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Lecture 19

BIO205 Lecture 19 (Nov 12, 2012) - EDIT.docx

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Department
Biology
Course
BIO205H5
Professor
Christoph Richter
Semester
Fall

Description
BIO205 Lecture 19 - Previously from lecture 18 o We can hypothesize how communities change based on the disturbance frequency  Every arrow represents a disturbance  Every colour curve represents a different species  With frequent disturbances, very few species survive o There is a problem with intermediate disturbances  Some species can deal with it and some can’t o Caribous don’t like any of these  Survey lines  Open cuts for power lines  Mining stations - Lecture 19: communities over large scales - Communities form landscapes o Different communities are not isolated o Ex. Pelee Island - Communities are patchy o Continuous even distribution - Glaciers left their marks o Esker o Made by rivers flowing in or under glaciers - Past influences can be human-made o Paired forested areas compared in Northern France o One of the pairs had higher pH, phosphorus and plant richness o Each pair had one area that had been used for agriculture o Agricultural areas usually have higher pH  Some fields have been abandoned for hundreds of years but even now, you can still see the differences in the soil in terms of pH level and composition - There are also current influences o American alligator o Dig holes to collect water for dry season o Ecosystem engineer - Humans have also current influences o Patches on mountains - Landscapes are made up of patches of communities and ecosystems
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