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• 1931. [Article] A comparison of social class differences in adolescents' self-disclosure, parent-cathexis and self-cathexis

  The purpose of this study was to investigate the differences between middle- and lower-class adolescents and the extent of their self-disclosure to their mothers and their fathers; and their feelings both ...

  Citation × Citation Citation Abstract Copy Title: A comparison of social class differences in adolescents' self-disclosure, parent-cathexis and self-cathexis Author: Larsen, George Robert The purpose of this study was to investigate the differences between middle- and lower-class adolescents and the extent of their self-disclosure to their mothers and their fathers; and their feelings both positive and negative toward their parents and themselves. The subjects consisted of 50 middle-class and 50 lower-class adolescents who were randomly selected from 297 sophomores and juniors attending the same high school in a rural town in Oregon. Hollingshead's Index of Social Position (1958), which uses the occupation and education of the father as criteria for social class, was used to classify the adolescents by social class. Sex comparisons were also analyzed for differences between the middle- and lower-class adolescents. In attempting to realize this purpose, two major hypotheses were tested: Hypothesis 1: There are no differences between these middle-class and lower-class adolescents in the extent of self-disclosure to their parents. Hypothesis 2: There are no differences between these middle-class and lower-class adolescent's in the extent of positive and negative feelings toward their parents and themselves. The extent of self-disclosure was measured by Jourard's Self-disclosure Questionnaire (1964). This 60 item instrument which permits the subjects to indicate the extent to which they are willing to talk to another person about themselves on the following six categories: A attitudes and opinions, B tastes and interests, C work or studies, D money, E personality, and F body. Total scores from the questionnaire were used in testing Hypothesis 1. The results indicated that the null hypothesis could not be rejected. Comparison of middle- and lower-class males and middle- and lower-class females also did not indicate any significant differences on total scores from the Self-disclosure Questionnaire. The extent of the adolescents' positive and negative feelings toward their parents and themselves was measured by the use of Jourard's Cathexis Questionnaire. This instrument consists of 40 personality traits such as: sense of humor, philosophy of life, temper, and happiness. Total scores from the questionnaire were used in the test of Hypothesis 2. Once again, the results of the test indicated that the null hypothesis could not be rejected. In addition analysis was made of differences between middle- and lower-class males and middle- and lower-class females on total scores from the Cathexis Questionnaire for mothers, fathers and themselves. No significant differences were found for the social class differences for the middle- and lower-class males and females. The items within each questionnaire were then analyzed for significant differences between the middle- and lower-class adolescents. To test for significant differences between social classes for each item within the questionnaires, Chi Square and the Kolmogrov- Smirnov Test were used. Sixteen of the 60 items on the Self-disclosure Questionnaire were found to be significantly different between the middle- and lower-class adolescents, with the middle-class adolescents talking more extensively to their parents than did the lower-class adolescents. More specifically five items were significantly different for both mothers and fathers which were: attitudes on drinking, feelings about how work is appreciated, feelings about people at work, trouble controlling feelings, being attractive to the opposite sex or not. While these five items were significant for both mothers and fathers the following eight items were of significance for mothers: attitudes on racial integration, tastes in music, style of house, how much money is made, to whom money is owed, amount in savings, aspects of personality that are disliked, and feelings about one's appearance in the past. The following three items were significant for fathers: tastes in food, source of income, and ideals of overall appearance. In addition analysis of differences between middle- and lower-class males and females on the items within the Self-disclosure Questionnaire with the lower-class adolescent indicating no self-disclosure in contrast to the middle-class adolescents extensive self-disclosure. Slightly more items were significantly different on self-disclosure to the parent of the same sex than to the parent of the opposite sex. The items of significance for males to fathers were: religion, food, social gatherings, feelings about people at work, and adequacy in sexual behavior. The items of significance for females to mothers were: style of house, present work, ambitions and goals, choice of a career, people at work, things that makes one furious, and adequacy in sexual behavior. The items of significance for the males to mothers were: appreciation of work, amount of savings, and being attractive to the opposite sex. The items of significance for the females to their fathers were: how much money is made and trouble controlling feelings. For the Cathexis Questionnaire there were three target persons: mother, father, and self. Only four of the 40 items in this questionnaire were significantly