Lake Tides - The newsletter for people interested in Wisconsin Lakes
- a quarterly publication of the University of Wisconsin-Extension Lakes Program - part of the Wisconsin Lakes Partnership.

A Long Winter's Nap: Amphibians and Reptiles Sleep It Off
Hats Off to Crew V
Mixing Milfoil: Eurasian & Northern Water Milfoil Create a Hybrid
AIS Workshop Opportunity
Grant Rules: Guides for Aquatic Invasive Species Control Grants
Help With Your Newsletter
2005 Wisconsin Lakes Convention: Water In Our Veins: Celebrating Lake Volunteers (link to general Convention page)
Calendar
Reflections

A Long Winter's Nap:
Amphibians & Reptiles Sleep It Off

Beneath the frozen surface of Wisconsin’s lakes and in the snow-covered forests and swamps sleeps a very cool community of amphibians and reptiles. Their disappearance is hardly noticed for it is easy to forget about these silent "cold-blooded" critters during the winter months. But they are biding their time, quietly waiting out the months when frigid air and water temperatures slow their metabolic rate to a standstill. Hibernation (from the Latin word hiberna meaning "winter") is the word used to describe the wintertime

inactive stage of both warm-blooded and cold-blooded animals. Amphibian and reptile hibernation (sometimes called "brumation") is possible because of marvelous adaptations. Some amphibians and reptiles are even able to withstand freezing! How do they cope with these severe winter conditions? Not every Wisconsin amphibian or reptile species overwinters in the same way, but there are some general patterns.

As autumn sunlight dwindles and temperatures start to fall, frogs such as the leopard frog, green frog, and mink frog feel the urge to swim to the bottoms of ponds and lakes. They rest on the bottom or may even partially burrow into the mud. Their highly specialized skin allows them to breathe by taking in oxygen through their skin and giving off carbon dioxide in the same way. The moist film on their thin skin allows respiratory gases to dissolve and diffuse in and out of the blood capillaries. These deepwater hibernators need to have water deep enough so that the ice will not freeze all the way to the bottom and the water must contain just enough dissolved oxygen to meet their needs. Their metabolic rates are so low that they do not feed, but very slowly use a reserve of stored energy.

Occasionally there are "winter kills" of frogs where the oxygen levels at the pond bottom are insufficient to sustain them.

Another Wisconsin amphibian that spends winter in deep water is a large aquatic salamander called a mudpuppy. Unlike some frogs, this strange looking
amphibian remains relatively active and even feeds during the winter. People ice-fishing occasionally catch them!

Reptiles such as the painted turtle, snapping turtle, and Blanding’s turtle also spend their winters under deep water. They too require oxygen, but their skins are not as capable of exchanging gases as the amphibians. A turtle survives this dilemma by taking water into its mouth and cloaca (the termination of the urinary and digestive systems). Here, the skin lining the throat and cloaca is capable of exchanging enough oxygen and carbon dioxide to sustain the low metabolism.

Some amphibians hibernate on land by digging their way down below the frost line to avoid freezing. In autumn, the American toad burrows his way down by pushing earth with his hind feet. Down, down, down to three feet or more. The spotted, blue-spotted, and tiger salamanders go deep too, but they tend to use abandoned burrows or other natural holes. These salamanders are sometimes called "mole salamanders" because of their propensity to use burrows. Once they are deep enough, they go dormant and wait until the warming soils of spring signal the end of their rest. These deep-soil hibernators, like the deep-water hibernators share a common trait: if they freeze they die. Changing climates with less snow to insulate the soil, and cold temperatures could impact these deep-soil hibernators.

