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  • 1
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    Species and size relationships within schools of yellowfin and skipjack tuna as indicated by catches in the Eastern Tropical Pacific Ocean (2021)
    In:  http://aquaticcommons.org/id/eprint/2338 | 8 | 2011-09-29 19:14:23 | 2338 | Inter-American Tropical Tuna Commission
    Details
    Publication Date: 2021-07-13
    Description: ENGLISH: Yellowfin tuna, Neothunnus macropterus, and skipjack tuna, Katsuwonus pelamis, are fished intensively off the west coast of the Americas in an area from about the California-Mexico border in the north to the Peru-Chile border in the south. The historical development of this fishery, and its expansion by the long-range California fleets of bait and purse-seine vessels, are well documented by Godsil (1938), Scofield (1951) and Shimada and Sehaefer (1956). The quarterly distribution of the tuna catches within this area has been reported for some recent years by Alverson (1959).SPANISH: Los atunes aleta amarilla, Neothunnus macropterus, y barrilete, Katsuwonus pelamis, son pescados con intensidad frente a la costa occidental del continente americano, en un área comprendida más o menos entre la frontera California-México en el norte y el límite Perú-Chile en el sur. El desarrollo histórico de esta pesquería y la expansión que le han dado las flotas californianas de largo radio de acción, formadas por los barcos de carnada y rederos, están bien documentados por Godsil (1938), Scofield (1951) y Shimada y Schaefer (1956). La distribución trimestral de las pescas de atún dentro de esta área ha sido tratada por Alverson (1959) con referencia a años recientes.
    Description: This article is bilingual and contains both Spanish and English Translations.
    Keywords: Fisheries ; Yellowfin tuna ; Neotbunnus macropterus ; skipjack tuna ; Katsuwonus pelamis ; fishery ; atunes aleta amarilla ; barrilete ; pesquería
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 447-492
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  • 2
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    Some factors affecting the distribution and apparent abundance of yellowfin and skipjack tuna in the Eastern Pacific Ocean (2021)
    In:  http://aquaticcommons.org/id/eprint/2618 | 8 | 2011-09-29 18:47:49 | 2618 | Inter-American Tropical Tuna Commission
    Details
    Publication Date: 2021-06-26
    Description: ENGLISH: Since 1951, the Inter-American Tropical Tuna Commission has been investigating the biology, ecology and population dynamics of the yellowfin tuna, Thunnus albacares, and the skipjack tuna, Katsuwonus pelamis, in the Eastern Pacific Ocean. Of particular importance has been the study of the effects of fishing and of fishery-independent factors on the abundance and distribution of these tunas. For yellowfin tuna there is, on the average, an inverse relationship between total fishing effort and apparent abundance (Schaefer, 1957a). For skipjack there is no evidence to suggest that fishing effort has ever been sufficiently intense to affect measurably the abundance (Schaefer, 1961). Rather, it appears that the year-to-year fluctuations in apparent abundance are independent of the activities of the fishing fleets.SPANISH: Desde 1951 la Comisión Interamericana del Atún Tropical se ha dedicado a la investigación de la biología, ecología y la dinámica de las poblaciones del atún aleta amarilla, Thunnus albacares, y del barrilete, Katsuwonus pelamis, en el Océano Pacífico del Este. De importancia especial ha sido el estudio de los efectos de la pesca y de los factores independientes de las pesquerías sobre la abundancia y la distribución de esos atunes. En cuanto al atún aleta amarilla, existe, en promedio, una relación inversa entre el esfuerzo total de pesca y la abundancia aparente (Schaefer, 1957a) . Con respecto al barrilete, no hay evidencia que haga pensar que el esfuerzo de pesca haya sido nunca lo suficientemente intenso como para afectar sensiblemente la abundancia (Schaefer, 1961). Más bien parece que las fluctuaciones de un año a otro en su abundancia aparente, son independientes de las actividades de las flotas pesqueras.
    Description: This article is bilingual and contains both Spanish and English translations.