different between middle- and lower-class adolescents. The lower-class adolescents indicated negative feelings toward their fathers and themselves in contrast to the positive feelings expressed by the middle-class adolescents. Of the four items three were for fathers' general knowledge, intelligence level, and philosophy of life. The only significant item for the adolescents' feelings about themselves was their ability to control emotions. An additional comparison was made for differences between the middle- and lower-class males and females for feelings about their mothers, fathers and themselves. There were only two significant items for the sex comparisons for the items from the Cathexis Questionnaire. The lower-class males indicated negative feelings toward their fathers' general knowledge in contrast to the positive feelings of the middle-class males. The lower-class females indicated negative feelings for their fathers' intelligence level in contrast to the positive feelings of the middle-class females. An extension of the analysis of the differences between the extreme ends of the social class continuum was done by going back to the original 297 subjects and taking all of those in Classes I and II (N = 20) and all of those in Class V (N = 23). The two hypotheses were again tested by using the Self-disclosure and Cathexis Questionnaires. Total scores from the two questionnaires were used in the test of Hypothesis 1 and 2. The results of the t-test indicated that the null hypotheses could not be rejected, for both Hypothesis 1 and 2. The sex comparisons for the two hypotheses also indicated no significant differences on total scores from the two questionnaires. The analysis of the differences in the extent of self-disclosure between the extreme ends of the social class continuum provided a pattern which was the reverse for the random sample of middle- and lower-class adolescents. For the random sample there were more items of significant difference for mothers than for fathers, while there were more items of significant difference for fathers than for mothers for the extreme ends of the social class continuum. The lower socio-economic adolescents indicated no self-disclosure for the significant items in contrast to the upper socio-economic adolescents' extensive self-disclosure to their parents. The three items which were significantly different on self-disclosure to mothers were: attitudes toward other religious groups, satisfaction from present work, and who owes me money. The nine items which were significantly different on self-disclosure to fathers were: religion, standards of beauty, tastes in food, present work, ambitions and goals, who owes me money, different parts of the body, physical measurements, and adequate sexual behavior. The analysis of the differences in the extent of self-disclosure between the males and females of the upper and lower extremes of the social class continuum showed no significant difference. The analysis of the differences between the extreme ends of the social class continuum on the items within the Cathexis Questionnaire indicated one item for mothers and six items for fathers. For all of the items the lower socio-economic adolescents indicated negative feelings in contrast to the positive feelings of the upper socio-economic adolescents. The one significant item for feelings about mothers was her general knowledge. The six significant items for feelings about fathers were his: general knowledge, intelligence level, capacity to work, ability to meet new people, and business sense. The sex comparisons of the extreme ends of the social class continuum of the items within the Cathexis Questionnaire found two items of significant differences. The lower socio-economic females indicated negative feelings about fathers' general knowledge and intelligence level, while the upper socio-economic females indicated positive feelings on these items. The items within the questionnaires which indicated significant differences agreed with the literature on social class which suggests that there is more communication between middle-class parents and their children than for lower-class parents and their children, and that the lower-class adolescents report more negative feelings toward their parents than do the middle-class adolescents. The findings of this study suggest the necessity of additional studies of social class differences in rural settings and comparisons of rural and urban samples which use the same criteria for measuring social class and which use the same instruments for measuring differences among the social classes. Title: A comparison of social class differences in adolescents' self-disclosure, parent-cathexis and self-cathexis Author: Larsen, George Robert The purpose of this study was to investigate the differences between middle- and lower-class adolescents and the extent of their self-disclosure to their mothers and their fathers; and their feelings both positive and negative toward their parents and themselves. The subjects consisted of 50 middle-class and 50 lower-class adolescents who were randomly selected from 297 sophomores and juniors attending the same high school in a rural town in Oregon. Hollingshead's Index of Social Position (1958), which uses the occupation and education of the father as criteria for social class, was used to classify the adolescents by social class. Sex comparisons were also analyzed for differences between the middle- and lower-class adolescents. In attempting to realize this purpose, two major hypotheses were tested: Hypothesis 1: There are no differences between these middle-class and