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Smelling Feet or Smelly Feet?

3/7/2023

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Dorothy Hinshaw Patent​
 Nature’s Animal Ambassador

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     Do your feet sometimes smell rotten?  Do you wish you could toss out your shoes and start with a new pair?  We make jokes about smelly feet, but smell and feet have a very different relationship among some insects.

     Take butterflies.  Have you ever watched a butterfly flit over a plant, gently touch its feet to a leaf, and then fly on to the next leaf?  That butterfly isn’t being picky about where to land.  It’s hunting for the right kind of leaf for laying its eggs.  It’s “smelling” the leaf with its feet!

     Actually, we need to qualify that statement a bit.  Some writers will say the insect is “smelling” the leaf while others may write that it’s “tasting” the leaf.  Smelling and tasting are forms of “chemoreception,” or sensing of chemicals.  Smell usually refers to sensing from a distance while tasting generally means actually touching the nerve cells that sense a chemical.

     We humans have cells in our noses that send messages to our brains about chemicals in the air.  We call that our sense of smell.  We have cells on our tongues that sense chemicals dissolved in liquid in our mouths.  That’s taste.

     That butterfly doesn’t have a nose, and its mouth is a long tube for sucking up nectar from flowers.  Its chemoreceptors are elsewhere, like on its feet, around its mouth, and on its antennae.  Most butterflies lay their eggs on the plants that the hatched caterpillars will eat.  Some species are very specific about what plants their young can feed on.  Take the postman butterfly, which lives in Central and South America.  Its caterpillars can only survive on certain species of passionflower vines.  Other species are poisonous to their offspring.

     The female postman butterfly has dozens of special nerve cells on her feet called “gustatory sensilla.”  Scientists think that when she touches gently down on a leaf, these cells can sense chemicals there that would be poisonous to her caterpillars.  She avoids laying eggs on those leaves.  But when she finds a plant that will nourish her young, she’ll alight and lay her eggs.

     Now take your shoes off and move your feet around on the floor.  The only nerve endings on your feet are ones that sense touch.  But then, you don’t need to be able to smell the ground you walk on.  Imagine how gross it would be if your feet could smell the insides of your socks and shoes—yuck!
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In these photographs taken through a microscope, you can see the sensory sensilla (arrow) on the feet of the female butterfly on the right, which the male on the left doesn't have. From PLoS Genet. Jul 2013; 9(7): e1003620.
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Above: Postman butterfly feeding Right: Female postman butterfly laying an egg. As you can see from these two photos, the postman butterfly can have a variety of color patterns. From Heliconius.org
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A dog’s nose is 300 times more powerful than a human nose, so it’s no wonder that dogs use their incredibly advanced sense of smell to do some very important jobs. In Super Sniffers, Dorothy Hinshaw Patent explores the various ways specific dogs have put their super sniffing ability to use: from bedbug sniffers to explosive detectors to life-saving allergy detectors . . . and more. This dynamic photo-essay includes first-hand accounts from the people who work closely with these amazing dogs. For more information, click here.

Dorothy Hinshaw Patent  is a member of iNK's Authors on Call and is available for classroom programs through Field Trip Zoom,  a terrific technology that requires only a computer, wifi, and a webcam.  Click here to find out more.

MLA 8 Citation
Patent, Dorothy Hinshaw. "Smelling Feet or Smelly Feet?" Nonfiction Minute, iNK
     Think Tank, 23 Jan. 2018, www.nonfictionminute.org/the-nonfiction-minute/
     Smelling-Feet-or-Smelly-Feet.

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Monarchs of the West

1/25/2023

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​Dorothy Hinshaw Patent
 Nature’s Animal Ambassador


You may know that monarch butterfly populations east of the Rocky Mountains fly to sites in Mexico for the winter. But monarchs live in the west, too, and most of them overwinter in central and southern California.

One of the largest western overwintering sites is California’s Pismo State Beach Butterfly Grove. From late October through February, visitors can watch monarch butterflies clinging to the leaves and branches of giant eucalyptus trees.  The butterflies are in hibernation, feeding little if at all and with their internal systems slowed down.  The warmth of the sun wakes them partially, and some flutter from one spot to another.  When storms threaten, the monarchs cluster on branches inside the grove where the trees help break up the heavy rain and the power of high winds. 

