Fig. 7
Overview of changes in the prevalence of previously dominant trematode species found in 2000 or earlier as compared to the period 2011–2020. The prevalence in the two respective time periods and the decline in prevalence of the respective dominant species are indicated. The prevalence is shown as a percent of infected hosts, with the color green assigned to the highest prevalence of the respective trematode species and white assigned to zero prevalence. All the observed declines in prevalence were found to be significant (χ2 test P < 0.001 each); the declines in trematodes of V. vanellus were not tested. Using the same logic, the figure shows the intensity of infection by the previously dominant trematode species in the two respective time periods and the change in the intensity of infection of the respective dominant species. The color code used follows similar logic as that for the prevalence. All the observed changes in the intensity of infection were tested by the Mann–Whitney rank-sum test, which revealed that only the differences in the intensity of infection by Lyperosomum petiolatum and Strigea strigis were significant (P < 0.05 each); the changes in the intensity of infection in V. vanellus were not tested