To eat or get heat: Behavioral trade‐offs between thermoregulation and feeding in gregarious necrophagous larvae
To eat or get heat: Behavioral trade‐offs between thermoregulation and feeding in gregarious necrophagous larvae
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进食或获取热量：群居食尸幼虫的体温调节和摄食之间的行为权衡
DOI：
10.1111/1744-7917.12465
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发表时间：
2018
期刊：
影响因子：
4
通讯作者：
D. Charabidzé
中科院分区：
文献类型：
--
作者：
J. Podhorná;Cindy Aubernon;M. Borkovcová;Julien Boulay;V. Hédouin;D. Charabidzé
研究了以脊椎动物身体为食的尸食性物种丝光绿蝇幼虫的体温调节行为。这些幼虫需要高热量才能发育，并能通过形成大的聚集体来提高温度。我们推测，丝状乳杆菌幼虫应该继续在38摄氏度的温度下取食，这一温度可以在幼虫团内达到。热调节行为，如在食物热点和较冷区域之间的移动也是假设的。在含有1个食物斑点(FS)的培养皿中，将食物加热到25℃、34℃或38℃恒温，环境温度为25℃，跟踪1 h饥饿的3龄幼虫的活动，并测试了食物中先前的同种活性对幼虫行为的影响。对幼虫的作物进行解剖，以监测消化系统中的食物含量。根据相对作物测量，幼虫在所有食物温度下取食，但温度强烈影响幼虫的行为和运动学。在高温条件下，幼虫在FS中停留的总时间和每次停留的持续时间都有所减少。食物中同种异物的先前活动略微增加了幼虫在FS中所花费的时间，也减少了到FS的平均距离。因此，尸食性绢毛L.sericata幼虫在正常摄食活动中可能通过调节局部温度的波动来调节体温，特别是在蚯蚓团内。通过保持体内温度稳定，幼虫可能会缩短发育时间。
The thermoregulation behavior of Lucilia sericata larvae (Diptera: Calliphoridae), a necrophagous species that feeds on vertebrate cadavers, was investigated. These larvae require high heat incomes to develop, and can elevate temperatures by forming large aggregates. We hypothesized that L. sericata larvae should continue to feed at temperatures up to 38 °C, which can be reached inside larval masses. Thermal regulation behavior such as movement between a hot food spot and colder areas was also postulated. The hypotheses were tested by tracking for 1 h the activity of single, starved third instar larvae in a Petri dish containing 1 food spot (FS) that was heated to a constant temperature of 25 °C, 34 °C or 38 °C with an ambient temperature of 25 °C. The influence of previous conspecific activity in the food on larval behavior was also tested. The crops of larvae were dissected to monitor food content in the digestive systems. Based on relative crop measurements, larvae fed at all food temperatures, but temperature strongly affected larval behavior and kinematics. The total time spent by larvae in FS and the duration of each stay decreased at high FS temperature. Previous activity of conspecifics in the food slightly increased the time spent by larvae in FS and also decreased the average distance to FS. Therefore, necrophagous L. sericata larvae likely thermoregulate during normal feeding activities by adjusting to local fluctuations in temperature, particularly inside maggot masses. By maintaining a steady internal body temperature, larvae likely reduce their development time.