Phenotypic analysis of adults of Fasciola hepatica, Fasciola gigantica and intermediate forms from the endemic region of Gilan, Iran
Phenotypic analysis of adults of Fasciola hepatica, Fasciola gigantica and intermediate forms from the endemic region of Gilan, Iran
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DOI：
10.1016/j.parint.2006.06.003
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发表时间：
2006-12-01
影响因子：
1.9
通讯作者：
Mas-Coma, S.
中科院分区：
文献类型：
--
作者：
Ashrafi, K.;Valero, M. A.;Mas-Coma, S.
片形吸虫病是由肝片形吸虫和巨大片形吸虫引起的一种重要的人类和动物疾病。在伊朗，这两个物种的分布在大多数地区重叠，包括北部人类流行省份吉兰，该省的牛和水牛中同时发现了这两种片状寄生虫。使用传统显微测量和异速生长模型，通过详尽的形态计量分析，对来自吉兰自然感染牛的片状吸虫成虫进行了表型研究。将伊朗片形类与 E hepatica 和 F gigantica 标准种群进行比较，即来自两个物种不共存的地理区域（分别为玻利维亚和布基纳法索）。尽管形态测量值有些重叠，但异速生长存在明显差异。异速生长函数调整为25对变量。结果显示，伊朗类肝 F. 样体比 F. hepatica 标准体大，伊朗 F. gigantica 样比 F. gigantica 标准体更长、更窄，但体面积更小。允许对异域种群进行特定区分的测量（腹侧吸盘与身体后端之间的距离；体长与体宽之间的比率）在吉兰标本中重叠，从而证明了中间形式的存在。与标准种群相比，不同的伊朗片形类在类 F. gigantica 标本中表现出比在 F. hepatica 样标本中更大的差异。这项研究表明，即使在存在中间形式的区域，简单的传统显微测量可能足以表征片状花苷的形态特征。 (c) 2006 Elsevier Ireland Ltd. 保留所有权利。
Fascioliasis is an important human and animal disease caused by Fasciola hepatica and Fasciola gigantica. In Iran, the distribution of these two species overlaps in most areas, including the northern human endemic province of Gilan where both fasciolids are simultaneously found in individual cattle and buffaloes. A phenotypic study of fasciolid adult flukes from naturally infected bovines from Gilan was carried out by means of an exhaustive morphometric analysis using traditional microscopic measurements and an allometric model. The Iranian fasciolids were compared to E hepatica and F gigantica standard populations, i.e. from geographical areas where both species do not co-exist (Bolivia and Burkina Faso, respectively). Although morphometric values somewhat overlapped, there were clear differences in allometric growth. The allometric function was adjusted to 25 pairs of variables. Results obtained revealed that Iranian F hepatica-like specimens are larger than the F hepatica standard and Iranian F. gigantica-like specimens are longer and narrower than the F gigantica standard, but with smaller body area. Measurements which permit a specific differentiation in allopatric populations (distance between ventral sucker and posterior end of the body; ratio between body length and body width) overlap in the specimens from Gilan, thus proving the presence of intermediate forms. When compared to the standard populations, the different Iranian fasciolid morphs show greater differences in F gigantica-like specimens than in F hepatica-like specimens. This study shows that simple, traditional microscopic measurements may be sufficient for the morphometric characterisation of fasciolids, even in areas where intermediate forms are present. (c) 2006 Elsevier Ireland Ltd. All rights reserved.