Clinchy M, Barker I K
Biology Department, Queen's University, Kingston, Ontario, Canada.
J Parasitol. 1994 Aug;80(4):663-6.
We enumerated parasite burdens within the blood, gizzard, ceca, and kidneys of adult female lesser snow geese Chen caerulescens caerulescens collected from the breeding colony at La Pérouse Bay, Manitoba, Canada, in 1989. We observed 5 species of nematodes, 1 species of digenean, 1 species of protozoan, and an unidentified microfilaria in these geese. We compared parasite burdens between geese collected during the incubation (2-14 June) and brood-rearing (1-5 August) periods. There was a significant decrease in the prevalence and intensity of the gizzard nematode Amidostomum spatulatum and a significant increase in the prevalence of the renal coccidium Eimeria truncata between the 2 collection periods. We suggest that the changes concerning A. spatulatum reflect transmission conditions some 6 months earlier when the geese were on the wintering grounds. Changes involving E. truncata reflected transmission conditions within the previous month. Consequently, it would appear that breeding colonies are the foci for transmission of E. truncata, a significant pathogen of adults and goslings.
1989年，我们对从加拿大曼尼托巴省拉佩鲁斯湾繁殖地采集的成年雌性小雪雁（Chen caerulescens caerulescens）的血液、砂囊、盲肠和肾脏中的寄生虫负荷进行了计数。我们在这些雪雁中观察到5种线虫、1种复殖吸虫、1种原生动物以及一种未鉴定的微丝蚴。我们比较了在孵化期（6月2日至14日）和育雏期（8月1日至5日）采集的雪雁之间的寄生虫负荷。在这两个采集期之间，砂囊线虫匙形裂口线虫（Amidostomum spatulatum）的感染率和感染强度显著下降，而肾球虫截形艾美耳球虫（Eimeria truncata）的感染率显著上升。我们认为，与匙形裂口线虫有关的变化反映了大约6个月前雪雁在越冬地时的传播条件。涉及截形艾美耳球虫的变化反映了前一个月内的传播条件。因此，繁殖地似乎是截形艾美耳球虫传播的焦点，截形艾美耳球虫是成年雪雁和幼雏的一种重要病原体。
