Abstract
Linear aggregation is present in some animals, such as the coordinated movement of ants and the migration of caterpillars and spinylobsters, but none has been reported on rotifers. The rotifers were collected and clone cultured in the laboratory at 25 ± 1°C, under natural light (light intensity ~130 lx, L:D = 14:10). The culture medium(pH = 7.3) was formulated as described by Suga et al., and rotifers were fed on the micro algae Scenedesmus obliquus grown in HB-4 medium to the exponential growth stage. When density was high (150 individuals ml-1), the behavior of rotifers was observed using a stereo microscope (Motic ES-18TZLED). In this paper, linear aggregation in Brachionus calyciflorus was found for the first time, and experiments were carried out to verify the correlation between linear aggregation and culture density of B. calyciflorus. With the increase of density, the number of aggregations increase, the number of individuals in the aggregation increased, and the maintenance time of the aggregation was also increased. Therefore, we speculate that the formation of aggregates is related to density and may be a behavioral signal of density increase, which may transmit information between density increase and formation of dormant eggs.
Highlights
Little research has been done on rotifer behavior
The results indicate that the formation of linear aggregations increases with an increase in the density of rotifers
The first linear aggregation formed at a density of 50 individuals 4 ml-1 in the first experiment, and at 16 individuals ml-1 in the second experiment
Summary
Little research has been done on rotifer behavior. Mating behavior of the rotifer was described: Epiphanes senta [1], Brachionus plicatilis [2] and Brachionus calyciflorus [3]. There is no report on the behavior of linear aggregation in rotifer. We are not aware of any other reports that rotifers, an asocial animal, form daisy chain-like associations. We report that rotifers form daisy chain-like associations, providing evidence that this organized social behavior is present among invertebrates living in the zooplankton.
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