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SBI3U Ms. De Sousa. Section 1.4 classifying types of biodiversity. Identifying species. Dichotomous keys are used to identify species and their scientific names . . DICHOTOMOUS KEY EXAMPLE. 1. a. tail fins are horizontal—whale………………….go to 2

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Section 1.4 classifying types of biodiversity

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    1. SBI3U Ms. De Sousa Section 1.4 classifying types of biodiversity

    2. Identifyingspecies Dichotomouskeys are used to identifyspecies and theirscientificnames.

    3. DICHOTOMOUS KEY EXAMPLE 1. a. tail fins are horizontal—whale………………….go to 2 b. tail fins are vertical—fish……………………….go to 3 2. a. has teeth or tusk—toothed whale………………..go to 4 b. has no teeth………………………...BALEEN WHALE 3. a. has gill slits behind mouth—shark…….………...go to 5 b. has no gill slits……………………..NONSHARK FISH 4. a. black with white underside………….KILLER WHALE b. tusk, gray with dark spots………………....NARWHAL 5. a. head is hammershaped……..HAMMERHEAD SHARK b. tail is half the body length……….THRESHER SHARK

    4. Bird W: Bird Y: Bird X: Bird Z:

    5. Whatisdiversity? . . .

    6. SpeciesDiversity: the variety and abundance of species in a given area • GeneticDiversity: the variety of heritable characteristics in a population of interbreeding individuals. • EcosystemDiversity: the variety of ecosystems in the biospheres. diversity

    7. Gene pool: The differentallelesavailablewithin a given population. Represents the geneticdiversitywithin a population Geneticdiversity Gene pool Alleles Diversity

    8. Whathappens to the geneticdiversity of organismswhenthereisallopatricspeciation? When a species are separated in twodifferentregions, thereisalot of allelic variation betweenbothregions. This is due to the differentenvironmental conditions which alter the frequency of genetic information.

    9. Whatcouldbe an advantage of geneticdiversity? 1) Provideresistance to disease 2) Supports Conservation Biology

    10. 1) Providingresistance to disease When a population of specieslacksgeneticdiveristythereis a greater chance thattheywillbeaffected by a certain disease. If the diseaseleads to death, with no geneticdiversity, the speciescanbecomeextinct. Thusgeneticdiversityenablesorganisms to survive environmental changes and promotesevolution TasmanianDevil, native to southern state of Australia.

    11. Scientists’ knowledge of geneticdiversityenablesthem to developstrategiesto saveendangeredspecies. How couldscientists help increase the geneticdiversitywithin a population of species? Scientiststakespeciesfrom a different location and introducetheminto a new population. ( controlledform of gene flow). By introducing new speices, new versions of alleles are introduced to the gene pool, thusincreaseinggeneticdiversity. 2) conservation biology

    12. vocabulary Biosphere Biotic Factor Abiotic Factor Ecosystem

    13. There are a variety of ecosystemsfoundwithin the biosphere. Thusthereismuchdiversity. All ecosystemsconsists of a variety of biotic and abioticfactorsthatdifferfromsystem to system. All biotic and abioticfactors help contribute and ensure the wellfunctionning of the ecosystem. Ecosystemdiversity

    14. Ecosystemdiversity Earth’s surface canvaryphysically and chemicallydepending on the region. This variation increases the biodiversity.

    15. The Ecosystemscanprovidemanybenefits to the organismsliving withinit. All life on earthdepends on the manygoodsthat the ecosystem has to offer. Ecosystem Service: the benefitsprovided by the ecosystem to humans. Ecosystemdiversity

    16. Eachecosystemprovides a unique set of services that are essential to certain organisms. Withoutthisdiversity, these services would not beavailable and thuswouldimpact the survivalof certain organisms. Thusgovernmental and non-governmentalagenciesworktogether to ensurethattheseecosystems are preserved and protected. Ecosystemdiversity

    17. Climateregulation: the ability of an ecosystem to regulateCO2, NO2, CH4levels in the atmosphere. Pollination: Abitlity to pollinatecrops. Wilderness: providing a habitat for wildlife Food production: crops; livestock Examples of EcosystemSErvice

    18. The greater the diversity of specieswithin an ecosystem, the greateritsability to maintainequilibrium. Resilience: ability of an ecosystem to remainfunctional and stable in the presence of disturbances. The greater the diversity, the better the organismswithin the system are able to adapt, thusmaintaining the equilibirum. Ecosystem and Speciesdiversity

    19. There are times whenhumanswillenhancethe services provided by the ecosystem by introducingtheirownbenefits. Althoughthismayprovidedrecreationaladvantages to humans, itcandisrupt the entireecosystem by interfeeringwith the foodchain. Ecosystem and human action

    20. In California, scientistsintroduced a stock of non-native troutinto the lake for recreationalpurposes. Intoducing the troutdrasticallyreduced the number of amphibians and insects in the ecosystem. Ecosystem services and human actions Whycouldthis have occured?