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Mia Stevens

Hey flog! I’m back!

Echinacea Project 2019

Biology, College of Wooster 2020

Research Interests:

In general I am interested in how plants interact with their surroundings, particularly the other plants in the system. I worked with Team Echinacea last year on a project attempting to determine how many pollen grains it takes to set a seed. Turns out it doesn’t matter and on the head a floret is that determines seed set! In the fall/this summer I will be starting my senior thesis/IS (independent study) with a plant called Coral Bean (Erythrina flabelliformis) in Arizona. I will be investigating how mating is affected by the amount of flowers on a plant and geographic/temporal distance between plants.

Personal Interests:

I am now a senior biology major with a minor in environmental studies at the College of Wooster. I am from Buffalo, NY. At school I am former president of knitting club, but recently I have really gotten into embroidery. I also enjoy spending time outside with my dog named Ellie.

Me last summer feeding one of the goats buckthorn

MEEC 2019:

On a different note another student from Wooster (Nate) and I presented at MEEC. We presented a poster on my pollen to seed ratios from my research last summer. As it turns out, pollen is not the limiting resource to determine seed set but instead the location of a floret on the flower head.

Nate and I at MEEC with our poster.

Link to poster:Pollen to Seed Poster

Title: Resources or pollen: examining seed set in a common prairie perennial.

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

When: April 27, 2019

Winchell Conference 2019: Sarah and Julie’s Liatris and Solidago

To take a quick break from all the posts about MEEC 2019, here’s members of Team Echinacea presenting somewhere completely different! Like Tris, Julie and Sarah joined Team Echinacea in November as part of the Carleton extern program. While here, they worked with Lea on her work on Liatris and Solidago, using many of the ACE techinques that we normally reserve for Echinacea. Specifically, Sarah and Julie are looking at how fire at Staffanson Prairie Preserve effects the flowering and seed set of the various Asteraceae there.

Much like Lea is finding in her modelling of these two species, Liatris has a fairly strong interaction with fire, while solidago does not seem to have any interaction. The mechanisms behaind this a certainly still unclear. Julie and Sarah presented these findings at the Winchell Conference – a conference for undergraduate research at their home institution – Carleton College.

Julie and Sara at their poster

Title:Interaction effects of burn treatment and floral display on reproductive success within Liatris aspera and Solidago speciosa

Presented at: 2019 Winchell Undergraduate Research Symposium at Carleton College in Northfield, MN

When: April 27th, 2019

Poster Link: JB and SA Winchell Poster

MEEC 2019: Michael LaScaleia’s Pollen Limitation

Finally, I get to show all of you my poster!

Like Tris, I am also presenting work related to pollen limitation in Echinacea. For my project, I simply tried to find whether pollen limitation is present in Echinacea or not. What I found – it’s not (though, after presenting this poster, there has been some controversy!). It just seems that echinacea produces as much seed as it can up to a certain limit, then stops, regardless of whether more styles were pollinated.

I went a little unorthodox with the way I designed this poster. Instead of the normal “wall of text” design, I instead opted to use the “better poster” design created by Mike Morrison. I really liked using this! It was so incredibly easy to make, and it really facilitated great conversations with everyone who stopped by poster slot #37. I’m very much looking forward to using this poster design each and every time I present from now on.

Michael with his pollen limitation poster

Title: No evidence of pollen limitation in the long-lived perennial Echinacea angustifolia

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

When: April 27th, 2019

Poster Link: MCL Pollen Limitation MEEC Poster

MEEC 2019: Riley Thoen’s Photosynthetic Hybrids

Next up from MEEC we have Riley’s poster about the photosynthetic rates of Hybrid plants in exPt7. Riley collected the data for this project in the summer of 2018, and has been working on aggregating and analyzing since then. The central question behind the research: do Echinacea hybrids between E. angustifolia and E pallida have higher photosynthetic rates than conspecifics?

Riley with his poster

Overall (as the title says), Riley found that E. angustifolia may be in trouble if it has to compete with E. pallida. Both the hybrids and conspecific E. pallida plants were more photosynthetically active than E. angustifolia. Additionally, they had higher survival rates. And to put the final nail in the coffin, the only plant that has flowered in exPt7 is an E. pallida plant. All things considered, Riley’s work is crucial to finding out how to protect E. angustifolia from this invasive species!

Click the link bel0w for a full .pdf of Riley’s Poster

echinaceaPoster2_Thoen

Title: Native Echinacea angustifolia has depressed viability relative to non-native E. pallida and reciprocal hybrids (E. angustifolia E. pallida) in a fragmented prairie habitat

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

When: April 27th, 2019

MEEC 2019: Evan Jackson’s Pollen bank

Hello Flog!

