Earthworms at the Morgan Arboretum

This is a post written by undergraduate student Jessica Turgeon – she’s finishing up a project about earthworms.

When I was a child, you could always find me either in a tree or in the dirt. I liked to follow the ants up into the trees and back down again, where I would switch over to digging for earthworms. I loved the feeling of soil between my hands and thinking to myself that these little worms were responsible for making the soil the way it is. I now know that the process is a bit more complex than this but overall, five year old me was almost right.

JessicaI spent my whole life loving nature, especially those living in it. By high school I became a strong advocate for environmental protection, even helping a teacher create a bylaw in my municipality to stop parents from idling in front of elementary schools. This experience truly opened my eyes to the will power and determination this generation has when it comes to changing old mentalities about the environment.

When choosing a university to go to, there was no doubt in my mind whether I should apply to Environmental Biology at the Macdonald campus of McGill or not. This program combines both of my passions: nature and its diversity and environmental management. I’ve since embarked on an amazing journey that has shaped me as a person.

Being around so many naturalists rekindled my love for earthworms, so much so that I decided that I wanted to conduct a research project about them. With the help of Chris Buddle (McGill) and NSERC USRA, I decided to take on a project detailing their biodiversity at the Morgan Arboretum, a nearby forest.

Earthworms can greatly affect Southern Quebec soils because all of the species found here are invasive1. Forests have evolved without the help of earthworms, meaning that earthworm burrowing action is somewhat of a new experience for the trees1. The worms break up and mix the soil when they crawl, leaving the soil readily susceptible to erosion2. While earthworms are prized by gardeners as natural tillers, this can have drastic effects on hardwood forests2.

It was important to me to find out where certain earthworms were in the Morgan Arboretum and why they were there. Soils vary in their composition and properties, meaning that some are more suitable for earthworms than others. The goal of my project was to analyze three different soil types (sandy, clay, loam) with regard to earthworm species. I did so by sampling in the three soils and by collecting and analysing the soil using basic soil analyses.

I found no earthworms in the sandy soil over the course of the sampling period, strongly suggesting that no earthworms inhabit sandy soils. Sandy soils are too rough and painful for earthworms to crawl through, therefore they are actively avoided. The clay and loam soils had much higher numbers of individuals, with 9 species each. After statistical testing, it was concluded that there is no significant difference between the two soils and it could be said that they are similar in biodiversity. In addition, a strong correlation between particle density (how dense the soil is) and earthworm abundance was found. As particle density increases, to a certain extent, so does abundance.

Earthworm Sampling

To conclude, my data suggests that the clay and loam soils in the Morgan Arboretum are similar in biodiversity, both supporting an equally diverse number of earthworm species. However, the sandy soil does not contain any earthworms, suggesting that this type of soil is incapable of supporting earthworm activities. This is interesting information for soil management, since, in terms of earthworm abundance and biodiversity, clay and loam soils are similar.

Earthworms are essential ecosystem engineers that change the soil to better suit their lifestyle and this is why they are often studied. Hopefully my story has encouraged readers to respect earthworms a bit more; after all, they do much more than be an excellent fish bait!

 

[1]        Cameron, E. K., Zabrodski, M. W., Karst, J., & Bayne, E. M. (2012). Non-native earthworm influences on ectomycorrhizal colonization and growth of white spruce. Ecoscience, 19(1), 29-37.

[2]        Jouquet, P., Dauber, J., Lagerlöf, J., Lavelle, P., & Lepage, M. (2006). Soil invertebrates as ecosystem engineers: intended and accidental effects on soil and feedback loops. Applied Soil Ecology,  32(2), 153-164.

 

Student for a day (Part 3): operation dissection

This is the third and final post about going back to the classroom: you can find the first post here and the second one here.

