<abstract xmlns="http://www.w3.org/1999/xhtml">

<p>The Eastern Imperial Eagle (EIE) is a large-sized, globally threatened species with a wide distribution. The species is extremely vulnerable and sensitive to human disturbance and activities in the vicinities of its nests. We analyzed the effect of human disturbance in two territories of Eastern Imperial Eagles from Bulgaria in 2008–2009. We recorded 375 cases of different types of human activity in the vicinities of the two surveyed nests – 60 cases in nest A and 315 in nest B. The most common activity around the studied nests was the passing of light motor vehicles (n=100 cases). Our results highlight that the probability of EIE’s reaction is dependent on the type of activity, distance from the nest and the duration of the activity. However, eagles’ reaction is independent from the number of intruders. We found that with the decrease of the distance to the nest, the reaction progresses and is more acute. We found statistical differences between the distance belts and the majority of alert and flight reactions that were recorded at distances up to 300 m from the nests. We reported that humans walking around nests (mainly hunters, fishermen, tourists, people illegally extracting sand in the close vicinities of the nests) result in a large number of reactions of flight off by the eagles thus, leaving the nest unattended. More research on a large scale on this topic is needed including more accurate measures to address human disturbance in EIE territories. The findings will be applied to ensure higher breeding rates and species conservation.</p>
</abstract>

The Eastern Imperial Eagle (EIE) is a large-sized, globally threatened species with a wide distribution. The species is extremely vulnerable and sensitive to human disturbance and activities in the vicinities of its nests. We analyzed the effect of human disturbance in two territories of Eastern Imperial Eagles from Bulgaria in 2008–2009. We recorded 375 cases of different types of human activity in the vicinities of the two surveyed nests – 60 cases in nest A and 315 in nest B. The most common activity around the studied nests was the passing of light motor vehicles (n=100 cases). Our results highlight that the probability of EIE’s reaction is dependent on the type of activity, distance from the nest and the duration of the activity. However, eagles’ reaction is independent from the number of intruders. We found that with the decrease of the distance to the nest, the reaction progresses and is more acute. We found statistical differences between the distance belts and the majority of alert and flight reactions that were recorded at distances up to 300 m from the nests. We reported that humans walking around nests (mainly hunters, fishermen, tourists, people illegally extracting sand in the close vicinities of the nests) result in a large number of reactions of flight off by the eagles thus, leaving the nest unattended. More research on a large scale on this topic is needed including more accurate measures to address human disturbance in EIE territories. The findings will be applied to ensure higher breeding rates and species conservation.

Human activities can hinder the breeding of a top avian predator: preliminary results

Ornis Hungarica

This work is licensed under the Creative Commons Attribution 4.0 International License.

The Eastern Imperial Eagle (EIE) is a large-sized, globally threatened species with a wide distribution. The species is extremely vulnerable and sensitive to...

Human activities can hinder the breeding of a top avian predator: preliminary results

Publié en ligne: 29 nov. 2021

Pages: 71 - 80

Reçu: 19 mai 2021

Accepté: 12 oct. 2021

DOI: https://doi.org/10.2478/orhu-2021-0020

Mots clés
Eastern Imperial Eagle, Bulgaria, disturbance, breeding, alteration, population

© 2021 Dobromir Dobrev et al., published by Sciendo

This work is licensed under the Creative Commons Attribution 4.0 International License.

Human activities can hinder the breeding of a top avian predator: preliminary results

Publié en ligne: 29 nov. 2021

Pages: 71 - 80

Reçu: 19 mai 2021

Accepté: 12 oct. 2021

DOI: https://doi.org/10.2478/orhu-2021-0020

Mots clésEastern Imperial Eagle, Bulgaria, disturbance, breeding, alteration, population

© 2021 Dobromir Dobrev et al., published by Sciendo

This work is licensed under the Creative Commons Attribution 4.0 International License.

Mots clés
Eastern Imperial Eagle, Bulgaria, disturbance, breeding, alteration, population