Division of Organisms and the Environment, Department of Environmental Science, Policy, and Management, College of Natural Resources, University of California/Berkeley, 1301 South 46th Street, Building 478, Richmond, CA 94804-4698, USA.
J Econ Entomol. 2013 Feb;106(1):338-46. doi: 10.1603/ec12050.
Acoustic emission (AE) activity patterns were measured from seven loquat [Eriobotrya japonica (Thunb.) Lindl.] logs, five containing live western drywood termite [Incisitermes minor (Hagen)] infestations, and two without an active drywood termite infestation. AE activity, as well as temperature, were monitored every 3 min under unrestricted ambient conditions in a small wooden building, under unrestricted ambient conditions but in constant darkness, or in a temperature-controlled cabined under constant darkness. Logs with active drywood termite infestations displayed similar diurnal cycles of AE activity that closely followed temperature with a peak of AE activity late in the afternoon (1700-1800 hours). When light was excluded from the building, a circadian pattern continued and apparently was driven by temperature. When the seven logs were kept at a relatively constant temperature (approximately 23 +/- 0.9 degrees C) and constant darkness, the pattern of activity was closely correlated with temperature, even with minimal changes in temperature. Temperature is the primary driver of activity of these drywood termites, but the effects are different when temperature is increasing or decreasing. At constant temperature, AE activity was highly correlated with the number of termites in the logs. The possible implications of these findings on our understanding of drywood termite biology and how this information may affect inspections and posttreatment evaluations are discussed.
声发射（AE）活动模式从七个枇杷[Eriobotrya japonica（Thunb.）Lindl.]原木中进行了测量，其中五个原木中有活的西部干木白蚁[Incisitermes minor（Hagen）]侵扰，两个原木没有活跃的干木白蚁侵扰。在一个小木屋中，在不受限制的环境条件下，每 3 分钟监测一次 AE 活动以及温度；在不受限制的环境条件下，但在恒定的黑暗中，或在温度控制的小木屋中，在恒定的黑暗中进行监测。有活跃的干木白蚁侵扰的原木显示出类似的 AE 活动昼夜节律，与温度密切相关，AE 活动的高峰期在下午晚些时候（1700-1800 小时）。当建筑物内没有光线时，昼夜节律继续存在，显然是由温度驱动的。当这七个原木保持在相对恒定的温度（约 23 +/- 0.9 摄氏度）和恒定的黑暗中时，即使温度发生微小变化，活动模式也与温度密切相关。温度是这些干木白蚁活动的主要驱动因素，但当温度升高或降低时，其影响是不同的。在恒定温度下，AE 活动与原木中白蚁的数量高度相关。讨论了这些发现对我们理解干木白蚁生物学的可能影响，以及这些信息如何影响检查和治疗后评估。
