Tuesday, August 22, 2023

Test if your sense of smell is as strong as a shark´s

Materials:

3 large drinking glasses
measuring cup
water
perfume (essential oils, such as lavender, work well also)
marker

Procedure:

1. Label the glasses

2. Fill the glasses with 2 cups of water.

3. In the glass marked ¨10 drops¨place 10 drops of perfume. Repeat with the other glasses (5 drops and 1 drop).

4. Swirl them around to mix the water and the perfume.

5. Now smell each glass.

Analysis:

Which has the strongest smell?

Monday, August 21, 2023

Sphoeroides spengleri- un pez letal

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Grey snapper (Lutjanus griseus) - Xcalak (Mexico) 14-11-2015

Thursday, August 17, 2023

French Grunt (Haemulon flavolineatum), Yellow Goatfish (Mulloidichthys m...

Haemulon flavolineatum

Tuesday, August 15, 2023

Lionfish, Sea Urchins, Crown of Thorns - Reef Life of the Andaman - Part 17

Pteroris volitans (invasive species)

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Cheilopogon melanurus

Pseudetroplus maculatus, Orange Chromide in the wild

Monday, August 14, 2023

Observing Algae

Objectives:

Prepare wet mounts of algae for microscopic examination.
Locate and identify chloroplast, holdfast, and pyrenoids of various species of algae.
Distinguish among unicellular, filamentous, and colonial forms of organization.

Process Skills:

Observing
classifying
recognizing
spatial relationships
using numbers.

Time Allotment: 2 class periods

Materials:

microscopes
microscope slides
coverslips
droppers
iodine solution
paper towels
laboratory aprons
living specimens of

Closterium
Oedogonium
Scenedesmus
Synedra
Ulothrix
Volvox

Preparation:

Be sure to order algae cultures to arrive prior to your lab day. Some biological supply houses sell algae sets. Check the catalog to see if the specimens required for this Exploration are more economically obtained as part of a set.
Prepare iodine solution according to directions.

Test for Carbohydrates (Test for Starch)

1. Put on goggles and an apron. Label three test tubes 1, 2, and 3. Place them in a test-tube rack.

2. Using a separate dropper for each solution, add 10 drops of soluble starch solution to test tube 1, 10 drops of glucose solution to test tubes 2, 1, and 10 drops of water to test tube 3. Record the color of each tube's contents in Table 1.

3. Add 3 drops of iodine solution to each test tube. Caution: If iodine is spilled, rinse with water and call your teacher immediately.

4. Record in Table 1 the color of each tube's contents after the addition of the iodine. A blue-black color indicates the presence of starch.

5. Discard the contents of the test tubes according to your teacher's directions. Gently use a test-tube brush and soapy water to clean the three test tubes and rinse with clean water.

Teaching the lab:

If sufficient microscopes are availables, have students work individually.
Set up algae specimens with individually labeled droppera. This will prevent contamination.

Data and Observations

Analysis

Synedra and Closterium
Usually 4, most colonies have 2 to 6 cells.
The individual cells of Volvoz are very small and they are very numerous. Two flagella on each individual cell allow the colony to move.
Closeterium, Oedogonium, and Ulonthrix contain pyrenoids.
Pyrenoids produce and store starch.
Iodine Stains starch blue-black. Pyrenoids contain starch, so they are stained by iodine.

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SOUND IN THE OCEAN

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Dynoflagels organisms

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plankton

Plankton

How to plankton float?

Plankton are microscopic organisms that drift in the ocean, where they are moved about by wind, waves, and currents. They must stay near the sunlit surface in order to live. Because plankton have no muscle, they cannot swim to stay afloat. In this lab, you will construct different-shaped clay models to determine how shape helps plankton stay near the ocean surface.

Skill Focus: Modeling

TIme: 30 minutes

Materials:

clear container
water
modeling clay
watch with a second hand

Procedure

Fill the clear container with tap water.
use the clay to make several different shapes that you think will stay afloat.
One by one, place your clay models on the surface of the water. Time how long each piece takes to reach the bottom.
Record the observations.

What do you think?

What were the characteristics of the clay shape that sank the slowest?
What factors affected how fast your clay shape sunk?

Challenge

Some kinds of floating organisms release oil droplets or air bubbles to help them stay afloat. How could oil or air help them float?

Bibliography

How to plankton float? (1996). In J. Trefil, R. A. Calvo, K. Cutler, D. Carnine, S. Miller, D. Steely, & V. Vachon, Earth's Waters (p. 124). Evanston: McDougal Littell Science.

Saturday, August 12, 2023

Rachycentron canadum

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Sailfish_ Istiophorus platypterus_

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Scomberomorus cavalla

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What do aquarium snails eat?

Goal:

With the help of written directions or in a presentation, the student will prepare microscope slides of specimens that they have collected in the sample.
Equipped with a microscope, the student will draw photosynthesizing and non-photosynthesizing protists.
The student will observe the eating habits of the snails that inhabit the aquarium.

Materials:

Aquarium in use
snail.
microscopic slides
cover sheet
microscopic
toothpick

Process:

1. Observe the snail activity in your classroom aquarium and record your observations.

2. Use a toothpick to take a sample of the green film from glass and other surfaces. Place some on a slide sheet.

3, Mix the scraped material with a drop of water. Carefully cover each sheet with a cover sheet.

4. Look for cells in the sheets and write down their appearance. It is portable each sample contains several different types of cells.

5. It attempts to differentiate photosynthesizing protists from cyanobacteria. Protists will have chloroplasts that will look like dark green areas inside the cells. Cyanobacteria usually have a uniform color because they do not have organized chloroplasts; They are also smaller than protists.

Biggs, Kapicjka y Lundgren (2002) Biología Dinámica de la Vida, p. 523

Analysis:

1. What evidence did you find that the snails were consuming photosynthesizing organisms in the tank?

2, What do the cells you collected look like? Did they contain chloroplasts?

3. What conclusion did you get about the photosynthesizing organisms that are eaten by the snails in your aquarium?