Life Cycle of Uncinaria lucasi Stiles, 1901 (Nematoda : Ancylostomatidae) of Fur Seals, Callorhinus ursinus Linn., on the Pribilof Islands, Alaska

Ow, Olsen; Et, Lyons

doi:10.2307/3276141

Cited by 64 publications

(38 citation statements)

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“…Comparison of current fi ndings on prevalence of U. lucasi in dead NFS pups with published data from similar studies (Olsen, 1958;Lyons, 1963;Lyons et al, 2000;Ionita et al, 2008;Lyons et al, 2012) revealed decrease of hookworm prevalence during last decades (fi g. 5).…”

Section: Resultsmentioning

confidence: 82%

“…Th e fi nding of adult hookworms in the intestines of NFS male in 2011 is interesting. Olsen (1958) examined 1,426 yearling and older NFS for intestinal infections with hookworms and found none of them infected. Apparently he did gross examination of the entire small intestines in about 500 to 600 of these NFS and for the other half of the NFS, he looked at only the ileoceal junction (typical site of concentration of hookworms in NFS) or just did fl otation of feces for presence of eggs.…”

Section: Resultsmentioning

confidence: 99%

“…Previously, uncinariosis was an extremely important cause of mortality of NFS pups (Olsen, 1958;Lyons, 1963;Lyons et al, 2000 on the Pribilof Islands. Recent research has documented the tremendous decline in prevalence of these parasites since the 1950s and 1960s .…”

Section: Introductionmentioning

confidence: 99%

“…Th eir aim was to reduce morbidity and mortality caused by these parasites in pups . Th ese researchers explored several aspects of biology and ecology of U. lucasi (Olsen, 1958); however the life cycle and transmission of this parasite in the NFS population on St. Paul Island were unknown at that time.…”

Section: Introductionmentioning

confidence: 99%

“…Th e main aim was to necropsy dead pups and to follow the prevalence pattern of U. lucasi in them over time (Lucas 1899;Olsen 1958;Lyons, 1963;Lyons et al, 2000Lyons et al, , 2012.…”

Section: Introductionmentioning

confidence: 99%

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Prevalence of Hookworms, Uncinaria Lucasi (Ancylostomatidae), In Northern Fur Seals (Callorhinus Ursinus) On St. Paul Island, Alaska

Lyons¹,

Kuzmina²,

Carie³

et al. 2014

Vestnik Zoologii

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Prevalence of Hookworms, Uncinaria lucasi (Anсylostomatidae), in Northern Fur Seals (Callorhinus ursinus) on St. Paul Island, Alaska. Lyons, E. T., Kuzmina, T. A., Carie, J. L., Tolliver, S. C., Spraker, T. R. -Review of main studies on biology and ecology of the hookworm Uncinaria lucasi Stiles, 1901 performed on St. Paul Island, Alaska, is presented. Current data on prevalence of adult hookworms parasitizing northern fur seals (NFS), Callorhinus ursinus Linnaeus, 1758, were obtained based on the examination of the intestines of dead NFS pups and subadult 3-4 year-old males in July and August of 2011-2013. In addition, blubber samples collected from subadult NFS males were examined for parasitic third stage hookworm larvae (L 3 ). All current data were compared with previously published studies performed in 1950s -1960s. Current prevalence of U. lucasi in dead pups collected from Reef Rookery was 4.9 % in 2011, 0 % in 2012 and 10.5 % in 2013. Th is rookery has a rocky substrate. On sandy rookeries prevalence was up to 75 % on Morjovi Rookery and 50 % on Vostochni Rookery. Parasitic L 3 were recovered in 2.5 % of subadult males examined in 2013. Decreasing prevalence of hookworm infection of dead pups and subadult males during the last several years follows the tremendous decline in the number of fur seals in the herd on St. Paul Island during last several decades. Распространение анкилостом, Uncinaria lucasi (Anсylostomatidae), у северных морских котиков (Callorhinus ursinus) на острове Св. Павла, Аляска. Лайонс E. T., Кузьмина T. A., Карие Дж. Л., Толливер Ш. К., Спрейкер T. Р. -Представлен обзор основных исследованний по биологии и экологии анкилостомы Uncinaria lucasi Stiles, 1901, проведенных на о. Св. Павла, Аляска. Данные об экстенсивности инвазии северных морских котиков (NFS), Callorhinus ursinus Linnaeus, 1758, взрослыми анкилостомами были получены при исследовании кишечников погибших щенков северного морского котика, а также молодых самцов (возраст 3-4 года) с июля по август 2011-2013 гг. Кроме кишечников, на наличие паразитических личинок унцинарий 3-й стадии (L 3 ) были собраны и исследованы пробы брюшного жира от молодых самцов. Экстенсивность инвазии (ЭИ) щенков котиков унцинариями на лежбище Риф с каменистым субстратом составляла 4,9 % в 2011 г., 0 % -в 2012 г. и 10,5 % -в 2013 г.; в то время как на песчаных лежбищах ЭИ была намного больше (75 % на лежбище Моржовое и 50 % на лежбище Восточное). Паразитические личинки L 3 были обнаружены в 2013 г. в 2,5 % проб от молодых самцов. Результаты сравнения наших данных с данными исследований 1950-1960-х гг. показали, что продолжающаяся тенденция по снижению ЭИ унцинарий в кишечниках погибших щенков и в брюшном жире молодых самцов северного морского котика является результатом снижения численности популяции северных морских ко-тиков на о. Св. Павла за последние десятилетия. К л ю ч е в ы е с л о в а: анкилостомы, Uncinaria lucasi, северный морской котик, Callorhinus ursinus, о. Св. Павла, Аляска.

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Section: Resultsmentioning

confidence: 82%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Th e main aim was to necropsy dead pups and to follow the prevalence pattern of U. lucasi in them over time (Lucas 1899;Olsen 1958;Lyons, 1963;Lyons et al, 2000Lyons et al, , 2012.…”

Section: Introductionmentioning

confidence: 99%

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