Textbook Question
According to the island equilibrium model, species richness would be greatest on an island that is
a. Large and remote
b. Small and remote
c. Large and close to a mainland
d. Small and close to a mainland
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51. Community Ecology
Community Structure
1:39 minutesProblem 5
Textbook Question
Which of the following organisms is mismatched with its trophic level?a. algae—producerb. phytoplankton—primary consumerc. carnivorous fish larvae—secondary consumerd. eagle—tertiary or quaternary consumer
Verified step by step guidance1
Identify the role of each organism in the food chain. Producers, like algae, convert sunlight into energy through photosynthesis.
Understand that primary consumers are herbivores that feed directly on producers. Phytoplankton, similar to algae, are also producers, not consumers.
Recognize that secondary consumers are typically carnivores that eat primary consumers. Carnivorous fish larvae, which feed on other smaller organisms or primary consumers, fit this category.
Acknowledge that tertiary or quaternary consumers are predators at the top of the food chain, consuming secondary or other tertiary consumers. Eagles, which can eat carnivorous fish or other animals, are correctly placed at this level.
Conclude that the mismatch in the list is the classification of phytoplankton as a primary consumer, when they are actually producers.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Trophic Levels
Trophic levels represent the hierarchical positions of organisms in a food chain, categorized based on their feeding relationships. Producers, such as plants and algae, occupy the first level, while primary consumers (herbivores) are the second, secondary consumers (carnivores) are the third, and tertiary or quaternary consumers are at the top. Understanding these levels is crucial for analyzing ecological interactions and energy flow within ecosystems.
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Producers and Consumers
Producers are organisms that can create their own food through photosynthesis or chemosynthesis, forming the base of the food web. Consumers, on the other hand, rely on consuming other organisms for energy. Primary consumers eat producers, while secondary and tertiary consumers eat other consumers, illustrating the flow of energy through different levels of the ecosystem.
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Food Web Dynamics
Food webs illustrate the complex interconnections between various organisms in an ecosystem, showing how energy and nutrients circulate. Each organism's role within the web can affect population dynamics and ecosystem health. Misclassifying an organism's trophic level disrupts this understanding, leading to misconceptions about ecological balance and species interactions.
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