lower-class adolescents in the extent of self-disclosure to their parents. Hypothesis 2: There are no differences between these middle-class and lower-class adolescent's in the extent of positive and negative feelings toward their parents and themselves. The extent of self-disclosure was measured by Jourard's Self-disclosure Questionnaire (1964). This 60 item instrument which permits the subjects to indicate the extent to which they are willing to talk to another person about themselves on the following six categories: A attitudes and opinions, B tastes and interests, C work or studies, D money, E personality, and F body. Total scores from the questionnaire were used in testing Hypothesis 1. The results indicated that the null hypothesis could not be rejected. Comparison of middle- and lower-class males and middle- and lower-class females also did not indicate any significant differences on total scores from the Self-disclosure Questionnaire. The extent of the adolescents' positive and negative feelings toward their parents and themselves was measured by the use of Jourard's Cathexis Questionnaire. This instrument consists of 40 personality traits such as: sense of humor, philosophy of life, temper, and happiness. Total scores from the questionnaire were used in the test of Hypothesis 2. Once again, the results of the test indicated that the null hypothesis could not be rejected. In addition analysis was made of differences between middle- and lower-class males and middle- and lower-class females on total scores from the Cathexis Questionnaire for mothers, fathers and themselves. No significant differences were found for the social class differences for the middle- and lower-class males and females. The items within each questionnaire were then analyzed for significant differences between the middle- and lower-class adolescents. To test for significant differences between social classes for each item within the questionnaires, Chi Square and the Kolmogrov- Smirnov Test were used. Sixteen of the 60 items on the Self-disclosure Questionnaire were found to be significantly different between the middle- and lower-class adolescents, with the middle-class adolescents talking more extensively to their parents than did the lower-class adolescents. More specifically five items were significantly different for both mothers and fathers which were: attitudes on drinking, feelings about how work is appreciated, feelings about people at work, trouble controlling feelings, being attractive to the opposite sex or not. While these five items were significant for both mothers and fathers the following eight items were of significance for mothers: attitudes on racial integration, tastes in music, style of house, how much money is made, to whom money is owed, amount in savings, aspects of personality that are disliked, and feelings about one's appearance in the past. The following three items were significant for fathers: tastes in food, source of income, and ideals of overall appearance. In addition analysis of differences between middle- and lower-class males and females on the items within the Self-disclosure Questionnaire with the lower-class adolescent indicating no self-disclosure in contrast to the middle-class adolescents extensive self-disclosure. Slightly more items were significantly different on self-disclosure to the parent of the same sex than to the parent of the opposite sex. The items of significance for males to fathers were: religion, food, social gatherings, feelings about people at work, and adequacy in sexual behavior. The items of significance for females to mothers were: style of house, present work, ambitions and goals, choice of a career, people at work, things that makes one furious, and adequacy in sexual behavior. The items of significance for the males to mothers were: appreciation of work, amount of savings, and being attractive to the opposite sex. The items of significance for the females to their fathers were: how much money is made and trouble controlling feelings. For the Cathexis Questionnaire there were three target persons: mother, father, and self. Only four of the 40 items in this questionnaire were significantly different between middle- and lower-class adolescents. The lower-class adolescents indicated negative feelings toward their fathers and themselves in contrast to the positive feelings expressed by the middle-class adolescents. Of the four items three were for fathers' general knowledge, intelligence level, and philosophy of life. The only significant item for the adolescents' feelings about themselves was their ability to control emotions. An additional comparison was made for differences between the middle- and lower-class males and females for feelings about their mothers, fathers and themselves. There were only two significant items for the sex comparisons for the items from the Cathexis Questionnaire. The lower-class males indicated negative feelings toward their fathers' general knowledge in contrast to the positive feelings of the middle-class males. The lower-class females indicated negative feelings for their fathers' intelligence level in contrast to the positive feelings of the middle-class females. An extension of the analysis of the differences between the extreme ends of the social class continuum was done by going back to the original 297 subjects and taking all of those in Classes I and II (N = 20) and all of those in Class V (N = 23). The two hypotheses were again tested by using the Self-disclosure and Cathexis Questionnaires. Total scores from the two questionnaires were used in the test of Hypothesis 1 and 2. The