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Blog

Are We Effecting Fishes’ Hormones?

R. Christian Jones, director of Mason's Potomac Environmental Research & Education Center (PEREC), has received a grant of $167,481 from Alexandria Renew Enterprises, a water resource recovery utility that works to improve local water quality. Jones and his co-PI’s have been tasked with studying water quality and aquatic biota and how they relate to discharges into the Potomac River. Jones is working with a number of graduate and undergraduate students as well as PEREC colleagues on the project, and they are looking at issues including excessive algae and aquatic plant growth and bacteria from sewer overflows. To do that, the researchers are collecting samples of water, sediments and animals in tidal areas of the Potomac and its tributaries. This study builds on previous work for this sponsor which began in 2013. Photo by Evan Cantwell/Creative Services/George Mason University

Written by: Michael Cagle

As a Master’s student, I am looking into the presence of endocrine disruptors in the Potomac River. The endocrine system regulates virtually every activity in animals through the use of chemical compounds called hormones, and plays a vital role in the reproductive system. Specifically, I am looking at compounds that interfere with the normal functioning of the reproductive system by mimicking or disrupting the naturally occurring hormones testosterone and estrogen.

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Blog

Taking the Pulse of a Stream

Written by: Chelsea Gray

How do you tell the health of a river? This is a question that scientist all over the world struggle to answer. A common method for determining stream health is the Stream Bioassessment.

Damselfly
Damselflies lay their eggs in the water. Damselfly nymphs live under the water and are an example of the type of benthic macro-invertebrate found in Virginia streams.

What is a “Stream Bioassment”?

Because you can’t ask a stream how it’s feeling, we use indirect measures of health for an ecosystem. One way we do this for a stream is by identifying what types of organisms live there. In particular, we look at benthic macro-invertebrates, or the bugs that live in the stream bed.

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Blog Education

The Potomac Science Center is Open!

PEREC faculty and staff are absolutely thrilled to finally be working and teaching at our brand new Potomac Science Center! It seems like just yesterday we were touring the unfinished facility.

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Blog

What’s at the Bottom of the Potomac River?

Laura Birsa pulls the ponar onto the boat
Laura Birsa pulls the ponar onto the boat

Written by: Chelsea Gray

Each year, researchers and graduate students from PEREC gather data on Gunston Cove, located just downriver from the Norman M. Cole Jr. Pollution Control Plant. This study has been used to determine the health of the Potomac River for over three decades.

How is a river’s health determined?

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Blog Education

PEREC Faculty highlighted in Mason Spirit

Cindy Smith’s Human Dimensions and Biomes class (EVPP 302) was highlighted recently in Mason Spirit.

She found that some environmental science and biology majors were having difficulty finding jobs without a graduate degree. Looking for answers, she surveyed 10 employers and found that what they wanted most was were employees who had worked on “real” research projects and had “real” field experience. So she reworked the course to include an energy audit of a campus building, which is conducted in partnership with Mason’s Offices of Sustainability and Facilities….

“One of the best parts about my job is the interaction with the students during plant tours—and getting new ideas from them that we can possibly use to save energy,” says Jeffrey Counts, superintendent of the heating and cooling plant in Facilities Management.

 

Read the rest here.

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Blog OSCAR

Water: A Fish’s Pharmacy

Written by: Tabitha King

Here you can see Lisa McAnulty and I weighing out sediment to begin the extraction stage of sample processing. We are and will be using an adaptation of a QuEChERS (Quick, Easy, Cheap, Effective, Rugged, Safe) method to process both our sediment and fish tissue samples.

What if I told you fish could potentially be ingesting caffeine, pain medicine, and other pharmaceuticals on a daily basis? You may be wondering how this is possible since fish do not regularly visit the pharmacy to pick up their prescriptions. However, there is a growing concern amongst scientists and other stakeholders that the very medications we are taking (even common allergy relievers) are not being removed during wastewater treatment. Current regulations placed on wastewater treatment plants do not require the removal of such substances. To make matters worse, if a treatment plant was to take on the task of removing pharmaceuticals from their customers’ sewage, there are new compounds made on a daily basis. Each chemical would require a unique form of effective removal to ensure at least a majority is removed before treated water is discharged into local waterways. It is currently not known at what amounts of these medications are making their way into our local waterways and accumulating in aquatic organisms and sediment.

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Blog Education OSCAR

Are Potomac River Fish Addicted to Drugs?

Written By: Heather Nortz

How many prescription or over the counter drugs are currently in your medicine cabinet? Did you know that your body doesn’t absorb 100% of the drugs you take? What do you do with your expired or unused drugs? Do you think wastewater treatment or drinking water plants remove pharmaceuticals from water before they release it into the environment or to your well or water tower?

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Blog OSCAR

One Fish, Two Fish, Prozac in the Blue Fish

R. Christian Jones, director of Mason's Potomac Environmental Research & Education Center (PEREC), has received a grant of $167,481 from Alexandria Renew Enterprises, a water resource recovery utility that works to improve local water quality. Jones and his co-PI’s have been tasked with studying water quality and aquatic biota and how they relate to discharges into the Potomac River. Jones is working with a number of graduate and undergraduate students as well as PEREC colleagues on the project, and they are looking at issues including excessive algae and aquatic plant growth and bacteria from sewer overflows. To do that, the researchers are collecting samples of water, sediments and animals in tidal areas of the Potomac and its tributaries. This study builds on previous work for this sponsor which began in 2013. Photo by Evan Cantwell/Creative Services/George Mason University

By: Lisa McAnulty

I once heard someone say that if you brought a glass down to the Potomac River and took a long swig of its water, you would have swallowed a small dose of antidepressants. While drinking Potomac River water is highly discouraged, there may be a hint of truth to this statement. Thousands of pharmaceuticals and personal care products are on the market, and many inevitably make their way into rivers and streams through wastewater discharge or other sources. While we might not necessarily be chugging river water on a daily basis, many organisms call the Potomac River home and can’t escape the barrage of these so-called emerging contaminants. However, “emerging contaminants” is a misleading term for pharmaceuticals and personal care products, which have been in our waters for many years. It’s only recently that scientists developed methods sensitive enough to precisely measure trace quantities of these pollutants.

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Blog ecosystem modeling OSCAR

What are Local Fish Eating?

By: Sammie Alexander

As a member of the ecology team for the Potomac Environmental Research and Education Center’s (PEREC) summer OSCAR team project, my research goal is to investigate the predator-prey dynamics between fish and macroinvertebrates in two freshwater tidal Potomac River tributaries, Gunston Cove and Hunting Creek. This means, I examine the stomach content of 15 fish species known to inhabit both embayments in order to construct a food web for each location.

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Blog Education OSCAR

Being an Ecologist

Written By: Michael Rollins; Photo Credit: Sammie Alexander

Figure 1. Mason Senior Michael Rollins slowly submerges his macroinvertebrate bottle trap with assistance of PEREC team member Heather Nortz in Gunston Cove, VA

You would never think that drinking 16 liters of soda would be key to being an ecologist. I didn’t either. As a George Mason University senior, finishing my degree in environmental science with a concentration in marine, estuarial, and freshwater ecology, I am participating in an OSCAR undergraduate summer research project.

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