Chapter 7. Chapter 7: Population Ecology
What is a population...?
Interactive Study Guide
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Guiding Question 7.1
What is a population, and why is it an ecologically significant concept? What factors do ecologists use to describe and monitor natural populations?
Why You Should Care
If you’ve ever ridden on a crowded elevator, you understand population distribution patterns. Have you noticed that every time someone new gets on, everyone else shifts so that there’s as much distance as possible between each person? Essentially, people on an elevator usually consciously or subconsciously adopt a uniform distribution because everyone wants the maximum amount of personal space they can get. Distribution patterns can explain both human behavior and the behavior of other organisms and give a clue to the environmental factors with which they are interacting.
Question Test Your Vocabulary
Choose the correct term for each of the following definitions:
| Term | Definition |
|---|---|
| 782Yka+Fy/2bECPAzrAdxmQoe2TUjkKrwsOnexAhVh8Oz9OfqU6FMEJzm43vJ7tVlB8wCIGAeYLlvopXgAInOIsDkcOnru6uYsENGv5LLdT/5hjmdNObPbd7lGTdC70J5oZfFO4dAZzXDTcuIcPQii2YpK4kHrTUT9iEbjSXotTOaS9/EPt2BQ025s60eaNcx9/plA== | Individuals are spaced evenly, perhaps due to territorial behavior or mechanisms for suppressing the growth of nearby individuals. |
| Ye7THp8JKFGl1vTsyTZt0Vz/hjD3Go/0Kfo4yA5LafY4rlrDA6bX7dE/mijcs0vuq1eSLSZ2tjSwaSkHOhCvIfMAecs42f9uF5fSoomb4y+PYP3alHoMo6d7IfbpeJrAs5lxhZ4OCh8SRm46WYzuTse7dMus8LTJXjM9uUt9pTzDzh9+bX2jwZ1MFYMtOmgtzxXeoQ== | The location and spacing of individuals within their range. |
| 16qJOsvRWHJ18rTNI23lEHxtuD0Z9tFRc1D/j4BIB3H5dYFgROLcY4IdIC9mTwARdl0N0Z62mDJ17xy6VgmQgpLeCG8XNvdOUSb8oApEUZs1rN92zbZqAtvG11T9CZIzlB0qM67EWfNgq/2Z/0CE/K8yDuLuXy6dfTwNIXSUa/FfbK94QE+XnYn7L1TebrdB/eAAqg== | An evaluation of the positive and negative impacts of a proposed environmental action, including alternative actions that could be pursued. |
| kmABDiX1saNkhRJyVEh1x1PjFvdyK30hxh4I+9FrbwcqqLKkCd73de6r0qIDXyRkOVxB6TfUqE88898Dgnd4Ec2EJ9TOmhOvEjk3X1Eu1baiwarC99rVf1ozcyzRsTYxdujgGcSMKNdO61/dcfAsvRyqnHoczVyL9YOfnvyhOrbiDqGBrkTM0z3hwTvCL+p2mSIDrA== | Individuals are found in groups or patches within the habitat. |
| ckW+CqPft2yU12/eJw7CWWucc//tKObz5KX++IAO/XOcheoKNMTiLI5suvPGkenxRHNozItrikChwyu7I9YMW8ZwvriOjfOkXfxMTRey/26T2hgev0g5oZiV3QMpypqAQFHVmHmJfVhmCQFYa2eoXy7QRGsMs5n6IP50h7ICw/lcj8lv4+GNcCEVJvMw86lC+GNd4g== | The number of individuals per unit area. |
| CTPtl1uxdbkd+MnKKAAPAW4R3C/exNyj504So1Dxagb12N2DnjIU2zJ+OtMiiHS6nFAcXWYUwZuT9CVH5gNO8/ofA4iMJBwF3MTL1/vTmFHbJtqD+Zxkwm/XOan17q1YNX+NojPWWybZsIXQ0O8rNuAbbGIcuIrB6+9x41DnPd4/QanH+eIXh6vkffYinCsAa1AVpw== | Individuals are spread out over the environment irregularly with no discernable pattern. |
999
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Correct.
Incorrect.
Question 7.1
0485IcVVfkbhYjnMVrGjNLwKDTOrttXt60YV51uv9Uo7MYiNV/wCMgby7kbnsEE/77UJ1hAHPZEkfxdQlZoBGOST7sNlGP/F/v2pYl0nO8tMDhQaIdgPw/41oXgkgHUsMmt6feuQEguENVdLIqRUSgGWfaFkPZhwxJFa7RVzZ8JQAsHYfGBa+Fy8zGJB9kYAV86og0zpnTn6RoUgej+feSVpAUCvzlxLPTuUldO07eEdB2MT/U0IxzSW1cLWwe1lSGrp/FAGaxNIZfFVS1ZhJV+JuLL1MJ4pmKqE8e952kv1xX8thKsemSYU/RilifeHJkE4FQ==999
Try again.
Correct.
Incorrect.
Predict what sort of distributions would result from the following situations:
Question 7.2
Bm3hEeZkJlc/HbP5lILckf1tl1D8IncEfcgK7fPN5TbqQAmzUe8zRm0HNZc+yrjqoHdlALInYUedJnV0ny8zQo5PXCBthGTxIgpevLB1LivVApaqAyhj4Wpj9/L08NvQrhiCUO1rzVIzxQNi9pYNAXT7yx75Ad+BR3NGP4LDpdaEC/jbsuQ0IRwy1olt55KTTvxEyezZXquyNXXACQN5/R7JIKcDJV07VeGlakZil3rveBXsbI7gsfV96v0MckW+q3Veoihd2Ju/AuxAx/JkIwOopd95UO71lV7pdkNVBnqs/4OWkL+AaLyREm2/YORR+wMrDLwD0EBsrbu+999
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Correct. The best answer is uniform. If the bees all have similar ranges and those ranges all intersect one another, you’d expect each bee to space himself even distances away from his competition.
Incorrect. The best answer is uniform. If the bees all have similar ranges and those ranges all intersect one another, you’d expect each bee to space himself even distances away from his competition.
Question 7.3
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Correct. The correct answer is clumped because barnacles tend to aggregate in the same area.
Incorrect. The correct answer is clumped because barnacles tend to aggregate in the same area.
Question 7.4
2R3wVlVYhI1u+usgEI8I1Wf9fLdRGmg2jQ6n1pK3e73T38hdMs74jQ5G7V4NWNpWmkj1IpWLwAymHfJpUP6uzKW1jyHerjymnTxepzC6R4c8hm6BMsh1Kn13OMgS6i1uZBw9Vt1d5dEYQ6AWrpbnPXOFW4Pz96HT3kHhQ/5VAhtqWHc0Ly3k1bL4Zd9s4f7KTt+1NUJXvUWSm6wo/2YKDk4zqcABrP47Se7cIaR1dzCdHedom2kefdaGmgSf+37EGVzsU5DpwBJRaOwSRkTujmWzbMEICnAUVgDlPcHuELV9z8bTZ/SYFSBhepInp397b2V5lIqg8SAklMWl2i5TEmSmu3E2ShW+KqW/oLG0+Pf1iCBO1W4vG7xuYz8Z+zYoamopVq7cJUWJDVoZo0sb10c7va4mcpj1zemFGclewqllDqqordS0dUsG+7SrriIP25pDdDsLvrUR0wFv9EkFd7/13Tk=999
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Correct. The best answer is random because, with no cues for settling, barnacles will establish themselves more or less wherever they land.
Incorrect. The best answer is random because, with no cues for settling, barnacles will establish themselves more or less wherever they land.