Some may have left Canada in early September, arriving at the grove in October.  They may have traveled 2,000 miles at a rate of 100 miles a day, flying as high as 10,000 feet above sea level. But it’s worth the journey. In this grove are conditions that suit them well—relative warmth, humidity, light and shade, and moderate temperatures as well as protection from stormy weather.

As weather warms and days grow longer, the winter monarchs will mate, then begin the journey northward.  But these individuals don’t make it back home.  The females lay their eggs on milkweed plants, then die.  The eggs hatch into tiny caterpillars that grow so fast on their leafy diet that, as one website states, it’s like a human baby growing to the size of an adult gray whale in two weeks!  The caterpillar pupates and emerges later as a new butterfly which mates and travels further north.  This process continues for four or five generations, until summer fades with shortening days.   Then the next generation of winter monarchs hatches, repeating the cycle.  How does the information for this amazing cycle pass through the generations? No one knows.
​​
Unfortunately, the western population of monarchs has declined drastically in recent years.  Luckily, wherever you live, you can do things to help monarchs survive and thrive.  Visit this site for more information.

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This sign welcomed us into the Monarch Butterfly Grove.
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Most of the Monarchs alight in clusters on tree branches. This may look like a lot of butterflies, but the number of Monarchs in the western population has plummeted. An estimated 4.5 million western monarchs once overwintered along the California coast and Baja, Mexico. In 2017, 192,668 were counted in 263 sites, where only 28,429 were counted in 2018. There’s been a 99.4% decline in this population since the 1980s.
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Some of the Monarchs don’t join the others but perch alone, at least for a while.
The butterflies don't always stay in one place but flutter around now and then as you can see in this video.
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Dorothy's new book has had rave reviews including one by Vicki Cobb.  She went to Tasmania and saw what was happening.  Now you can read the story.

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Everything is Connected: The Butterfly Effect and the Wolf

12/20/2022

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Dorothy Hinshaw Patent

   Nature’s Animal Ambassador

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     Have you heard about the “butterfly effect,” the idea that one small change can bring about big changes over time?  This idea is important in the study of ecology, which deals with the interactions of living things and their environments.  Each element of an ecosystem has its place.  When one element is eliminated, it affects everything else.

     The Yellowstone ecosystem centered in Yellowstone National Park provides a great example.  Late in the 20th century, biologists were worried about the aspen trees there.  Aspens occur in clusters that are actually clones growing up from shared root systems.  Some of the Yellowstone clones were hundreds of years old, but the old, dying trees weren’t being replaced by strong young shoots.  It looked like they might just die out, and no one was sure why.

     When a severe drought in 1988 led to big wildfires in the park, the idea that fire might stimulate aspen growth proved wrong.  Perhaps the elimination of wolves from the region in the early 20th century was to blame.  Wolves?  New trees?  How could that be?  Without wolves, the behavior of the Yellowstone elk had changed.  No predators. No worry. So the elk became lazy, acting like cows, lying around in shaded areas along the rivers and creeks, munching contentedly on the juicy fresh growth of the willows and aspens.

     In 1995, after much political battling, wolves were reintroduced into Yellowstone. The wolf population grew and the elk learned to be on the alert.  As the wolves’ favorite food, the elk had to change their behavior to survive—no more relaxing by a stream where wolves could easy sneak up and make a meal of them!  They had to move around and spend more time in open places where watching for hungry wolves was far easier.

     The wolves are changing the Yellowstone landscape in positive ways.  The aspens and willows are coming back.  Beavers, which had almost disappeared from some parts of the park, are returning.  These rodents feed on aspens and willows and use them to build their dams and lodges.  Beaver dams create ponds, and the ponds provide homes for hundreds of species of plants and animals, from algae and water striders to ducks and muskrats.  The willows and aspen trees around the pond are nesting sites for songbirds and homes for insects and spiders, all thanks to the wolf.

