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In this episode of Ask an Expert, Illinois-Indiana Sea Grant‘s aquaculture marketing outreach associate Amy Shambach and Purdue Aquaculture Lab Manager Bob Rode share more about aquaculture, a growing method to increase the food supply.

If you have any questions regarding trees, forests, wildlife, wood products or other natural resource topics, feel free to contact us by using our Ask an Expert web page.

Resources
Aquaculture Research Lab, Purdue Forestry and Natural Resources
Local Farmers, Local Fish: Shrimp, Video, Purdue Extension YouTube channel
Aquaculture Industry in Indiana Growing, Video, Purdue Agriculture YouTube Channel
Aquaponics, Video, Purdue University YouTube channel
Aquaculture: Cage Culture, Video, Purdue University YouTube channel
Eat Midwest Fish
Indiana Department of Natural Resources Commercial Fish Suppliers Database
IN Fish Stocking, Indiana Department of Natural Resources (IDNR)
Fish & Wildlife Properties – State Fish Hatcheries, IN DNR
Indiana Aquaculture Association
North Central Regional Aquaculture Center (NCRAC)
Southern Regional Aquaculture Center (SRAC)
Commercial Fisher Suppliers, IN DNR
Indiana Fish Entry Requirements, Indiana State Board of Animal Health

Amy Shambach, Aquaculture Marketing Outreach Associate
Purdue Department of Forestry and Natural Resources/Illinois Indiana Sea Grant Program

Bob Rode, Extension Aquaculture Specialist
Department of Forestry and Natural Resources, Purdue University

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The Nature of Teaching Extension program includes formal standards-based curricula and informal activity-based curricula, all centered around getting youth outside. Topics included are Food Waste, Health & Wellness, and Wildlife. Each program area provides standards-based, classroom-ready, free lesson plans with downloadable PDFs.

The resources keep growing with now opportunities to take the virtual workshops and receive a certificate of completion. The webinars include all the links to the material for K-12 curriculum and activities available. Whether you are a teacher, natural resource leader or a 4-H leader you have the opportunity to use the prepared curriculum with fun activities while teaching K-12 youth about natural resources, conservation, and the environment.

Resources
Virtual Workshops, Nature of Teaching
Nature of Teaching, Website, Purdue College of Agriculture
The Nature of Teaching, YouTube channel
Transporting Food Waste, The Education Store, Purdue Extension resource center
Benefits of Connecting with Nature, The Education Store
Nature of Teaching: Common Mammals of Indiana, The Education Store

Rod Williams, former Professor of Wildlife Science & Wildlife Extension Specialist
Purdue University Department of Forestry and Natural Resources

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You may have found salamanders while flipping over rocks and logs in the woods or you may have seen them scurrying in and out of your pond. In this episode of FNR Ask the Expert, join Dr. Rod Williams, extension specialist Nick Burgmeier and IU Northwest’s Dr. Spencer Cortwright as they discuss all things salamander, including the different species as well as some threats to these amazing amphibians.

If you have any questions regarding trees, forests, wildlife, wood products or other natural resource topics, feel free to contact us by using our Ask an Expert web page.

Resources
Ask An Expert, Playlist, Purdue Extension – Forestry and Natural Resources YouTube channel
Help the Hellbender, Purdue Extension – FNR Playlist
A Moment in the Wild, Purdue Extension – FNR Playlist
The Nature of Teaching: Adaptations for Aquatic Amphibians, The Education Store, Purdue Extension resource center
How Our Zoos Help Hellbenders, The Education Store
Help the Hellbender, Website, Purdue College of Agriculture

Rod Williams, Professor of Wildlife Science
Purdue University Department of Forestry and Natural Resources

Nick Burgmeier, Research Biologist and Wildlife Extension Specialist
Purdue Department of Forestry and Natural Resources

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The publication Yellow Perch is the second in a series of fact sheets that describe fish and shellfish produced in the Midwest region of the United States. (See FNR-608-W, Walleye Farmed Fish Fact Sheet.) Yellow perch have been popular among anglers for many years, and since 2002, responding to greater demand, U.S. farmers are raising perch in ponds, aquaponic systems, etc. The fact sheet also includes culinary characteristics, cooking tips, and a recipe for Baked Parmesan Perch.

