Chromosomes of Girella laevifrons (Tschudi 1846) (Osteichthyes: Kyphosidae)
Northland-Leppe,Irma; Véjar,Drina; Jara-Seguel,Pedro; Fuentes,Nelson; Nú?ez,Cristian;
Gayana (Concepción) , 2010, DOI: 10.4067/S0717-65382010000200007
Abstract: the chromosome number and karyotype morphology of girella laevifrons (tschudi 1846) are described for the first time. g. laevifrons presents a chromosome number of 2n = 48 and its karyotype is formed in both sexes by 24 acrocentric chromosome pairs, similar to what has been described for other species of girella gray, 1835.
CHROMOSOMES AND Ag-NOR LOCATION IN FLUVIATE POPULATIONS OF SALMO TRUTTA FARIO L. 1758 (SALMONIFORMES: SALMONIDAE) FROM ATACAMA DESERT, CHILE
Northland-Leppe,Irma; Lam,Natalia; Jara-Seguel,Pedro; Capetillo-Arcos,Juana;
Gayana (Concepción) , 2009, DOI: 10.4067/S0717-65382009000100007
Abstract: salmo trutta fario l. 1758, presented a chromosome number 2n = 80 and a fundamental number nf = 100. thehaploid chromosome set consists of seven metacentric chromosomes, three submetacentric, one subtelocentric and 29 telocentrics. the ag-nor are located at conserved position in the short arm of pair 11 (st), with the presence of additional nor on the short arm of pair 9 (sm) which is rare in others taxa previously studied.
CHROMOSOMES OF THE LIMPET FISSURELLA LIMBATA (SOWERBY, 1835) FROM NORTHERN CHILE (ARCHAEOGASTROPODA: FISSURELLIDAE)
Pinochet-Roco,José; Northland-Leppe,Irma; Capetillo-Arcos,Juana; Jara-Seguel,Pedro;
Gayana (Concepción) , 2008, DOI: 10.4067/S0717-65382008000200015
Abstract: fissurella limbata (sowerby, 1835), presenta un número cromosómico diploide 2n = 32 similar al descrito previamente para otras especies del género fissurella reeve 1849. el juego cromosómico haploide def limbata tiene siete cromosomas metacéntricos, seis submetacéntricos y tres subtelocéntricos. los cromosomas son peque?os y no exceden de 4,0 mm en longitud.
CHROMOSOMES OF THE LIMPET FISSURELLA LIMBATA (SOWERBY, 1835) FROM NORTHERN CHILE (ARCHAEOGASTROPODA: FISSURELLIDAE) CROMOSOMAS DE LA LAPA FISSURELLA LIMBATA (SOWERBY, 1835) DEL NORTE DE CHILE (ARCHAEOGASTROPODA: FISSURELLIDAE)
José Pinochet-Roco,Irma Northland-Leppe,Juana Capetillo-Arcos,Pedro Jara-Seguel
Gayana (Concepción) , 2008,
Abstract: Fissurella limbata (Sowerby, 1835), presenta un número cromosómico diploide 2n = 32 similar al descrito previamente para otras especies del género Fissurella Reeve 1849. El juego cromosómico haploide deF limbata tiene siete cromosomas metacéntricos, seis submetacéntricos y tres subtelocéntricos. Los cromosomas son peque os y no exceden de 4,0 mm en longitud.
Chromosomes of Girella laevifrons (Tschudi 1846) (Osteichthyes: Kyphosidae) Cromosomas de Girella laevifrons (Tschudi 1846) (Osteichthyes: Kyphosidae)
Irma Northland-Leppe,Drina Véjar,Pedro Jara-Seguel,Nelson Fuentes
Gayana (Concepción) , 2010,
Abstract: The chromosome number and karyotype morphology of Girella laevifrons (Tschudi 1846) are described for the first time. G. laevifrons presents a chromosome number of 2n = 48 and its karyotype is formed in both sexes by 24 acrocentric chromosome pairs, similar to what has been described for other species of Girella Gray, 1835. El número cromosómico y la morfología del cariotipo de Girella laevifrons (Tschudi 1846) son descritos por primera vez. G. laevifrons presenta un número cromosómico 2n = 48 y su cariotipo está constituido por 24 pares de cromosomas acrocéntricos en ambos sexos, similar a lo documentado previamente para otras especies del género Girella Gray, 1835.
