Pryor Gregory S, Greiner Ellis C
Department of Zoology, University of Florida, 223 Bartram Hall, Gainesville, Florida 32611-8525, USA.
J Parasitol. 2004 Feb;90(1):189-91. doi: 10.1645/GE-3136RN.
We describe the first account of the nematode Gyrinicola batrachiensis in the gastrointestinal tracts of tadpoles of Bufo terrestris, Gastrophryne carolinensis, Hyla femoralis, H. squirella, Rana heckscheri, and R. utricularia. Infection by G. batrachiensis was also noted in tadpoles of R. catesbeiana and R. clamitans, species previously described as harboring these nematodes. These observations represent a major expansion of the known geographical range of G. batrachiensis to include the southeastern United States. In our study, female G. batrachiensis nematodes in ranid host species were didelphic, but females in B. terrestris tadpoles were monodelphic. Furthermore, only female nematodes were found in the latter host species. Such variations in nematode uterine morphology and sex ratios among these tadpole host species are in accordance with the apomictic and haplodiploid reproductive strategies previously reported for G. batrachiensis. These observations also support a generalized pattern relating G. batrachiensis reproductive modes and the life cycles of their tadpole hosts.
我们首次描述了在北美牛蛙、卡罗林狭口蛙、股孔雨蛙、松鼠雨蛙、赫氏蛙和囊蛙蝌蚪的胃肠道中发现的蛙泳线虫。在牛蛙和绿蛙蝌蚪中也发现了蛙泳线虫感染，这两种蛙此前被描述为携带这些线虫的物种。这些观察结果表明，蛙泳线虫已知的地理分布范围大幅扩展，已包括美国东南部。在我们的研究中，蛙科宿主物种中的雌性蛙泳线虫是双子宫的，但北美牛蛙蝌蚪中的雌性是单子宫的。此外，在后一种宿主物种中只发现了雌性线虫。这些蝌蚪宿主物种中线虫子宫形态和性别比例的这种差异与先前报道的蛙泳线虫的孤雌生殖和单倍体二倍体生殖策略一致。这些观察结果还支持了一种普遍模式，即蛙泳线虫的生殖模式与其蝌蚪宿主的生命周期相关。
