The significance of nutrient cycles in ecosystems lies in their role in maintaining ecological balance and supporting life. Nutrient cycles, such as the nitrogen, carbon, and phosphorus cycles, describe the movement of essential elements through different components of the environment, including soil, water, and living organisms. These cycles facilitate the recycling of nutrients, ensuring that ecosystems remain productive and sustainable. Disruptions to these cycles can lead to issues like nutrient runoff, which can cause harmful algal blooms and impact overall ecosystem health.