In vertebrate societies, what are the costs to an individual...

Name: Problem 6, Chapter 27: Biology
Uploaded: 2019-07-19T06:48:42-08:00
Duration: 1 min 2 s
Channel: Grant Castaneda
Description: In vertebrate societies, what are the costs to an individual who makes an alarm call? Based on research in ground squirrels, which individuals are most likely to make alarm calls, and what benefits do they receive by doing so?

In vertebrate societies, what are the costs to an individual who makes an alarm call? Based on research in ground squirrels, which individuals are most likely to make alarm calls, and what benefits do they receive by doing so?

Key Concepts

Alarm Calling

Alarm calling is a behavior observed in many animal species where an individual emits a warning signal upon sighting a predator. This vocalization serves as an alert to conspecifics about potential danger, enabling them to take evasive action. While it benefits the group by providing critical survival information, it also exposes the caller to increased risks.

Costs of Alarm Calling

The primary costs of alarm calling include an increased risk of attracting the predator’s attention due to the noise, as well as potential energetic expenditure and distraction from other activities such as foraging. The caller may become more vulnerable to predation because its location is revealed at a moment when swift escape or concealment is needed.

Benefits of Alarm Calling

The benefits of making an alarm call include enhancing the survival chances of nearby group members, especially those that are closely related. By alerting kin or allies, the caller helps preserve shared genetic material, indirectly contributing to its own genetic fitness. This collective protection can be a crucial factor in the evolutionary success of species that engage in alarm calling.

Kin Selection

Kin selection is an evolutionary mechanism that favors behaviors which may reduce an individual’s own survival or reproduction chances, provided that these behaviors significantly benefit related individuals. In the context of alarm calling, even if the caller incurs personal risks, the action is favored by natural selection because it increases the survival probability of relatives who share common genes.

Inclusive Fitness

Inclusive fitness is a concept that encompasses not only an individual's direct reproductive success but also the impact of its actions on the reproductive success of its genetic relatives. Through behaviors like alarm calling, an individual can indirectly ensure that shared genetic material is passed on to future generations, thereby enhancing its overall genetic contribution to the population.

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