Wintle Kenneth, Reinhardt Klaus
Department of Animal and Plant Sciences, The University of Sheffield, Western Bank, Sheffield S10 2TN, United Kingdom.
J Insect Physiol. 2008 Jul;54(7):1200-4. doi: 10.1016/j.jinsphys.2008.05.005. Epub 2008 Jun 28.
Abdominal distension of haematophagous insects caused by ingested blood has been recognised as an important contributor to triggering meal termination, feeding inhibition and further susceptibility to host signals. Factors that regulate feeding behaviour of the common bedbug, Cimex lectularius, are poorly understood. By injecting air directly into the body cavity of virgin female C. lectularius we artificially induced abdominal distension without providing chemical cues of the blood meal and without applying gut distension. Body length increased to 138% after feeding and 147% after inflation. The early decline in body volume is similar in blood-fed bugs but after between 8 and 24h became faster in inflated than fed bedbugs. Artificially inflated individuals remained feeding-inhibited at lower abdominal distensions than those that terminate blood ingestion (to ca. 135% initial body length, or up to about 5h). Feeding activity resumed earlier in inflated than blood-fed bugs. These results suggest that artificial abdominal distension has an inhibitory effect on feeding but is not the sole mechanism in preventing further feeding.
摄食血液导致吸血昆虫腹部膨胀，这已被认为是引发进食终止、进食抑制以及对宿主信号进一步易感性的重要因素。人们对普通臭虫（温带臭虫）进食行为的调节因素了解甚少。通过将空气直接注入未交配雌性温带臭虫的体腔，我们在不提供血餐化学信号且不引起肠道扩张的情况下人为诱导腹部膨胀。进食后体长增加到138%，充气后增加到147%。饱血臭虫的身体体积早期下降情况类似，但在8至24小时后，充气臭虫的下降速度比饱血臭虫更快。与终止摄血的臭虫相比（达到初始体长的约135%，或长达约5小时），人工充气的个体在腹部膨胀程度较低时就保持进食抑制。充气臭虫比饱血臭虫更早恢复进食活动。这些结果表明，人工腹部膨胀对进食有抑制作用，但不是防止进一步进食的唯一机制。
