News Archives | Page 4 of 28 | Biological Sciences Blog

Biological Sciences Faculty Members Receive Exceptional Spring 2023 Student Evaluation Scores

Published May 10, 2023

Heartiest congratulations to the following 10 instructors from the Biological Sciences Department who have been identified as some of the only 74 campus-wide instructors who received exceptional “Average of Seven dimensions” student evaluation scores during the Spring 2023 semester.

Only 89 sections university-wide (out of more than 1,411 evaluated) were rated so highly by the students. Their scores were in the top 10% of similarly sized sections university-wide, with at least a 50% response rate and a minimum of five responses.

Provost Storer recently congratulated them for their outstanding accomplishments in teaching.

The following faculty/staff/graduate students received the recognition based on an average of 7 elements of a university-wide class size group with a response rate of >50% on student evaluations of their lecture/lab classes:

Dr. Casey Huckins, Professor and Associate Chair
Ms. Brigitte Morin, MS, Associate Teaching Professor (Winner of MTU teaching award in 2018)
Dr. Gordon Paterson, Assistant Professor
Ms. Claire Danielson, MS, MLS Program Director, and Assistant Teaching Professor (Nominated for the MTU teaching award, 2022 and 2023)
Ms. Sarah LewAllen, MS, MLS Program Coordinator
Ms. Jenna Disser, MS Graduate Student
Mr. Karl Schneider, Ph.D. Graduate Student
Ms. Michelle Kelly, Ph.D. Graduate Student
Ms. Nicole Roeper, MS, Director, Pre-Health Professions, and Instructor
Mr. Hunter Roose, MS Graduate Student

We are very proud of these achievements, and we thank them and you all for fulfilling the educational mission of our university!

The departmental student rating average for Spring 2023 was 4.51 out of 5. Since 2013, our faculty, staff, and students have been in this top 10% of teachers list 162 times.

Amy Marcarelli Receives the 2023 Distinguished Teaching Award

Published May 3, 2023

By

Amy Marcarelli, a professor in Biological Sciences, has received the 2023 Distinguished Teaching Award in the category of Associate Professor/Professor. Dr. Marcarelli is an ecosystem ecologist with an interest in energy and biogeochemical cycles in freshwaters. Her research program blends basic and applied research and integrates across aquatic habitats including stream, river, wetland, lake littoral zones, and the nearshore regions of the Great Lakes.

“That’s fantastic news. Amy is not just passionate about educating the next generation of students but also very kind to her students and creative with her courses. We greatly appreciate her dedication and contributions to the teaching mission of Michigan Tech,” Chandrashekhar Joshi, the Department Chair of Biological Sciences, said.

Dr. Marcarelli said, “Thank you to all of my colleagues in the Biology Department for creating a community where teaching is valued, where we learn from and support each other in our teaching journeys, and where student success is the top priority in and out of the classroom. I believe that community is why we have had such success in this award, with many more who have been nominated (and with awards in their futures, I’m sure!). I am inspired by you, and grateful to have you as colleagues and friends.”

Since 1982, a Michigan Tech Distinguished Teaching Award is presented annually in each of two categories: Associate Professor/Professor and Assistant Teaching Professor/Associate Teaching Professor/Teaching Professor/Professor of Practice/Assistant Professor.

Since 1999, a group of five finalists in each of the two categories is selected based on student ratings of instruction completed during a calendar year. All instructional personnel who received at least 35 student ratings during spring and fall semesters within that calendar year are eligible except for those who are previous winners, department chairs, teaching assistants, temporary hires, etc. Eligible faculty are ranked by their cumulative average of the 7-Dimensions on the survey for the given year. The top 5 in each category are selected as finalists.

On behalf of the students, staff, and faculty in the Biological Sciences department, we congratulate Dr. Marcarelli for winning the 2023 Distinguished Teaching Award. It is a terrific achievement. We thank you for your excellent contributions to Michigan Tech’s critically important teaching mission.

