lecture 8 2009

lecture 8 2009 - Populations III: Harvest A history of...

Info iconThis preview shows pages 1–9. Sign up to view the full content.

View Full Document Right Arrow Icon
Populations III: Harvest
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
A history of whaling 10 th Century – records of whaling 1400-1700 Atlantic Arctic fishery – targeting the right whale 1600-1900 the Pacific fishery 1800-1970s Sperm whale fishery
Background image of page 2
Sperm Whale ( Physeter macrocephalus ) Right Whale ( Eubalaena glacialis )
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
1712 – Americans hunt sperm whale 1860 – Norwegians introduce steam- powered boats and explosive harpoons Factory ships and newer technologies more species, more oceans, more countries
Background image of page 4
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
1949-1960 – IWC sets annual “fixed” quotas for all whaling 1972 - the United Nations called for a cessation of whaling and the United States Congress passed an Endangered Species Act 1987 - whale sanctuaries were declared in the 1970s and ’80s, and a general moratorium on commercial whaling, adopted by the IWC in 1982, took effect in 1987 1946 17 nations agree to let International Whaling Commission (IWC) set maximum catch in the Antarctic.
Background image of page 6
Review r = instantaneous per capita growth rate dN/dt = r(N) (exponential growth model) 0 400 800 1200 1600 02 0 4 0 Time N
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Exponential growth is rare and doesn’t last long, but does occur (Example: European rabbits in Australia)
Background image of page 8
Image of page 9
This is the end of the preview. Sign up to access the rest of the document.

This document was uploaded on 07/22/2009.

Page1 / 20

lecture 8 2009 - Populations III: Harvest A history of...

This preview shows document pages 1 - 9. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online