Chapter 7: Problem 4

Why are the largest species of poikilotherms found in the tropical and subtropical regions?

Short Answer

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Answer: The largest species of poikilotherms are found in tropical and subtropical regions due to warmer temperatures that result in higher metabolic rates and faster growth rates. These regions also offer abundant resources and stable climates, allowing these animals to reach larger sizes and maintain greater survival rates.

Step by step solution

Define poikilotherms

Poikilotherms, also known as ectotherms or cold-blooded animals, are organisms that rely on their external environment to maintain their body temperature. Their body temperature varies with the external temperature, which significantly affects their metabolic activity. Examples of poikilotherms include amphibians, reptiles, and many fish species.

Discuss the importance of temperature

Since poikilotherms depend on their environment for maintaining their body temperature, their size and survival are influenced by the temperatures they experience. Warmer environments, such as tropical and subtropical regions, allow these animals to have higher body temperatures and thus higher metabolic rates. Higher metabolic rates enable them to grow faster and larger than individuals living in colder regions.

Explain the effects of metabolic rates on poikilotherm size

Metabolic rates determine the speed at which energy is produced and consumed within an organism. The greater the metabolic rate, the more energy becomes available for growth. In warmer environments, the increased metabolic rates of poikilotherms result in faster growth rates, allowing them to reach larger sizes.

Describe the role of available resources

Tropical and subtropical regions typically have greater biodiversity and more abundant resources, such as food and suitable habitats. These resources allow poikilotherm populations to thrive and support larger individuals. Additionally, these regions tend to have more stable climates, which further contributes to the survival and growth of larger poikilotherms.

Summarize the explanation

In conclusion, the largest species of poikilotherms are found in tropical and subtropical regions due to the warmer temperatures, which result in higher metabolic rates and faster growth rates. These regions also provide abundant resources and more stable climates that enable these animals to reach larger sizes and maintain higher survival rates.

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Why are the largest species of poikilotherms found in the tropical and subtropical regions?

Short Answer

Step by step solution

Define poikilotherms

Discuss the importance of temperature

Explain the effects of metabolic rates on poikilotherm size

Describe the role of available resources

Summarize the explanation

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