In Print: Trista Vick-Majors

Published April 27, 2023

By

Congratulations to Trista Vick-Majors and colleagues who recently published a paper titled “Constraints on the Timing and Extent of Deglacial Grounding Line Retreat in West Antarctica” in AGU Adventures.

Graph indicating the subglacial core locations along with filling and draining amounts — (a) Southern Ross Sea sector ice streams with previous subglacial core locations (Whillans Subglacial Lake (SLW; Tulaczyk et al., 2014), Whillans Grounding Zone (WGZ; Venturelli et al., 2020), the upstream site at of Whillans Ice Stream (UpB; Engelhardt & Kamb, 1997), and Crary Ice Rise (CIR; Bindschadler et al., 1988) marked with gray circles, Mercer Subglacial Lake (SLM) indicated with a purple circle, and the lake directly upstream Conway Subglacial Lake (SLC) labeled. Ice velocity (Mouginot et al., 2019) is overlain on an imagery mosaic (Scambos et al., 2007), with active subglacial lake areas (blue polygons; Siegfried & Fricker, 2018), hydropotential flow paths (blue lines; Siegfried & Fricker, 2018), and grounding line (black; Depoorter et al., 2013) indicated. (b) Volume changes in Mercer Subglacial Lake inferred from CryoSat-2 radar altimetry (Siegfried et al., 2023) with a yellow star marking the timing of sampling.

Abstract

Projections of Antarctica’s contribution to future sea level rise are associated with significant uncertainty, in part because the observational record is too short to capture long-term processes necessary to estimate ice mass changes over societally relevant timescales. Records of grounding line retreat from the geologic past offer an opportunity to extend our observations of these processes beyond the modern record and to gain a more comprehensive understanding of ice-sheet change. Here, we present constraints on the timing and inland extent of deglacial grounding line retreat in the southern Ross Sea, Antarctica, obtained via direct sampling of a subglacial lake located 150 km inland from the modern grounding line and beneath >1 km of ice. Isotopic measurements of water and sediment from the lake enabled us to evaluate how the subglacial microbial community accessed radiocarbon-bearing organic carbon for energy, as well as where it transferred carbon metabolically. Using radiocarbon as a natural tracer, we found that sedimentary organic carbon was microbially translocated to dissolved carbon pools in the subglacial hydrologic system during the 4.5-year period of water accumulation prior to our sampling. This finding indicates that the grounding line along the Siple Coast of West Antarctica retreated more than 250 km inland during the mid-Holocene (6.3 ± 1.0 ka), prior to re-advancing to its modern position.

O-fish-ally Fin-tastic Research!

Published April 26, 2023

By Riley Powers

Tessa Tormoen is a fourth-year student majoring in ecology and evolutionary biology with a minor in fish biology. She is one of the most adventurous people you’ll ever meet. You can often find her cross-country skiing on the Swedetown and Tech Trails. Not only is she a fan of heart-racing adventures, but her curiosity has also led to her getting involved in undergraduate research. Throughout Tessa’s classes, she learned the basic skills and processes needed in the lab. Her confidence grew. She was ready to put these skills into practice and take on an independent project. In the fall of 2021, she discussed her interest with Dr. Kristin Brzeski, assistant professor at Michigan Tech.

A picture of Tessa in the lab using a pipette to transfer a sample. — Tessa in the lab

Fishing for DNA

Dr. Brzeski put Tessa to work observing Golden and Blueline Tilefish. She extracted DNA from the digestive tracts of predator fish and constructed what the taxonomic group looks like by using a method called Metabarcoding, which is a process of DNA sequencing and identification. Using this technique she was able to characterize the dietary composition of the two different tilefish species to better determine the species’ niche breadth (or use of food resources in this case) and degree of similarity. This is one factor showing how the two species co-exist.