View other seafood publications and video resources as you place keywords in the search field located on The Education Store website.

Resources
Fish: Healthy Protein Handout, The Education Store, Purdue Extension resource center
Walleye Farmed Fish Fact Sheet: A Guide for Seafood Consumers, The Education Store
Fish Cleaning with Purdue Extension County Extension Director, Got Nature? Blog, Purdue Extension – Forestry and Natural Resources
Eat Midwest Fish, Website
Sustainable Aquaculture: What does it mean to you?, The Education Store, Purdue Extension resource center
Best Practices Guide for Charter Fishing and COVID-19, The Education Store
Pond Management: Managing Fish Populations, The Education Store
Aquatics & Fisheries, Playlist, Purdue Extension – Forestry and Natural Resources

Amy Shambach, Aquaculture Marketing Outreach Associate
Purdue Department of Forestry and Natural Resources/Illinois Indiana Sea Grant Program

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Join this Ask An Expert Live session and learn about snakes and turtles, their natural history, interesting research happening in Indiana, and why you don’t need to worry about water moccasins in your pond!

Date: April 1st, 2021
Time: 12 p.m. EST.
Speaker: Dr. Rod Williams, Professor of Wildlife Science, Purdue Forestry and Natural Resources; Dr. Bruce Kingsbury, Director of the Environmental Resource Center, Purdue Fort Wayne; Dr. Vicky Meretsky, Director of the Environmental Master’s Programs, Indiana University Paul H. O’Neill School of Public and Environmental Affairs
Contact: Diana Evans, Extension and Web Communications Specialist, evans44@purdue.edu

For the Facebook live link and more information, visit Purdue Forestry and Natural Resources Facebook event page.

Resources
Turtles of Indiana, The Education Store, Purdue Extension resource center
Snakes of the Central and Northeastern United States, The Education Store
Snakes of Indiana, The Education Store
Indiana Amphibian and Reptile ID Package (4 softcover books), The Education Store
Reptiles: Turtles, Snakes, and Lizards​​, Purdue Nature of Teaching Website
Ask An Expert, Playlist, Purdue Extension – Forestry and Natural Resources YouTube channel
A Moment in the Wild: Eastern Hognose, Purdue Extension – FNR Video
A Moment in the Wild: Eastern Kingsnake, Purdue Extension – FNR Video
A Moment in the Wild: Racer, Purdue Extension – FNR Video

Rod Williams, Professor of Wildlife Science
Purdue University Department of Forestry and Natural Resources

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In this edition of ID That Tree, Purdue Extension forester Lenny Farlee introduces you to chestnut oak, sometimes called rock chestnut oak. It is an oak species commonly found in the southern part of the state on high dry sites. It has small, very rounded lobed leaves and strongly ridged, very dark bark.

If you have any questions regarding trees, forests, wildlife, wood products or other natural resource topics, feel free to contact us by using our Ask an Expert web page.

Resources
Chestnut Oak, Native Trees of Indiana River Walk, Purdue – Fort Wayne
Quercus Montana, The Purdue Arboretum Explorer
ID That Tree, Playlist, Purdue Extension – Forestry and Natural Resources Youtube Channel
A Woodland Management Moment, Playlist, Purdue Extension – Forestry and Natural Resources Youtube Channel
Investing in Indiana Woodlands, The Education Store
Tree Appraisal and the Value of Trees, The Education Store
Forest Improvement Handbook, The Education Store

Lenny Farlee, Sustaining Hardwood Extension Specialist
Purdue University Department of Forestry and Natural Resources

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Purdue Landscape Report: So, what do trees do in the winter? Do they freeze up like unprotected water pipes? Or burst when it gets below freezing? Yes, the below-ground parts of a tree are kept insulated by mulch, soil and a layer of snow, and that is important to survival, but the exposed parts of a tree are not protected.

