Patterns of gregarine parasitism in dragonflies: host, habitat, and seasonality
Patterns of gregarine parasitism in dragonflies: host, habitat, and seasonality
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蜻蜓的寄生模式：寄主、栖息地和季节性
DOI：
10.1007/s00436-010-1836-8
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发表时间：
2010
影响因子：
2
通讯作者：
D. Vodopich
中科院分区：
文献类型：
--
作者：
J. Locklin;D. Vodopich
Gregarines 是一种普遍存在的原生动物寄生虫，可感染全世界的节肢动物。已描述了超过 1,600 种聚居动物，但仅对一小部分无脊椎动物进行了这些顶复门寄生虫的调查。对美国德克萨斯州两个水库的成年蜻蜓种群进行了为期两年的调查。对寄主性别和宿主之间、翅膀负载之间以及不同时间之间的格雷加林流行率和强度进行了比较。在收集的 29 种蜻蜓中，41% 的蜻蜓身上有蜻蜓。其中九种蜻蜓此前未被记录为宿主。在常见收集的宿主中，患病率范围为 18% 至 52%。寄生虫在宿主之间聚集，每个宿主的平均强度为 5 个寄生虫。仅在超过最小翅膀负载的寄主中发现了聚水蚁，这表明聚水蚁在羽化过程中可能不会从水虫转移到成虫身上。这两年的患病率和强度均有所增加，表明聚卵囊的活力与宿主种群密度的增加相一致，并且可能是短暂的。两个水库蜻蜓种群的流行率和强度也不同。回归分析显示，寄主物种、寄主性别、月份和年份是与聚积菌流行率和强度相关的重要解释变量。关于蜻蜓分布、多样性和交配活动的丰富信息使蜻蜓-篦麻系统成为生态、进化和寄生虫学研究的绝佳途径。我们的结果强调了在研究灰蜻蜓生态学时考虑季节、寄主和栖息地的重要性。
Gregarines are ubiquitous protozoan parasites that infect arthropods worldwide. More than 1,600 gregarine species have been described, but only a small percentage of invertebrates have been surveyed for these apicomplexan parasites. Adult dragonfly populations were surveyed for gregarines at two reservoirs in Texas, USA for 2 years. Gregarine prevalence and intensity were compared intraspecifically between host genders and reservoirs, among wing loads, and through time. Of the 29 dragonfly species collected, 41% hosted gregarines. Nine of these dragonfly species were previously undocumented as hosts. Among the commonly collected hosts, prevalence ranged from 18 to 52%. Parasites were aggregated among hosts and had a median intensity of five parasites per host. Gregarines were found only in hosts exceeding a minimum wing load, indicating that gregarines are likely not transferred from the naiad to adult during emergence. Prevalence and intensity increased during both years, suggesting that gregarine oocyst viability parallels increasing host population densities and may be short-lived. Prevalence and intensity also differed between dragonfly populations at two reservoirs. Regression analyses revealed that host species, host gender, month, and year were significant explanatory variables related to gregarine prevalence and intensity. Abundant information on odonate distributions, diversity, and mating activities makes dragonfly–gregarine systems excellent avenues for ecological, evolutionary, and parasitological research. Our results emphasize the importance of considering season, hosts, and habitat when studying gregarine–dragonfly ecology.