    Keywords: Fisheries ; distribution ; abundance ; yellowfin tuna ; Thunnus albacares ; skipjack tuna ; Katsuwonus pelamis ; Eastern Pacific Ocean ; distribución ; abundancia ; atún aleta amarilla ; barrilete ; Océano Pacífico Oriental
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 417-474
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  • 3
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    Recent changes in the efficiency of vessels fishing for yellowfin tuna in the eastern Pacific Ocean (2021)
    In:  http://aquaticcommons.org/id/eprint/2584 | 8 | 2011-09-29 18:55:33 | 2584 | Inter-American Tropical Tuna Commission
    Details
    Publication Date: 2021-06-25
    Description: ENGLISH: Since the inception of the Inter-American Tropical Tuna Commission in 1950, one of the primary tasks of its scientific staff has been the collection and analysis of the statistics of total catch, effort expended in obtaining this catch, and the apparent abundance of yellowfin tuna (Neothunnus macropterus) and the skipjack tuna (Katsuwonus pelamis) in the Eastern Pacific Ocean. A concentrated effort by the staff during 1951 and 1952 resulted in the compilation of a series of historical data on the catch and catch-per-effort of tropical tunas for the years 1934-1950, and in the establishment of a detailed logbook system to monitor the current activities of the tuna fleets. Schaefer (1953) and Shimada and Schaefer (1956) have reviewed in detail the methods of collection and analysis of these data. Further studies, based on these and subsequently collected records, are contained in publications by Schaefer (1957), Shimada (1958), Alverson (1959, 1960), Griffiths (1960) and Calkins (1961).SPANISH: Desde que la Comisión Interamericana del Atún Tropical comenzó sus funciones en 1950, entre las más importantes tareas de su personal científico incluyó la recolección y análisis de las estadísticas de la captura total, del esfuerzo empleado en obtener esta captura y de la abundancia aparente de los atunes aleta amarilla (Neothunnus macropterus) y barriletes (Katsutvonus pelamis) en el Océano Pacífico Oriental. El concentrado esfuerzo del personal científico de la Comisión durante 1951 y 1952 dió como resultado la compilación de una serie de datos históricos sobre la captura de atunes tropicales y sobre la captura según el esfuerzo durante los años 1934 a 1950, así como el establecimiento de un sistema detallado de registro de las anotaciones en los cuadernos de bitácora para vigilar las actividades diarias de las flotas atuneras. Schaefer (1953) y Shimada y Schaefer (1956) han expuesto detalladamente los métodos de recolección y análisis de dichos datos. Otros estudios, basados en estos registros y en los recolectados posteriormente, se encuentran en las publicaciones de Schaefer (1957), Shimada (1958), Alverson (1959, 1960), Griffiths (1960) y Calkins (1961).
    Description: This article is bilingual and contains both Spanish and English translations.
    Keywords: Fisheries ; efficiency ; fishing ; yellowfin tuna ; Neothunnus macropterus ; skipjack tuna ; Katsuwonus pelamis ; eastern Pacific Ocean ; eficiencia ; pesca ; aleta amarilla ; barriletes ; Océano Pacífico Oriental
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 281-332
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  • 4
    Electronic Resource
    Electronic Resource
    Partial purification and characterization of a DNA helicase from chloroplasts of Glycine max (1990)
    Springer
    Plant molecular biology 15 (1990), S. 457-464 
    Details
    ISSN: 1573-5028
    Keywords: chloroplasts ; DNA helicase ; DNA replication
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A DNA helicase activity was detected in extracts of purified chloroplasts from the SB-1 cell line of Glycine max and partially purified by column chromatography on DEAE cellulose, phosphocellulose, and single-stranded DNA cellulose. The chloroplast helicase has a DNA-dependent ATPase activity, and its strand displacement activity is strictly dependent upon the presence of a nucleoside triphosphate and Mg2+ or Mn2+. Strand displacement activity does not require a free unannealed single-strand or replication fork-like structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00019162
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  • 5
    Electronic Resource
    Electronic Resource
    Analysis of soybean chloroplast DNA replication by two-dimensional gel electrophoresis (1993)
    Springer
    Plant molecular biology 23 (1993), S. 779-792 
    Details
    ISSN: 1573-5028
    Keywords: chloroplast ; DNA replication ; origin ; soybean ; two-dimensional gel electrophoresis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Chloroplast DNA replication was studied in the green, autotrophic suspension culture line SB-1 of Glycine max. Three regions (restriction fragments Sac I 14.5, Pvu II 4.1 and Pvu II 14.8) on the plastome were identified that displayed significantly higher template activity in in vitro DNA replication assays than all other cloned restriction fragments of the organelle genome, suggesting that these clones contain sequences that are able to direct initiation of DNA replication in vitro. In order to confirm that the potential in vitro origin sites are functional in vivo as well, replication intermediates were analyzed by two-dimensional gel electrophoresis using cloned restriction fragments as probes. The two Pvu II fragments that supported deoxynucleotide incorporation in vitro apparently do not contain a functional in vivo replication origin since replication intermediates from these areas of the plastome represent only fork structures. The Sac I 14.5 chloroplast DNA fragment, on the other hand, showed intermediates consistent with a replication bubble originating within its borders, which is indicative of an active in vivo origin. Closer examination of cloned Sac I 14.5 sub-fragments confirmed high template activity in vitro for two, S/B 5 and S/B 3, which also seem to contain origin sites utilized in vivo as determined by two-dimensional gel electrophoresis. The types of replication intermediate patterns obtained for these sub-fragments are consistent with the double D-loop model for chloroplast DNA replication with both origins being located in the large unique region of the plastome [17, 18]. This is the first report of a chloroplast DNA replication origin in higher plants that has been directly tested for in vivo function.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00021533
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