Purchase Solution

Threatened, endangered and extinct species

Not what you're looking for?

Ask Custom Question

Compare and contrast the designations of threatened, endangered, and extinct species. Describe three human causes of species endangerment and/or extinction.

Identify and discuss four ways in which forest trees are currently harvested. Which method is the most ecologically sound, and why? Which method is the most economical?

Purchase this Solution
Solution Summary

Human is the main culprit behind species extinction. Important anthropogenic reason for species extinction are habitat destruction, introduction of exotic species and overexploitation of species. Different parmeters were designed to categorised species into threatened, endangered and extinct species list. Accordingly ICUN has prepared a red data book.

Solution Preview

Please see the attached file.

Compare and contrast the designations of threatened, endangered, and extinct species. Describe three human causes of species endangerment and/or extinction.

Identify and discuss four ways in which forest trees are currently harvested. Which method is the most ecologically sound, and why? Which method is the most economical?

Following flow chart shows the different category recognized by ICUN :

Extinct means that the entire species has died out and can never return. Endangered animals are those in immediate danger of becoming extinct. Threatened species are likely to become endangered in the future.

S.No. Criteria Critically endangered Endangered Vulnerable
1 Reduction in population size over last 10 years or 3 generations > / = 80% > / = 70 % > / = 50 %
2 Geographic range in the form of
a Extent of occurrence 100 km2 5000 km2 20000 km2
b Area of occupancy 10 km2 500 km2 2000 km2
3 Population size estimated to number fewer than 250 mature ...

Purchase this Solution
Free BrainMass Quizzes
The Plant Body

This quiz will test your knowledge of the anatomy of a common plant.

Basic Concepts in Neuroscience

This quiz provides a review of the basic concepts in neuroscience.

Creating a Birth Plan

Preparing for a birth and want to make sure that you're including all the right information? Use this quiz to get on the right track and check your birth plan knowledge!

Cellular Respiration

This quiz is a review for cellular respiration.

How Much Do You Know About Genetic Inheritance?

Most of us studied the basics of dominant and recessive genes at some point. However, genetics are much more complicated than this. How far beyond the basics does your knowledge go?

View More Free Quizzes
Related BrainMass Solutions

  • Will the Karner Blue Butterfly and Long-Eared Bat Survive?

    Are those who are tracking the threatened and endangered species, offering an accurate inventory?

  • The Endangered Species Act

    An argument against the endangered species act, include the fact that some argue that if those species go extinct, there will be a tremendous effect on the environment, and that species have been going extinct for millions of years.

  • Threatened Species in Your Community

    The community that these species reside in must be educated and this is the primary means to get this species off the endangered list. References: Wisconsin Department of Natural Resources (2012). "Wisconsin Endangered and Threatened Species."

  • overpopulation of species due to human involvement

    Finally, since deer is only ONE example of the huge problem that has resulted in overpopulation of species due to human involvement, other species have become endangered or near-extinct.

  • Mammalian Evolution Multiple Choice

    In 2004, they listed 4 mammals extinct in the wild, 162 mammal species critically endangered, and 352 endangered. www.redlist.org.

  • Topics on Environmental Science

    Endangered species are plants or animals that are threatened with extinction. 3. Changes in habitat may result in endangered species. 4. Sometimes construction projects are delayed or prevented because of the presence endangered species.

  • Ethics and Endangered Species

    426583 Ethics and Endangered Species Do some research on your own about endangered species of animals and plants and think about the biological, ethical and economic aspects of the problem.

  • Extinction and protected areas

    They would argue that, while it may or may not be natural, it is the fault of humans that so many species are going extinct and that is inherently wrong. The best way to prevent species from going extinct is to keep their habitat intact.

  • Consequences of Human and Animal Interface

    527356 Endangered Species Some opponents of endangered species efforts have argued that endangered species recovery is too expensive, stands in the way of individual property rights, and produces little to no results in the recovery of endangered species

View More Related Solutions