A few frogs native to Wisconsin have the amazing ability to withstand freezing. The wood frog, chorus frog, spring peeper, gray treefrog, and Cope’s gray treefrog can simply freeze solid! As late fall approaches, individuals of these species lay on the forest floor, under leaves and debris. When the temperatures dip for extended periods to below freezing, much of the water in their bodies (more than fifty percent) will freeze. During this time the frog does not breathe nor does its heart beat. Brain activity is immeasurable. The frog appears to be dead and rock-solid. Despite this apparently terminal condition, as temperatures warm, the frog awakens to spring. This feat is accomplished by an intricate metabolic process that results in high levels of sugars and sugar alcohols in the frog’s tissues. This sugary mix acts as an antifreeze agent protecting the delicate cells in the body. Ice forms around the outsides of the frog’s organs, but the thicker fluid in the individual cells does not freeze, and the fragile cellular structures remain intact.

As scientists have studied the freeze tolerance phenomenon, they’ve discovered that some reptiles also have this capability. Delicate hatchling painted turtles overwinter on land by surviving freezing. Garter snakes are freeze tolerant too, although they are not quite as hearty as their amphibian cousins when it comes to long bouts of freezing. Of course, a huge variety of invertebrate animals (such as insects, spiders, and slugs) are freeze tolerant, but that’s another article.

As you sit in front of a warm fire in your den this winter, take a moment to marvel at how amphibians and reptiles pass their time during this frigid season. Before long, the first spring peeper choruses will alert us that the season has changed. Leopard frogs will once again snag passing damselflies and painted turtles will crawl up on logs to capture the sun’s warmth. Their adaptations have allowed survival through another long season of freezing temperatures.

www.white-water-associates.com

Dean has a doctorate degree in zoology with an emphasis in herpetology (the study of amphibians and reptiles). With his wife and two children, Dean performs folk and traditional music as the family band White Water.

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Hats Off to Crew V

Crew members of the fifth Wisconsin Lake Leaders Institute completed their training this fall with a memorable graduation at the Aldo Leopold Shack near Baraboo. DNR Secretary Scott Hassett, Interim Dean of UW-Stevens Point College of Natural Resources Christine Thomas, and WAL vice president Jim Abbs all attended the graduation.

This group of lake stewards spent six days together over the past year learning about lake ecology, local and state government, and leadership skills.

Since its inception, 160 participants have graduated from the Lake Leaders Institute and have made significant contributions in resolving a host of diverse water management issues.

Meet these Crew V graduates and other lake leaders at this year’s Lakes Convention in Green Bay. More about the Lake Leaders Institute and those who have participated in Crews I through V can be found online at www.uwsp.edu/cnr/uwexlakes/lakeleaders/.

Join us in congratulating these special leaders of Crew V who are willing to make a commitment to Wisconsin lakes, participate in the decision-making and assist with our state’s water issues...

Larry Bresina, LeAnn Colburn, Lisa Conley, Dennis Cullen, Reesa Evans, Ann Heuschele, Derek Hoffman, Mary Jo Knauf, Mary Knipper, Chris Krieg, Terri, Lyon , Sam Lewis, Emily Lund, Barry McLeane, Paul Maulberg, Meg Marshall, Peter Murray, Cyndi Neeb (Crew IV), Jim Neeb (Crew IV), Don O’Keene, Dave O’Malley, Marlo Orth, Gordon Philip, Scott Porter, Carolyn, Scholl, Teresa Scollon, Susan Sharkey, Dennis VanderWerff

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Mixing Milfoil: Eurasian & Northern Water Milfoil Create a Hybrid

Researchers know that water milfoils produce seeds, but they believe that most of these seeds do not germinate. It is considered even less likely that a seedling would live long enough to produce a viable plant. Somewhere, somehow, Northern water milfoil and Eurasian water milfoil cross-pollinated and viable seeds were produced. Thus a hybrid plant came into existence.

Researchers do not know where this hybridization took place or how it is spreading. DNA testing in 36 Wisconsin lakes found the hybrid living in sixteen of them. In the case of Pine Lake in Forest County, it has probably been there for years. The hybrid does not seem to be aggressive and is not forming large beds.

Since water milfoil spreads via plant fragments, we may be transporting hybrid fragments from one lake to another or maybe the hybridization is occurring in many lakes at the same time. If all the hybrids are of the same genetic stock, it would be convincing evidence that the plant is being spread via transportation as a fragment. If there is genetic variability in the hybrids, it would lead us to believe hybridization is happening on its own in different lakes.

DNA testing is the only sure way to tell if you have the hybrid milfoil. The hybrid does not canopy like EWM. In fact, researchers have not found specific characteristics that fit only the hybrid – it seems to have a combination of characteristics of both parent plants. Because of factors that can be unique to an individual lake such as nutrient levels, water clarity, and water depth, even the same species of water milfoil often look different from lake to lake. To make it even more confusing, water milfoils, like many plants, display variances even on the same plant. Looking at a single water milfoil plant you will find that the leaves often have different counts of leaflets depending upon where you pull the leaf from the stem. It is quite common for the lower leaves to have fewer leaflets per leaf. That is why there are ranges on leaflets in the plant taxonomy keys. EWM has leaves with "more than" 12 leaflets on each side of the leaf. Northern water milfoil has "11 or fewer" leaflets on each side of the leaf. These are general guidelines, however, and you can certainly find Eurasian water milfoil plants with less than 12 leaflet pairs and Northern water milfoil plants with more than 11 leaflet pairs per leaf.

We will need more studies to better understand the hybrid. Researchers will look at the effect of chemicals on the hybrid, how easily EWM plants cross-breed with Northern water milfoil, and if the water milfoil weevil will control the hybrid. We do not know if the hybrid is more or less aggressive than the native Northern water milfoil. History has shown that human impacts on aquatic systems (such as the introduction of EWM) can have major consequences…with luck this milfoil hybrid will prove harmless.

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AIS Workshop Opportunity

To address this need, the Wisconsin Lakes Partnership is
offering workshops through their Clean Boats, Clean Waters Volunteer Watercraft Inspection Program. In 2004, over 350 volunteers were trained to perform watercraft inspections to educate boaters on how and where invasive species are most likely to hitch a ride into waterbodies.

For more information about the Clean Boats, Clean Waters Watercraft Inspection Program visit www.uwsp.edu/cnr/uwexlakes/CBCW. For more information on the following workshops contact Laura Felda-Marquardt at Laura.Felda@dnr.state.wi.us or 715-365-2659.

April 9 - Spooner, 8:30am-noon, Agriculture Research Station, Washburn County

April 13 - Crandon, 6-9pm, Crandon Library, Forest County

April 16 - Barnes, 8:30am-noon, Barnes Town Hall, Bayfield County

April 23 - Mercer, 8:30am-noon, Mercer Community Center, Iron County

April 28 - Green Bay, 6-9pm, KI Convention Center, Brown County (see page 14)

April 30 - Green Bay, 8-11am, KI Convention Center, Brown County (see page 14)

May 4 - Manitowish Waters, 6-9pm, North Lakeland Elementary School, Vilas County

May 10 - Rhinelander, 6-9pm, Nicolet College, Oneida County

May 14 - Ashland, time TBA, Great Lakes Visitor Center, Ashland County

May 17 - Amherst Junction, 5-8:30pm, Lake Emily County Park, Portage County

May 19 - Elkhorn, 4-7:30pm, Government Center, Walworth County

May 21 - Waukesha, 8:30am-noon, DNR Service Center, Waukesha County

May 26 - Eagle River, 6-9pm, Northland Pines Middle School, Vilas County

June 2 - Minocqua, 6-9pm, Nicolet College-Lakeland Campus, Oneida County

June 11 - Florence, 8:30am-noon, Resource Center, Florence County

June 16 - Madison, 2-5pm, location TBA-Big Splash Angler Ed. Program, Dane County

June 18 - Barron, 8:30am-noon, location TBA, Barron County

June 21 - Eagle River, 1-4pm, Trees For Tomorrow-Big Splash Angler Ed. Program, Vilas County

June 23 - Cable, 1:30-5pm, Telemark Lodge-Northwest WI Lakes Conference, Bayfield County
July 9 - Ladysmith, 8:30am-noon, location TBA, Rusk County

Additional workshops may be added, please check the website for the latest details:
www.uwsp.edu/cnr/uwexlakes/CBCW.

