Study Notes on Running Waters Quiz

Spot Quiz: Running Waters

1. Biggest River in Ireland

  • Definition: The biggest river in Ireland is the River Shannon.
  • Details:
    • Length: Approximately 360 km (224 miles).
    • It flows through multiple counties, including Limerick, Clare, Offaly, Tipperary, and Galway before emptying into the Atlantic Ocean.

2. Term Defining Stream and River Size

  • Term: The term that defines stream and river size is ‘stream order’.
  • Details:
    • Stream order is a method to classify the hierarchy of a river system.
    • Strahler method: Most commonly used; defines the order based on tributaries, with first-order streams being the smallest, and higher orders being formed when two streams of the same order join together.

3. Water Flowing Slowly Through Soil Layers

  • Term: The water flowing slowly through soil layers is referred to as ‘groundwater’.
  • Details:
    • Groundwater occupies the saturated zone beneath the earth's surface.
    • Significance: It plays a crucial role in the hydrological cycle, providing water to wells and springs.

4. Reasons for Streams Being Poor in Diversity

  • Reasons: Streams are relatively poor in biodiversity for several reasons.
    • Environmental Stability: Streams can have unstable environments due to variable flow rates, temperature, and chemistry which can limit species diversity.
    • Competition and Predation: High competition for limited resources and predation pressures can reduce species numbers.
    • Colonization Opportunities: Fewer opportunities exist for new species to colonize due to habitat fragmentation and seasonal flows.

5. Dominance of Ancient Insect Orders in Running Waters

  • Reasoning: Running waters are dominated by ancient insect orders due to evolutionary stability and ecological niches.
  • Details:
    • Ancient orders like Ephemeroptera (mayflies), Plecoptera (stoneflies), and Trichoptera (caddisflies) have adaptations that make them resilient in flowing water environments.
    • They have anatomical features such as streamlined bodies and specialized breathing structures that allow for efficient living in turbulent waters.
    • These insect orders contribute to nutrient cycling and energy flow within aquatic ecosystems, reinforcing their dominance.