Discover Nature in Water & Wetlands: Things to Know and Things to Do
By Elizabeth Lawlor and Pat Archer
()
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"A nice range of accessible information and activities." - Orion Afield
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Discover Nature in Water & Wetlands - Elizabeth Lawlor
Frank.
INTRODUCTION
This book, the seventh in the Discover Nature series, is for people who want to find out about the wild things that thrive in ponds and puddles. Like the other volumes in the series, this book is concerned with knowing and doing. It is for people who want to get close to nature. It is for the young, for students, for teachers, for parents, for retirees, for all those with a new or renewed interest in the world around us. Getting started as a naturalist requires a friendly, patient guide; this book is intended to be just that. It is intended to gently lead you to the point of knowledge and experience where various field guides will be useful to you. When you have done
this book, I hope that you will feel in touch with the plants and creatures that live in wet places.
Each chapter introduces you to a common, easily found living thing that can be found in ponds or puddles and summarizes the major points of interest in the scientific research available. You will learn about its unique place in the web of life and the most fascinating aspects of its lifestyle. Each chapter also suggests activities—things you can do to discover for yourself what each creature or plant looks like, where it lives, and how it survives.
In the first part of each chapter, you will find the important facts about a particular living thing, including some amazing discoveries that scientists have made. You will learn the common names of plants and animals, as well as their scientific names, which are usually Latin. In the second part of each chapter, called The World of . . .
you will be guided through a series of observational and explanatory activities. This hands-on involvement with plants and animals is certainly the most important of all learning experiences. This is how you will really discover what life in ponds and puddles is all about, something that no amount of reading can do for you.
HOW TO USE THIS BOOK
Feel free to start reading at any point in this book. If you’re really interested in dragonflies, for instance, and have a chance to observe them somewhere, read that chapter. Then read What You Will Need
below and The World of . . .
section of the chapter. This section also tells you what specific science skills are used in the activity. Do take the suggestion that you keep a field notebook.
My great hope is that this book will be only a beginning for you. I have suggested other readings, keyed to each chapter, to help you learn more than this book can provide. In a sense, when you begin your explorations, you will go beyond all books. Once you get started, Nature herself will be your guide.
WHAT YOU WILL NEED
To become fully involved in the hands-on activities suggested in this book, you’ll need very little equipment. Your basic kit requires only a few essentials, starting with a field notebook. I generally use a spiral-bound, five-by-seven-inch memo book. Throw in several ballpoint pens and some pencils and a flexible ruler. Include a small magnifier or hand lens. Nature centers generally stock good plastic lenses that cost a few dollars. You may want to have a bug box—a small, see-through acrylic box with a magnifier permanently set into the lid. It’s handy for examining spiders, beetles, and other small creatures; with it you can capture, hold, and study them without touching or harming them. A penknife and several small sandwich bags are also useful to have on hand.
All the basic kit contents easily fit into a medium-size Ziploc bag, ready to carry in a backpack, bicycle basket, or glove compartment.
Basic Kit:
field notebook
ruler
magnifier or hand lens
bug box
penknife
pens and pencils
small sandwich bags
Although not essential, a pair of binoculars adds to the joy of discovery when you are exploring. You may also want a camera and lenses for taking pictures. A three-ringed loose-leaf notebook is helpful for recording, in expanded form, the information you collect in the field. As you make notes, you’ll have an opportunity to reflect on what you saw and think through some of the questions raised during your explorations. Consult your reference books and field guides for additional information.
As you read and investigate, you will come to understand how fragile these communities of living things can be, and you will inevitably encounter the effects of humankind’s presence. I hope you will become concerned in specific, practical ways and will seek to help make a difference for the future of the environment. We still have a long way to go.
A LIFE-GIVING LIQUID
It is a bitterly cold winter morning. An icy wind whips across the snow-covered field, leaving a cloud of powdery snow in its wake. The sun’s rays make miniature sparkling rainbows on the ice-encased tree branches. A few hours have passed since the hockey players left the warmth of their homes. They are thirsty and chilled. It’s time to seek shelter in the shed, where each left a snack and a thermos filled with a warm drink before the game began. When the thermos bottles of hot liquid are opened, clouds of steam rush into the cold air.
