MEEC 2019: Tris Dodge’s Pollen Limitation

Hello again!

I’m back with more updates from our team trip to Terre Haute for MEEC 2019. Today, I want to show off the incredible pollen limitation study poster presented by Tris Dodge. Tris joined Team echinacea this last November when he was a Carleton Extern at the Chicago Botanic Garden for three weeks before winter break. As an intern, Tris did a lot of work gathering and analyzing data on our pollen limitation study. If you want to learn more about that study, check out our background page. If you want to see the work that Tris did specifically, check out the flog posts that he has written. Tris’s flog posts include a direct link to his poster

In his analysis, Tris found out that creating seeds is basically free for echinacea plants. If they produce a lot of seeds one year, they can produce a lot of seeds the next year as well. This was not what we had predicted! Tris used the data from 7 years of the pollen limitation study to show that plants that had zero reproduction did not turn into big-leafed, multi-head super plants, but instead look exactly the same as those heads that produced many achenes.

Tris presenting his poster to Nate

Title: Little cost of reproduction in the long lived perennial, Echinacea angustifolia

Presented at: MEEC 2019 at Indiana State University in Terre Haute, IN

When: April 27th, 2019

Carleton College Extern Tris Dodge

Dear flog,

My name is Tris Dodge and I am a winter research extern for the Echinacea Project. I am a senior biology major at Carleton College, interested in understanding how human-driven environmental change is affecting species interactions and causing rapid evolution. I spent the summer of 2017 in Carleton’s restored tallgrass prairies, researching how herbivore exclusion affects soil nutrients and community composition. Last summer, I was a research assistant for two projects at the Rocky Mountain Biological Laboratory (RMBL). I helped gather data on how changing phenology alters the competitive landscape and fitness of perennial wildflowers, and I monitored functional traits, fitness, and glucosinolate chemistry of Boechera stricta in a common garden, as part of a larger genome-wide association study. After graduating from Carleton, I hope to pursue a PhD in ecology or evolution. I enjoy spending my time outdoors and am a member of the cross country and track teams. In my free time, I hike, fly-fish, and knit.

This winter, I am a research extern assisting with projects testing pollen limitation in Echinacea angustifolia and how isolation in space and time affect fitness of Liatris aspera and Solidago speciosa. In practice, each day involves hours of cleaning and counting seeds while thinking about biology. So far, seed counting has allowed me to closely observe the beauty of flower physiology, and has also made me crave sunflower seeds (another Asteraceae). I am very excited to contribute to team Echinacea for these next few weeks!

Carleton Externs – Tris’s Final Update

Hi flog,

Wow! These last three weeks passed by super quickly! While the first two weeks were focused on seed cleaning, seed counting, and x-raying, we spent this past week on our independent projects. But that’s not to say this week was easy! In the past 5 days, I wrote exactly 900 lines of code in R to generate the figures and perform the analyses.

To get at how current pollen limitation affects Echinacea growth and future fitness, I performed analyses testing differences in plant traits between pollen exclusion, pollen addition, and open pollination treatments. I did not find evidence that pollination treatment affected either growth or fitness, which indicates that current pollen limitation will not benefit Echinacea in the future. This could be because Echinacea is not resource limited or because the cost of seed production is negligible.

Many thanks to the members of Team Echinacea who helped guide me through this process and made working in the lab such a pleasure!



Link to Poster