Lab 12 Evolution Copmuter Lab - EVOLUTION OF DARWIN'S...

This preview shows page 1 - 4 out of 10 pages.

EVOLUTION OF DARWIN’S FINCHESLab 1212-1Reminders!CalculatorMemory Stick or Floppy DiskThis assignment will still be due in oneweek despite not meeting for next week’slab.Ask your TA for details.By now you should have purchased the EvolutionOn-line Lab Manual, USED VERSIONS DONOT WORK (the username and password havebeen reset by the publishing company).If youbought a manual with a partner, be sure that bothparties have read it in order to prepare for class!To access the lab type in the web address:http:// biologylab.awlonline.com/For first time only, you will need toregister andset up your username & password. To register,click on:You are then asked to enter the access code toinitialize your subscription, which is good for oneyear from the starting date. The access code islocated on the first page of the manual.Click on theEvolution Lablinkbackon the mainpage (at ) tobegin the lab and then login by entering yourusername and password. Follow the assignmentsin this manual and refer to the On-line Manualonly when asked.The Evolution On-line Manual allows you toexport Graphs and data into Excel.Graphs canalso be inserted into a word document bypressing the ‘Print Screen’ button to capturethe graph and then use the paste command inMicrosoft Word.In the following exercises you will investigatenatural selection of finches on Darwin and Wallaceislands in the Galapagos. This computer simulationis based on many decades of ecological fieldresearch focused on how the finches respond to achanging environment. In the simulation, you willadjust environmental parameters such as rainfalland island size, phenotypic and genetic variablessuch as beak size and heritability, and observe theireffects over time on finch populations.The amount of rainfall affects the type of seeds thatare produced by plants on an island (see Table I).Hard seeded plants survive better in a dry climatebecause the embryo is better protected fromdesiccation, while soft seeded plants survive betterin a wet climate because they can often germinatemore quickly. Obviously, the finches’ beakstructure determines the type of seeds that they canconsume (see Table II). A finch with a thick, broadbeak can crack open large, hard seeds but it isinefficient at handling smaller, soft seeds comparedto a finch with a smaller beak (recall the OptimalForaging Lab).Table I.Optimal growing conditions for seeds grown onDarwin and Wallace Island.Seed TypeOptimal GrowthharddryintermediatemoderatesoftwetTable II.Finches seed use efficiency based on beak type.Beak TypeSeedsThick (deep)HardSmall (shallow)SoftThe default settings for the On-line Manual are asfollows:Beak size = 12 mmVariance = 1Heritability = 0.7Clutch Size = 10Island Size = 0.5 kmPopulation Size = 200Precipitation = 20 cm
Laboratory 12Evolution of Darwin’s Finches12-2
Laboratory 12Evolution of Darwin’s Finches12-3NAME: _________________________________Assignment 1

Upload your study docs or become a

Course Hero member to access this document

Upload your study docs or become a

Course Hero member to access this document

End of preview. Want to read all 10 pages?

Upload your study docs or become a

Course Hero member to access this document

Term
Fall
Professor
Fukami
Tags
Ecology, Evolution, Darwin, World population, finch, 3rd millennium, beak size, Darwin Island Wallace Island

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture