The Social Behavior of Brown Bears at McNeil River, Alaska
The social behavior of brown bears (Ursus arctos) was studied during the summers of 1972 and 1973 as bears fished for salmon at McNeil River, Alaska. Study objectives were to determine behavioral characteristics of bears in relation to sex and age, changes in social behavior over a 40-day long fishi...
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ftutahsudc:oai:digitalcommons.usu.edu:etd-3104 2023-07-30T04:07:24+02:00 The Social Behavior of Brown Bears at McNeil River, Alaska Egbert, Allan L. 1978-05-01T07:00:00Z application/pdf https://digitalcommons.usu.edu/etd/2101 https://doi.org/10.26076/2055-8a45 https://digitalcommons.usu.edu/context/etd/article/3104/viewcontent/Egbert_Dissertation.pdf unknown DigitalCommons@USU https://digitalcommons.usu.edu/etd/2101 doi:10.26076/2055-8a45 https://digitalcommons.usu.edu/context/etd/article/3104/viewcontent/Egbert_Dissertation.pdf Copyright for this work is held by the author. Transmission or reproduction of materials protected by copyright beyond that allowed by fair use requires the written permission of the copyright owners. Works not in the public domain cannot be commercially exploited without permission of the copyright owner. Responsibility for any use rests exclusively with the user. For more information contact digitalcommons@usu.edu. All Graduate Theses and Dissertations brown bears McNeil River Alaska behavior Behavior and Ethology Other Animal Sciences text 1978 ftutahsudc https://doi.org/10.26076/2055-8a45 2023-07-20T17:35:07Z The social behavior of brown bears (Ursus arctos) was studied during the summers of 1972 and 1973 as bears fished for salmon at McNeil River, Alaska. Study objectives were to determine behavioral characteristics of bears in relation to sex and age, changes in social behavior over a 40-day long fishing season, social and environmental parameters correlated with the occurrence of behavior, and to test the hypothesis that brown bears modify social behavior in a feeding aggregation to exploit a resource limited in time and space. Over one-half of the agonistic interactions consisted of passive deferrals. Encounters that included elements of overt threat were jawing, sparring, charges, and fighting. Jawing was the most prevalent agonistic encounter and generally occurred between individuals of the same sex and age class. Sparring, charges and fights were generally initiated by larger bears against smaller individuals. Females with young were most intolerant. Adult males participated in few encounters that involved overt threat since most bears avoided them. Single adult and adolescent females were neither particularly aggressive nor especially tolerant. Adolescent males adjusted quickly to McNeil Falls and as a group were unaggressive. Subadults were wary and frequently were the objects of aggression of older bears. Social dominance relationships between bears of the same class were often ambiguous, the exception being adult males. Relationships between bears of different classes were mostly stable; adult males were dominant, followed in order by females with young, single adult females, adolescents, and subadults. However, apparent reversals also were common between single adult females and adolescent males. Nonagonistic encounters occurred only when salmon were exceptionally abundant and usually involved adolescent and subadult bears. Behavioral changes over time included a decline in the frequency of running deferrals, a decline in deferrals in total, and a decline in the frequency of charges. The occurrence of ... Text Ursus arctos Alaska Utah State University: DigitalCommons@USU |
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Utah State University: DigitalCommons@USU |
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ftutahsudc |
language |
unknown |
topic |
brown bears McNeil River Alaska behavior Behavior and Ethology Other Animal Sciences |
spellingShingle |
brown bears McNeil River Alaska behavior Behavior and Ethology Other Animal Sciences Egbert, Allan L. The Social Behavior of Brown Bears at McNeil River, Alaska |
topic_facet |
brown bears McNeil River Alaska behavior Behavior and Ethology Other Animal Sciences |
description |
The social behavior of brown bears (Ursus arctos) was studied during the summers of 1972 and 1973 as bears fished for salmon at McNeil River, Alaska. Study objectives were to determine behavioral characteristics of bears in relation to sex and age, changes in social behavior over a 40-day long fishing season, social and environmental parameters correlated with the occurrence of behavior, and to test the hypothesis that brown bears modify social behavior in a feeding aggregation to exploit a resource limited in time and space. Over one-half of the agonistic interactions consisted of passive deferrals. Encounters that included elements of overt threat were jawing, sparring, charges, and fighting. Jawing was the most prevalent agonistic encounter and generally occurred between individuals of the same sex and age class. Sparring, charges and fights were generally initiated by larger bears against smaller individuals. Females with young were most intolerant. Adult males participated in few encounters that involved overt threat since most bears avoided them. Single adult and adolescent females were neither particularly aggressive nor especially tolerant. Adolescent males adjusted quickly to McNeil Falls and as a group were unaggressive. Subadults were wary and frequently were the objects of aggression of older bears. Social dominance relationships between bears of the same class were often ambiguous, the exception being adult males. Relationships between bears of different classes were mostly stable; adult males were dominant, followed in order by females with young, single adult females, adolescents, and subadults. However, apparent reversals also were common between single adult females and adolescent males. Nonagonistic encounters occurred only when salmon were exceptionally abundant and usually involved adolescent and subadult bears. Behavioral changes over time included a decline in the frequency of running deferrals, a decline in deferrals in total, and a decline in the frequency of charges. The occurrence of ... |
format |
Text |
author |
Egbert, Allan L. |
author_facet |
Egbert, Allan L. |
author_sort |
Egbert, Allan L. |
title |
The Social Behavior of Brown Bears at McNeil River, Alaska |
title_short |
The Social Behavior of Brown Bears at McNeil River, Alaska |
title_full |
The Social Behavior of Brown Bears at McNeil River, Alaska |
title_fullStr |
The Social Behavior of Brown Bears at McNeil River, Alaska |
title_full_unstemmed |
The Social Behavior of Brown Bears at McNeil River, Alaska |
title_sort |
social behavior of brown bears at mcneil river, alaska |
publisher |
DigitalCommons@USU |
publishDate |
1978 |
url |
https://digitalcommons.usu.edu/etd/2101 https://doi.org/10.26076/2055-8a45 https://digitalcommons.usu.edu/context/etd/article/3104/viewcontent/Egbert_Dissertation.pdf |
genre |
Ursus arctos Alaska |
genre_facet |
Ursus arctos Alaska |
op_source |
All Graduate Theses and Dissertations |
op_relation |
https://digitalcommons.usu.edu/etd/2101 doi:10.26076/2055-8a45 https://digitalcommons.usu.edu/context/etd/article/3104/viewcontent/Egbert_Dissertation.pdf |
op_rights |
Copyright for this work is held by the author. Transmission or reproduction of materials protected by copyright beyond that allowed by fair use requires the written permission of the copyright owners. Works not in the public domain cannot be commercially exploited without permission of the copyright owner. Responsibility for any use rests exclusively with the user. For more information contact digitalcommons@usu.edu. |
op_doi |
https://doi.org/10.26076/2055-8a45 |
_version_ |
1772820689734074368 |