Hands-on Problem set from Chapter: 7, which can be found at: http://sites.sinaue
ID: 113502 • Letter: H
Question
Hands-on Problem set from Chapter: 7, which can be found at: http://sites.sinauer.com/ecology3e
For each assignments you MUST:
1. Begin your assignment with a paragraph description of the scenario that you will be studying.
2. Answer all of the specific questions listed in the exercises.
3. Write a concluding paragraph that includes:
a. an additional hypotheses about the research or exercise.
b. questions you have about how the study was conducted or exercise was created and how it could be improved.
Explanation / Answer
Since trade offs are important features of life which means that no organism can invest all its energy in every fuction of structure. The increased reproduction in an organims will result in reduction in growth and vice versa. One example is the live bearing fish Brachyrhapsis rhabdophora which lives in northwestern Costa Rica in small streams and rivers. The minimum growth of female is 24 mm but they can grow twice this length. The number of offspring produced will increase with body size. Small females can have 1-2 offsprings whereas large females can have 30 offsprings. Females that uses their energy for reproduction with small size will never be able to grow to the larger sizes. They live in two types of environment. Predation rates are low and they are the only species in the upstream areas whereas in the downstream areas they can occur together with many other species like several predators and the predation rate is also high. These fishes can allocate resources to either growth or reproduction. Bigger individuals produce more offsprings than smaller ones. In this case delaying reproduction can be beneficial to the organism. But there is also problem since organism also faces the risk of death due to predation or waiting too long before reproduction might result in being eaten away before it reproduces. So there must exists a balance between these two pressures so that reproductive growth is maximised.
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