The major component of the mandibular gland secretion of queen honeybees (Apis mellifera L.), 9-ODA ((2E)-9-oxodecenoic acid), has been known for more than 40 yr to function as a long-range sex pheromone, attracting drones at congregation areas and drone flyways. Tests of other mandibular gland components failed to demonstrate attraction. It remained unclear whether these components served any function in mating behavior. We performed dual-choice experiments, using a rotating drone carousel, to test the attractiveness of 9-ODA compared to mixtures of 9-ODA with three other most abundant components in virgin queen mandibular gland secretions: (2E)-9-hydroxydecenoic acid (9-HDA), (2E)-10-hydroxydecenoic acid (10-HDA), and p-hydroxybenzoate (HOB). We found no differences in the number of drones attracted to 9-ODA or the respective mixtures over a distance. However, adding 9-HDA and 10-HDA, or 9-HDA, 10-HDA, and HOB to 9-ODA increased the number of drones making contact with the baited dummy. On the basis of these results, we suggest that at least 9-HDA and 10-HDA are additional components of the sex pheromone blend of A. mellifera.
This paper analyses the effect of training participation on employees' retention in the training company. It for the first time empirically combines the human capital and the monopsony theory by jointly controlling for the portability, visibility, and credibility of training. Based on an extensive German linked-employer-employee data set with detailed information on training history (WeLL-ADIAB), we show that training increases employees' retention. We compare the probability to stay at the same employer between training participants and accidental training non-participants (those who could not participate in planned training on the basis of exogeneous reasons). Higher portability of general human capital contents and visibility of training induced by training certificates however reduce the retention effect of training. Retention is further reduced when training is credibly provided and certified by external institutions, the full training effect on retention is still positive, however. We are careful to control for endogeneity of training participation in retention equations, unobserved time-invariant effects, and extensive individual and employer characteristics including wage increases and general job satisfaction.
This paper analyses the effect of training participation on employees' retention in the training company. It for the first time empirically combines the human capital and the monopsony theory by jointly controlling for the portability, visibility, and credibility of training. Based on an extensive German linked-employer-employee data set with detailed information on training history (WeLL-ADIAB), we show that training increases employees' retention. We compare the probability to stay at the same employer between training participants and accidental training non-participants (those who could not participate in planned training on the basis of exogeneous reasons). Higher portability of general human capital contents and visibility of training induced by training certificates however reduce the retention effect of training. Retention is further reduced when training is credibly provided and certified by external institutions, the full training effect on retention is still positive, however. We are careful to control for endogeneity of training participation in retention equations, unobserved time-invariant effects, and extensive individual and employer characteristics including wage increases and general job satisfaction.
Standard-Nutzungsbedingungen:Die Dokumente auf EconStor dürfen zu eigenen wissenschaftlichen Zwecken und zum Privatgebrauch gespeichert und kopiert werden.Sie dürfen die Dokumente nicht für öffentliche oder kommerzielle Zwecke vervielfältigen, öffentlich ausstellen, öffentlich zugänglich machen, vertreiben oder anderweitig nutzen.Sofern die Verfasser die Dokumente unter Open-Content-Lizenzen (insbesondere CC-Lizenzen) zur Verfügung gestellt haben sollten, gelten abweichend von diesen Nutzungsbedingungen die in der dort genannten Lizenz gewährten Nutzungsrechte. http://ftp.zew.de/pub/zew-docs/dp/dp18037.pdf Die Dis cus si on Pape rs die nen einer mög lichst schnel len Ver brei tung von neue ren For schungs arbei ten des ZEW. Die Bei trä ge lie gen in allei ni ger Ver ant wor tung der Auto ren und stel len nicht not wen di ger wei se die Mei nung des ZEW dar. Terms of use: Documents inDis cus si on Papers are inten ded to make results of ZEW research prompt ly avai la ble to other eco no mists in order to encou ra ge dis cus si on and sug gesti ons for revi si ons. The aut hors are sole ly respon si ble for the con tents which do not neces sa ri ly repre sent the opi ni on of the ZEW. 1 TRAINING IN THE GREAT RECESSION -EVIDENCE FROM AN INDIVIDUAL PERSPECTIVE
This paper analyses the effect of the economic crisis in 2008 and 2009 on individual training activities of different employee groups within establishments. We use a unique German linked employer-employee panel data set with detailed information on individual training history (WeLL-ADIAB). The so-called Great Recession can be seen as an exogenous, unexpected, and time-limited shock. Therefore, our quasi-experimental setting using Diff-in-Diff analyses reveals the causal impact of the crisis on the training participation and the number of training measures. We find a direct negative effect of the crisis on individual training activities in 2009 and 2010. The negative effect therefore sets in with a time lag and lasts until after the recession. Furthermore, the recession effect is stronger for employees in unskilled jobs than for employees in skilled jobs. JEL-Classification: M53, O16
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