Group Name: Anyone Else
# of Ind
Partial Lab Report 3 (Results and Discussion)
Name, Section, Title, Date, Location, Physical conditions
Adequate narrative section with approriate references to tables, figures,
Appropriate tables and figures with proper legends
Include T-test, similarity coefficient, and any other statistics that may be
Adequate discussion of results
Comparison with a published study (1)
Restate thesis and predictions in relation to results
Correct spelling, grammar, sentence structure, word choice
Correct reference format: AMA Format
Dept. of Biological and Environmental Sciences
BIO L229 – GENERAL ECOLOGY LAB – Fall 2018
Light Sampling for Adult Invertebrates
Several methodologies have been developed to sample for adult flying insects. This laboratory
exercise will utilize on the light trapping method to collect data in two distinct areas under two
different light sources. Light trapping is a simple sampling method that uses a translucent
material of a known size and a central light source. Ecologists often utilize sampling techniques
to gather information about a population or community in which it is difficult to take a census of
all individuals in an area of interest. From the data collected, inferences can be made about the
entire population or community. The data collected during this exercise can be used to compare
species composition and distribution found in the two unique areas as well as assemblage affinity
for light source.
1. To hone ability to create and test hypotheses.
2. To become familiar with common sampling methods for adult invertebrates.
3. To become familiar with identification of common flying invertebrates.
1. Choose an appropriate location for sampling in your designated area (area with two trees
appx. 8ft apart)
2. Tie a rope between both trees about 6ft above the ground.
3. Hang battery powered light source with your designated light source type at the appx.
Center of your rope.
4. Take a sheet of know size and drape it over the rope with your light source at the center
of the sheet.
5. Pull corner of the sheet taught to an appx. 45-degree angle creating a tent-like shape.
6. At the base of each side place a container for collection in step 8.
7. Turn light source on at designated time and keep it illuminated for 45 minutes.
8. Upon completion of the 45-minute period, using a squirt bottle, spray 70% ethanol on the
insects and scrape them into the container.
9. Fill the remainder of the container with 70% ethanol.
10. Sorting and identification will occur in the following lab.
What will be required from this
Next week, Tuesday the 9th: Quiz
Following Tuesday the 16th: Partial Lab Report (Results and
What is behavior
Behavior is any action that an individual carries out in response to a
stimulus or its environment, especially an action that can be
observed and described.
Common Behavior of Insects
Attraction to light
What does this
have to do with
what we are
Common method for collection of adults insects
Exploits insects phototactic behaviors
What will we find?
Butterflies and Moths
Likely only going to see moths
Lacewings (net-winged insects)
Almost everything you consider to be a fly and more
Along the trail, Find two trees appx 5’-8’ apart.
Tie a rope taught at appx 5’ off the ground
Hang a sheet over the rope
Position light source under the sheet
Before set up
Create a hypothesis and
Develop a hypothesis within your group regarding the Density and
Diversity between the two light treatments.
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