Like any craft, it’s a continual learning process. Working alongside graduate students and mentors, she developed her independent problem-solving and management technique. Learning the ins and outs of research was a steep learning curve, but Tessa was able to gain valuable skills and knowledge during her time as a researcher. “It’s a joy to have an undergraduate like Tessa in the lab. She brings passion, intelligence, and a genuine interest in research and natural resource conservation to every interaction,” said Dr. Brzeski.

Tessa exhibited her research at the 2023 Undergraduate Research Symposium, winning the third place GLRC award. She also won a merit award at the Ecosystem Science Center poster session. And she presented her findings at the Wildlife Society National Conference in Spokane, Washington with others in her lab.

Tessa is presenting her research to an audience by referring to a poster. The audience is pictured from behind. — Tessa presents her research “Using DNA Metabarcoding to Evaluate Dietary Resource Partitioning Between Two Sympatric Tilefish” at the 2023 Undergraduate Research Symposium

A Close-Net-Bunch

Tessa believes that her experiences in research have helped shape the future for the better. “I’m a lucky person. I’ve had an incredible four years. Jill Olin and Kristin Brzeski [have] built me into an independent scientist. They taught me how to solve problems, how to be independent and confident in my abilities,” she says. She credits both graduate and undergraduate colleagues in the lab with perpetuating the culture Drs Brzeski and Olin cultivated. “It was a welcoming and hopeful atmosphere.”

That feeling extends to the department. “Everyone is extremely kind, no matter who you talk to! All of my professors throughout my coursework have been very approachable and extremely passionate about what they study. I love that the biological sciences department is so personal and you can build relationships with the faculty. It truly makes the department’s environment so incredible. The support I have received from my advisor and my professors has been a valuable part of my education. I also love how the biological sciences department is a bit smaller compared to other departments like engineering. Each semester I recognize many familiar faces. I’ve been able to create great relationships with my peers through this,” Tessa said.

The Water is Just Right at Michigan Tech

Like many before her, Tessa chose to study ecology and evolutionary biology at Michigan Tech because she fell in love with this area. “I realized that I have a passion for understanding the world around me and this is a beautiful place to do that,” she said. “Plus, the experiences you’re able to have in this degree are fantastic, and I was compelled by the sheer amount of opportunities available to me.”

Tessa appreciated the flexibility the ecology and evolutionary biology degree program offered. “A lot of the coursework is electives that you get to choose from, so you can tailor your education to what you are most interested in. Thus, I was able to take courses like Mammalogy, Tropical Island Biology, Valuing the Great Lakes, Botany, and more!” Tessa said. “Sometimes you get to go outside for classes; one of my biggest memories from my degree is my Tropical Island Biology course, where we stayed in the Bahamas over Spring Break. This degree program has given me such a strong foundation and a whole list of interests that I can build upon with secondary education and post-education work experience.”

Tessa Tormoen enjoys the views of Portage Lake from the Biological Sciences Lounge

In addition to research and the degree program, Tessa took advantage of other opportunities on campus. She served as vice president of the Ski and Snowboard Club. Tessa also coordinated activities as part of the Women’s Leadership Council.

Leaving the School: Tessa’s Post-Graduation Plan

Following commencement this month, Tessa plans to “go with the flow.” This summer, you’ll find her on Isle Royale working as a fisheries technician, performing limnological assessments and fish surveys on their inland lakes. “I’m excited about this opportunity as it honestly feels like a dream job,” she said.

After taking one year to work in the field and gain more experience, Tessa wants to return to school for her master’s degree and potentially a Ph.D. “I think my experience at Michigan Tech has helped me greatly in understanding the opportunities available to me after graduation. I think that my education, research experience, and relationships at Tech have set me up for success once I leave,” she said.

We are certain her future will go swimmingly well!

29th Annual Student Leadership Awards: BioSci Recipients

Published April 18, 2023

By

Several students in our department were recipients of the 29th Annual Student Leadership Awards this year in recognition for their truly incredible accomplishments! Please join us in congratulating them!