During this short span of time, the players have experienced the varied phases of water: solid, liquid, and gas. Each of these watery expressions is essential for life as we know it. Water makes up about 70 percent of our body mass, and it transports essential vitamins and minerals throughout our bodies. Plants and other animals have similar needs for water. Water covers about three-fourths of the earth’s surface, and about 97 percent of it is found in the oceans. About 2 percent is locked in ice as glaciers and ice caps. Only about 0.7 percent is in freshwater lakes, ponds, rivers, and underground streams.
The chemical formula for water is H2O, meaning that a molecule of water is made up of two atoms of hydrogen and one atom of oxygen. The oxygen atom and the two hydrogen atoms bond very strongly to form one water molecule, a bond which is difficult to break. What you may have forgotten is that there are additional, weaker attractions between oxygen and hydrogen that cause adjacent water molecules to form weak but important bonds with each other. Water molecules connect weakly to other water molecules by the attraction of the hydrogen atoms in one molecule to oxygen atoms in other molecules. This bonding results in loosely arranged and unstable chains that give water its fluid nature.
This structure of water molecules gives water an array of remarkable qualities. Water freezes at 32 degrees Fahrenheit (0 degrees Celsius) and boils at 212 degrees F. (100 degrees C.). If water lacked those weak hydrogen bonds holding the molecules together, it would boil at minus 112 degrees F. (80 degrees C.) and freeze at minus 148 degrees F. (minus 100 degrees C.). Life under these conditions would be impossible, because there would be no liquid water at normal earth temperatures—no oceans, no lakes, no rivers, and no essential body fluids.
Water has many other characteristics essential for life. It responds more slowly to changes in air temperature than other liquids. If you live in the Northeast and have gone swimming late in the spring in the ocean or a lake, you have experienced this phenomenon. Although the temperature of the air is generally rising at this season, the temperature of the water has not increased accordingly. Your dive into the water leaves no doubt about this. The reverse is true in the fall. Bodies of water will still be warm enough for swimming through September and perhaps into October, although there may be a definite chill in the air. This is why bays, lakes, and other bodies of water are called heat sinks.
Water stores heat, acting like a giant reservoir that evens out temperature fluctuations on our planet. This occurs because the hydrogen bonds that link water molecules together help water absorb a large amount of heat before there is a change in its temperature. Once the temperature of water has risen, it is slow to release this heat as the air temperature cools.
Like most other substances, water shrinks when it cools. However, when it drops to 39 degrees F. (3.89 degrees C.), water ceases to shrink and begins to expand. Continued cooling results in continued expansion. Water below this temperature is less dense, and therefore lighter, than an equal amount of warmer water; this makes ice float.
As winter approaches, surface water cools down, becoming dense and heavy. It sinks to the bottom of the pond, pushing up the warmer water beneath it. This water cools at the surface, becoming dense and heavy, and it sinks. At some point, the whole pond will be about 39 degrees. Now, as the surface water continues to cool, it no longer sinks but stays at the surface, where it continues to cool until it reaches 32 degrees F. (0 degrees C.), the freezing point of water. From the moment the water temperature dropped to 39 degrees F. (3.89 degrees C.), it began to expand. As it continued to cool it became lighter. The result of this is that water colder than 39 degrees F. and ice both float.
If the weather is really cold, the surface ice will get thicker and thicker. This is good insulation that prevents the deeper water from freezing. Only a shallow pond will freeze to the bottom.
In the spring, the sun and the warming air combine to melt the surface layer of ice. The lighter ice keeps floating up over the warmer meltwater, exposing the cold ice to the warmer air, which then melts and is pushed aside by the lighter ice, until the whole body of water is again liquid at 39 degrees F. After this, the surface water continues to warm up, while the deeper areas remain quite cold, but not colder than 39 degrees.
If this process did not take place, the bottoms of ponds would remain frozen all year, and each winter would add to the bottom ice, until only a thin surface layer of water would melt each summer.
