In the study of National 5 Biology ecosystem lesson, it is important to understand the factors that influence the distribution of organisms within an ecosystem.
Biotic and Abiotic Factors
Biotic factors are those associated with living things, such as the number of predators, while abiotic factors are related to non-living things, such as temperature and light intensity. Examples of biotic factors that can affect population distribution include competition for resources, disease, food availability, grazing, and predation. On the other hand, abiotic factors like light intensity, soil moisture, and pH can also have a significant impact on the distribution of organisms within an ecosystem.
Effect of Rabbit Grazing
One example of the impact of biotic factors on the distribution of organisms is the effect of rabbit grazing on plant diversity in grasslands. Rabbits, as unselective grazers, can influence the balance of plant species in an ecosystem by keeping more vigorous plants in check, allowing delicate plants to grow. Removal of rabbits from the ecosystem can lead to a decrease in biodiversity.
Influence of Predators and Prey
The delicate balance between predators and prey is crucial in maintaining biodiversity within an ecosystem. When prey numbers are high, predator numbers increase, causing the prey numbers to fall. As a result, when prey numbers fall below a certain value, predator numbers will start to decrease, leading to an increase in prey numbers.
Competition and Population Distribution
High levels of competition can limit biodiversity and affect the distribution of organisms in an ecosystem. It is important to acknowledge the impact of competition on the population distribution of organisms within an ecosystem.
Case Study: Salmon in the River Tay
An analysis of the population distribution of organisms can be seen in a case study of salmon in the River Tay. The data shows fluctuations in the salmon population over the years, influenced by factors such as water temperature, changes in river temperatures, and the effects of thermal pollution and acid rain.
Textbook Questions
The theoretical knowledge about biotic and abiotic factors is emphasized in the textbook questions, providing a comprehensive understanding of their impact on the population distribution of organisms.
In conclusion, the study of National 5 Biology ecosystem lesson provides insights into the complex interactions between biotic and abiotic factors that influence the distribution of organisms within an ecosystem, and their implications for biodiversity and population dynamics. With this enhanced understanding, students can delve deeper into the intricate balance of life on Earth.
