Lecture 2 1110

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: ecies Keystone Species Play pivotal role in structure and function of an ecosystem Interaction with other species effect health and survival of these species Process materials out of proportion to numbers or biomass Keystone Species Keystone Species Specific pollinators of flowering plant species­ bees, hummingbirds, etc. Predation by carnivores keeping populations in check Recycling of nutrients­ dung beetles recycling animal waste Habitat modification­Elephants uproot trees, open up grassland; beaver dams, Measuring Extinction Rates Measuring Extinction Rates Species/area curves­ 90% loss in area results in 50% decline in species Minimum Viable Population estimates Minimum Dynamic Area Population Viability analysis­ Risk assesment analysis to determine persistance of a population Minimum Viable Population Minimum Viable Population Smallest number of individuals necessary to ensure population survival in a region for a specific time period Most indicate a few thousand individuals are necessary for survival beyond a few decades Minimum Dynamic Area Min...
View Full Document

This note was uploaded on 12/16/2009 for the course BIOPL 2400 taught by Professor Silva,t. during the Fall '08 term at Cornell University (Engineering School).

Ask a homework question - tutors are online