Student Employee of the Year:
Enioluwa Wright
Human Biology with a Pre-Health minor

Rising Star of the Year:
Riley Stichter
Human Biology with Pre-Health and Public Health minors

Department Scholar:
Haley Marchese
Medical Laboratory Science with a Pre-Health minor

The keynote speaker, Dr. Jessica Thompson (Thoresen) ’12 (B.S., Biological Sciences), was also recognized as the recipient of the 2023 Outstanding Young Alumni Award.

More information about the awards and the recipients can be found on the Student Leadership Awards webpage. We also invite everyone to save the date for the 30th Annual Student Leadership Awards Ceremony, which will be held April 12, 2024, in the MUB Ballroom.

Call for Applications: 2023 Songer Research Award for Human Health

Published April 13, 2023

By

Matthew Songer, (Biological Sciences ’79) and Laura Songer (Biological Sciences ’80) have generously donated funds to the College of Sciences and Arts (CSA) to support a research project competition, the Songer Research Award for Human Health, for undergraduate and graduate students. Remembering their own eagerness to engage in research during their undergraduate years, the Songers established these awards to stimulate and encourage opportunities for original research by current Michigan Tech students.

Students may propose an innovative medically-oriented research project in any area of human health. The best projects will demonstrate the potential to have a broad impact on improving human life. This research will be pursued in consultation with faculty members within the College of Sciences and Arts. The Songers’ gift and matching funds from the College will support two awards for undergraduate research ($4,000) and two for graduate research ($6,000), for research conducted over the Summer of 2023 and/or the following academic year.

Learn more about who is eligible to apply, how to apply, and how the funds may be used.

Submit applications as a single PDF file to the Office of the College of Sciences and Arts by 4:00 p.m. Monday, April 24, 2023. Applications may be emailed to djhemmer@mtu.edu. Any questions may be directed to David Hemmer (djhemmer@mtu.edu).

BioSci Mushers Compete in the CopperDog

Published April 11, 2023

By

As anyone who has attended Michigan Tech will tell you, engaging in a winter sport makes the long, dark, snowy days and challenging coursework bearable. For two BioSci students, mushing is the perfect winter diversion. The Michigan Tech Mushing Club is where they practice their sport. Both competed in the CopperDog races that took place March 3-5, 2023 in the Keweenaw Peninsula.

Alyssa, Haley, and friend standing on the sidewalk with a sunset background — Alyssa (middle) and Haley (right)

Alyssa Sarland Races in Her Second CopperDog

This year, Alyssa Sarlund, a fourth-year Biology major, took on the CopperDog80 with leads Agate and Heather. It was a big step up from the CopperDog25 last year. “Going from a one leg race to a two leg race I was definitely more nervous because I had a downtown start and there were quite a few people lining the gate at the start. Overall the course itself had a lot more hills and was more difficult. I trained for the second race longer than the first one, so I was pretty comfortable on the sled,” she said.

Alyssa was happy placing 8th out of 9 total participants in the 80. Her sled glided over the course in just under 9mph on average, for a total of 9 hours and 45 minutes. The 80 is a two day race and, although it was hard, she said it was a lot of fun. The second day was sunny with blue skies, and a bit warm for running but it made for a nice day to be out on the sled.

Previously, Alyssa volunteered with the CopperDog in 2021, too. “When I volunteered, I was set at a road crossing and helped other volunteers move a gate back and forth for mushers/snowmobilers to go the correct way on the trail,” she said.

Sled with two people being pulled by dogs — Alyssa on the sled with Joel Diccion driving

Dipping Her Paws Into The CopperDog

Haley Marchese, a third-year Medical Laboratory Science major, raced in her first CopperDog. She tackled the 30 with her lead dogs Bud and Violet. It was truly an exciting debut in the CopperDog. “It was very nerve-racking at first because I had my family, friends, professors, and many others who came to the race start to support me and the other mushers. I was also a little nervous because I had a full team of yearlings (besides one of my leader dogs) running their first race. My race was also at night, so that played into my nerves a little at first too. I had a great start down the chute giving high fives to all the little kids watching and about a mile into the race my nerves calmed down and I started to have a lot of fun!” she said.