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Grant Rules: Guides for Aquatic Invasive Species Control Grants

To assist in guiding the work that will be done with these grant dollars, rules are now in place which will help people interested in managing invasive species in their lakes or rivers. The Wisconsin legislature directed the Department of Natural Resources (DNR) to write rules (NR 198) that establish procedures to award cost-sharing for Aquatic Invasive Species Control Grants. These grants are available to public and private entities for up to 50% of the costs of projects to control invasive species. These monies are available to conduct projects on all waters of the state, including lakes, rivers, streams, wetlands and the Great Lakes. The grant projects are broken down into three major groupings:

Any entity that is eligible for a Wisconsin Lake or River Planning or Protection Grant is also eligible for an AIS Control Grant. This includes units of local government, tribes, lake protection and rehabilitation districts, qualified lake associations, qualified river management organizations, nonprofit conservation organizations and qualified school districts. However, first priority will go to units of local government.

The state will pay up to 50% of the cost of a project, with caps of:

The remaining 50% must be provided by the local organization in the form of cash, time, services, or "in-kind" items. These grants operate on a reimbursement basis.

Applications

Applications for education, prevention and planning projects and established infestation control projects are due by the first of February and August of each year. Early detection and rapid response grants are offered continuously on a first-come, first-served basis, funded in order of approval.

More detailed information on lake Grants can be found at http://dnr.wi.gov/org/caer/cfa/grants/Forms/LakesGuidelines2004.pdf

The DNR can provide help with applications and technical guidance. Private consultants can also assist you. A list of consultants, without endorsements, can be obtained from UW-Extension, College of Natural Resources, University of Wisconsin, Stevens Point, WI 54481

www.uwsp.edu/cnr/uwexlakes/lakelist/ (715/346-2116 or uwexlakes@uwsp.edu) or your DNR Regional Lakes Coordinator.

There are many types of projects that qualify for the Aquatic Invasive Species (AIS) Control Grants. The following list gives you a flavor of what they might be. Details and the actual rule (NR 198) can be found at the UWEX Lakes website at
www.uwsp.edu/cnr/uwexlakes/law

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Help With Your Newsletter

Are you always looking for good articles and pictures for your lake newsletter? Check out the UWEX Lakes website at www.uwsp.edu/cnr/uwexlakes and click on Editor’s Corner. You will find dozens of articles from past issues of Lake Tides, photos and website resources for your use. Also feel free to call our staff if you have questions about newsletters.

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Calendar

Reflections

Editors: Mary Pardee, Robert Korth, Tiffany Lyden
Design Editor: Amy Kowalski
Contributing Editor: Carroll Schaal, DNR
Photos by: Robert Korth (unless otherwise noted)
Illustrations by: Carol Watkins, Chris Whalen

The contents of Lake Tides do not necessarily reflect the views and policies of UW-Extension, UWSP-CNR, the Wisconsin DNR or the Wisconsin Association of Lakes. Mention of trade names, commercial products, private businesses or publicly financed programs does not constitute endorsement. Lake Tides welcomes articles, letters or other news items for publication. Articles in Lake Tides may be reprinted or reproduced for further distribution with acknowledgment to the Wisconsin Lakes Partnership. If you need this material in an alternative format, please contact our office. No state tax revenue supported the printing of this document.

We welcome you to use any of these articles for your newsletter.  Please credit the source.

Contact us at uwexlakes@uwsp.edu if you have questions.

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 The newsletter for people interested in Wisconsin lakes