We rushed from the lecture hall to the basement of the main teaching complex on campus. I walked down the hall towards the lab, that old familiar smell was in the air: it was the “face-muscle dissection day” in Comparative Anatomy. This took me immediately back to my undergraduate days at the University of Guelph.  There were just over a dozen students in the lab, and the ‘specimens’ (I shall NOT mention what they were!) were sitting on stainless steel lab tables, with the dissection gear at the ready. Scalpel? CHECK. Forceps? CHECK. Scissors? CHECK. It was operation: dissection. I was nervous…. then I was handed rubber gloves and a labcoat. I was WAY out of my element…

The instructor started with an extremely detailed 45 minute lecture, providing an excellent overview of the game-plan for the dissections: the expectations of the students was exceedingly clear, and the instructor’s own deep expertise was obvious.

Checking the notes before the dissection commences...

Checking the notes before the dissection commences…

And then the music went on (yes, music! One of the TAs always picks a lovely selection to work to) and the clang of forceps, scalpels scissors started: the students were off, peeling skin and searching for ever-elusive face muscles. It was hard and tedious work: after 30+ minutes our team had only just begun to expose the first layer of muscles. The students expressed how tough the class was, and how it took an incredible amount of time to study their notes after labs. In addition to their own notes, the textbook, and the laboratory notes, my team was taking photos with their smartphones, and taking some videos to use as future study aids. They have a test coming up soon, and were working hard to remember the content and link the ‘thing’ to the ‘name’. I asked the students why they were taking such a challenging course… surely it was required for their program? It turns out that the course wasn’t required, and the students were taking it because they wanted to. It was one of their favourite classes because it involved ‘doing’ things and involved experiential learning on a topic they were deeply interested in (animal biology). The act of dissecting was how they were learning, and the act of dissecting allowed them to really understand how animals work: from the shape and size of salivary glands, to why certain muscles were more developed than others, or how whiskers are embedded deep under the skin surface.

At one point I looked at the clock and was amazed that a full hour had already passed. I looked up from our specimen (and yes, my lab partners had given it a name…) and did a scan of the laboratory: everyone was hunched over, smiling, and now and then you heard ‘COOL’ and ‘WOW’. They were learning together, learning by doing, and loving it. They loved the challenge of the class and they weren’t watching the clock.

I had to leave and get back to my office, and the instructor came up afterwards to say thanks. I was told that never before had another instructor or Prof stepped into the classroom to see what they were doing. That’s a shame.

With my lab partners.

With my lab partners.

I come away from my “student for a day” experience with some vivid memories, new perspectives, and the following take-home messages:

  • There’s a lot of material! Wow, there was a lot of material! The students are learning a very high volume of content, and this happens day after day after day. No wonder they are sometimes stressed and fall behind. As Profs, we need to perhaps better recognize and respect work loads.
  • Different teaching styles are valuable: from lectures to discussions to hands-on laboratories, the variation was much appreciated. It would be tough sitting through six straight hours of lecture, but varying it between different formats works very well. Education is not, and should not *ever* be uniform. One shoe doesn’t fit all, and there is incredible value to ensuring our students get the variation in educational styles.
  • Spaces are important, perhaps more so than I appreciated before: the physical space itself had a great influence on my time as a student, from the angle of the screen to the placement of the door. The little things matter and the space is a key partner in learning. Variation in available spaces must match variation in different types of courses and instructors. We need big and small lecture halls, well-equipped laboratories, and collaborative learning spaces.
  • Students are bright, motivated, serious, and have high expectations: this is good to recognize. I already felt this about students on my campus, but seeing this first hand in three different classes confirmed my suspicions. We should maintain rigor and approach each course with an expectation that the audience is ready to learn and ready to be engaged.
  • Instructors always rush around from class to class and meeting to meeting, but we sometimes forget that students need to rush around too! There isn’t always time in their schedule to eat, line up for the washroom, or physically get from one classroom to another. This is a reminder for me to end class when it’s supposed to end, and be a little more forgiving when students come in a little bit late.

In sum, I will do this again, and would urge my colleagues to do the same. It’s important to see what students see, learn about different approaches to the classroom, and be sensitive to a full timetable and to the high workload that students experience.

A very special thanks to the students who allowed me to tag along: you were patient, kind, and made the experience extra-special.