results of the t-test indicated that the null hypotheses could not be rejected, for both Hypothesis 1 and 2. The sex comparisons for the two hypotheses also indicated no significant differences on total scores from the two questionnaires. The analysis of the differences in the extent of self-disclosure between the extreme ends of the social class continuum provided a pattern which was the reverse for the random sample of middle- and lower-class adolescents. For the random sample there were more items of significant difference for mothers than for fathers, while there were more items of significant difference for fathers than for mothers for the extreme ends of the social class continuum. The lower socio-economic adolescents indicated no self-disclosure for the significant items in contrast to the upper socio-economic adolescents' extensive self-disclosure to their parents. The three items which were significantly different on self-disclosure to mothers were: attitudes toward other religious groups, satisfaction from present work, and who owes me money. The nine items which were significantly different on self-disclosure to fathers were: religion, standards of beauty, tastes in food, present work, ambitions and goals, who owes me money, different parts of the body, physical measurements, and adequate sexual behavior. The analysis of the differences in the extent of self-disclosure between the males and females of the upper and lower extremes of the social class continuum showed no significant difference. The analysis of the differences between the extreme ends of the social class continuum on the items within the Cathexis Questionnaire indicated one item for mothers and six items for fathers. For all of the items the lower socio-economic adolescents indicated negative feelings in contrast to the positive feelings of the upper socio-economic adolescents. The one significant item for feelings about mothers was her general knowledge. The six significant items for feelings about fathers were his: general knowledge, intelligence level, capacity to work, ability to meet new people, and business sense. The sex comparisons of the extreme ends of the social class continuum of the items within the Cathexis Questionnaire found two items of significant differences. The lower socio-economic females indicated negative feelings about fathers' general knowledge and intelligence level, while the upper socio-economic females indicated positive feelings on these items. The items within the questionnaires which indicated significant differences agreed with the literature on social class which suggests that there is more communication between middle-class parents and their children than for lower-class parents and their children, and that the lower-class adolescents report more negative feelings toward their parents than do the middle-class adolescents. The findings of this study suggest the necessity of additional studies of social class differences in rural settings and comparisons of rural and urban samples which use the same criteria for measuring social class and which use the same instruments for measuring differences among the social classes. Close

• 1932. [Article] Implications of cougar prey selection and demography on population dynamics of elk in northeast Oregon

  Mule deer (Odocoileus hemionus hemionus) and Rocky Mountain elk (Cervus canadensis nelsoni; hereafter elk) populations in northeast Oregon have declined in the past 10 to 20 years. Concurrent with these ...

  Citation × Citation Citation Abstract Copy Title: Implications of cougar prey selection and demography on population dynamics of elk in northeast Oregon Author: Clark, Darren A. Mule deer (Odocoileus hemionus hemionus) and Rocky Mountain elk (Cervus canadensis nelsoni; hereafter elk) populations in northeast Oregon have declined in the past 10 to 20 years. Concurrent with these declines, cougar (Puma concolor) populations have apparently increased, leading to speculation that predation by cougars may be responsible for declining ungulate populations. However, empirical data on cougar diets, kill rates, and prey selection are lacking to support this speculation. Furthermore, the common assumption that cougar populations have increased in northeast Oregon may not be well founded because cougar populations in other areas within the Pacific Northwest region have declined in recent years. My primary research objectives were to (1) estimate kill rates and prey selection by cougars in northeast Oregon, (2) document causes of mortality and estimate survival rates for cougars, (3) estimate population growth rates of cougars in northeast Oregon and simulate the effects of hypothetical lethal control efforts on the cougar population, and (4) investigate the relative influence of top-down, bottom-up, and climatic factors for limiting population growth rates of elk in northeast Oregon. Results from my research will help guide cougar and elk management in northeast Oregon and provide a framework for assessing relative effects of top-down, bottom-up, and abiotic factors on population growth rates of ungulates in this and other areas. I implemented a 3-year study in northeast Oregon to investigate diets, kill rates, and prey selection of cougars in a multiple-prey system to better understand mechanisms by which cougars may influence ungulate populations. During my research, 25 adult cougars were captured and fitted with Global Positioning System (GPS) collars to identify kill sites. I monitored predation sequences of these cougars for 7,642 days and located the remains of 1,213 prey items killed by cougars. Cougars killed ungulates