# Results

### Cafeteria Experiment

On average all the predator species consumed consistently more mosquito larvae than the other prey types. Least preferred were the isopods.The Kruskal-Wallis test showed that the predators consumed significantly different amounts of the prey types (H = 8.35-15.20 and p≤0.05). However, when making pairwise comparisons the only significant difference was that *Rhantus frontalis* consumed more mosquito larvae than isopods (p≤0.05, q = 3.88). The number of *Acilius canaliculatus* was so low (four specimens) that statistical analyses could not be made for that species.

cell 1 | cell 2 |

cell 3 | cell 4 |

The bar graph above shows that there were high standard deviations in the predators' consumption of prey. *Notonecta glauca* and* A. canaliculatus* consumed more mosquito larvae than the *Rhantus *species (see the bar graph). *Rhantus exsoletus* and *N. glauca* consumed more isopods than the other predators. Between the *R.* *exsoletus* and *R. frontalis* this difference was significant (p≤0,01).

### Immigration Experiment

Only *R. exsoletus* and *R. frontalis* immigrated into the puddles (see table below). Most of them immigrated into the large ones but all the puddles were immigrated into by at least one *R. exsoletus *or* R. frontalis* in total during the time I trapped predators. The differences in number of immigrated beetles between large and small puddles were significant (p=0.0045 for R. frontalis and p= 0.0008 for R. exsoletus). There was no trend in how many female or male beetles which had immigrated to the puddles.

**The number of beetles which immigrated into the puddles**

Responsible for this page:
Agneta Johansson

Last updated:
05/29/13