engleski

Testing the effect of persecution and permanent dispersion of sub-adult birds in long-term sustainability of white tailed eagles (Haliaeetus albicilla L.) population at different management options in Croatia

According to known population parameters, we used software Vortex for simulating long-term population dynamics of white tailed eagles (Haliaeetus albicilla L.) on fourteen management options. The main purpose of the study was the assessment of the dispersion rate detection importance (integrating effects of persecution and permanent dispersion) for the long-term viability of the population. None of the fourteen management scenarios led the population to extinction (P(E)<0.00). Basic scenario, the one that represents the present knowledge about the population in Croatia, was determined with deterministic (rdet) and stochastic growth rates rstoch of 0.074 and 0.072 respectively. All the scenarios with assumed dispersion rate of five sub-adult pairs had significantly lower deterministic and stochastic growth rates. Four of them, all characterised with degraded conditions for both breeding and non-breeding parts of the population, resulted in negative stochastic growth rates and led the population to extinction with probabilities ranged from rstoch -0.05 – -0.093. According to the obtained results we gave recommendations for future monitoring program improvements focusing the field work on dispersion rate detection as well as on the non-breeding part of the population in general.

population; viability; eagle; sustainability; management

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