999 resultados para Asquith, Herbert Henry (1852-1928)
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[Loi (Recueil). 1563-1852]
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[Loi (Recueil). 1563-1852]
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Kirje 19.12.1928
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Life table analyses have been developed to understanding the impact of various sources of intrinsic and extrinsic mortalities on the rate of population growth. The understanding of the population increase of the parasitoids related to their hosts is important in biological control programs. This work had as objective to evaluate the survival and fertility of the parasitoid Lysiphlebus testaceipes (Cresson, 1880) on Schizaphis graminum (Rondani, 1852) as a host under fertility life table. The experiment were carried out in a climatic chamber at 25 ± 1ºC, RH 60 ± 10% and 10h photophase. To determine the immature mortality, the development time and the sex ratio of the parasitoid, 12 females of the parasitoid (less than one day old) and 240 nymphs of S. graminum (3 days old) were used. To evaluate the longevity and fertility of L. testaceipes, 15 females (less than one day old) were used. Nymphs of S. graminum (3 days old) were offered for each parasitoid female daily, until the female died, being in the 1st day - 300 nymphs; 2nd day - 250 nymphs; 3rd day - 200 nymphs; 4th day - 150 and in the other days a number of 50 nymphs. L. testaceipes had an immature mortality of 22,2%, and a development time of males and females of 9.0 and 9.1 days, respectively. The females of L. testaceipes laid, in it first life day, 257.8 eggs, and they survived up until seven days. The net reproduction rate (Ro) and the intrinsic rate of increase (r m) were respectively, 301.9 and 0.513. The finite rate of increase (l) was 1.67 females per day, the mean length of a generation (T) was 11.13 days and the time to duplicate the population (TD) was 1.35 weeks. The parasitoid L. testaceipes have a high potential of population growth on S. graminum as a host under the analyzed conditions.
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Hybotinae is being recorded for the first time to Dominican Republic where the subfamily becomes represented by the genera Euhybus Coquillett, 1895, Neohybos Ale-Rocha & Carvalho, 2003 and Syneches Walker, 1852. Euhybus and Neohybos occur exclusively in the Americas, and Syneches is cosmopolitan. Six new species are described and illustrated: Euhybus martiniensis sp. nov., Neohybos cinereus sp. nov., N. longicornis sp. nov., N. pruinosus sp. nov., N. setosus sp. nov. and Syneches dominicanus sp. nov.. Identification keys are provided for the species of the three hybotine genera registered in West Indies. The following species are recorded for the first time from the Dominican Republic: Syneches inversus Curran, 1928, S. pallidus Wilder, 1974 and S. vineus Wilder, 1974. The previously unknown female of S. inversus is described.
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Replication Template for Improving Transition Outcomes Henry County Transition Partners Prototype. This concise document will help you build a community team and the infrastructure necessary to implement and plan for sustaining specific initiatives.
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Part 1 of 7 for Henry County's Transition Partners Guidebook specific to youth with disabilities transitioning from high school to employment, post-secondary education, or adult services.
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Part 2 of 7 for Henry County's Transition Partners Guidebook specific to youth with disabilities transitioning from high school to employment, post-secondary education, or adult services.
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Part 3 of 7 for Henry County's Transition Partners Guidebook specific to youth with disabilities transitioning from high school to employment, post-secondary education, or adult services.
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Part 4 of 7 for Henry County's Transition Partners Guidebook specific to youth with disabilities transitioning from high school to employment, post-secondary education, or adult services.
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Part 5 of 7 for Henry County's Transition Partners Guidebook specific to youth with disabilities transitioning from high school to employment, post-secondary education, or adult services.
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Part 6 of 7 for Henry County's Transition Partners Guidebook specific to youth with disabilities transitioning from high school to employment, post-secondary education, or adult services.