首页 | 本学科首页   官方微博 | 高级检索  
   检索      


The role of odour and visual cues in the pan-trap catching of hoverflies (Diptera: Syrphidae)
Authors:EA Laubertie  SD Wratten  & JR Sedcole
Institution:National Centre for Advanced Bio-Protection Technologies, Lincoln University, Canterbury, New Zealand; Ecole Nationale de Formation Agronomique, UMR 5174 'Evolution et Diversitébiologique', Auzeville, France; Statistics Group, Agricultural Science and Production, Agriculture and Life Sciences Division, Lincoln University, Canterbury, New Zealand
Abstract:Coloured pan traps are frequently used to attract and catch insects, such as in the monitoring of populations of beneficial insects in classical or conservation biological control. They are also used in the evaluation of the recovery of insect populations after disturbance and in many other situations where an estimate of relative insect numbers is required. However, the fact that traps may be visible to the insects over a considerable distance can influence the interpretation of catch data. This difficulty may arise, for example, if traps along a transect can attract insects from some or all of the other transect positions. This study compared the effect of different coloured traps on attraction and catch of hoverflies. The hypothesis was that completely yellow traps would attract hoverflies from a distance, while traps that were green outside and yellow inside would catch fewer flies because only those from above or near the trap can see the yellow stimulus. A subsidiary hypothesis was that rose water would enhance hoverfly capture rates. For the two main hoverfly species captured, Melanostoma fasciatum (Macquart) and Melangyna novaezelandiae (Macquart), significantly more individuals were caught in completely yellow traps than in yellow and green or in completely green traps. Moreover, the addition of rose water increased the number of hoverflies caught significantly. It is suggested that if a measure of hoverfly numbers relating to a particular distance along a transect is required, consideration should be given to the ability of hoverflies to see yellow traps from a distance. The use of traps that are green outside would more accurately reflect the local abundance of hoverflies. If higher trap catches of hoverflies are needed for statistical purposes, rose water can enhance catches.
Keywords:Attraction  hoverflies              Melangyna novaezelandiae                        Melanostoma fasciatum            pan traps  rose water  rose water
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号