Student for a day (Part 2): the lecture hall

This is the second of a three-part series on going back to the classroom: check out the first part here.

So far I was enjoying shadowing students for a day: I was excited after my exposure to the research project course, and was fuelled up on coffee as I checked the schedule, wolfed down my lunch and met my next chaperone. We walked together to a different building and to a more traditional setting: a lecture hall. The class was about animal health, and the content was about a retained placenta in cows, and how this affects bovine health and how the retained placenta might lead to other uterine diseases. The instructor, after setting up the Powerpoint, first took 5-10 minutes to ask the class questions from the last lecture. It was clear that this was a normal start to each lecture as the students had dutifully prepared questions for the instructor, and time and care was taken to address each student. This is a great approach, and although I sometimes do this with my own lectures, I don’t do this consistently at the start of each class. I think the students really appreciated devoting this time to discussion at the start of each of their lectures.

The instructor had carefully prepared slides, and had a very nice pace for the entire 90 minutes lecture. I learned a great deal, from Freemartins, to how to treat a cow with a suspected uterine infection. I was deeply impressed by the depth of knowledge of the instructor: research from peer-reviewed papers was used throughout the lecture, and many anecdotes were used to ground the content. There was a lot of content, and it was also clear that the instructor has high expectations of the students. The instructor was also passionate about the material, and this helped keep my interest.

The view from my seat in the lecture hall.

The view from my seat in the lecture hall.

One of the most interesting experiences for me was being able to view the students’ computer screens from the vantage point of a student! I could see about 6-7 screens, and I had some expectation that Facebook or cruising on web-browsers would occur. To my surprise and delight, students were using their computers largely to take notes: some students had the lecture slides (provided by the instructor before class started) on half their screens and a word processer on another part of their screen and they were moving with ease between the two. This was the definition of effective multitasking. My chaperone had a different approach, and was writing in a spiral-bound notebook. She told me that later on she looks at the lecture slides and cross-references with her hand-written notes as an effective way to study. I was impressed: these students are serious, and have given a lot of thought to the best way to take lecture notes and study. I have previously offered some rather strong opinions about instructors posting Powerpoint slides on-line, but what I was seeing in the classroom was certainly causing me to reflect and reconsider my opinions.

There were three important take-home message for me during this lecture:

  • start each class with questions and answers from the previous lecture
  • bring examples from peer-reviewed literature into lectures
  • recognize that students with laptops in class are using these laptops for class.

After lecture we had to rush (10 minutes between classes is not much time!) through melting snow and mud-puddles to get to the basement of another building for the final adventure for the day…

Student for a day (Part 1): spaces for discussion

Yesterday I went back to the classroom and shadowed undergraduate students for the day. I did this because I just don’t really know what happens in classrooms. As an Associate Dean, I feel a responsibility to be aware of what students face throughout their day. I think this will help me gain perspective in my administrative role, and allow me insights into other instructional styles and approaches to teaching and learning in different contexts. After all, I really only know my way of teaching: I’ve not been an undergraduate student for a very long time.

Due to a bit of poor planning on my part, and since we are nearing the ‘end of term madness’, I wasn’t able to get a schedule for the whole day, and instead attended only three classes, with two different students. These students were my chaperones, and took me under their wing as they went to lecture or lab. By pure chance, I ended up seeing three different kinds of classes during my day, and have reflections about each of these experiences. In the first of this three-part blog series, I will share my experience taking part in an independent research project course.

The first classroom: a conference room

The first classroom: a conference room

This was a very small class in which a few students were working on an independent project: their supervising Professor had recently given the group feedback on their written work, but was not present for this meeting. Instead, it was just the students and me (as a passive observer). Their project was centered on re-thinking environmental education with a goal of developing a framework or plan for teaching 9-12 year old kids about sustainability. The students were taking a very interesting approach in which their framework was focused on facilitating discussion around the values associated with teaching about sustainability: values such as respect, self-worth, respect and compassion. During our time together, the students edited a Google-doc together, and had deep and meaningful conversations about pedagogical principles. This was a wide-ranging discussion that was insightful, thoughtful and fascinating. To be honest, these students knew more about educational principles than most of my colleagues! They were in a science-based program, yet were reading literature from education journals, and were applying high-level thinking to a practical problem about how to create a learning opportunity based not on silos of knowledge, but on ways to approach sustainability from truly interdisciplinary perspectives.

