Department of Entomology, Box 340365, Clemson University, Clemson, South Carolina, 29634-0365.
Mycologia. 2002 Mar-Apr;94(2):200-9.
Trichomycete fungi are common endobionts of aquatic insect larvae, but little is known of their ecology. In this study, the seasonality of trichomycete colonization of larval black flies (Diptera: Simuliidae) was investigated in three streams in northwestern South Carolina. At least eight species of trichomycetes were found in two species of black flies, and 93.8% of 1819 larval black flies examined contained trichomycetes. Significant differences were found in the seasonal prevalence of Harpella melusinae, Simuliomyces microsporus, and Paramoebidium spp. at one of three sites. At this site, the lowest mean prevalence for H. melusinae occurred in winter (67%) versus the other seasons (96-100%), whereas mean prevalence was lowest in summer for Simuliomyces microsporus (1%) versus the other seasons (2-21%) and lowest in summer for P. spp. (9%) versus the other seasons (45-67%). Significant differences in levels of colonization among seasons were not detected. Conjugations of H. melusinae (representing early stages of sexual reproduction) occurred most frequently in the spring and winter (up to 14% of larvae). Sexual reproduction (represented by zygospores) of Legeriomycetaceae occurred most frequently in the spring and fall (up to 17% of larvae).
Trichomycete 真菌是水生昆虫幼虫的常见内共生菌，但它们的生态学知之甚少。本研究调查了南卡罗来纳州西北部三条溪流中幼虫黑蝇（双翅目：Simuliidae） Trichomycete 定殖的季节性。在两种黑蝇中发现了至少 8 种 Trichomycete，在检查的 1819 只幼虫黑蝇中，有 93.8%含有 Trichomycete。在三个地点中的一个地点，发现 Harpella melusinae、Simuliomyces microsporus 和 Paramoebidium spp. 的季节性流行率存在显著差异。在该地点，H. melusinae 的最低平均流行率出现在冬季（67%），而其他季节为 96-100%，而 Simuliomyces microsporus 的平均流行率在夏季最低（1%），而其他季节为 2-21%，P. spp. 的流行率在夏季最低（9%），而其他季节为 45-67%。未检测到季节间定殖水平的显著差异。H. melusinae 的接合（代表有性生殖的早期阶段）最常在春季和冬季发生（高达 14%的幼虫）。Legeriomycetaceae 的有性生殖（代表接合孢子）最常在春季和秋季发生（高达 17%的幼虫）。
