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Questions and Answers
What is the Bateman slope a quantitative relationship between?
What is the Bateman slope a quantitative relationship between?
- The competition for mates and the advantage of a competitor
- A female’s number of mates and number of offspring
- A male’s number of mates and number of offspring (correct)
- The potential for sexual selection and natural selection
What did Angus Bateman's experiments on Drosophila melanogaster provide support for?
What did Angus Bateman's experiments on Drosophila melanogaster provide support for?
- The presence of random effects in mate success
- The impact of environmental influences on sexual selection
- The influence of natural selection on male success
- Darwin’s sexual selection hypothesis (correct)
What largely requires a positive Bateman relationship?
What largely requires a positive Bateman relationship?
- Male mating success
- Female mating success
- Random effects in calculations of mate success
- Sexual dimorphism (correct)
What can limit the potential for sexual selection according to the text?
What can limit the potential for sexual selection according to the text?
What did data from pronghorn (Antilocapra americana) reveal about the Bateman slope in a 10-year study?
What did data from pronghorn (Antilocapra americana) reveal about the Bateman slope in a 10-year study?
What was the dependent variable in the generalized linear model (GLM) used in the study?
What was the dependent variable in the generalized linear model (GLM) used in the study?
Which variable had a negative, linear, and very strong effect on the Bateman slope?
Which variable had a negative, linear, and very strong effect on the Bateman slope?
What is a potential indicator of the overall probability of survival to recruitment?
What is a potential indicator of the overall probability of survival to recruitment?
What environmental factor is identified as the primary cause of fawn mortality in the population?
What environmental factor is identified as the primary cause of fawn mortality in the population?
What did the study show about the maximum possible rate of evolutionary change under sexual selection?
What did the study show about the maximum possible rate of evolutionary change under sexual selection?
What does the Bateman slope represent?
What does the Bateman slope represent?
What did the study find regarding the distribution of male mating success across mating seasons?
What did the study find regarding the distribution of male mating success across mating seasons?
What did the study conclude about the presence of random effects?
What did the study conclude about the presence of random effects?
What did the results of the study support regarding the Bateman principles?
What did the results of the study support regarding the Bateman principles?
What was the aim of the study in testing the hypothesis of environmentally induced offspring mortality affecting the Bateman slope?
What was the aim of the study in testing the hypothesis of environmentally induced offspring mortality affecting the Bateman slope?
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Study Notes
Bateman Principles and Sexual Selection in Pronghorn Population
- The Bateman principles, codified as three principles, describe the relationship between male mating success and male number of offspring.
- The Bateman slope, the linear regression of male number of mates on male number of offspring, indicates the potential for sexual selection.
- Comparative studies have investigated whether the Bateman slope predicts sexual dimorphism.
- Factors such as environmental conditions and variance in male success could influence the Bateman slope and potential for sexual selection.
- A long-term study using pronghorn population data aimed to test the random effects hypothesis and assess the stability of the Bateman relationship.
- The study collected data on the number and ages of potentially breeding males and females, offspring, and environmental factors such as fawn condition and mortality.
- The random effects hypothesis was tested by evaluating the distribution of male mating success across mating seasons.
- The frequency distribution of the number of offspring produced by breeding-age males was highly skewed, not approaching a Gaussian distribution.
- The study found no support for the presence of random effects and concluded that a population subset of individual males sired most of the offspring.
- The results supported the three Bateman principles, with the variance in male number of offspring recruited exceeding that of females.
- The Bateman slope varied more than fivefold during the decade, offering the opportunity to evaluate the environmental and population elements affecting the maximum intensity of sexual selection.
- The study aimed to test the hypothesis that environmentally induced offspring mortality would affect the Bateman slope.
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