The discussion also moved into a conversation about teaching spaces: for this class, we were actually situated in a conference room, with a couple of chairs, a computer and one of the students was attending virtually, over SKYPE. This learning space was important to them, and at one point one of the students said “You get the most learning outside of the classroom”. Their ideal University is not one of lecture halls, but one of open spaces, whiteboards and WIFI: spaces for debate and discussion about big projects and problems that rely on multiple disciplines. The students expressed frustration that very few of their classes approach problems from interdisciplinary perspectives (or if they do, it barely moves beyond lip service) yet this is what they want from their education. They want a learning community that draws upon all the silos of knowledge at the same time, and they want spaces to facilitate this kind of learning.

A learning space for discussion and collaboration: computer, SKYPE, coffee & notebooks.

A learning space for discussion and collaboration: computer, SKYPE, coffee & notebooks.

These students amazed me with their insights, thoughtful commentary, and clear ideas about education, learning spaces, and expectations from a University experience. ­

My “Student for a day” project was off to a great start. Next up, a traditional lecture hall…

Take the active learning challenge

Dear Instructors,

Here’s your challenge: Include active learning activities in every lecture.

Just do it.

Active learning is a philosophy and approach in which teaching moves beyond the ‘podium-style’ lecture and directly includes students in the learning process. There is certainly a big movement out there to include active learning in the classroom, there is evidence that it works, and active learning strategies have been around for a long time. Active learning can make learning experience more interactive, inclusive, and help embrace different learning styles. Active learning places the student in a more central role in a classroom, and allows students to engage with the course and course content in a different way.

So, why doesn’t everyone embrace active learning?

Without a doubt, it can take a bit of extra work. This post by Meghan Duffy provides an excellent case study, and illustrates the benefits and drawbacks of embracing a ‘flipped classroom’ in a large biology class, and part of that involves heaps of active learning strategies.

Active learning also involves some risk-taking, and perhaps risks that pre-tenure instructors should avoid. The strategies can remove some of the control of the instructor, and this can be uncomfortable for some teachers. For any active learning strategies to work, the instructor, and students, need to be on board, and each strategy brings some challenges, takes time to prepare, and certainly takes time in the classroom.

This term, in my 70+ student ecology class, I decided to take the active learning challenge, and, every lecture, include active learning*. I want to share a few of the things I have done so far, and hopefully show that some ideas are easy and doable, for pretty much any teaching context (note: I do use this book to help generate ideas)

1) The teacher becomes the student: for the last five minutes of class, I pretended to be a student, and asked the students to become the teacher. I then asked them some questions about the course content, drawing upon material from the last couple of lectures. Because I have taught the course for many years, I had a good sense of where some ‘problem areas’ may be, and thus formulated questions that got to the more difficult material. Students then were able to respond to my questions, and share their own expertise with the whole class.

2) Clear and muddy: at the end of one lecture, I asked the students to write down one part of the content they really understood well (the clear), and one area that might be “the muddiest point” (i.e., what they are struggling with). Students handed in the pieces of paper, and I went through and sorted them, and then spent part of the next lecture re-explaining common muddy areas. This was a terrific way to get anonymous feedback, helped reinforce areas that I perceived to be going well, and allowed me to target problem areas in the course.

Here's a "muddy" - this student's comment reflects a common concern around how I teach some of the content.

Here’s a “muddy” – this student’s comment reflects a common concern around how I teach some of the content.

3) Gather in groups: many active learning strategies work best when students are in groups. To quickly set up groups during class, each student holds a ‘card’ with different symbols, letters, numbers, and drawings, and when I call out one of these, the students form groups. I made the cards so students get sorted into groups of different sizes, depending on the activity.

 

Cards given to students, for quick abilities to arrange into groups.

