Tag Archives: Native species

Alien-looking blob discovered in southern Michigan lake

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This alien-looking blob was found attached to a pontoon boat. Photo by C. Daly.

By Jo Latimore, Michigan State University Extension

 

As an aquatic ecologist at Michigan State University who works closely with Michigan State University Extension, I receive a lot of emails and phone calls about mysterious or unusual discoveries in Michigan lakes. I enjoy responding to them, because it gives me a chance to chat with Michigan residents about all sorts of interesting aquatic phenomena.

 

This story begins with one of those messages. A boat owner pulled their pontoon out of Juno Lake (Cass County, in southern Michigan), and discovered a weird, alien-looking, gelatinous blob attached to it below the water line. Was it an invasive species? Toxic algae? Eggs of an alien from outer space!? They contacted a friend on a neighboring lake who happens to be a volunteer in our statewide Cooperative Lakes Monitoring Program, and she reached out to me with a photo and inquiry about the aquatic oddity. I was excited to let her know that they’d discovered a colony of bryozoans!

 

Meet the bryozoans — tiny aquatic organisms that live in colonies. They are filter-feeders, relying on floating bits of food in the water for nourishment. You can view the waving tentacles of a microscopic bryozoan individual on this video. There are many saltwater species of bryozoans, but only a few are native to freshwater lakes. The freshwater bryozoan species that makes blob-like colonies is Pectinatella magnifica. These colonies often form attached to structures like rocks, logs, and — as was the case in Juno Lake — on boats left in the water for a while. Colonies begin to form in the spring, and are most frequently noticed in late summer and fall, when they reach their largest size. Colonies are usually only a few inches across, but can grow to a foot wide or more in the right conditions.

 

Bryozoan colonies attached to the underside of a pontoon boat pulled from Juno Lake, Cass County, Michigan. Bryozoans are harmless, tiny, filter-feeding aquatic invertebrates that can form jelly-like colonies on solid surfaces. Photo by L. Mroczek.

Still, most Michigan residents have never seen a bryozoan colony before, since they are underwater and often small in size. It’s not surprising, then, that these jelly-like, alien-looking blobs raise concern and worry when they are spotted. Luckily, these native species are harmless to humans (although they do occasionally clog pipes). Even better, they are indicators of good water quality, since they depend on healthy waters to survive.

 

To learn more about freshwater bryozoans, check out the Missouri Department of Conservation’s excellent web article. If you find an aquatic oddity in Michigan and aren’t sure what it is, take a picture or two and post it using the  Ask an Expert link on the Michigan State University Extension website.

 

This article was published by Michigan State University Extension. For more information, visit http://www.msue.msu.edu. To have a digest of information delivered straight to your email inbox, visit http://www.msue.msu.edu/newsletters. To contact an expert in your area, visit http://expert.msue.msu.edu, or call 888-MSUE4MI (888-678-3464).

 

 

Keep classroom pets out of the wild

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Courtesy Michigan State University Extension

By Paige Filice, and Tara Eavy, Michigan State University Extension

 

Some of the most memorable moments in the classroom are the ones shared with the class hamster, fish, gecko or other animal. Pets enrich classroom learning by teaching responsibility and sensitivity towards living things. A student exposed to animals in the classroom may have higher self-esteem, nurturing skills, social skills and interest in attending class. Integrating animals into the curriculum also encourages a greater appreciation for the complexity of life. Use of live animals helps students develop observation and comparison skills as they study the shared and unique traits of specific organisms.

 

Classroom pets enable educators to teach responsibility towards not only living creatures, but also their habitats and Michigan’s ecosystems. To demonstrate that responsible behavior, teachers should take steps to prevent the release of classroom fish, plants or other animals into the wild. As the National Science Teachers Association recommends, teachers should “refrain from releasing animals into a non-indigenous environment.” Many non-native plants and animals are used in the classroom, and some can become invasive in the wild. Once introduced, they can disrupt the food chain and out-compete native species for food and habitat. Even those that are ill-equipped to survive our Michigan winters can cause harm while alive, and can introduce disease to our native flora and fauna.

 

Some of Michigan’s notorious invaders, such as rusty and red swamp crayfish, have been kept as learning aids in classrooms. Crayfish are fun to watch and are easy to feed and care for, making them ideal additions to an aquarium. They play an important role in aquatic food chains as scavengers, cleaning up dead plants and animals for their food. However, both red swamp and rusty crayfish are now illegal to possess in Michigan and unfortunately are difficult to identify when young and can be accidentally sold by biological supply companies and pet stores by mistake to teachers. These crayfish compete aggressively with native species for food and habitat and can even reduce shoreline habitat and decrease water quality due to their aggressive burrowing. Both species have been found in the wild in Michigan and were likely introduced from an aquarium that was released into a river or stream.

 

Therefore, as we come to the end of the school year, it is important to be aware of alternatives to releasing classroom animals and plants into the wild. Even native species of crayfish, fish and birds that are caught in the wild and brought into the classroom for learning, should never be re-released into the wild because of their potential as vectors for disease. Investigate loaning or giving them to dedicated hobbyists, environmental learning centers, aquariums or zoos. Unwanted fish, plants and animals can often be returned to local, independent retailers, but be sure to inquire before arriving with a bucket full of fish! If unable to find a home for your classroom pets, contact a veterinarian or pet retailer for guidance on humane disposal.

 

Michigan’s invasive species education initiative, RIPPLE (Reduce Invasive Pet and Plant Escapes) was developed by Michigan State University Extension and adopted by the Michigan Departments of Natural Resources, Environmental Quality and Agriculture and Rural Development. Through RIPPLE, educators can request free materials on invasive species that can be used in the classroom. More information about invasive species, regulations and prevention can be found on the State of Michigan invasive species website.

 

This article was published by Michigan State University Extension. For more information, visit http://www.msue.msu.edu. To have a digest of information delivered straight to your email inbox, visit http://www.msue.msu.edu/newsletters. To contact an expert in your area, visit http://expert.msue.msu.edu, or call 888-MSUE4MI (888-678-3464).