CHROMOSOMES AND Ag-NOR LOCATION IN FLUVIATE POPULATIONS OF SALMO TRUTTA FARIO L. 1758 (SALMONIFORMES: SALMONIDAE) FROM ATACAMA DESERT, CHILE CROMOSOMAS Y LOCALIZACION DE Ag-NOR EN POBLACIONES FLUVIALES DE SALMO TRUTTAFARIO L. 1758 (SALMONIFORMES: SALMONIDAE) DEL DESIERTO DE ATACAMA, CHILE
Irma Northland-Leppe,Natalia Lam,Pedro Jara-Seguel,Juana Capetillo-Arcos
Gayana (Concepción) , 2009,
Abstract: Salmo trutta fario L. 1758, presented a chromosome number 2n = 80 and a fundamental number NF = 100. Thehaploid chromosome set consists of seven metacentric chromosomes, three submetacentric, one subtelocentric and 29 telocentrics. The Ag-NOR are located at conserved position in the short arm of pair 11 (st), with the presence of additional NOR on the short arm of pair 9 (sm) which is rare in others taxa previously studied. Salmo truttafario L. 1758, presenta un número cromosómico 2n=80 y un número fundamental NF=100. El juego cromosómico haploide está constituido por siete cromosomas metacéntricos, tres submetacéntricos, un subtelocéntrico y 29 telocéntricos. Los Ag-NOR se localizan en posición conservada en el brazo corto del par 11 (st), con la existencia de NOR adicionales en el brazo corto del par 9 (sm) el que es poco frecuente en otros taxa previamente estudiados.
Variación aloenzimática y parentesco evolutivo en especies de Microlophus del grupo "peruvianus" (Squamata: Tropiduridae)
VICTORIANO,PEDRO F; TORRES-PéREZ,FERNANDO; ORTIZ,JUAN CARLOS; PARRA,LUIS E; NORTHLAND,IRMA; CAPETILLO,JUANA;
Revista chilena de historia natural , 2003, DOI: 10.4067/S0716-078X2003000100007
Abstract: allozyme variation and evolutionary relationship in species of the genus microlophus of the peruvianus group from 11 localities in chile and southern perú were determined. two external groups (m. occipitalis and m. thoracicus, both from northern perú), were considered to polarize character states in a cladistics analysis. a total of 22 presumptive loci were analysed, of which 18 were variables. the results obtained suggests the presence of three species of microlophus in southern perú and northern chile. two species inhabit intertidal areas; one correspond to m. quadrivittatus which extends from islay in perú (16o59' s, 72o06' w) to antofagasta in chile (23o40' s, 70o26' w). the second species, m. atacamensis, is distribuited from the south of antofagasta to tres playitas in chile (28o 28' s, 71o14' w). the third species corresponds to m. theresioides, which is distribuited in the chilean desert, in pica (20o30' s, 69o20' w), huayca (20o11' s, 69o08' w), and mami?a (20o04' s, 69o13' w), and probably extends to the coastal range of the chilean desert at this latitude. the taxonomic arrangement proposed is according to rogers genetic identity levels, where the respective dendrogram clustered populations in three nodes, one for each species. phylogenetic analysis confirms the existence of three clades corresponding to species suggested by phenetic analysis. we did not detect evidence of monophily of both coastal species. this indicates that m. atacamensis is the sister taxon of m. quadrivittatus - m. theresioides clade. according to this, the adaptation to an intertidal habitat could have originated more than once in the evolutionary history of microlophus of the peruvianus group. another explanation is that this adaptation is plesiomorphic within the group analysed.
