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Predators' effect on activity


Setup 1

The activity decreased significantly for the stonewort ecotype when chemical cues from damselfly larva was added (paired t-test: t = 2.42, p = 0.039) (Fig 1). No other changes in activity could be detected.

No difference in activity could be detected for neither the ecotypes nor the predator cues.

Fig 1. The activity during 5 min before and after the addition of chemical cues from either damselfly or perch in Setup 1. ( n = 10 for all treatments, * denotes p<0.05 tested with paired t-test). Error bars show standard deviation.

Setup 2: The gradient setup

No significant change in activity could be detected with a two samle t-test in any of the treatments after the predator cues were added (Fig 2). Neither could any significant effect of the ecotype nor the predator be detected with a two-way ANOVA.

Fig 2. The activity during 5 min before and after the addition of chemical cues from either damselfly or perch in Setup 2 with a gradient of cues. No significant change in activity could be detected ( n = 10 for all treatments). Error bars show standard deviation.


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Last updated: 06/02/11