at an average rate of 1.03 per week (95% CI = 0.92 – 1.14); however, ungulate kill rates were variable and influenced by the season and demographic classification of cougars. Cougars killed ungulates 1.55 (95% CI = 1.47 – 1.66) times more frequently during summer (May-Oct) than during winter (Nov-Apr), but killed similar amounts of ungulate biomass (8.05 kg/day; 95% CI = 6.74 – 9.35) throughout the year. Cougars killed ungulates more frequently in summer because juvenile ungulates comprised most of the diet and were smaller on average than ungulate prey killed in winter. Female cougars with kittens killed more frequently (kills/day) than males or solitary females. After accounting for the additional biomass of kittens in cougar family groups, male cougars killed on average more biomass of ungulate prey per day than did females (R = 0.41, P < 0.001), and female cougars killed more biomass of prey per day as a function of the number and age of their kittens (R = 0.60, P < 0.001). Patterns of prey selection were influenced by season and demographic classification of cougars. Female cougars selected elk calves during summer and deer fawns during winter. In contrast, male cougars selected elk calves and yearling elk during summer and elk calves during winter. My results strongly supported the hypothesis that cougar predation is influenced by season, gender, and reproductive status of the cougar and these patterns in cougar predation may be generalizable among ecosystems. The observed selection for juvenile elk and deer suggested a possible mechanism by which cougars could negatively affect population growth rates of ungulates. I investigated survival and documented causes of mortality for radio-collared cougars at 3 study areas in Oregon during 1989 – 2011. Mortality due to hunter harvest was the most common cause of death for cougars in the Catherine Creek study area and the study area combining Wenaha, Sled Springs, and Mt. Emily Wildlife Management Units (WSM study area) in northeast Oregon. In contrast, natural mortality was the most common cause of death for cougars in the Jackson Creek study area in southwest Oregon. Annual survival rates of adult males were lowest at Catherine Creek when it was legal to hunt cougars with dogs (Ŝ = 0.57), but increased following the prohibition of this hunting practice (Ŝ = 0.86). This latter survival rate was similar to those observed at Jackson Creek (Ŝ = 0.78) and WSM (Ŝ = 0.82). Regardless of whether hunting of cougars with dogs was permitted, annual survival rates of adult females were similar among study areas (Catherine Creek Ŝ = 0.86; WSM Ŝ = 0.85; Jackson Creek Ŝ = 0.85). I did not document an effect of age on cougar survival rates in the Catherine Creek study area, which I attributed to selective harvest of prime-aged, male cougars when it was legal to hunt cougars with dogs. In contrast, I observed an effect of age on annual survival in both the WSM and Jackson Creek study areas. These results indicate that sub-adult males had significantly lower survival rates than sub-adult females, but survival rates of males and females were similar by age 4 or 5 years. My results suggest that survival rates of cougars in areas where hunting cougars with dogs is illegal should be substantially higher than areas where use of dogs is legal. I used estimates of cougar vital rates from empirical data collected in northeast Oregon to parameterize a Leslie projection matrix model to estimate deterministic and stochastic population growth rates of cougars in northeast Oregon when hunting cougars with dogs was legal (1989 - 1994) and illegal (2002 - 2011). A model cougar population in northeast Oregon that was hunted with dogs increased at a mean stochastic growth rate of 21% per year (λ[subscript s] = 1.21). Similarly, I found that a model cougar population that was subjected to hunting without dogs increased at a rate of 17% per year (λ[subscript s] = 1.17). Given that hunting cougars with dogs typically results in increased harvest and reduced survival rates of cougars, it was unexpected that the cougar population subjected to hunting with dogs was increasing at a faster rate than one that was not hunted with dogs. However, cougar populations in Oregon were subjected to low harvest rates when hunting cougars with dogs was legal and harvest was male biased. This resulted in high survival rates of female cougars and correspondingly high population growth rates. The Oregon Cougar Management Plan allows the Oregon Department of Fish and Wildlife to administratively reduce cougar populations to benefit ungulate populations, reduce human-cougar conflicts, and limit livestock depredation. Consequently, I was interested in modeling the effects of a hypothetical lethal control effort on a local cougar population. Using empirically-derived vital rates and a deterministic Leslie matrix model, I found that the proportion of the cougar population that would need to be removed annually to achieve a 50% population reduction within 3 years was 28% assuming a closed population, and 48% assuming maximum immigration rates into the population. Using a stochastic Leslie matrix model, I also determined that the model cougar population would likely return to its pre-removal size in 6 years assuming a closed population, and 2 years assuming maximum immigration rates. These model results indicate that current management practices and harvest regulations, combined with short-term, intensive, and localized population reductions, are unlikely to negatively affect the short-term viability of cougar populations in northeast Oregon. However, at this time, it is not