​     Welcome back, wolves!
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This aspen shoot has been chewed to bits by elk. Dan Hartman
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These aspen shoots have been allowed to grow strong and tall. Dan Hartman
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Wolves on the hunt in Yellowstone. Dan Hartman
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Now that the aspens and willows are returning, so are the beavers. Dan Hartman

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Dorothy Hinshaw Patent's book, When the Wolves Returned: Restoring Nature's Balance in Yellowstone, is an IRA/CBC Teachers' Choices book, an ALA Notable Children's Book, A Book Sense Pick, and an Outstanding Science Trade Book for Children, as well as receiving the Orbis Pictus Honor Book Award. Booklist calls it "A great choice for elementary units about science and environmental protection," and Kirkus gave it a starred review. Click here to read the reviews.

Dorothy Hinshaw Patent is a member of iNK's Authors on Call and is available for classroom programs through Field Trip Zoom,  a terrific technology that requires only a computer, wifi, and a webcam.  Click 
here to find out more.

MLA 8 Citation
Patent, Dorothy Hinshaw. "Everything Is Connected: The Butterfly Effect and the
     Wolf." Nonfiction Minute, iNK Think Tank, 27 Mar. 2018,
     www.nonfictionminute.org/the-nonfiction-minute/
     Everything-is-Connected-The-Butterfly-Effect-and-the-Wolf.
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3 Comments

Climate Change: The Facts and the Consequences

12/16/2022

25 Comments

 
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Dorothy Hinshaw Patent
Nature’s Animal Ambassador

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PictureThe polar jet stream can travel at speeds greater than 100 miles per hour (160 km/h). Here, the fastest winds are colored red; slower winds are blue. NASA/Goddard Space Flight Center
     No one can honestly deny that our climate has been changing in recent years.  Before the winter of 2018-2019, California had only a year’s water supply stored in its reservoirs.  Wildfires have become an annual threat throughout much of the west, while the Midwest and East Coast have experienced record-setting winters.  These problems are due to complex interactions among temperature, winds, and water currents.

       A major change is the warming of the atmosphere.  The earth’s atmosphere has been getting warmer since the late 1800s, when factories started spewing out carbon dioxide.  Because natural variations also affect the temperature, a graph showing the temperature over time is a jagged line.  But the trend is consistently upward and follows the graph of increasing carbon dioxide in the atmosphere due to human activities.  That’s strong enough evidence that we are at least a large part of the problem, and the vast majority of climate scientists are urging countries of the world to reduce their carbon dioxide emissions.  

       A major player in the world’s weather is the jet stream, which helps circulate the atmosphere around the world about every two weeks.  This flow of fast-moving air speeds across North America from west to  east, separating cold arctic air from warmer, more  southerly air.  The jet stream used to run in a fairly direct arc across the northern United States.  But in recent years it has become less stable, dipping  southward in the eastern U.S. to bring frigid winters to the Northeast while arching northward in the West, carrying warm, dry air there. Scientists believe that the rapid melting of the Arctic ice brought about by global warming is part of the cause for the jet stream’s instability.  However, climate trends are controlled more by the oceans. Scientists estimate 95% of the heat from global warming is being stored in the oceans, increasing water temperatures even into the depths.

       As global warming continues, so will climate change.  The melting of sea ice and glaciers is already raising the sea level.  While scientists don’t blame climate change for devastating Hurricane Sandy, Sandy’s extreme coastal flooding was made worse by the increase in sea level that’s already occurred.  As time goes on, coastal cities around the world will be at increasing risk for more severe storm damage.

       Because warm air holds more moisture than cold air, storms are becoming more severe, increasing blizzards and flooding storms.  Some agricultural regions that depend on reliable rainfall may soon be unable to grow crops, disrupting the food supply.

      Climate change is complicated, but because it affects us all, we need to learn about it.  The Environment Protection Agency has questions and answers about climate change.

