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Norasmah Basari Benita C. Laird-Hopkins Ana B. Sendova-Franks Nigel R. Franks 《Die Naturwissenschaften》2014,101(7):549-556
Tandem running is a recruitment strategy whereby one ant leads a single naïve nest mate to a resource. While tandem running progresses towards the goal, the leader ant and the follower ant maintain contact mainly by tactile signals. In this paper, we investigated whether they also deposit chemical signals on the ground during tandem running. We filmed tandem-running ants and analysed the position of the gasters of leaders and followers. Our results show that leader ants are more likely to press their gasters down to the substrate compared to follower ants, single ants and transporter ants. Forward tandem-run leaders (those moving towards a new nest site) performed such trail-marking procedures three times more often than reverse tandem leaders (those moving towards an old nest site). That leader ants marked the trails more often during forward tandem runs may suggest that it is more important to maintain the bond with the follower ant on forward tandem runs than on reverse tandem runs. Marked trails on the ground may serve as a safety line that improves both the efficiency of tandem runs and their completion rates. 相似文献
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A regional climate change impact assessment was conducted which investigated the timing of the first appearance of furunculosis
caused by the bacterium, Aeromonas
salmonicida, in fish of the Ouje-Bougoumou region of northern Quebec, Canada. Historical data were used to assess whether there was a
temporal relationship between increased temperatures (observed climate data) and the appearance of furunculosis (traditional
environmental knowledge was used to provide context). To project future impacts of climate change, climate models and lake
models were used. Regression analysis revealed a significant, positive temporal trend in mean air temperature. The temperature
range conducive to A. salmoncida survival coincided with the first appearance of furunculosis. In addition, it is predicted that lake temperatures will remain
suitable for the presence of A. salmonicida into the future; it is likely that the disease will persist throughout the twenty-first century. Climate change appears to
be a factor explaining the onset of furunculosis; however, other factors/stressors cannot be discounted, such as, the effects
past mining activities near the lakes of the Ouje-Bougoumou region have had on the body burden of contaminants in the fish
(and the potential effects on the fish immune system). 相似文献
3.
Hori Yukari Gough William A. Tam Benita Tsuji Leonard J. S. 《Regional Environmental Change》2018,18(6):1753-1763
Regional Environmental Change - A network of winter roads that consists of snow-ice roads over land, muskeg, and frozen lakes and rivers has been and continues to be a critical seasonal lifeline in... 相似文献
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