Deciduous trees, like maples and oaks, have a lot of water inside their trunks and branches. Water is the single most important substance for tree life, comprising nearly 80% of tree material. Although there is a little less inside the tree during the winter, if the temperature drops low enough, the water in even the most cold-hardy tree will freeze. Broadleaf, deciduous trees lose their leaves in the winter to reduce water loss inside the trunk and branches. Most needle-leaved trees, known as conifers, which include pines and spruce, retain needles year-round – with exceptions of some deciduous evergreens such as larch and bald cypress– only losing older, or damaged needles. Needles are better at retaining water than broadleaves due to their small surface area and waxy outer coating limiting water loss to transpiration, the evaporation of water from leaves. A hard freeze or poorly timed drop in temperatures can be devastating to living tree cells since ice crystals can shred cell membranes, leading to dead leaves, branches, and even whole trees. Most trees live through the winter despite prolonged exposure to brutally cold air and wind and snow, with special strategies and planning.

Dormancy of trees can be divided arbitrarily into three phases: early rest, winter rest, and after-rest. Each of these phases is marked by a distinct set of physiological processes. The transition between the three phases is gradual and there are many metabolic and developmental processes going on in the buds and twigs. A tree begins its preparations in late summer as day length shortens to survive winter temperatures. Cold acclimation occurs gradually and fall color is a sign that the process is in place and pre-dormancy is beginning.

When the tree enters the winter rest stage, research suggests three basic ways in which a tree prevents freezing. One is to change their membranes, so the membranes become more pliable; this allows water to migrate out of the cells and into the spaces between the cells. The relocated water exerts pressure against the cell walls, but this pressure is offset as cells shrink and occupy less space.

The second way a tree helps prevent freezing is to thicken the fluids within the cells. When days begin to get shorter, trees convert starch to sugars, which act as a natural antifreeze for the plant. The cellular fluid within the living cells becomes concentrated with natural sugars, which lowers the freezing point inside the cells, while the water between the cells is allowed to freeze. Because the cell membranes are more pliable in winter, they’re squeezed but not punctured by the expanding ice crystals.

The third mechanism involves what has been described as a “glass phase,” where the liquid cell contents become so viscous that they appear to be solid, a kind of “molecular suspended animation” and mimic the way silica remains liquid as it is supercooled into glass. This mechanism is triggered by the progressive cellular dehydration that results from the first two mechanisms and allows the supercooled contents of the tree’s cells to avoid crystallizing.

All three cellular mechanisms are intended to keep living cells from freezing. That’s the key for the tree; don’t allow living cells to freeze.

A tree doesn’t have to keep all of its cells from freezing, just the living ones which are primarily the phloem cells. This is significant, since much of a tree’s living trunk is made up of cells that are dead, such as xylem cells. These dead cells can and do freeze, but even the lowest temperature doesn’t have an adverse effect. While a majority of a tree’s above-ground cells do indeed freeze regularly when exposed to subfreezing temperatures, the living cells remain unfrozen and active on a reduced level. There are living cells in the trunk that remain unfrozen even though they are right next to – and at the same temperature as – dead cells that are frozen solid!

This seemingly mystical combination of pliable membranes, natural antifreeze, and glasslike supercooling, with frost on the outside and viscous dehydration on the inside, helps trees avoid freezing injury to living cells. Trees are the largest, oldest living organism on our planet and don’t grow older and larger without having very specific strategies for survival.

However, sometimes, trees aren’t able to withstand extreme conditions, especially if nature provides an unusual change.  While trees have evolved amazing strategies for withstanding the winter cold, sometimes it gets so cold that trees can explode. During spells of extreme cold or especially when trees haven’t had time to acclimate before the cold arrives, the life-sustaining sap inside a tree can begin to freeze. Sap contains water so it expands when frozen, putting pressure on the bark, which can break and create an explosion, so to speak.

Proper winter care is critical to protect your trees with mulch and water to help trees make it through the winter months. For more information on winter tree care, check out this publication: Winterize Your Trees.