Haley placed 17th out of 20 participants, which is amazing considering her rookie status. Plus, the majority of her team, including one of her leaders, were yearlings running their first race. Like Alyssa, her team ran just under 9mph, making her total time 3.5 hours over the course of a day’s race.

Mushing Club Offers a Great Winter Diversion for Tech Students

Sled being pulled by dogs with crowd cheering — Haley starting the CopperDog30

The only collegiate sled dog club in the US, the Michigan Tech Mushing Club requires commitment. Members clean the kennels, feed and water the dogs, and train the dogs during the fall, winter, and spring. Members gain plenty of experience in caring for the dogs, learning about racing and the incredible dog athletes, and teaching others about the sport.

Alyssa enjoys getting away from a screen and taking in the fresh air for a few hours. “While running, it’s usually pretty quiet and all you hear is the dogs’ footsteps, and watching the sunset go down is a very unique experience that I have found to be truly surreal,” she says.

In the winter, new members can get on a sled for the first time. Those putting in time training and running the dogs get to race. Other members are content simply petting the dogs for stress relief from school. Others relax riding on a sled rather than driving it.

Haley enjoys introducing the sport of mushing to new members and/or community members. “I have so much fun teaching others how to harness a dog and how to drive a sled for the first time. I get a lot of joy seeing the thrill and excitement it brings to people who are doing it for the first time,” she says.

BioSci Mushers Get a Leg Up on a Career

Mushing lets students acquire important skills they will need in the years ahead. Haley says “I think mushing has helped me develop many soft skills that are important in a career in biology, medical lab science, veterinary, or medicine. Mushing has taught me a lot about patience, teamwork, building mutual respect, and critical thinking.”

Haley being pulled on a sled behind eight dogs — Haley training for the CopperDog race

“As you would expect mushing requires physical strength and stamina; however, over the past two years I’ve been involved in mushing, I’ve learned mushing also requires a lot of mental strength. There are times when you have a bad training run and you have to learn to be patient with the dogs and with yourself and persevere through the difficult moments. You also have to be able to critically think and act quickly if a challenging situation arises. Those are just a few of the skills and qualities that I’ve improved or learned from mushing that I can apply to my future career,” she says.

Mushing helped Haley to get a leg up in the classroom, too. “There are many times I’ve been able to connect what I’m learning in my biology classes with what I’ve learned from mushing. For example, I learned that some sled dogs suffer from a genetic form of cardiomyopathy, which is something I’ve learned a lot about in my upper-level biology courses and it so happens to align with the topic of my undergraduate research,” she added.

“I plan to apply to vet school, so knowing what it’s like working with animal athletes compared to house pets helps me apply concepts. Athletes’ body systems work differently; they tend to have more muscle and faster metabolisms,” explains Alyssa.

Haley is hoping to parley her degree and experience in the Mushing Club to medical school. “I will definitely have to take a break from mushing during that time, but I’m hoping once I get settled down that I would be able to get back involved in the sport even just as a hobby with a small recreational team of my own,” Haley said.

BioSci Mushers Find Their Pack

Two huskies standing together — Alyssa’s dogs: Donny and Triforce

Haley found out about the club at K-Day last year. K-Day, short for Keweenaw Day, is an annual tradition at Michigan Tech held on the Friday of the week of Labor Day. It is a registered student organization fair with around 200 groups in attendance. It allows Tech students to find and connect with student organizations across campus they may want to join.

A Husky Swim Club friend introduced Alyssa to mushing. Alyssa’s friend drove her to the kennel and introduced her to the club. Alyssa and Haley run with a team from Tom Bauer’s kennel in the Otter River Sled Dog Training Center & Wilderness Adventures. They both agree the Otter River Kennel has done a great job of getting them out on a sled to train and race! Training for mushing can get crazy at times.

