Historicity as a factor of determining locations of heronries and winter roosts of Ardeidae species

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Aerial and ground census revealed population dynamics of heronries that consist of six Ardeidae species. There was no significant changes in species compositions and endangered Egretta intermedia dominated in the study area.The number of small colonies often occupied only by Ardea cineria had increased recent years. Competition for common resources generated intra-specific but inter-colonial variation in food preferences among Ardeidae species. Relatively small human perturbations by cutting trees of heronries rather than large perturbations, such as the TX development, affected continuity of heronries, and they tended to be reconstructed next year when there were relatively large winter roosts nearby the location.