key term - Corona

Definition

In the context of certain lophotrochozoans, the term 'corona' refers to a crown-like structure of cilia that surrounds the mouth of an organism. This unique feature is primarily used for feeding and locomotion, allowing these organisms to capture food particles from the water and move through their environment. The corona is an important adaptation that aids in the survival of these aquatic animals, contributing significantly to their ecological roles.

5 Must Know Facts For Your Next Test

1. The corona is mainly composed of cilia, which can beat in a coordinated manner to create water currents that help bring food towards the organism's mouth.
2. In rotifers, the corona can vary in size and shape, adapting to different environmental conditions and feeding strategies.
3. Some species have a highly developed corona that can expand or contract, allowing them to optimize feeding based on food availability.
4. The presence of a corona is a key characteristic that distinguishes certain lophotrochozoans, particularly rotifers, from other groups within the animal kingdom.
5. The effective functioning of the corona not only aids in capturing food but also plays a role in respiration by enhancing water flow over respiratory surfaces.

Review Questions

• How does the structure of the corona contribute to the feeding mechanism in lophotrochozoans?
  • The structure of the corona is crucial for feeding as it consists of cilia that beat rhythmically to create currents in the water. These currents draw food particles towards the organism's mouth, facilitating filter feeding. The efficiency of this feeding mechanism allows lophotrochozoans to thrive in various aquatic environments by capturing microscopic prey.
• Discuss the ecological significance of the corona in rotifers and how it influences their role in aquatic ecosystems.
  • The ecological significance of the corona in rotifers lies in its dual function for feeding and locomotion. By effectively filtering food from the water, rotifers contribute to nutrient cycling in aquatic ecosystems. Their presence helps control algal populations and serves as a food source for higher trophic levels, highlighting their role as both consumers and prey within their environments.
• Evaluate how variations in the morphology of the corona among different rotifer species may affect their adaptability and survival strategies.
  • Variations in the morphology of the corona among different rotifer species can significantly impact their adaptability and survival strategies. For example, species with a larger or more complex corona may be better equipped to capture a wider range of food particles, allowing them to thrive in nutrient-poor waters. Conversely, those with smaller coronas may excel in environments with abundant food sources. This morphological diversity enables rotifers to exploit various ecological niches, demonstrating their resilience and adaptability in changing environments.

Related terms

cilia:

Hair-like structures on the surface of cells that beat in coordinated waves to facilitate movement and feeding in various organisms.

filter feeding:

A feeding strategy where organisms filter small particles from the water, utilizing structures like the corona to capture food efficiently.

rotifer: A group of microscopic aquatic animals known for their rotating, ciliated corona, which aids in both locomotion and feeding.