Resources
Purdue Landscape Report, Website
Winterize Your Trees, The Education Store, Purdue Extension resource center
Tree Defect Identification, The Education Store
Forest/Timber, Playlist, Purdue Extension – Forestry and Natural Resources YouTube channel
Urban Forestry, Purdue Extension – FNR playlist
Winter Weather Tree Tips, Got Nature? Blog, Purdue Extension – Forestry and Natural Resources
Tree Wounds and Healing, Got Nature? Blog
Water Now to Minimize Winter Injury, Indiana Yard and Garden – Purdue Consumer Horticulture

Lindsey Purcell, Urban Forestry Specialist
Purdue University, Department of Forestry and Natural Resources

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Learn interesting facts about frogs and toads, their natural history, interesting research about the threats they face, and what can you do to help frogs?

Date: March 18th, 2021
Time: 3 p.m. EST.
Speaker: Dr. Rod Williams, Professor of Wildlife Science, Purdue Forestry and Natural Resources; Dr. Jason Hoverman, Associate Professor of Invertebrate Ecology, Purdue Forestry and Natural Resources; Dr. Michael Lannoo, Professor of Anatomy and Cell Biology, Indiana University School of Medicine
Contact: Diana Evans, Extension and Web Communications Specialist, evans44@purdue.edu

For the Facebook live link and more information, visit Purdue Forestry and Natural Resources Facebook event page.

Resources
Ask An Expert, Playlist, Purdue Extension – Forestry and Natural Resources YouTube channel
Frogs and Toads of Indiana, The Education Store, Purdue Extension resource center
Indiana Amphibian and Reptile ID Package (4 softcover books), The Education Store
Appreciating Reptiles and Amphibians in Nature, The Education Store
Amphibians: Frogs, Toads, and Salamanders, Purdue Nature of Teaching Website

Rod Williams, Professor of Wildlife Science
Purdue University Department of Forestry and Natural Resources

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In this edition of ID That Tree, Purdue Extension forester Lenny Farlee introduces the mockernut or white hickory. This species is typically found on high dry ridges and other dry soil locations. Identifying characteristics include a very rounded and oftentimes hairy buds, hair on the leaf stems and twigs in early spring and summer, and a tightly networked ridged and silvery bark.

If you have any questions regarding trees, forests, wildlife, wood products or other natural resource topics, feel free to contact us by using our Ask an Expert web page.

Resources
Hickory and Pecan Species, The Education Store, Purdue Extension resource center
Mockernut Hickory, Native Trees of Indiana River Walk, Purdue – Fort Wayne
ID That Tree, Playlist, Purdue Extension – Forestry and Natural Resources Youtube Channel
A Woodland Management Moment, Playlist, Purdue Extension – Forestry and Natural Resources Youtube Channel
Investing in Indiana Woodlands, The Education Store
Tree Appraisal and the Value of Trees, The Education Store
Forest Improvement Handbook, The Education Store

Lenny Farlee, Sustaining Hardwood Extension Specialist
Purdue University Department of Forestry and Natural Resources

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Join Purdue Extension fisheries expert Mitch Zischke and Purdue Extension – Ripley County extension educator Dave Osborne as they share about pond management, including how to create a management plan, getting things ready for spring, what to do about early season issues and more.

If you have any questions regarding trees, forests, wildlife, wood products or other natural resource topics, feel free to contact us by using our Ask an Expert web page.

Resources
Pond Management, Website, Purdue College of Agriculture
Pond University Podcast Series
Pond Management Plan Template, The Education Store, Purdue Extension resource center
Pond Fish Species Identification, The Education Store
Pond Fish Stocking, The Education Store
Fish Population Management, Website, Purdue College of Agriculture
Aquatic Plant Management, The Education Store
Ask An Expert, Playlist, Purdue Extension – Forestry and Natural Resources YouTube channel
Licensed Fish Hatcheries, Indiana Department of Natural Resources (IDNR)
County Resources for Ponds in Indiana, Purdue College of Agriculture
Feedback: Qualtrics survey

Mitch Zischke, Clinical Assistant Professor
Purdue Department of Forestry and Natural Resources

Dave Osborne, County Extension Director
Purdue Extension – Ripley County

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