Tracking Mayfly Emergence For Science
We caught the hatch! We kicked off our first year of Catch the Hatch project, tracking adult mayfly emergence in three watersheds in the St. Vrain Basin (Boulder, Left Hand, and St. Vrain). The first year was deemed a success as volunteers were able to record the emergence timing of Pale Morning Dun (PMD) mayflies.
Mayflies are important indicators of watershed health. Their life stages are both aquatic and terrestrial, and are driven by dynamic watershed processes. Climate variability in the Front Range, including changes in annual snow pack and seasonal temperatures and precipitation, may impact the phenology of aquatic insects.
While mayflies are critical to our watersheds, science does not do a great job at measuring adult mayfly emergence. Most mayflies are measured in their larval phase because they are easier to sample. Yet adult emergence is critical for reproduction and as a food source for trout. As a community that knows and loves our bugs, we help science better understand our mayflies into the future. The Catch the Hatch community science project aims to track emergence timing of PMD mayflies from year to year in relationship to creek flows and temperature.
What did we learn this year?
- PMDs were observed at all three sites. PMD samples were collected only from Boulder and N. St. Vrain sites.
- PMDs were first observed at Left Hand Creek on June 21st. The majority of observations came after June 27th.
- PMDs were observed throughout the 11 am to sundown timeframe.
What’s next?
- Gather volunteer feedback on methods and protocols.
- Cross check accuracy of identification from collected PMD samples.
- Improve volunteer methods and protocols.
- Determine sampling timeline and locations for next year!
Thanks to our 2019 volunteers and partners for a great sampling season! |