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Oceans cover 71% of the Earth’s surface and contain 97% of the water on our planet. This chart shows how this water has absorbed the vast majority of the increased atmospheric heat due to global warming.
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This chart shows how carbon dioxide in the atmosphere has increased since 1960. The measurements are made near the top of Mauna Loa on the island of Hawaii, thousands of miles away from any land-based major pollution.
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Calculations of global warming prepared in or before 2001 from a range of climate models. The projections assume no action is taken to reduce emissions.

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Yellowstone National Park’s majestic geologic wonders and remarkable wildlife draw millions of visitors each year. But there was a time when these natural treasures were in great danger, all because after years of unrestricted hunting, one key piece of the puzzle had been eliminated—the wolf.

Now, more than a decade after scientists realized the wolves’ essential role and returned them to Yellowstone, the park’s natural balance is gradually being restored.  Dorothy Hinshaw Patent's text supplemented by spectacular full-color photographs show the wolves in the natural habitat that was almost lost without them.  Click here to find out more.
​
Dorothy Hinshaw Patent is a member of iNK's Authors on Call and is available for classroom programs through Field Trip Zoom,  a terrific technology that requires only a computer, wifi, and a webcam.  Click here to find out more.

​MLA 8 Citation
Patent, Dorothy Hinshaw. "Climate Change: The Facts and the Consequences."
     Nonfiction Minute, iNK Think Tank, 17 Apr. 2018,
     www.nonfictionminute.org/the-nonfiction-minute/
     Climate-Change-The-Facts-and-the-Consequences.

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25 Comments

Amazing Maize

11/23/2022

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​
​Dorothy Hinshaw Patent

Nature's Animal Ambassador

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​     If  I asked you what grain is the most harvested in the world, you’d probably answer either wheat or rice.  But the answer is actually corn, more accurately called ‘maize.’  This nutritious crop that originated in Mexico feeds not only people but also animals around the world.  We’re used to the wonderfully tender sweet corn harvested in late summer and early autumn, but most maize is actually field corn, more starchy than sweet and used as animal feed or to make cornmeal and flour.

     For a long time, biologists puzzled about the origins of this important crop.  There is no wild plant that looks anything like modern corn, which is actually a giant grass.  The closest relative is a scrawny branching plant with hard dark seeds called teosinte.  It seems a huge jump from teosinte to corn, yet geneticist George Beadle found in the 1930s that corn and teosinte have the same number of chromosomes and could be crossbred to produce hybrids.  With the limited tools available at that time, Beadle deduced that only about five genes were involved in creating the differences between teosinte and corn.

     Fast forward to modern times, when scientists can look directly at DNA and analyze every detail of its structure.  We now know that Beadle came very close to the truth—about five regions in the DNA seem to control the major differences between teosinte and corn.  For example, these two plants look so very different, yet just one single gene turns a branched plant into a single stalk, like a stalk of corn.  Another single gene controls one of the most dramatic and certainly most important traits for farmers—the nature of the seeds and their stalk.  In teosinte, each seed has a hard covering.  Just one gene eliminates the hard covering and produces a stalk bearing exposed seeds, like an ear of corn.  

     Scientists now use maize as a perfect example of two major ways evolution happens.  One way is through major sudden jumps, like the change from a branching plant to a single stalk.  The other is the more gradual kind of change that has led to the thousands of different kinds of maize grown by farmers today.  There are probably hundreds of varieties of sweet corn and thousands of varieties of field corn.  Think about that the next time you bite into a nice crunchy taco made from a corn tortilla.
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Here you can see the major differences between a teosinte plant and a corn plant. Credit:TeosinteCornUOR

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Corn was a very important crop for homesteaders in the American West, used both to feed themselves as well as their animals.  Read about it in Homesteading: Settling America's Heartland, revised and expanded edition, Mountain Press, 2013.
​

Dorothy Hinshaw Patent is a member of iNK's Authors on Call and is available for classroom programs through Field Trip Zoom,  a terrific technology that requires only a computer, wifi, and a webcam.  Click here to find out more.


​MLA 8 Citation
Patent, Dorothy Hinshaw. "Amazing Maize." Nonfiction Minute, iNK Think Tank, 8
     June 2018, www.nonfictionminute.org/the-nonfiction-minute/Amazing-Maize.

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