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Characteristics of inter-individual relationship (friend vs. rival) in red deer and its effect on agonistic behavior and endocrinological feedback
Peterka, Tomáš
;
Bartoš, Luděk
(advisor) ;
Fuchs, Roman
(referee)
Red deer males aggregate for a major part of a year to bachelor groups. Social position - Rank - is unstable in these groups. Previous experiments revealed that rank modulated by agonistic behaviour influences antler growth and antler cycle timing. Antlers are secondary sexual characteristics of the deer family and one of the fastest growing tissue in the vertebrate taxa. Their development is modulated by androgenic hormone, testosterone. In our experiment, we observed agonistic behaviour of 19 males. They were equipped with GPS collars and regularly handled for blood samples and downloading of telemetrical data. Based on statistical analysis, we found that in our bachelor group 13 stags kept similar interindividual distances which did not exceed 22 metres ("Closest associates"), whereas the rest of the group moved tens of metres away ("Wanderers"). In regard to the number of agonistic interactions and the interindividual relationship, which arose from that, we divided the bachelor group on "Friends" (˂9 interactions) and "Rivals" (≥9). We found that the number of interactions depended on average distance among males in groups divided by dyadic relationship ("Friends" and "Rivals"). With increasing distance, "Rivals" increased the number of interactions, while "Friends" did not show this trend....
Detailed record
Characteristics of inter-individual relationship (friend vs. rival) in red deer and its effect on agonistic behavior and endocrinological feedback
Peterka, Tomáš
;
Bartoš, Luděk
(advisor) ;
Fuchs, Roman
(referee)
Red deer males aggregate during the period of antler growth to bachelor groups. Social position - Rank - is unstable in these groups. Previous experiments revealed that rank modulated by agonistic behaviour influence the antler growth and antler cycle timing. Antlers are the secondary sexual characteristics of the deer family and one of the fastest growing tissue in vertebrate taxa. Their development is modulated by androgenic hormone, testosterone. In our experiment, we observed agonistic behaviour of 19 males. They were equipped with GPS collar and observation lasted for two hours in the evening an in the morning, once or twice a week from the end of May to the end of August. Deer were handled regularly for blood samples and downloading the telemetrical data from collars. Base on a statistical analysis we found that in our bachelor group 13 stags kept similar interindividual distances which did not exceed the 22 metres level. These stags - the closest associates - differed in the sum of agonistic interactions. Those who reached 8 or less interactions were called Friends, while subgroup of the others reaching much more interactions were classified as Rivals. We found that number of interactions depended on average distance among males in groups (Friends and Rivals). Rivals with increasing distance...
Detailed record
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