Pronghorn Populations

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Questions and Answers

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?

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?

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?

Environmental or extrinsic influences Signup and view all the answers

What did data from pronghorn (Antilocapra americana) reveal about the Bateman slope in a 10-year study?

Presence of a positive Bateman slope in each year Signup and view all the answers

What was the dependent variable in the generalized linear model (GLM) used in the study?

Yearly Bateman slope Signup and view all the answers

Which variable had a negative, linear, and very strong effect on the Bateman slope?

Fawn mortality Signup and view all the answers

What is a potential indicator of the overall probability of survival to recruitment?

Fawn condition Signup and view all the answers

What environmental factor is identified as the primary cause of fawn mortality in the population?

Coyotes Signup and view all the answers

What did the study show about the maximum possible rate of evolutionary change under sexual selection?

It varies with predator-driven offspring mortality Signup and view all the answers

What does the Bateman slope represent?

The linear regression of male number of mates on male number of offspring Signup and view all the answers

What did the study find regarding the distribution of male mating success across mating seasons?

It was highly skewed, not approaching a Gaussian distribution Signup and view all the answers

What did the study conclude about the presence of random effects?

It found no support for the presence of random effects Signup and view all the answers

What did the results of the study support regarding the Bateman principles?

The variance in male number of offspring recruited exceeded that of females Signup and view all the answers

What was the aim of the study in testing the hypothesis of environmentally induced offspring mortality affecting the Bateman slope?

To evaluate the environmental and population elements affecting the maximum intensity of sexual selection Signup and view all the answers

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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Description

Test your knowledge on Bateman principles and sexual selection in pronghorn populations with this quiz. Explore the relationship between male mating success and offspring, the potential for sexual selection, and the impact of environmental factors on the Bateman slope.