Video: Dab tsi yog thaj chaw ntawm pej xeem kev hloov pauv thiab vim li cas nws thiaj li muaj txiaj ntsig thaum kawm txog pej xeem?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Population dynamics yog ceg ntawm life sciences uas kawm txog qhov loj thiab hnub nyoog muaj pes tsawg leeg cov pejxeem raws li lub tshuab hluav taws xob, thiab cov txheej txheem lom neeg thiab ib puag ncig tsav lawv (xws li kev yug me nyuam thiab kev tuag, thiab los ntawm kev nkag tebchaws thiab kev tsiv teb tsaws chaw).
Tsuas yog li ntawd, vim li cas nws thiaj tseem ceeb rau kev kawm txog cov pej xeem dynamics?
Lawv kuj cuam tshuam rau kev thov rau lwm yam kev pab cuam ntuj tsim vim, rau ib qho kev sib xyaw ua ke ntawm cov cuab yeej siv, cov qauv siv hluav taws xob, thiab kev koom tes hauv zej zog, pej xeem tuaj yeem muaj tseem ceeb multiplying teebmeem nyob rau hauv relation mus thoob ntiaj teb hloov.
Dab tsi yog qhov dynamics ntawm pej xeem kev loj hlob? Mortality, fertility, thiab migration yog peb yam tseem ceeb ntawm kev loj hlob ntawm pej xeem . Hauv tshooj no theory of pejxeem dynamics raug suav hais tias yog ib thaj chaw ntawm kev siv cov ntaub ntawv kev tuag.
Tom qab ntawd, ib tug kuj yuav nug, vim li cas nws tseem ceeb kom nkag siab tias cov pejxeem loj hlob li cas?
Nkag siab txog kev loj hlob ntawm pej xeem yog tseem ceeb vim cov pejxeem ntawm ntau hom sib cuam tshuam thiab cuam tshuam ib leeg, suav nrog tib neeg cov pejxeem . Seb a pejxeem loj hlob los yog kev poob qis nyob ntawm kev yug, kev tuag, kev tsiv teb tsaws chaw, thiab kev tsiv teb tsaws chaw. Kev nkag tebchaws yog kev txav ntawm cov tib neeg mus rau hauv ib qho pej xeem.
Vim li cas thiaj tseem ceeb rau kev kawm txog pej xeem ecology?
Pej xeem ecology yog tseem ceeb nyob rau hauv kev txuag biology, tshwj xeeb tshaj yog nyob rau hauv txoj kev loj hlob ntawm pej xeem Kev soj ntsuam kev muaj sia nyob (PVA) uas ua rau nws muaj peev xwm kwv yees qhov yuav tshwm sim ntev ntawm ib hom kab mob nyob hauv ib thaj chaw nyob.
Pom zoo:
Vim li cas peb thiaj li hais txog kev txwv tsis pub muaj kev hais tawm thiab thaum twg peb yuav hais cov kev txwv?
Peb hais txog kev txwv vim nws yuav ua rau qhov sib npaug tsis tau txhais hauv qee qhov txiaj ntsig ntawm x. Qhov kev txwv ntau tshaj plaws rau cov lus qhia muaj nuj nqis yog N / 0. Qhov no txhais tau tias txhua tus lej muab faib los ntawm xoom tsis tau txhais. Piv txwv li, rau txoj haujlwm f(x) = 6/x², thaum koj hloov x = 0, nws yuav ua rau 6/0 uas tsis tau txhais
Dab tsi yog qhov txawv ntawm ib puag ncig kev hloov pauv thiab kev hloov pauv qub txeeg qub teg?
Qhov sib txawv ntawm cov yam ntxwv ntawm cov tib neeg ntawm tib hom yog hu ua variation. Qhov no yog inherited variation. Qee qhov kev hloov pauv yog qhov tshwm sim ntawm qhov sib txawv ntawm ib puag ncig, lossis ib tus neeg ua dab tsi. Qhov no yog hu ua environmental variation
Dab tsi tsim cov roj siab thiab nws hloov pauv li cas nrog kev hloov pauv hauv kinetic zog?
Gas siab yog tshwm sim los ntawm kev sib tsoo ntawm cov khoom siv roj nrog rau sab hauv ntawm lub thawv thaum lawv sib tsoo nrog thiab tawm dag zog rau ntawm phab ntsa ntim. Tom qab ntawd cov roj yog cua sov. Raws li qhov kub ntawm cov roj nce, cov khoom tau nce lub zog kinetic thiab lawv cov nrawm nrawm
Thaum ib qho kev sib cais ua rau muaj kev hloov pauv hloov pauv ntawm lub ntiaj teb nce ntxiv?
Txij li thaum lub kaw lus raug cais tawm, tsis muaj cua sov tuaj yeem khiav tawm (tus txheej txheem yog li adiabatic), yog li thaum lub zog ntws tawm hauv lub cev, qhov entropy ntawm qhov system nce, piv txwv li Δ Ssys> 0. Yog li ntawd, lub entropy ntawm lub system yuav tsum tau nce rau ib tug spontaneous txheej txheem nyob rau hauv no cais system
Vim li cas thiaj tseem ceeb heev rau cov neeg nyob hauv thaj chaw los kawm txog cov pejxeem ntawm ib lub tebchaws?
Vim cov pej xeem muaj kev cuam tshuam loj heev rau peb lub neej, nws yog ib feem tseem ceeb ntawm thaj chaw.Geographers uas kawm tib neeg cov pej xeem tshwj xeeb tshaj yog nyiam cov qauv uas tshwm sim dhau sijhawm. Lawv kawm cov ntaub ntawv xws li muaj pes tsawg tus neeg nyob hauv ib cheeb tsam, yog vim li cas tib neeg nyob qhov twg lawv ua, thiab cov pej xeem hloov pauv li cas