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Lake Guardian Shipboard and Shoreline Science Workshop  Report Out From Day 2!

2011 July 25
Teachers on the back deck learning about sampling

Teachers on the back deck learning about sampling

By Kristin TePas

In July 2011, scientists and educators from around the Great Lakes will be aboard EPA’s Lake Guardian research vessel to research environmental conditions in Lake Superior, and share their stories.

Science Workshop, Day#2 Report Out

Let the research begin! We did our first sampling station Thursday at the Coordinated Science and Monitoring Initiative (CSMI) site.  The teachers rotated through each piece of sampling equipment and each gained hands-on experience helping out the scientists and marine technicians.

We first deployed the Rosette to collect water samples for water quality analysis.  The Rosette has a central cylinder where a sensor package is located and clustered around that package are sampling bottles. For more on Rosette samplers.  Water samples were collected at different, discrete depths throughout the water column. To determine the discrete sampling depths, temperature is used by measuring the thermal stratification the term for the temperature layering effect that occurs in water) of the lake. In the summer months there is a distinct warmer upper layer called the epilimnion (e.g., 12-15C) with a rapidly decreasing layer beneath leading to a uniform colder layer called the hypolimnion (e.g., 4 C).

Teacher hosing down zooplankton net

Teacher hosing down zooplankton net

We next deployed phytoplankton and zooplankton nets to collect algae and zooplankton.

Phytoplankton were collected from the upper productive layer of the water column, while zooplankton were collected throughout the water column. Scientists will analyze the abundance and composition of these communities because as the base of the food chain, they support the entire system!
We then collected sediment using a PONAR grab sampler which was named after Great Lakes scientists, Charles E. Powers, Robert A. Ogle, Jr., Vincent E. Noble, John C. Ayers, and Andrew Robertson.

This sampler allows us to examine the benthic zone, or the lowest level of the lake’s ecosystem. With these samples, grabbed

Teachers transferring zooplankton sample into bottle

Teachers transferring zooplankton sample into bottle

from the lake bottom, scientists will look at the benthic organisms that live in the sediment, total organic carbon and plastics. The collection of plastics is for Dr. Rios-Mendoza (University of Wisconsin-Superior), who is studying the abundance and composition of plastics polymers in aquatic environments.

The teachers will get plenty of experience using the equipment and processing samples as we’ll be sampling at many more CSMI sites over the next several days!

PONAR sampler

PONAR sampler

Got a question about the equipment? Then send a question to the Lake Guardian mailbag for our experts to answer!

About the author: Kristin TePas works with IL-IN Sea Grant as an outreach specialist and is a liaison to U.S. EPA’s Great Lakes National Program Office.

Editor’s Note: The opinions expressed in Greenversations are those of the author. They do not reflect EPA policy, endorsement, or action, and EPA does not verify the accuracy or science of the contents of the blog.

Editor's Note: The opinions expressed here are those of the author. They do not reflect EPA policy, endorsement, or action, and EPA does not verify the accuracy or science of the contents of the blog.

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5 Responses leave one →
  1. Ben permalink
    July 25, 2011

    This is novel work for the environment

  2. permalink
    July 26, 2011

    VERY impressive! I am looking forward to checking these all out – what a great way to get the word out about all the helpful information you have to share! I’m planning an upcoming “blog tour” to help promote my blog… any tips for getting so much writing done?

  3. Chris permalink
    July 26, 2011

    Lol, looked like a fun day out xD, The pictures throughtout this article caught my attemtion lol, ive never been fishing in my life, let alone fishing for research and experiments. Is it fun?


  4. Anonymous permalink
    July 26, 2011

    Hi Chris,
    It’s been a rigorous week but lots of fun! I’ll paraphrase one of the teachers who said this experience is like fantasy camp for science teachers. Many of them studied science in college but have been in the classroom ever since so are enjoying getting out in the field and conducting real research.
    (Kristin TePas, IL-IN Sea Grant/EPA)

  5. lsat permalink
    August 1, 2011

    Wow,sure the students or people enjoy and have fun fishing for research and experiments.It really great getting out in the field to conduct real research.Thanks alot for sharing such a great infromation and article!Love to read this post alot!God bless you.Amen

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