University:
Acadia University
Course:
BIOL 2663 | Marine Biology
Academic year:

2024
Views:

382

Pages:

4
Author:

Nabila n.

r-Selected Species: A Closer Look This presentation will dive into the fascinating world of r-selected species, exploring their unique characteristics, ecological roles, and importance in maintaining biodiversity. Characteristics of r-Selected Species Rapid Reproduction Produce a large number of offspring quickly, often with short gestation periods. Short Lifespan Have a relatively short lifespan, with individuals often dying young. Small Body Size Typically small in size, which allows for rapid growth and dispersal. r-Selected vs. K-Selected Species 1 r-Selected Focus on rapid reproduction and population growth. 2 K-Selected Focus on slower reproduction and survival in stable environments. Examples of r-Selected Species Grasshoppers Lay many eggs, grow quickly, and have short lifespans. Mosquitoes Reproduce rapidly, with high numbers of offspring. Weeds Spread quickly and thrive in disturbed environments. Advantages and Disadvantages of r-Selection Advantages Rapid population growth and colonization of new habitats. Disadvantages Susceptible to environmental changes and resource depletion. Ecological Succession and r-Selected Species Early stages of succession are dominated by r-selected species, which can quickly colonize disturbed environments. As succession progresses, K-selected species gradually replace r-selected species. The final stage of succession leads to a stable climax community, with a balance between r and K-selected species. 2 3 Criticisms and Limitations of r/K Selection Theory Oversimplification of complex ecological interactions. 1 r-selectiiate Not all species fit neatly into either category. 2 Intermediate 3 The theory doesn't account for factors such as predation and competition. Conclusion and Key Takeaways 1 Rapid Reproduction r-selected species prioritize reproduction to quickly populate new habitats. 2 Ecological Roles Play a vital role in early stages of succession, contributing to ecosystem dynamics. 3 Adaptations Exhibit adaptations for rapid growth, dispersal, and survival in unstable environments.