It’s Not Always Smooth Sledding For These BioSci Mushers, But They Overcome

Mushers form a great partnership with highly energetic dogs who love to run. And it is an amazing sight when you see a highly functioning sled-dog team moving rapidly down a snow-covered trail through the woods on a crisp winter night. But mishaps do occur. Once while training Alyssa’s team took a turn too early on the trail. The two lead dogs ended up running to either side of a tree, and the dogs wanted to keep running! Alyssa had to get the leads to turn around (no easy task when it comes to these focused dogs) to get back to where they were on the trail!

During this year’s race, Haley got herself into a sticky situation on the trail. While trying to pass another team she ended up losing her sled and the dogs. She had to run a little over a mile after them on foot with a broken headlamp to try to catch them; all the while hoping they got tangled or that a volunteer or another team caught them and stopped them. A fellow racer from the club caught up to Haley while she was still on foot and let her ride in their sled until they overtook her team. Despite this significant challenge, costing Haley a lot of time, she was still able to finish 17th!

In either case, the BioSci Mushers were able to get back on the trail and accomplish their goals. They’ve acquired valuable real-world skills. Clearly, this winter diversion keeps them on the trail leading to a successful future.

Biological Sciences in the Undergraduate Research and Scholarship Symposium

Published April 6, 2023

By

Thank you to all of the Biological Sciences students that presented and shared their research at the 2023 Undergraduate Research and Scholarship Symposium!

Abe Stone, Ecology & Evolutionary Biology
Alyssa Church, Human Biology + Anthropology
Grace Gonzalez, Medical Laboratory Science
Megan Guyer, Biochemistry and Molecular Biology
Ina Klasner, Computational Biology + Applied & Computational Mathematics
Haley Marchese, Medical Laboratory Science
Nathan Ostlund, Biochemistry & Molecular Biology
Brian Reeves, Ecology & Evolutionary Biology
Tessa Tormoen, Ecology & Evolutionary Biology

Overall Awards

First Place – Leah Harazin and Nathan Ostlund: “Stability of Terephthalate Degrading Microbial Consortia for Plastic Upcycling”

Second Place – Haley Marchese: “Sympathetic Activity to the Heart is Increased in a Mouse Model of Hypertrophic Cardiomyopathy”

Third Place – Grace Gonzalez: “The Gut Microbiome of Fish and Its Relevance to Antimicrobial Resistance”

Special awards for research affiliated with the Great Lakes Research Center

First Place — Leah Harazin and Nathan Ostlund: “Stability of Terephthalate Degrading Microbial Consortia for Plastic Upcycling”

Second Place — Grace Gonzalez: “The Gut Microbiome of Fish and Its Relevance to Antimicrobial Resistance”

Third Place — Tessa Tormoen: “Using DNA Metabarcoding to Evaluate Dietary Resource Partitioning Between Two Sympatric Tilefish”

Congratulations to all participants!

Tessa Tormoen

Haley Marchese

Alumni Stories: Manas Warke, PhD, Biological Sciences, Now a Postdoctoral Fellow

Published April 5, 2023

By

Manas Warke graduated from Michigan Tech with his PhD in Biological Sciences in 2022. He is now a postdoctoral fellow at the University of Cincinnati. Manas is currently working on a USEPA project titled: Unregulated Organic Chemicals in Biosolids: Prioritization, Fate, and risk evaluation for land applications. In addition, he’s working with a startup, Phytobox, to implement phytoremediation to clean up polluted water and make it potable. We had a chance to learn more about Manas and his experience at Michigan Tech.

Where are you from?

Manas working in the lab — Manas doing RNA extractions in the COVID lab

Mumbai, India

Where did you do your undergraduate studies, what did you major in, and when did you graduate with your undergrad?

Bachelors in biotechnology from Mumbai University. I graduated in 2017.

Why did you choose to study at Michigan Tech?

