FACTORS AFFECTING SEASONAL DISPERSAL OF THE TSETSE-FLIES GLOSSINA-PALLIDIPES AND G-LONGIPENNIS (DIPTERA, GLOSSINIDAE) AT NGURUMAN, SOUTH-WEST KENYA
FACTORS AFFECTING SEASONAL DISPERSAL OF THE TSETSE-FLIES GLOSSINA-PALLIDIPES AND G-LONGIPENNIS (DIPTERA, GLOSSINIDAE) AT NGURUMAN, SOUTH-WEST KENYA
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DOI：
10.1017/s0007485300051695
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发表时间：
1992-06-01
影响因子：
1.9
通讯作者：
WILLIAMS, BG
中科院分区：
文献类型：
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作者：
BRIGHTWELL, R;DRANSFIELD, RD;WILLIAMS, BG
监测了从河流灌丛到开阔平原的样带采采蝇（Glossina pallidipes Austen）和长尾蝇（G. longipennis Corti）分布的季节变化，以及采采蝇密度、气候因子、植被和寄主丰度的变化。采采蝇在开阔地区的扩散用平均扩散量来量化。在降雨期间和之后，这两个物种都将它们的分布范围扩展到离河流灌木丛至少3.5公里的开阔地区。长柄棘球绦虫的平均传播范围大于苍白棘球绦虫。雌雄蝇的分布非常相似，不同年龄的雌蝇的分布也非常相似，但在开阔地区的样本中，未产蝇和携带二龄幼虫的雌蝇的分布较少。这种季节性扩散可以用随机扩散来解释，其平均均方根位移约为每天175米。观测到的传播程度与采样前的湿度条件最相关，但多元回归模型表明，寄主丰度、植被归一化植被指数（Normalised Difference vegetation Indices， NDVI）和采采蝇密度也是影响传播程度的因素。讨论了这些发现在采采蝇控制方面的意义。
Seasonal changes in the distribution of the tsetse flies, Glossina pallidipes Austen and G. longipennis Corti, along a transect from riverine thickets out into open plains were monitored along with tsetse density, climatic factors, vegetation and host abundance. Dispersal of tsetse into open country was quantified using the mean spread. During and after the rains both species extended their distribution out into open country up to at least 3.5 km from riverine thicket areas. The mean spread of G. longipennis was greater than that of G. pallidipes. The spread of males and females was very similar, as was the spread of different age categories of parous females, but nulliparous flies and females carrying second instar larvae were under-represented in samples from open areas. This seasonal dispersal can be accounted for by random diffusion with an average root mean square displacement of about 175 m per day. Observed degrees of spread were best correlated with humidity conditions prior to sampling, but multiple regression models suggested that host abundance, vegetation as measured by Normalised Difference Vegetation Indices (NDVI), and, in the case of G. longipennis, tsetse density, were also factors in determining the degree of spread. The significance of these findings in relation to tsetse control is discussed.