known if intensive lethal control efforts funded by state agencies will be cost-effective (i.e., increased sales of tags to hunt deer and elk will offset the costs of control efforts). Further research is needed to investigate the cost-effectiveness of cougar control efforts in Oregon. I developed a Leslie matrix population model, parameterized with empirically-derived vital rates for elk in northeast Oregon, to investigate the relative influence on elk population growth rates of (1) survival and pregnancy, and (2) top-down, bottom-up, and climatic variables. I then estimated the effect of varying the strength of top-down factors on growth rates of elk populations. Growth rates of the model elk population were most sensitive to changes in adult female survival, but due to the inherent empirical variation in juvenile survival rates explained the overwhelming majority of variation in model population growth rates (r² = 0.92). Harvest of female elk had a strong negative effect on model population growth rates of elk (r² = 0.63). An index of cougar density was inversely related to population growth rates of elk in my model (r² = 0.38). A delay in mean date of birth was associated with reduced juvenile survival, but this had a minimal effect on population growth rates in my model (r² = 0.06). Climatic variables, which were used as surrogates for nutritional condition of females, had minimal effects on population growth rates. Likewise, elk density had almost no effect on population growth rates (r² = 0.002). The results of my model provided a novel finding that cougars can be a strong limiting factor on elk populations. Wildlife managers should consider the potential top-down effects of cougars and other predators as a limiting factor on elk populations. Title: Implications of cougar prey selection and demography on population dynamics of elk in northeast Oregon Author: Clark, Darren A. Mule deer (Odocoileus hemionus hemionus) and Rocky Mountain elk (Cervus canadensis nelsoni; hereafter elk) populations in northeast Oregon have declined in the past 10 to 20 years. Concurrent with these declines, cougar (Puma concolor) populations have apparently increased, leading to speculation that predation by cougars may be responsible for declining ungulate populations. However, empirical data on cougar diets, kill rates, and prey selection are lacking to support this speculation. Furthermore, the common assumption that cougar populations have increased in northeast Oregon may not be well founded because cougar populations in other areas within the Pacific Northwest region have declined in recent years. My primary research objectives were to (1) estimate kill rates and prey selection by cougars in northeast Oregon, (2) document causes of mortality and estimate survival rates for cougars, (3) estimate population growth rates of cougars in northeast Oregon and simulate the effects of hypothetical lethal control efforts on the cougar population, and (4) investigate the relative influence of top-down, bottom-up, and climatic factors for limiting population growth rates of elk in northeast Oregon. Results from my research will help guide cougar and elk management in northeast Oregon and provide a framework for assessing relative effects of top-down, bottom-up, and abiotic factors on population growth rates of ungulates in this and other areas. I implemented a 3-year study in northeast Oregon to investigate diets, kill rates, and prey selection of cougars in a multiple-prey system to better understand mechanisms by which cougars may influence ungulate populations. During my research, 25 adult cougars were captured and fitted with Global Positioning System (GPS) collars to identify kill sites. I monitored predation sequences of these cougars for 7,642 days and located the remains of 1,213 prey items killed by cougars. Cougars killed ungulates at an average rate of 1.03 per week (95% CI = 0.92 – 1.14); however, ungulate kill rates were variable and influenced by the season and demographic classification of cougars. Cougars killed ungulates 1.55 (95% CI = 1.47 – 1.66) times more frequently during summer (May-Oct) than during winter (Nov-Apr), but killed similar amounts of ungulate biomass (8.05 kg/day; 95% CI = 6.74 – 9.35) throughout the year. Cougars killed ungulates more frequently in summer because juvenile ungulates comprised most of the diet and were smaller on average than ungulate prey killed in winter. Female cougars with kittens killed more frequently (kills/day) than males or solitary females. After accounting for the additional biomass of kittens in cougar family groups, male cougars killed on average more biomass of ungulate prey per day than did females (R = 0.41, P < 0.001), and female cougars killed more biomass of prey per day as a function of the number and age of their kittens (R = 0.60, P < 0.001). Patterns of prey selection were influenced by season and demographic classification of cougars. Female cougars selected elk calves during summer and deer fawns during winter. In contrast, male cougars selected elk calves and yearling elk during summer and elk calves during winter. My results strongly supported the hypothesis that cougar predation is influenced by season, gender, and reproductive status of the cougar and these patterns in cougar predation may be generalizable among ecosystems. The observed selection for juvenile elk and deer suggested a possible mechanism by which cougars could negatively affect population growth rates of ungulates. I investigated survival and documented causes of mortality for radio-collared cougars at 3 study areas in Oregon during 1989 – 