The two great destroyers of biodiversity are 1

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: t destroyers of biodiversity are: 1. habitat destruction, THE PROBLEM OF INTRODUCED SPECIES • • • • • • • Zebra mussels Introduced from Caspian Sea Ballast water 750,000 per m2 Reduce phytoplankton levels Loss of fish Cover every hard surface • Clogged water intake pipes and 2. invasion by exotic species” • The Nature Conservancy / University of California, Davis Wildland Invasive Species Team • http:// tncweeds .ucdavis .edu European bull thistle in Yosemite National Park THE PROBLEM OF INTRODUCED SPECIES • African honeybee • Wanted to cross-breed with honey-bee • Escaped • Aggressive towards humans and animals • Ten deaths in U.S. Invasive? Invasive Introduced Species Terms: • Weed : an organism growing in a given area where it is not wanted by humans. May be native or non-native. • Introduced / Non-native / Exotic / Alien / Non-indigenous: species introduced to an area outside their original range by human activity — introduced directly or indirectly / intentionally or unintentionally. • Invasive: non-native species that spreads from its site of introduction Invasive: non-native into new areas. – Some authors limit this definition to those species having a measurable effect on native wild communities. – By either definition, only a tiny fraction of the tens of thousands of introduc...
View Full Document

This note was uploaded on 09/02/2011 for the course BIOL 6C taught by Professor Sundram during the Spring '09 term at DeAnza College.

Ask a homework question - tutors are online