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  • 1
    ISSN: 1573-6857
    Keywords: Drosophila buzzatii ; environmental variability ; genetic and phenotypic correlations ; heritability ; size-related traits
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Recent studies have shown that body size is a heritable trait phenotypically correlated with several fitness components in wild populations of the cactophilic fly Drosophila buzzatii. To obtain further information on size-related variation, heritabilities as well as genetic and phenotypic correlations among size-related traits of several body parts (head, thorax and wings) were estimated. The study was carried out on an Argentinean natural population in which size-related selection was previously detected. The genetic parameters were estimated using offspring-parent regressions (105 families) in the laboratory G2 generation of a sample of wild flies. The traits were also scored in Wild-Caught Flies (WCF). Laboratory-Reared Flies (LRF) were larger and less variable than WCF. Although heritability estimates were significant for all traits, heritabilities were higher for thorax-wing traits than for head traits. Phenotypic and genetic correlations were all positive. The highest genetic correlations were found between traits which are both functionally and developmentally related. Genetic and phenotypic correlations estimated in the lab show similar correlation patterns (r = 0.49; TP = 0.02, Mantel's test). However, phenotypic correlations were found to be typically larger in WCF than in LRF. The genetic correlation matrix estimated in the relatively homogeneous lab environment is not simply a constant multiplicative factor of the phenotypic correlation matrix estimated in WCF.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1573-6857
    Keywords: thorax length ; Drosophila buzzatii ; life history traits ; longevity ; natural selection
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The correlation between body size and longevity was tested in an Argentinian natural population of Drosophila buzzatii. Mean thorax length of flies newly emerging from rotting cladodes of Opuntia vulgaris was significantly smaller than that of two samples of flies caught at baits. The present results which might be interpreted as directional selection for longevity favoring larger flies are in agreement with previous results achieved in a Spanish natural population of D. buzzatii. Flies emerging from different substrates showed significant differences in thorax length, suggesting that an important fraction of phenotypic variance can be attributed to environmental variability. However, laboratory and field work in different populations of D. buzzatii showed a significant genetic component for thorax length variation.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1573-6857
    Keywords: inversion polymorphism ; Drosophila buzzatii ; longevity selection ; size/shape-related variation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Size-related phenotypic variation among second-chromosome karyotypes inDrosophila buzzatii was examined in an Argentinian natural population. For all measured traits (thorax and wing length; wing, head and face width), this inversion polymorphism exhibited a significant and (additive) linear contribution to the phenotypic variance in newly emerged wild flies. The results suggest that only overall body size, and not body shape, is affected. as no karyotypic variation was found for any trait when the effects of differences in within-karyotype size were removed with Burnaby's method. Likewise, in an experiment of longevity selection in the wild, variation in chromosomal frequencies was verified in the direction predicted on the basis of: (i) previous studies on longevity selection for body size in the wild and (ii) the pattern of chromosomal effects we observed on size. The direction of such selection is consistent with a pattern of antagonistic selection detected in previous studies on the inversion polymorphism.
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  • 4
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    Facultad de Ciencias Naturales y Museo (FCNyM), Universidad Nacional de La Plata (UNLP) | La Plata, Argentina
    In:  lucila@ilpla.edu.ar | http://aquaticcommons.org/id/eprint/11038 | 196 | 2013-03-21 13:10:15 | 11038 | Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata
    Publication Date: 2021-06-26
    Description: Esta serie tiene como finalidad dar a conocer las especies presentes en los diferentes estados provinciales. Tomando como base los trabajos de López et al., (2003); Reis et al., (2003); Liotta (2006) y Ferraris (2007) hemos actualizado el elenco ictiofaunístico en cada territorio provincial, siguiendo la macrosistemática de Nelson (2006). No se realizan, con excepción del nombre vulgar y localidad tipo, comentarios ni observaciones sobre las especies señaladas ya que estos se encuentran en la bibliografía adjunta. Se incluyen dos tablas que contienen información sobre especies introducidas y de aquellas de presencia dudosa o que requieren confirmación en el territorio provincial. En este último caso se cita el trabajo que las menciona por primeravez.Consideramos que este modesto aporte contribuirá a precisar el conocimiento ictiofaunístico regional ya que además de la lista de especies, presentamos el marco biogeográfico e hídrico correspondiente. Por otra parte, entendemos que la participación de autores involucrados en la regiónconsiderada, le da un verdadero sentido federal a esta contribución, además de reforzar vínculos entre los protagonistas de nuestra especialidad. En estenuevo número, presentamos la provincia de San Juan que se encuentra enclavada en el centro-oeste de nuestro territorio, limitada por las provincias de La Rioja, Mendoza y San Luis.Se presenta por primera vez una lista exhaustiva de la ictiofauna de laprovincia de San Juan basada en la revisión bibliográfica y de material de referencia de las colecciones Ictiológicas de la Universidad Nacional de San Juan y del Museo de La Plata. Se citan 21 especies, de las cuales 15 no habían sido mencionadas con anterioridad (Arratia et al., 1983; Murúa y Acosta, 1997; Liotta, 2006). Ocho especies han sido introducidas principalmente con fines deportivos. Se menciona la presencia de Percichthys chilensis, lo queconstituiría el primer registro formal de esta especie ya que López-Arbarello (2004) la menciona para el Río Tunuyán (Mendoza), sin material de referencia.
    Description: Programa para el Estudio y uso sustentable de la biota austral (ProBiota), FCNyM, UNLP
    Description: Debe citarse: ACOSTA, J. C.; A. LASPIUR; G. M. BLANCO; L. C. PROTOGINO & D. O. NADALIN. 2013. Lista de los peces de la provincia de San Juan. ProBiota, FCNyM, UNLP, La Plata, Argentina, Serie Técnica y Didáctica 19: 1-10. ISSN 1515-9329.
    Keywords: Biology ; Argentina ; San Juan province - Provincia de San Juan ; Ichthyology ; Ictiología ; Biogeography ; Biogeografía
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 10
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  • 5
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    Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata | La Plata, Argentina
    In:  http://aquaticcommons.org/id/eprint/1583 | 196 | 2013-05-07 13:02:18 | 1583 | Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata
    Publication Date: 2021-07-09
    Description: Secretaría de Política Ambiental, Gobierno de la Provincia de Buenos Aires
    Description: ProBiota: Programa para el Estudio y Uso Sustentable de la Biota Austral
    Description: COBIOBO (Comision de Biodiversidad Bonarense) no. 4
    Keywords: Ecology ; Education ; Health ; Biology ; Environment ; Diptera ; vectors ; Buenos Aires Province ; Argentina
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
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