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  • 1
    Electronic Resource
    Electronic Resource
    A Comparative Study of Varroa Jacobsoni Reproduction in Worker Cells of Honey Bees (Apis Mellifera) in England and Africanized Bees in Yucatan, Mexico (1999)
    Springer
    Experimental and applied acarology 23 (1999), S. 659-667 
    Details
    ISSN: 1572-9702
    Keywords: Varroa jacobsoni ; Apis mellifera ; mite reproduction ; Africanized bees ; mite tolerance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The aim of this study was to investigate an underlying mechanism of the apparent tolerance of Africanized honey bees (AHB) to Varroa jacobsoni mites in Mexico. This was achieved by conducting the first detailed study into the mites' reproductive biology in AHB worker cells. The data was then compared directly with a similar study previously carried out on European honey bees (EHB) in the UK. A total of 1071 singly infested AHB worker cells were analyzed and compared with the data from 908 singly infested EHB worker cells. There was no significant difference between the number of mother mites dying in the cells (AHB = 2.0%, EHB = 1.8%); the mean number of eggs laid per mite (AHB = 4.86, EHB = 4.93); the number of mites producing no offspring (AHB = 12%, EHB = 9%); and developmental times of the offspring in worker cells of AHB and EHB. However, there was a major difference between the percentage of mother mites producing viable adult female offspring (AHB = 40%, EHB = 75%). This was caused by the increased rate of mite offspring mortality suffered by the first (male) and second (female) offspring in AHB worker cells. Therefore, only an average of 0.7 viable adult female offspring are produced per mite in AHB, compared to 1.0 in EHB.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006275525463
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Informe final. Investigación situación pesquería pelágica zona norte, 2007. (2015)
    Instituto de Fomento Pesquero | Valparaíso, Chile
    Details
    Publication Date: 2021-05-19
    Description: Se analizan los principales indicadores biológicos-pesqueros de las especies objetivos que sostuvieron la actividad extractiva de la zona norte (XV a IV región) en el 2007, comparándose con la serie histórica reciente. Se entregan los resultados operacionales de la actividad de la flota, centrando el análisis en la captura, esfuerzo, rendimiento y en los indicadores biológicos más relevantes, como son la composición de talla-edad y los índices reproductivos y de reclutamiento.
    Description: It discusses the main biological indicators-fishing of target species that supported the extraction of the northern (XV-IV region) in 2007 and compared with recent time series. This paper gives the results of operations of the activity of the fleet, focusing the analysis on the catch, effort, performance and the most important biological indicators, such as size, age composition and reproductive and recruitment rates.
    Description: Published
    Keywords: Biomass ; Landing statistics ; Recruitment ; Spawning ; Stock assessment ; Age determination ; Size-at-age ; Length-weight relationships ; Salinity ; Sexual maturity ; Biological data ; Trachurus murphyi ; Sardinops sagax ; Engraulis ringens ; Scomber japonicus
    Repository Name: AquaDocs
    Type: Report , Non Refereed
    Format: 191pp.
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    PAPER (OA)
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