2011. Mortality due to hunter harvest was the most common cause of death for cougars in the Catherine Creek study area and the study area combining Wenaha, Sled Springs, and Mt. Emily Wildlife Management Units (WSM study area) in northeast Oregon. In contrast, natural mortality was the most common cause of death for cougars in the Jackson Creek study area in southwest Oregon. Annual survival rates of adult males were lowest at Catherine Creek when it was legal to hunt cougars with dogs (Ŝ = 0.57), but increased following the prohibition of this hunting practice (Ŝ = 0.86). This latter survival rate was similar to those observed at Jackson Creek (Ŝ = 0.78) and WSM (Ŝ = 0.82). Regardless of whether hunting of cougars with dogs was permitted, annual survival rates of adult females were similar among study areas (Catherine Creek Ŝ = 0.86; WSM Ŝ = 0.85; Jackson Creek Ŝ = 0.85). I did not document an effect of age on cougar survival rates in the Catherine Creek study area, which I attributed to selective harvest of prime-aged, male cougars when it was legal to hunt cougars with dogs. In contrast, I observed an effect of age on annual survival in both the WSM and Jackson Creek study areas. These results indicate that sub-adult males had significantly lower survival rates than sub-adult females, but survival rates of males and females were similar by age 4 or 5 years. My results suggest that survival rates of cougars in areas where hunting cougars with dogs is illegal should be substantially higher than areas where use of dogs is legal. I used estimates of cougar vital rates from empirical data collected in northeast Oregon to parameterize a Leslie projection matrix model to estimate deterministic and stochastic population growth rates of cougars in northeast Oregon when hunting cougars with dogs was legal (1989 - 1994) and illegal (2002 - 2011). A model cougar population in northeast Oregon that was hunted with dogs increased at a mean stochastic growth rate of 21% per year (λ[subscript s] = 1.21). Similarly, I found that a model cougar population that was subjected to hunting without dogs increased at a rate of 17% per year (λ[subscript s] = 1.17). Given that hunting cougars with dogs typically results in increased harvest and reduced survival rates of cougars, it was unexpected that the cougar population subjected to hunting with dogs was increasing at a faster rate than one that was not hunted with dogs. However, cougar populations in Oregon were subjected to low harvest rates when hunting cougars with dogs was legal and harvest was male biased. This resulted in high survival rates of female cougars and correspondingly high population growth rates. The Oregon Cougar Management Plan allows the Oregon Department of Fish and Wildlife to administratively reduce cougar populations to benefit ungulate populations, reduce human-cougar conflicts, and limit livestock depredation. Consequently, I was interested in modeling the effects of a hypothetical lethal control effort on a local cougar population. Using empirically-derived vital rates and a deterministic Leslie matrix model, I found that the proportion of the cougar population that would need to be removed annually to achieve a 50% population reduction within 3 years was 28% assuming a closed population, and 48% assuming maximum immigration rates into the population. Using a stochastic Leslie matrix model, I also determined that the model cougar population would likely return to its pre-removal size in 6 years assuming a closed population, and 2 years assuming maximum immigration rates. These model results indicate that current management practices and harvest regulations, combined with short-term, intensive, and localized population reductions, are unlikely to negatively affect the short-term viability of cougar populations in northeast Oregon. However, at this time, it is not known if intensive lethal control efforts funded by state agencies will be cost-effective (i.e., increased sales of tags to hunt deer and elk will offset the costs of control efforts). Further research is needed to investigate the cost-effectiveness of cougar control efforts in Oregon. I developed a Leslie matrix population model, parameterized with empirically-derived vital rates for elk in northeast Oregon, to investigate the relative influence on elk population growth rates of (1) survival and pregnancy, and (2) top-down, bottom-up, and climatic variables. I then estimated the effect of varying the strength of top-down factors on growth rates of elk populations. Growth rates of the model elk population were most sensitive to changes in adult female survival, but due to the inherent empirical variation in juvenile survival rates explained the overwhelming majority of variation in model population growth rates (r² = 0.92). Harvest of female elk had a strong negative effect on model population growth rates of elk (r² = 0.63). An index of cougar density was inversely related to population growth rates of elk in my model (r² = 0.38). A delay in mean date of birth was associated with reduced juvenile survival, but this had a minimal effect on population growth rates in my model (r² = 0.06). Climatic variables, which were used as surrogates for nutritional condition of females, had minimal effects on population growth rates. Likewise, elk density had almost no effect on population growth rates (r² = 0.002). The results of my model provided a novel finding that cougars can be a strong limiting factor on elk populations. Wildlife managers should consider the potential top-down effects of cougars and other predators as a limiting factor on elk populations. Close