. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. DYNAMICS OF AGGREGATION 50 -i 265 0-19% 20-39% 40-59% 60-79% 80-100% % of ants in one chain over the total number of ants in both chains Figure 2. Distributions of the proportion of ants in one chain on the total number of ants in each chain at times 2 (D) and 20 min (•) (N = 19).. 0-19% 20-39% 40-59% 60-79% % of larvae in the right shelter 80-100% Figure 4. Experimental distribution of the proportion of cockroach larvae present in shelter 1 (n = 491. Number of larvae in each tested group = 20. single shelter only if the num
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. DYNAMICS OF AGGREGATION 50 -i 265 0-19% 20-39% 40-59% 60-79% 80-100% % of ants in one chain over the total number of ants in both chains Figure 2. Distributions of the proportion of ants in one chain on the total number of ants in each chain at times 2 (D) and 20 min (•) (N = 19).. 0-19% 20-39% 40-59% 60-79% % of larvae in the right shelter 80-100% Figure 4. Experimental distribution of the proportion of cockroach larvae present in shelter 1 (n = 491. Number of larvae in each tested group = 20. single shelter only if the number of shelters is small or its population is large. This result shows that different patterns of aggregation may be spontaneously adopted based only on changes in the environment. In natural situations, the shelters are not identical, and they are characterized by different parameters, which are more or less easily detected and integrated by an individual. Any parameter of the shelter that increases the individual resting time favors the formation of the cluster in this shelter. Because of the competition between shelters, most of the larvae will aggregate in the site that has the highest resting time. Furthermore, the interactions between individ- uals increase the probability of an individual staying on the site that produces the largest resting time and benefit per capita. Individual tests show that the larvae prefer the odor of their own strain to that of another (Rivault el ai. 1999). However, in mixed groups with individuals from two strains, experiments show that the final aggregation is not different for mixed or pure groups (Rivault and Cloarec, 1998). In simulations, it is rather easy to take these inter- actions between strains into account: 50 i i 40- 30- 20- 10-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble t
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
