Fish produce a hormone called isotocin, a hormone that is similar to oxytocin in mammals. Both hormones, oxytocin and isotocin, have been linked to social behaviors including the suppression of social anxiety, trust, and attachment. Prior to this study, the relationship between isotocin in the bloodstream and the amount of aggression or submission individual cichlid fish display was unknown. The researchers hypothesized that isotocin would suppress aggressive behaviors in cichlids to promote social cohesion as these fish exist in large social groups (schools). To address this hypothesis, each of 10 fish were exposed to two treatments, 1 week apart. One at a time, a fish was randomly selected from the group of 10 and either injected with a saline solution (that served as the control) or with isotocin. After this injection, the fish was returned to its group and the amount of aggressive and submissive behaviors the fish demonstrated was recorded for the next 10 minutes. One week later this process was repeated, with each fish receiving the treatment it did not experience the week prior. Thus, each fish served as its own control. Below is the data the researchers collected. Compile the data and create a graph that best represents these data. Standard deviation (1 Std) values have been provided for you and should be included in graph. 1) In order to consistently score fish on their behaviors, what tool did the researchers likely produce prior to recording their behavioral data? 2) Based on the pattern of data collected (not the statistics) did the researchers find support for their hypothesis? Why or why not? 3) What approach (of Tinbergen’s 4) to understanding behavior did these researchers use? Explain your answer.

Biology 2e

2nd Edition

ISBN:9781947172517

Author:Matthew Douglas, Jung Choi, Mary Ann Clark

Publisher:Matthew Douglas, Jung Choi, Mary Ann Clark

Chapter45: Population And Community Ecology

Section: Chapter Questions

Problem 21RQ: Which of the following is not a way that humans have increased the carrying capacity of the...

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Fish produce a hormone called isotocin, a hormone that is similar to oxytocin in mammals. Both hormones, oxytocin and isotocin, have been linked to social behaviors including the suppression of social anxiety, trust, and attachment. Prior to this study, the relationship between isotocin in the bloodstream and the amount of aggression or submission individual cichlid fish display was unknown. The researchers hypothesized that isotocin would suppress aggressive behaviors in cichlids to promote social cohesion as these fish exist in large social groups (schools). To address this hypothesis, each of 10 fish were exposed to two treatments, 1 week apart. One at a time, a fish was randomly selected from the group of 10 and either injected with a saline solution (that served as the control) or with isotocin. After this injection, the fish was returned to its group and the amount of aggressive and submissive behaviors the fish demonstrated was recorded for the next 10 minutes. One week later this process was repeated, with each fish receiving the treatment it did not experience the week prior. Thus, each fish served as its own control. Below is the data the researchers collected. Compile the data and create a graph that best represents these data. Standard deviation (1 Std) values have been provided for you and should be included in graph. 1) In order to consistently score fish on their behaviors, what tool did the researchers likely produce prior to recording their behavioral data? 2) Based on the pattern of data collected (not the statistics) did the researchers find support for their hypothesis? Why or why not? 3) What approach (of Tinbergen’s 4) to understanding behavior did these researchers use? Explain your answer.

Fish from
Group Number
1
2
3
4
5
6
7
8
9
10
Average:
Std
Isotocin Injected
Control
# of acts per 10 minutes # of acts per 10 minutes
Aggressive Submissive Aggressive Submissive
6
5
2
3
3
4
6
6
3
5
8
3
4
1
5
6
4
1.9
7
8
4
5
8
7
6
9
3
1.9
5
2
3
4
5
1.7
5
2
3
4
1.5

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