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Date Permissions Signed
3-18-2011
Date of Award
2011
Document Type
Masters Thesis
Degree Name
Master of Science (MS)
Department
Environmental Sciences
First Advisor
Helfield, James M.
Second Advisor
Bodensteiner, Leo R., 1957-
Third Advisor
Bunn, Andrew Godard
Fourth Advisor
Quinn, Thomas
Abstract
Previous research on the fishing behavior of bears (Ursus spp.) along salmon streams suggests that dominant individuals forage more efficiently than their competitors; specifically, large adult males are the most efficient foragers at a given stream due to their ability to dominate the most productive locations. I tested this hypothesis by observing 26 individual brown bears (U. arctos) fishing for chum salmon (Oncorhynchus keta) at McNeil River, Alaska, over 33 days during the summer of 2010. In contrast with previous findings I did not observe strong relationships between the foraging efficiency of individual bears and the frequency with which they engaged in dominance-related behaviors (e.g., displacing competitors, stealing fish, using more productive locations). While some individuals seemed to employ dominance as a strategy to achieve high catch rates, other individuals achieved high foraging efficiency by employing alternative foraging strategies that did not involve dominance-related behaviors. My observations suggest that bears at McNeil River employ a variety of fishing strategies, of which dominance-related behavior is but one alternative. I suggest that where foraging efficiency is concerned, an individual bear's ability to develop an effective foraging strategy may be more important than its social dominance. My findings open the door to intriguing questions for future research into which physical or cognitive traits lead to the development of successful foraging strategies among brown bears fishing for salmon.
Type
Text
DOI
https://doi.org/10.25710/pfbz-ne70
Publisher
Western Washington University
OCLC Number
727948404
Subject – LCSH
Brown bear--Behavior--Alaska--McNeil River State Game Sanctuary; Brown bear--Food--Alaska--McNeil River State Game Sanctuary; Chum salmon--Predators of--Alaska--McNeil River State Sanctuary
Geographic Coverage
McNeil River State Game Sanctuary (Alaska)
Format
application/pdf
Genre/Form
masters theses
Language
English
Rights
Copying of this document in whole or in part is allowable only for scholarly purposes. It is understood, however, that any copying or publication of this thesis for commercial purposes, or for financial gain, shall not be allowed without the author's written permission.
Recommended Citation
Gill, Ian D. (Ian David), "Alternative foraging strategies among brown bears (Ursus arctos) fishing for chum salmon (Oncorhynchus keta) at McNeil River, Alaska" (2011). WWU Graduate School Collection. 106.
https://cedar.wwu.edu/wwuet/106