Cards given to students, for quick abilities to arrange into groups.

An easy and effective active learning strategy with groups is to have student discuss among themselves a particular problem or question. After a few minutes, a spokesperson can report back their findings to the whole class. I’ve also had some students come to the front and present the result to the class. This does depend on having ‘enthusiastic’ volunteers, but I have not found this a barrier.

4) IF-AT cards: this term, I am trying to use Instant-feedback assessment-techniques for multiple choice questions. These cards allow students to scratch off answers on a card, and they immediately know if they are right and wrong, and can scratch a second or third time to receive partial points. I have used these in the classroom, for group work, and then students can work on problems (presented by me on the blackboard or screen), debate and discuss the answers, and then scratch off to reveal the correct answer. This activity therefore includes group work, problem solving, discussion and debate, and instant feedback. It does take a little bit of time (20 minutes or so, for a few questions), but is an effective active learning strategy that combines learning with an instant-feedback style of assessment.

5) Pair and share: this is also a simple and effective way to get discussions happening in lecture. I pose a question or idea, and simply have students turn to their neighbour to discuss the answer. I then ask some of the pairs to share their answers or ideas, and I also divide the lecture hall into different sections and ask pairs from each section to report back. This allows full use of the space in the classroom and students at the backs, fronts, or sides are able to feel included.

All of the abovementioned strategies don’t actually take that long and do not require a major overhaul to the course or course content. I believe they are relatively risk-free and easy, and suitable for any instructor, pre-tenure or not. I see these kinds of active learning strategies more as ‘value added’ activities, and as small steps that can increase student engagement in the classroom.

I also teach with chalk, as I find that's a great way to make the classroom more active, for everyone.

I also teach with chalk, as I find that’s a great way to make the classroom more active, for everyone.

 

——–

* Full disclosure: so far I have succeeded in all but one lecture, and I’m eleven lectures in. I’ll post an update at the end of term, to let you know if I’m successful all term!

Social media in higher education: a teaching and learning project

This term I will be spending some time with Teaching and Learning Services (TLS) at McGill: instead of doing my normal winter teaching, TLS is offering me a home for 2-3 days a week to work on projects with them. This is an outstanding opportunity as it provides real and significant time to work on teaching innovation. In my opinion, teaching in higher education should constantly be evaluated and re-assessed, and all Professors (regardless of career stage) should be supported and encouraged to improve, change and innovate their teaching. However, I would argue that many institutions put more attention on research productivity rather than supporting teaching innovation.  This is not to say that Universities don’t value teaching, but rather an argument that promotion is often weighted more towards research productivity than developing innovative approaches to teaching. There is also sometimes a culture by which Professors are unwilling to change anything about their teaching because of fears related to how this might affect teaching evaluation scores.  I have written previously about barriers to teaching innovation, and another barrier is that Professors aren’t typically supported to take time away from other duties to work on projects related to teaching and learning. Sabbaticals, for example, are mostly about re-inventing or re-tooling a research program and less often about pedagogy.  Over the past several years I had these kinds of discussions with various TLS colleagues, and the result is that I now have meaningful support to invest some of my time and energy towards teaching innovation. Bravo, TLS! I’m delighted to be spending time with you this term! (and a sincere thanks to my Chair and Faculty for supporting this endeavour).

It’s fitting that I’m using a blog to discuss the main project I’ll be delving into this term, because it will be all about the use of social media tools in teaching and learning. The way that we teach is changing, in part because there are countless new tools to use; tools that may help with interactions among students or between instructor and students, or tools that help us interact with dynamic, ever-changing content.  It can, however, be overwhelming. There’s an onslaught of technologies (….clickers, video-conferences, tablets, smart-boards and more) as well as countless on-line tools (… Facebook, Google hangouts, blogs, twitter, on-line discussions, etc). How do we make sense of this? How do we incorporate the correct tools into our courses in an effective and productive manner? What ethical or privacy issues must we understand when using some of these tools in the classroom?

