From where are insects recruited? A new model to interpret catches of attractive traps
(2003) In Agricultural and Forest Entomology 5(2). p.163171 Abstract
 1 Two new concepts describing the origin of insects caught ill an attractive trap are presented. 2 Male European pine sawflies Neodiprion sertifer Geoffroy (Hymenoptera: Diprionidae) were marked and released from 50, 100, 200, 400 and 800 m in the four cardinal directions around a centrally placed pheromone trap. 3 Based on linear regression of transformed data, we calculated the seasonal sampling range (r(s)) as 1040 m. 4 We estimated the previously defined 'effective sampling area' (alpha) at 4.9 ha, assuming that the insects are evenly distributed around the trap and that they are attracted from a circular area around it. This is the area from which all insects originate if the trap is 100% effective within the area but captures nothing... (More)
 1 Two new concepts describing the origin of insects caught ill an attractive trap are presented. 2 Male European pine sawflies Neodiprion sertifer Geoffroy (Hymenoptera: Diprionidae) were marked and released from 50, 100, 200, 400 and 800 m in the four cardinal directions around a centrally placed pheromone trap. 3 Based on linear regression of transformed data, we calculated the seasonal sampling range (r(s)) as 1040 m. 4 We estimated the previously defined 'effective sampling area' (alpha) at 4.9 ha, assuming that the insects are evenly distributed around the trap and that they are attracted from a circular area around it. This is the area from which all insects originate if the trap is 100% effective within the area but captures nothing outside of it. The effective sampling area reveals nothing about the origin of the insects caught. We defined the Cumulative Proportional Catch (CPC) that gives the proportion of the trap catch that originates from an area within a distance r from the trap. At r = r(s) CPC = 1, and in our study 50% of the captured insects originated up to 450 m from the trap. Thus, for the trap used in this study, a relatively large proportion of the catch originates some distance from the trap. 5 We also defined the Catch Concentration (CC), which is the ratio of the radius of the effective sampling area (r(alpha)) to r(s). For our data, CC = 0.12, which is intermediate to high compared to the few other studies that we have extracted information from. If r(alpha) is considerably lower than r(s), then only a small proportion of the insects caught originate from close proximity to the trap. When r(alpha) is close to r(s), the catch adequately mirrors the population within most of its sampling range. 6 By using these two new concepts, we will better understand why monitoring traps mirror the local population in some cases but not in others. This will help in designing more reliable monitoring programmes. (Less)
Please use this url to cite or link to this publication:
http://lup.lub.lu.se/record/135929
 author
 Östrand, Fredrik ^{LU} and Anderbrant, Olle ^{LU}
 organization
 publishing date
 2003
 type
 Contribution to journal
 publication status
 published
 subject
 in
 Agricultural and Forest Entomology
 volume
 5
 issue
 2
 pages
 163  171
 publisher
 WileyBlackwell
 external identifiers

 wos:000183253200009
 scopus:0038356886
 ISSN
 14619555
 DOI
 project
 Chemical communication in sawflies
 language
 English
 LU publication?
 yes
 id
 b04d83ffa98b4eb483a1a435aefd2f20 (old id 135929)
 date added to LUP
 20070627 15:41:23
 date last changed
 20180529 11:41:43
@article{b04d83ffa98b4eb483a1a435aefd2f20, abstract = {1 Two new concepts describing the origin of insects caught ill an attractive trap are presented. 2 Male European pine sawflies Neodiprion sertifer Geoffroy (Hymenoptera: Diprionidae) were marked and released from 50, 100, 200, 400 and 800 m in the four cardinal directions around a centrally placed pheromone trap. 3 Based on linear regression of transformed data, we calculated the seasonal sampling range (r(s)) as 1040 m. 4 We estimated the previously defined 'effective sampling area' (alpha) at 4.9 ha, assuming that the insects are evenly distributed around the trap and that they are attracted from a circular area around it. This is the area from which all insects originate if the trap is 100% effective within the area but captures nothing outside of it. The effective sampling area reveals nothing about the origin of the insects caught. We defined the Cumulative Proportional Catch (CPC) that gives the proportion of the trap catch that originates from an area within a distance r from the trap. At r = r(s) CPC = 1, and in our study 50% of the captured insects originated up to 450 m from the trap. Thus, for the trap used in this study, a relatively large proportion of the catch originates some distance from the trap. 5 We also defined the Catch Concentration (CC), which is the ratio of the radius of the effective sampling area (r(alpha)) to r(s). For our data, CC = 0.12, which is intermediate to high compared to the few other studies that we have extracted information from. If r(alpha) is considerably lower than r(s), then only a small proportion of the insects caught originate from close proximity to the trap. When r(alpha) is close to r(s), the catch adequately mirrors the population within most of its sampling range. 6 By using these two new concepts, we will better understand why monitoring traps mirror the local population in some cases but not in others. This will help in designing more reliable monitoring programmes.}, author = {Östrand, Fredrik and Anderbrant, Olle}, issn = {14619555}, language = {eng}, number = {2}, pages = {163171}, publisher = {WileyBlackwell}, series = {Agricultural and Forest Entomology}, title = {From where are insects recruited? A new model to interpret catches of attractive traps}, url = {http://dx.doi.org/}, volume = {5}, year = {2003}, }