Understanding Ecosystem Disruptions: Natural and Human-Caused Events

What is an Ecosystem Disruption?

• 💡 A disruption is an event that affects the biotic (living) and abiotic (non-living) parts of an ecosystem.
• 🌲 Wind throw, where strong winds uproot or break trees, is an example of a natural disruption.

Types of Disruptions

• 🌍 Natural disruptions happen on their own, such as droughts, earthquakes, floods, hurricanes, volcanic eruptions, tsunamis, and wildfires.
• 🏭 Human-caused disruptions are events initiated by people, including climate change, overfishing, and pollution.
• 🌳 Deforestation, where large forest areas are cleared without replanting, is a human-caused disruption that destroys habitats and leads to soil erosion.

Scale, Frequency, and Impact

• 📏 Disruptions vary in scale, from small localized events like a single tree falling to major global ones.
• ⏳ They also vary in frequency, from random events like meteorite impacts to predictable ones like hurricane season or regular occurrences like seasonal changes and daily tides.
• 📉 Impacts can be quick, like immediate habitat destruction, or occur over a longer period, potentially leading to species extinction.

Effects on Food Webs

• ⚡ Disruptions can change the flow of energy through a food web.
• 🌲 In a boreal forest, if many spruce trees (primary producers) are damaged, populations of primary consumers (insects, birds, small mammals) may decline.
• 🐺 This decline in primary consumers then affects secondary consumers (predators like coyotes and lynx) by reducing their food source and available energy.
• 🔄 These ripple effects can alter how energy moves through the entire ecosystem.

Observing Ecosystem Changes

• 🔍 When you notice a disruption, consider its potential effects on where organisms live, what they eat, and the overall energy flow within the ecosystem.