[8.1] how does your assistant’s graph (which includes all the males in the pool)

Question

[8.1] how does your assistant’s graph (which includes all the males in the pool) compare to yours from page 3 (which includes a smaller sample of males from the pool)?

It is similar, both histograms show high numbers of males with a spot brightness of 15 and 16. The assistant’s histogram shows more males with a spot brightness of numbers down to 12 and more with 20 as a spot brightness.

[8.2] visit Lower West Stream, Upper East Stream, and Lower East Stream by clicking on each pool on the Map. For each stream, COPY or PRINT your assistant’s histogram. Write the stream name and take notes on features of the stream and the other species that live there. Finally, visit Meir Creek to see what lives there.

Lower west stream

[8.3] before moving on to the next section, write a short description of the natural history information you’ve found so far in your studies, including any differences between the pools. This should include your observations, but NOT hypotheses for what you saw—don’t try to explain anything yet, just summarize the facts:

At the species, there are difference between them. In the lower west stream, there are Cichlid B and rivulus fish species, and in the lower east stream there are Cichlid A species. In the upper east steam, there are only male and female guppies. The upper east stream has the highest amount of males with high spot brightness. In the lower east stream, the male guppies have lower spot brightness (as seen in the histograms).

[1.1] write down at least two hypotheses for what might be causing the differences in male showiness between the pools. Think about things other than the guppies themselves that were different between the pools:

- Female mate choice affects male spot brightness

- predation affect spot brightness

[1.3] describe the logic of your experiment(s) in the space below. What species will you use? What will you do with them? How long will your experiment(s) have to run before you can collect data? What data will you collect? What graphs will you draw to analyze the data? Sketch what your graphs will look like if each hypothesis is correct, and also what they will look like if each hypothesis is wrong.

Describe your experiment(s) here:

The experiment that will be used is the interspecies competition. The number of other species in the habitat affects the spot brightness of male guppies. The species that will be used is Cichlid A. They will be placed into the lower and upper west streams. They will run for 60 days before I collect my data. The spot brightness of the male guppies will be collected through a series of histograms. If my hypothesis is correct the spot brightness proportions will decrease throughout the series of histograms. If my hypothesis is incorrect, they will stay the same or increase.

Scenario 1: male caribou in lengthy sparring matches to win the favor of on looking female caribou.

Scenario 2: Peahens (female) mate with Peacocks with the largest and most iridescent tail feathers.

1) What types of sexual selection is present in scenario 1 and scenario 2 ? (respectively)

2) what type of sexual selection did we observe in lab with the guppies? Explain?

Spot Brightness Proportions Spot Brightness Proportions Lower West Stream Upper West Stream' Spot Brightness Proportions Spot Brightness Proportions Spat Brightnees Spot Brightness Proportions Spot Brightness Proportions Spot brightness Proportions Spot Brightness Proportions Spoe Brightness Spot Brightness Spox Srighenes 30 Spot Eightness Proportions Spot Brightness Proportions Extra Question: Scenario 1: male caribou in lengthy sparring matches to win the favor of on looking female caribou. Scenario 2: Peahens (female) mate with Peacocks with the largest and most iridescent tail feathers. 1) What types of sexual selection is present in scenario 1 and scenario 22 (respectively) 2) what type of sexual selection did we observe in lab with the guppies? Explain'? Spot Brightness Spot Brightness

Explanation / Answer

1) interasexual selection in scenario 1: sexual selection between two males

Intersexual selection in scenario 2: secual selection between a male and a female

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