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Web LinksUNIT 30AUNIT 30BUNIT 30C
UNIT 30D
Page 33 WEB Activity: Canadian Achiever: Stephen Herrero Ecologists use many techniques to determine population size, density, and growth. One such ecologist is Dr. Stephen Herrero, a professor emeritus of environmental science at the University of Calgary . Dr. Herrero specializes in wildlife ecology and conservation biology with a special interest in the ecology of large predators-most notably grizzly bears. Learn more about Dr. Herrero and his research on grizzly bears in the eastern Rockies . Write a report or make a presentation that explains how Dr. Herrero uses knowledge of population size, density, and growth to improve grizzly bear management and conservation efforts. Site provides a brief biography of Dr. Herrero and links to relevant sites. Eastern Slopes Grizzly Bear Project Provides a downloadable version of Herrero's report. Page 35 WEB Activity: Wildlife Tracking It is often difficult to determine the range and distribution of wildlife over long periods of time. While many organisms are easy to observe during parts of the year or parts of their life span, they may be very difficult to locate at other times. For example, it is easy to observe sea turtles when they come ashore to lay eggs, but harder to find where they travel and feed in the open ocean. It is easy to observe Alberta 's breeding birds in the spring and summer, but much more difficult to determine their migration routes and winter range. Many species pose similar challenges. Beginning in 1937, researchers Fred and Norah Urquhart annually marked monarch butterflies in order to discover the wintering location of this migratory species. In 1975, they finally discovered it. In this activity, you will conduct research to explore the science of marking and releasing organisms. Develop your own questions, or find answers to these. How did the Urquharts tag butterflies? How did their persistent efforts play a role in the discovery of the monarch migration route? Urquharts Receive Order of Canada These researchers received Canada 's highest honour for their scientific contributions This page from the Smithsonian Encyclopedia briefly reviews the work of the Urquharts and others. Gather satellite data on species tagged with radio transmitters and plot their movements on a map. What information can be obtained from this data regarding population densities, distribution and dispersion patterns, and behaviours? Porcupine Herd Satellite Collar Project Page 48 Explore an Issue: Carrying Capacity Changes in a Warm Arctic 5. Conduct library and Internet research to become more aware of the impact of climate change on Inuit in Canada . How does climate change threaten their traditional way of life? Inuit Observations on Climate Change This article is one of a number available on links on the Community Adaptation and Sustainable Livelihoods Web site. Sachs Harbour Observations on Climate Change This page, from the Web site of the International Institute for Sustainable Development, discusses changes in Canada 's High Arctic. Page 51 Investigation 25.1: Investigating Population Changes (h) If nutrients and light were readily available, the duckweed population in a small container could probably continue to grow until it was limited by physical space. Do you think the same is true of the human population on Earth? (i) What do you think is/are the key factor(s) that will eventually limit human population growth? (ii) Estimate Earth's carrying capacity for the human population, now more than six billion. (iii) Many scientists, economists, and organizations (such as the United Nations) predict that Earth's human population will stop growing late in this century. Conduct an Internet search to find out their predictions for the final stable population size. This link is to a paper discussing population, sustainability and Earth's carrying capacity, which was originally published in the journal BioScience. This page is from the Chicago Public School system.
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