DISTRIBUTION AND SEASONAL AND DIURNAL ACTIVITY PATTERNS OF EUTROMBICULA-ALFREDDUGESI (ACARI, TROMBICULIDAE) IN A FOREST EDGE ECOSYSTEM
DISTRIBUTION AND SEASONAL AND DIURNAL ACTIVITY PATTERNS OF EUTROMBICULA-ALFREDDUGESI (ACARI, TROMBICULIDAE) IN A FOREST EDGE ECOSYSTEM
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DOI：
10.1093/jmedent/30.1.47
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发表时间：
1993-01-01
影响因子：
2.1
通讯作者：
GOLD, RE
中科院分区：
文献类型：
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作者：
CLOPTON, RE;GOLD, RE
在内布拉斯加州北纬40度-0‘0’-40度-1‘21“范围内，研究了小气候和植被对幼虫种群数量和活动格局的影响。虽然恙螨种群存在于整个森林边缘，但较大的种群集中在矮秆到高草过渡地带。在树冠下的灌木丛中很少发现吸虫。恙螨的活动与小气候驱动的日节律相关。活动在下午晚些时候至傍晚早些时候最大，介于1530至1930小时(CDST)。幼虫活动下降到低水平，并一直保持到日出；这段活动减少的时期发生在1930到0530小时之间。幼虫活动在日出前后(几乎相当于0600-0700小时)略有增加。在700时至1530时之间，阿尔弗雷杜格氏裸眼线虫幼虫处于非活动状态，对正常的采样刺激没有反应。幼虫数量在4月底至5月初出现，6月底和7月初达到高峰，夏末减少，随着地面开始结冰，在仲秋消失。
Microclimatic and vegetative effects on the population size an activity patterns of larval Eutrombicula alfreddugesi Oudemans, 1910 (Acar: Trombiculidae), were investigated in Nebraska between latitude 40-degrees-0'0'' N and 40-degrees-1'21'' N. Larval population densities along a forest edge were greatest in areas of high relative humidity, moderate temperature, low incident sunlight, and increasing substrate vegetation. Although chigger populations existed throughout the forest edge, larger populations concentrated in short- to tall-grass transition zones. Chiggers were rarely found in the undergrowth beneath the tree canopy. Chigger activity correlated with a microclimatically driven diurnal rhythm. Activity was greatest during the late afternoon-early evening, between 1530 and 1930 hours (CDST). Larval activity dropped to low levels and remained so until sunrise; this period of reduced activity occurred between 1930 and 0530 hours. Small increases in larval activity occurred around sunrise (almost-equal-to 0600-0700 hours). Between about 0700 and 1530 hours, larval E. alfreddugesi were inactive and did not respond to normal sampling stimuli. Larval populations appeared in late April through early May, peaked in abundance in late June and early July, diminished through late summer, and disappeared in midautumn as the ground began to freeze.