My project will try to make sense of all of this, and over the next several months, I will be reading, talking, tweeting, blogging, seeking, sending, writing (and more).  I will be looking to the literature to assess the ways that social media tools can be used effectively in the classroom; I will survey current practices at various institutions, including McGill. At the end of the day, I hope to produce a dynamic ‘document’ to be shared and used by all those who are interested. This document will cover best practices, provide some case-studies and examples, and provide some guidelines about effective use of social media tools in teaching and learning.

Now I shall ask for help: Please let me know about the sorts of social media tools you use in the classroom. Drop me an e-mail, or comment (below), or tweet at me. I hoping to gather examples from a range of disciplines, using a range of tools, in a range of settings (small seminar classes, large courses, field courses, labs). Send me papers you might have written, or links that I’ll need to look at. The products from this project will only be strong if a community can be involved in its development, from the start.

Thanks everyone: this will be a terrific project, and thanks again to TLS and McGill for supporting this project..

The effect of insecticides on jumping spider personalities

This post was written by C. Buddle and R. Royaute (a PhD student in the Arthropod Ecology lab).

We are pleased to announce a recent publication from our lab, titled Interpopulation variations in behavioral syndromes of a jumping spider from insecticide-treated and insecticide-free Orchards.  As is traditional in the lab, here’s a plain language summary of the work:

Agriculture has strongly intensified in the last 60 years, causing major concerns the sustainability of biodiversity. Agricultural practices can reduce habitats available for wildlife and also release toxins in the environment through the use of pesticides. Not all organisms living in agricultural fields are harmful, and many predators, including spiders, can help to reduce pest density. We have a relatively good knowledge that the diversity of spider species in agriculture, especially under our temperate latitudes, can help reduce pest damage. However, many of the factors that influence spider predation on pests depend on the outcome of behavioural interactions and we don’t know much about that topic. Spiders are often cannibalistic and aggressive with one another and these types of behaviours may limit their efficiency for pest control. We also need to understand if these aggressive tendencies vary depending on the type of agricultural field considered, a pesticide treated field may favour very different behaviours than one that is managed organically. Another important point is that populations are composed by a multitude of individuals, each with its own behavioural tendencies. Some individuals take more risks when confronted with predators (i.e. they are more bold), others are more active and explore larger areas or consume more prey. These tendencies – often referred to as personality traits – may also be correlated with one another.

In the context of agriculture, this may mean that certain individual spiders may contribute more to biocontrol because they consume more prey, or that certain individuals are more at risk of being in contact with pesticides because they are more active. To understand, how agricultural practices, and particularly insecticidal applications, affects personality and behavioural syndromes in spiders, we focused on the jumping spider Eris militaris, an abundant and charming jumping spider occurring in apple orchards in Quebec. Here’s a lovely photo from Crystal Ernst to illustrate how attractive they are: (thanks, Crystal, for permission to post the photo here!)

Screen Shot 2013-11-26 at 3.34.45 PM

We collected spiders from pesticide-treated and pesticide-free orchards, brought them back to the laboratory, and did a number of behavioural tests on the individuals from the two populations. Compared to the insecticide-free populations, we document that individuals from orchards that did receive insecticides experienced a shift in their behaviours syndromes. The overall shape of this syndrome is multidimensional, but it suffices to say that the correlations among different behaviours (the ‘syndromes’, otherwise known as the ‘personality’) differed depending on where the population came from.

A 'mirror test' - used to study behaviour in E. militaris (photo by R. Royaute)

A ‘mirror test’ – used to study behaviour in E. militaris (photo by R. Royaute)

In sum, the personality shifts that we documented for E. militaris are potentially quite important since the relationships between different behaviours may affect a spider’s ability to be an effective generalist predator in apple orchards. We need to consider how management  (including use of insecticides) may affect specific behaviours, and more importantly, the relationships between the different behaviours.

Reference

Royaute, R., C.M. Buddle & C. Vincent. 2013.  Interpopulation Variations in Behavioral Syndromes of a Jumping Spider from Insecticide-Treated and Insecticide-Free Orchards. Ethology. doi: 10.1111/eth.12185