I was working on my master’s degree when I learnt about a PhD opening in Dr. Datta’s lab. I chose to study at Michigan Tech because of the opportunities it offered with great labs, research, funding and overall environment.

What are you doing now?

I am working as a postdoctoral fellow at the University of Cincinnati in the Department of Chemical and Environmental Engineering

What do you enjoy most about your postdoctoral fellowship?

I like how I can conduct independent research based on the knowledge and skills I learned at Michigan Tech—meeting new scientists and networking to learn about the exciting research around campus. I also mentor a few students in the lab and the department. The most important is the work-life balance that comes with a postdoc. Since the hours are flexible, I get time to pursue my hobbies, take breaks and spend time with friends.

Manas standing by grass on a porch of a house — Manas in San Antonio with the Vetiver grass for Lead pytoremediation

How did your degree and course of study at Michigan Tech prepare you for success?

Biological Sciences trains you to be a professional in many fields. The research and opportunities Michigan Tech has provided have prepared me to excel in the research field. The excellent lab facilities and collaborative environment at Michigan Tech and the Department of Biological Sciences allowed me to pursue more diverse research and learn many skills. My advisor, Dr. Datta, always encouraged new ideas and thought of better approaches to develop exciting project ideas.

What piece of advice would you give to an undergraduate looking to go to grad school?

If you’re passionate about a specific research field, go for it. It is okay to be unsure of what you want to do next. Ask a lot of questions, even though they seem irrelevant. Always try to meet new people, especially fellow grad students, and colleagues, as they could be friends and potential future collaborators. Participating in research competitions, conferences, and presentations is an excellent way to build a network and know people with the same interests.

How would you change the world with the knowledge you have acquired?

Use my knowledge to tackle global problems of soil and water pollution that pose a significant risk to human health. Share my experience and research to create awareness and advocate for issues like environmental health by participating in local and national events. Actively conduct research that positively impacts society and develop innovative solutions. And lastly, volunteer for non-profits, charities, and community organizations.

In Print: Jill Olin

Published March 30, 2023

By

Congratulations to Jill Olin and her postdoctoral fellow, Jim Junker, who recently published a paper titled “Can biodiversity of preexisting and created salt marshes match across scales? An assessment from microbes to predators” in the Ecosphere Journal. You can learn more about the research on the LSU website.

Abstract: Coastal wetlands are rapidly disappearing worldwide due to a variety of processes, including climate change and flood control. The rate of loss in the Mississippi River Delta is among the highest in the world and billions of dollars have been allocated to build and restore coastal wetlands. A key question guiding assessment is whether created coastal salt marshes have similar biodiversity to preexisting, reference marshes. However, the numerous biodiversity metrics used to make these determinations are typically scale dependent and often conflicting. Here, we applied ecological theory to compare the diversity of different assemblages (surface and below-surface soil microbes, plants, macroinfauna, spiders, and on-marsh and off-marsh nekton) between two created marshes (4–6 years old) and four reference marshes. We also quantified the scale-dependent effects of species abundance distribution, aggregation, and density on richness differences and explored differences in species composition. Total, between-sample, and within-sample diversity (γ, β, and α, respectively) were not consistently lower at created marshes. Richness decomposition varied greatly among assemblages and marshes (e.g., soil microbes showed high equitability and α diversity, but plant diversity was restricted to a few dominant species with high aggregation). However, species abundance distribution, aggregation, and density patterns were not directly associated with differences between created and reference marshes. One exception was considerably lower density for macroinfauna at one of the created marshes, which was drier because of being at a higher elevation and having coarser substrate compared with the other marshes. The community compositions of created marshes were more dissimilar than reference marshes for microbe and macroinfauna assemblages. However, differences were small, particularly for microbes. Together, our results suggest generally similar taxonomic diversity and composition between created and reference marshes. This provides support for the creation of marsh habitat as tools for the maintenance and restoration of coastal biodiversity. However, caution is needed when creating marshes because specific building and restoration plans may lead to different colonization patterns.

Category: News