Over the next few days, I’ll be making a few posts about the various Team Echinacea members who attended MEEC (Midwest Evolution and Ecology Conference) 2019. This conference was hosted by the grad students of Indiana State University at Terre Haute from April 26th to 28th. Six members of Team Echinacea attended: Evan, Kristen, Mia, Michael, Riley, and Tris. Everyone made a poster, execpt for Kristen who gave an excellent talk about her research on ground nesting bees.

In this first post, I wanted to highlight Evan’s poster about the echinacea pollen bank. This was work the he and Zeke did in P2 this summer, and is the basis of Zeke’s senior independent study at Wooster College. Evan, and another member of the Ison lab at Wooster, Nate, presented the poster summarizing this work at MEEC. They had by far the most attractive drawing of native bees of any poster present. You can read all about the pollen bank project on the background page for the experiment!

Evan with his MEEC poster

Title: Specialist pollinator Andrena rudbeckiae removes more Echinacea angustifolia pollen per visit than more generalist bee taxa

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

When: April 27th, 2019

Poster Link: Evan Jackson Midwest Ecology and Evolution Conference (MEEC) Poster

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

MACC poster

Hello once again flog!

Last weekend I presented a poster (link below) at the Massachusetts Association of Conservation Commissions convention in Worcester, MA.

This was my first poster symposium and I am glad to say it went great! I was able to interact with so many people attending the conference, along with other student researchers. I received some wonderful comments and feedback, and hopefully was able to make more people aware of soil, native bees, and the Echinacea Project!

My poster focused on the soil texture data I collected over January and its correlation to native bee nesting. After a little more work in R, I found some surprising results. The percent of sand or silt did not have any influence on bee presence. However, between the eight sites and the three land uses,  variation in percent sand was significant. Meaning, soil variation does exist across the Echinacea Project sampling area, it just might not be the strongest factor influencing bee nesting.

The soil is only one component of this project though. We also collected data on the slope, vegetation, percent bare ground, and soil hardness. One of these variables may be the key in understanding native bee nesting, so there’s a lot more analyzing and R to come.

I am so grateful for all the help I have received to make my first poster experience a success!

Until next time!

Click on the link below to see a high resolution image of the poster

annavoldMACCposter19Final

341 samples later

After processing soil samples for two weeks (341 to be exact!) I was able to analyze some of the results and, along with the trusty functions of R (and of course T-Swift music) graph my data. I have included my poster down below and a pdf link.

The results provide evidence that shows soil in western Minnesota contains large percentages of sand and silt, with little clay. Between each of the 8 locations, some variation was present in the amount of sand, but not with clay. The results also showed that sand and silt may have no influence on the nesting locations of native bees. When compared, the graphs of sand and silt percentages from where a bee was found and not found were quite similar. So the question remains- What are the factors that influence where bees build their nests?

Throughout my entire time working on Team Echinacea and this soil project,  I have gained valuable knowledge and experience about data collection, project development, and different research methods. And not to mention the amazing lab group and individuals I have gotten to work/collaborate with! Since my college career is just beginning, the future has a lot in store for me- I can’t wait to see what happens in the next couple of years.

But one thing is for sure, I can officially cross “eat deep dish pizza in Chicago” off my bucket list!

 

 

AnnaVoldposter19.pdf

 

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!

 

Tris

Link to Poster

Aphis echinaceae at Carleton’s Fall Poster Symposium

The aphids were a hit at Carleton’s Summer Research Symposium.

At the Carleton College Summer Research Symposium on October 26th, I presented a poster on my work on the aphid addition/exclusion experiment. Over the summer, I administered the aphid addition and exclusion treatments for the experiment and collected data on leaf senescence and herbivory on plants in the study. Since August, I have been developing an aster model in R to analyze differences in fitness between these two experimental groups. Preparing the aster model for my project was quite a bit of work, but I learned more about R, statistical analysis, and plant-herbivore interactions in the process. Interestingly, Aphis echinaceae has not had an impact on plant fitness over the 8 years of the study.

I am excited to see how the experiment progresses in the coming years, and how the addition of data on seed set affects the results of future fitness models. Quite a few visitors to the symposium were also interested in the results of my analysis and my experience working with the aphids. It was a pleasure to represent the Echinacea Project at Carleton and to have a chance to share the fantastic work the team did over the summer.