FLYING MATE DETECTION AND CHASING BY TSETSE-FLIES (GLOSSINA)
FLYING MATE DETECTION AND CHASING BY TSETSE-FLIES (GLOSSINA)
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DOI：
10.1111/j.1365-3032.1991.tb00551.x
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发表时间：
1991-06-01
影响因子：
1.5
通讯作者：
BRADY, J
中科院分区：
文献类型：
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作者：
BRADY, J
雄性采采蝇可能是Glossina morsitans morsitans Westw.在它们起飞追逐其他采采蝇时被现场录像。 追逐者在最大距离c处回应（起飞）目标飞行。55厘米，当它对着C。1.6-度到他们的眼睛（全等-到1个小眼对侧）。 被追逐的目标总是在这个范围内（起飞时的平均对向角= 3.2 °），并且正在接近追逐者。 被追逐和未被追逐的目标之间最显著的差异是在追逐者起飞前立即增加其图像大小（xBAR 21度s-1），特别是其相对增加（xBAR 690% s-1，P < 0.005）的目标苍蝇的接近率。 目标的平移速度的特征，以及它与图像大小之间的任何关系，都没有达到这种显著性水平。 追逐者似乎在c处“滑流”了他们的目标。在它正后方20厘米处，也许暗示着通过速度匹配来识别目标。 当目标图像从覆盖至少两个追逐者的中央凹小眼缩小到只覆盖一个时，追逐显然被放弃了。 对飞行速度的无视差测量表明，在平均翼振频率为209 +/- 3 Hz时，优选的稳定平均对地速度为4.8 +/- 0.1 m s-1（SE）。
Male tsetse flies, probably Glossina morsitans morsitans Westw., were video-recorded in the field as they took off and chased other tsetse flies. Chasers responded (took off) to a target fly at a maximum distance of c. 55 cm, when it subtended c. 1.6-degrees to their eye (congruent-to 1 foveal ommatidial subtense). Chased targets were always within this range (mean subtense at take-off = 3.2-degrees) and approaching the chaser. The most significant difference between chased and non-chased targets was in the rate of approach of the target fly in terms of the increase in its image size immediately before the chaser took off (xBAR 21-degrees s-1), especially as its relative increase (xBAR 690% s-1, P < 0.005). No feature of the target's translational velocity, nor any relationship between that and the image size approached this level of significance. Chasers seemed to 'slipstream' their target at c. 20 cm directly behind it, perhaps suggesting target identification by speed matching. Chases were apparently abandoned when the target image shrank from covering at least two of the chaser's foveal ommatidia to covering only one. Parallax-free measurements of flight speeds indicated a preferred, stable mean groundspeed of 4.8 +/- 0.1 m s-1 (SE), at a mean wing-beat frequency of 209 +/- 3 Hz.