These properties of water protect aquatic plants and animals from rapid and potentially destructive temperature changes. Fish can continue to live in the cold yet unfrozen pond water that lies beneath the layer of ice.
The change in the density of water as it warms and cools has important side effects for the life in ponds. In late fall, as winter approaches and water becomes denser and sinks to the bottoms of ponds, it carries with it dissolved oxygen and nutrients. This action replenishes supplies of vital nutrients used up during the summer. In the spring, the process is reversed, as warmer air begins to melt the pond ice. When the meltwater reaches 39 degrees, it is most dense and it sinks. Once again, the pond water circulates, carrying more oxygen to the depths and distributing nutrients. This fall and spring circulation is crucial to life throughout the pond. Without this seasonal circulation, the depths would be starved of oxygen, and nutrients would settle in the sedi ment and not be available to life in all layers of the water. Eventually it would die, and the pond would be lifeless.
During spring and autumn, the circulation in a pond or lake carries dissolved oxygen to deeper water and nutrients to shallower water.
Another fascinating characteristic of water is its ability to form a skin.
You can see this working in a drop of water. The surface of the drop is curved because the water molecules are attached to each other but not to the surrounding air or to the surface on which the drop is sitting. The attraction of water molecules to each other is also responsible for the rubbery
surface on a pond or puddle, a naturally occurring trampoline
strong enough to support insect life such as whirligig beetles and water striders. Mosquito larvae and other waterbound life forms use the underside of the surface skin.
The water’s surface forms a trampoline
that water striders can walk on.
Water has many additional properties or characteristics that make it unique and that are essential to the life of plants and animals. You can discover some of them by doing the activities suggested below.
OBSERVATIONS
Water has no smell or taste. It is colorless and transparent. It is commonplace. It is remarkable. Many scientists who have made water the focus of their life’s work began with simple observations and questions that led to more complex investigations. You can do some interesting things with water and explore its properties in the following activities. The explanations for each property are based on the behavior of molecules. Write down your understanding of the explanation for what happens in each investigation. Include diagrams when you think they will be helpful. Try to come up with additional investigations that will probe these properties. Can you apply your discoveries to plant and animal life in the water?
Water: A Dissolving Agent. Many kinds of minerals and nutrients are washed into the pond by way of rain runoff. These materials do not settle on the bottom of the pond because water is an excellent solvent, capable of dissolving mineral matter, much of which is then absorbed by plant life, which in turn is eaten by animals living in the water.
1. When a substance dissolves in water, the substance disappears and the water remains clear, although in some cases it is clear but takes on a color.
Put about three cups of warm water (twenty-four ounces) into a glass jar. Add a tea bag. As the molecules of tea fill the spaces between the water molecules, the water becomes tea colored. This mixture of tea and water is called a solution.
If you add some sugar to the solution, the sugar molecules will fill the spaces between the water and tea molecules. The new solution is a sweet tea. Is the solution clear?
2. Some substances do not dissolve in water, but remain as small particles suspended in the water. In a suspension, the water is not clear. Muddy water in a pond or lake is a suspension in which the particles of soil do not dissolve in the water. When you look at a pond, puddle, lake, or stream, you can see right away if there is anything in suspension. If the water is clear, there are usually minerals in solution, but this is not so easy to determine. Milk is another example of a suspension.
Sun tea results when water draws out tea molecules and disperses them in water warmed by the sun.
Density. Density is a science concept that relates closely to our everyday experiences. If you have two same-size solid blocks of wood (or metal or any other material) and one is heavier than the other, the heavier one is more dense. If the block is heavier than an identical block of water, it will sink in water. Certain kinds of wood, such as ebony, will sink, and some rocks, like volcanic pumice, will float.
Minerals dissolved in water increase its density. Salt water, for example, is more dense than an equal volume of fresh water. Temperature also has an effect on the density (weight) of water. The warmer water becomes, the less dense, or lighter in weight, it is.
1. To investigate the effect of mineral matter on the density of water, mix a few tablespoons of salt in a glass half filled with water. Stir to help dissolve the salt. Half fill another