On the termination of species
This presentation is the property of its rightful owner.
Sponsored Links
1 / 18

On the Termination of Species PowerPoint PPT Presentation


  • 54 Views
  • Uploaded on
  • Presentation posted in: General

On the Termination of Species. 0. Current Issues in Biology, Volume 1 Scientific American. On the Termination of Species. 0. Concept Review. Oxford zoologist Robert M. May and other scientists claim that humans could be causing the sixth great wave of mass extinctions on Earth.

Download Presentation

On the Termination of Species

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


On the termination of species

On the Termination of Species

0

Current Issues in Biology, Volume 1

Scientific American


On the termination of species1

On the Termination of Species

0

Concept Review

  • Oxford zoologist Robert M. May and other scientists claim that humans could be causing the sixth great wave of mass extinctions on Earth.

  • May estimates that the extinction rate of organisms on Earth has accelerated during the past 100 years to roughly 1,000 times what it was before humans showed up.


On the termination of species2

On the Termination of Species

0

Concept Review

  • Most scientists identify five major mass extinctions in Earth’s history. A mass extinction is any set of events that leads to the extinction of a significant number of species.


On the termination of species3

On the Termination of Species

0

Concept Review

  • Some scientists dispute the claim that the Earth is currently experiencing a mass extinction event-this time, caused by humans.

  • These scientists have reported that the methods used to calculate extinction rates are flawed by false assumptions.


On the termination of species4

On the Termination of Species

0

Concept Review

  • Two factors that compound the problem of estimating extinction are

    • The enormous number of species on the Earth

    • Many of those species are not yet identified.


On the termination of species5

On the Termination of Species

0

Concept Review

  • Habitat loss due to human development has long been thought to contribute to extinction (the “species-area relation”), but recent data has also proven inconclusive.


On the termination of species6

On the Termination of Species

0

Concept Review

  • However, annual forest loss has declined somewhat in recent years.

  • Although projections of extinction rates have been inconsistent, biology have good reasons to fear that if a mass extinction hasn’t begun yet, it is imminent.


On the termination of species7

On the Termination of Species

Concept Review

  • A goal of many scientists has been to promote the importance of species and habitat conservation.

  • Edward O. Wilson, a Harvard professor states, “It turns out to be a lot easier to persuade a corporate CEO or a billionaire of the importance of the issue than it is to convince the American public.”


On the termination of species

On the Termination of Species

Testing Your Comprehension

  • How many mass extinctions are known from the fossil record?

    • a) 1

    • b) 5

    • c) 11

    • d) 46


On the termination of species

On the Termination of Species

Testing Your Comprehension

  • How many mass extinctions are known from the fossil record?

    • b) 5


On the termination of species

On the Termination of Species

Testing Your Comprehension

Which kind of organism comes in more species that the total

species of all the other multicellular organisms combined?

a) Insects

b) Fungi

c) Nematodes

d) Protozoa


On the termination of species

On the Termination of Species

Testing Your Comprehension

Which kind of organism comes in more species that the total

species of all the other multicellular organisms combined?

a) Insects


On the termination of species

On the Termination of Species

Testing Your Comprehension

  • What does the “species-area relation” say about the

  • relationship between habitat loss and species extinction?

    • a) As habitat area is lost, the number of species living in it decreases.

    • b) As habitat area is lost, the number of species living in it increases.

    • c) As habitat area is lost, the number of species living in it does not change.

    • d) As habitat area is gained, the number of species living in it decreases.


On the termination of species

On the Termination of Species

Testing Your Comprehension

  • What does the “species-area relation” say about the

  • relationship between habitat loss and species extinction?

    • a) As habitat area is lost, the number of species living in it decreases.


On the termination of species

Strongly

Agree

Strongly

Disagree

A.

D.

C.

B.

E.

On the Termination of Species

Biology In Society

  • Given that estimates of extinction rates are uncertain, do

  • you think it is a good idea to base public policies on the

  • assumption that species are, in fact, disappearing at

  • an increasing rate?


On the termination of species

On the Termination of Species

Thinking About Science

  • Which of the following is NOT a common argument made by

  • conservationists in favor of maintaining species diversity?

  • a)Most of our drugs are derived from natural species.

    • b)Whole ecosystems provide irreplaceable services to the biosphere.

    • c)Humans have a moral obligation to act as stewards for the diversity of life.

    • d)Human nutrition depends upon having a wide variety of natural species to eat.


On the termination of species

On the Termination of Species

Thinking About Science

  • Which of the following is NOT a common argument made by

  • conservationists in favor of maintaining species diversity?

    • d)Human nutrition depends upon having a wide variety of natural species to eat.


On the termination of species8

On the Termination of Species

Thinking About Science

Scientists often become advocates for conservation. How

might advocacy for a cause such as conservation lead to

bias in the research related to the so-called biodiversity

crisis?


  • Login