Nuevos registros de Cycadales y Cycadeoidales del Triásico superior del río Biobío, Chile
LEPPE,MARCELO; MOISAN,PHILIPPE;
Revista chilena de historia natural , 2003, DOI: 10.4067/S0716-078X2003000300011
Abstract: a contribution to the knowledge of cycadales and cycadeoidales present in the upper triassic of the santa juana formation (carnian-raetian) in the bio-bío region of chile is provided. the groups are represented by the species pseudoctenis longipinnata anderson & anderson, pseudoctenis spatulata du toit and pterophyllum azcaratei herbst & troncoso. a new species pseudoctenis truncata nov. sp. is described. they appear to be related to other typical elements of the paleofloristic assamblages from the south-occidental border of gondwanaland.
Nuevos registros de Cycadales y Cycadeoidales del Triásico superior del río Biobío, Chile New records of Upper Triassic Cycadales and Cycadeoidales of Biobío river, Chile
MARCELO LEPPE,PHILIPPE MOISAN
Revista chilena de historia natural , 2003,
Abstract: Se entrega un aporte al conocimiento de las Cycadales y Cycadeoidales presentes en los sedimentos del Triásico superior de la Formación Santa Juana (Cárnico-Rético) de la Región del Biobío, Chile. Los grupos están representados por las especies Pseudoctenis longipinnata Anderson & Anderson, Pseudoctenis spatulata Du Toit y Pterophyllum azcaratei Herbst & Troncoso, y se propone una nueva especie Pseudoctenis truncata nov. sp. Las especies se encuentran junto a otros elementos típicos de las asociaciones paleoflorísticas del borde suroccidental del Gondwana. A contribution to the knowledge of Cycadales and Cycadeoidales present in the Upper Triassic of the Santa Juana Formation (Carnian-Raetian) in the Bio-Bío Region of Chile is provided. The groups are represented by the species Pseudoctenis longipinnata Anderson & Anderson, Pseudoctenis spatulata Du Toit and Pterophyllum azcaratei Herbst & Troncoso. A new species Pseudoctenis truncata nov. sp. is described. They appear to be related to other typical elements of the paleofloristic assamblages from the south-occidental border of Gondwanaland.
Paleobotánica del Triásico Superior del valle del río Biobío, Chile: Clase Filicopsida
Leppe,Marcelo; Moisan,Philippe; Abad,Eduardo; Palma-Heldt,Sylvia;
Revista geológica de Chile , 2006, DOI: 10.4067/S0716-02082006000100004
Abstract: upper triassic palaeobotany of biobío river valley, chile: filicopsida class. the upper triassic (carnian-norian) filicopsida fossils present in the marine and continental outcrops, informally nominated as santa juana formation in the biobío region of chile (37os/73os), are described. the taphoflora includes ten species, out of which eight are first registers for this area: gleichenites quilacoyensis leppe and moisan sp. nov., asterotheca rigbyana rigbyana herbst, rienitsia colliveri herbst, dictyophyllum fuenzalidai herbst, dictyophyllum (thaumatopteris) rothi frenguelli, chansitheca argentina herbst, cladophlebis kurtzi frenguelli and todites baldoni herbst ; three are new records for the chilean upper triassic: rienitsia colliveri herbst, gleichenites quilacoyensis leppe and moisan sp. nov., and chansitheca argentina herbst. the fern species found represents an 18% of the total specific diversity of plants in the upper triassic rocks from biobío and help to understand the complicate floristic evolution of the communities in gondwana. the triassic rocks from biobío are situated in the context of the southwestern extratropical gondwana. the assemblage was developed in a continental environment with strong marine influence, under a rainy seasonal weather and displays age affinities with the argentinian florian stage (norian-rhaetian). on an evolutionary point of view, the paleoflora was involved into the long triassic/jurassic mass extinction process, that means the end of the 'dicroidium flora' and the start of several elements that will dominate during the jurassic
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