Vocabulary STUDENT RESOURCE 1.1 INFORMATION SHEET AQUARIUM HABITATS SECTION 1 OBSERVING DAPHNIA 13

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1 Vocabulary daphnia a tiny animal related to shrimp that lives in fresh water Daphnia are also called water fleas because they seem to jump around. Many organisms in freshwater habitats eat daphnia. ecosystem all the living and nonliving things that interact with each other in an environment Living things in an ecosystem include plants and animals. Nonliving things in an ecosystem include sunlight, soil, water, and air. STUDENT RESOURCE 1.1 INFORMATION SHEET organism a living thing Some organisms are very small, such as daphnia. Others are very big, such as whales. All living things are made of cells. population all the organisms of the same type that live in the same place at the same time A population includes only living things. You and all the other people in your area make up a population of humans. habitat the place where an organism lives Aquatic habitats may be in the salty ocean or in freshwater lakes, ponds, rivers, and streams. Terrestrial habitats are on land. AQUARIUM HABITATS SECTION 1 OBSERVING DAPHNIA 13

2 STUDENT RESOURCE 1.2 INFORMATION SHEET THE ORGANISMS ARE COMING! 14 AQUARIUM HABITATS SECTION 1 OBSERVING DAPHNIA

3 Aquarium Log STUDENT RESOURCE 1.3 ACTIVITY SHEET Which aquarium does your group have? Aquarium Keep a log describing changes in your aquarium. Water Depth Aquarium Number Water depth at start Water depth after 3 days in the light cm cm in the dark cm cm Recording Populations Each time you add organisms to your aquarium, record the population in this chart. (If you cannot count the tiny duckweed plants, estimate the number as close as you can.) Kinds of organisms anacharis duckweed snails guppies Population at start Population at end Difference between : : start and end newts AQUARIUM HABITATS SECTION 1 OBSERVING DAPHNIA 15

4 Observing Daphnia, Page 1 STUDENT RESOURCE 1.4 ACTIVITY SHEET Observe the daphnia in your cup. List two ways you can tell the adults from the babies: 1 2 How do daphnia move? Turn an empty cup upside-down. Use a dropper to catch several large adult daphnia. Put them on the bottom of the cup. Tell what the daphnia look like. 16 AQUARIUM HABITATS SECTION 1 OBSERVING DAPHNIA

5 Observing Daphnia, Page 2 STUDENT RESOURCE 1.4 ACTIVITY SHEET Use the dropper to put five large adult daphnia in the vial. Pick ones that you think will have babies. Observe the vial with a magnifier to be sure there are only five adults and no babies. Put today s date in the first date box. Record the number of adults and babies in your vial. Use a for adults and b for babies. s Number of adults and babies a b a b a b a b a b a b Predict what will happen to the daphnia population. Draw an adult daphnia. Show what is inside it. AQUARIUM HABITATS SECTION 1 OBSERVING DAPHNIA 17

6 STUDENT RESOURCE 1.5 INFORMATION SHEET Counting Daphnia Populations Vial Numbers / Time start end Key: a = adults; b = babies 18 AQUARIUM HABITATS SECTION 1 OBSERVING DAPHNIA

7 Daphnia Body Parts STUDENT RESOURCE 1.6 INFORMATION SHEET Cells Esophagus Heart Food tube Eye Mouth Eggs Antenna Legs Filter hairs Compound eye with optic nerve Cells Carapace (shell) Anus Babies are born live AQUARIUM HABITATS SECTION 1 OBSERVING DAPHNIA 19

8 Section 1 Assessment STUDENT RESOURCE 1.7 ASSESSMENT SHEET Vocabulary 1 What kind of habitat do daphnia live in? B Daphnia Characteristics 2 Label each part of the daphnia. A a. C b. c. Daphnia Observations 3 Use a magnifier to look for the structures listed in the chart below on a large daphnia. Structure eye brood pouch antennae How the structure helps the daphnia survive. legs 20 AQUARIUM HABITATS SECTION 1 OBSERVING DAPHNIA