2024 Tus sau: Elizabeth Oswald | [email protected]. Kawg hloov kho: 2024-01-13 00:07
Coral bleaching tshwm sim thaum coral poob lawv cov xim vibrant thiab tig dawb. … Coral yog ci thiab muaj yeeb yuj vim yog microscopic algae hu ua zooxanthellae. Zooxanthellae nyob hauv coral hauv kev sib raug zoo, txhua tus pab kom muaj sia nyob.
Yuav ua li cas rau coral thaum nws bleached?
Bleached corals tuaj yeem tsis muaj zog los ntawm photosynthesis lawm, thiab yog tias cov tshuaj dawb nyob rau lub sijhawm ntev, corals yuav tshaib plab thiab tuag. Rau cov neeg uas muaj sia nyob, tshuaj dawb tuaj yeem ua rau lub zog ntawm cov corals mus rau qhov uas corals tsis rov tsim dua ib lossis ob xyoos.
Dab tsi tso tawm thaum lub sij hawm coral bleaching?
Thaum dej sov dhau lawm, corals yuav tshem tawm cov algae (zooxanthellae) nyob hauv lawv cov ntaub so ntswg ua rau coral tig dawb. Qhov no yog hu ua coral bleaching. Thaum lub coral bleaches tsis tuag.
3 qhov ua rau coral bleaching yog dab tsi?
Dej muaj kuab paug, kev nuv ntses ntau dhau thiab kev loj hlob ntawm ntug hiav txwvtab tom ua rau lawv tus xov tooj hu rau coral reefs hauv zos, thaum cov pa roj carbon monoxide ua phem rau cov pob zeb thoob ntiaj teb thiab tseem yog lawv qhov kev hem thawj loj tshaj plaws. Cov pa roj carbon monoxide ua kom sov peb cov dej hiav txwv thiab ua rau cov pob zeb thoob plaws ntiaj teb ua kom dawb huv.
Npauj npaim dab tsi cuam tshuam los ntawm tshuaj dawb?
Ntshav pob zeb bleaching cuam tshuam rau hauv nruab nrab thib peb ntawm Great Barrier Reef thaum ntxov 2017 cuam tshuamnrog txawv txawv sov hiav txwv saum npoo qhov kub thiab txias kub ntxhov siab. Qhov no rov qab-rau-rov qab (2016 thiab 2017) cov tshuaj dawb huv yog qhov tsis tau muaj dua los thiab koom ua ke cuam tshuam ob feem peb ntawm Great Barrier Reef.
Pom zoo:
Thaum kev poob nyiaj poob haujlwm ib txwm yuav saib?
Thaum muaj kev lag luam poob qis, ib tus yuav pom ntau zaus: tus nqi poob haujlwm yuav nce ntxiv thaum cov khoom lag luam tag nrho poob. Thaum cov kws lag luam ntsuas kev lag luam loj hlob, lawv feem ntau siv: GDP tiag. Yuav ua li cas thaum muaj kev poob nyiaj txiag?
Puas yog txoj kev tsheb ciav hlau sab hnub poob puas poob franchise?
Ib lub tuam txhab tsheb ciav hlau tau hais tias nws tuaj yeem poob nws txoj haujlwm franchise tom qab tshaj tawm £ 137m poob. South Western Railway (SWR) tau hais tias nws tab tom tham nrog tsoomfwv txog yav tom ntej ntawm daim ntawv cog lus, uas yuav dhau mus rau xyoo 2024.
Vim li cas paraquat ua rau coral bleaching?
Kev piav qhia: Paraquat tsis ua rau coral bleachingvim Paraquat yog tshuaj tua kab mob uas siv los tua tshuaj ntsuab tam sim no hauv teb. Yog tias peb siv tshuaj tua kab mob Paraquat ces tsis muaj kev cuam tshuam rau coral vim hais tias cov algae nyob hauv coral tsis tua los ntawm cov tshuaj tua kab no.
Thaum twg coral bleaching tshwm sim?
Coral bleaching tshwm sim thaum coral raug kev ntxhov siab los ntawm kev hloov ntawm ib puag ncig. Lawv tshwm sim los ntawm kev tshem tawm cov symbiotic algae uas nyob hauv lawv cov ntaub so ntswg thiab tom qab ntawd tig dawb tag. Cov symbiotic algae, hu ua zooxanthellae, yog photosynthetic thiab muab lawv cov tswv coral nrog zaub mov rov qab rau kev tiv thaiv.
Puas diuron ua rau coral bleaching?
Kev raug rau siab dua (100 thiab 1000 µg l - 1 ) diuron concentrations rau 96 h ua rau txo qis hauv ΔF/F m ¹, qhov piv tau hloov pauv mus rau qhov siab tshaj plaws fluorescence (F v /F m), ib qho tseem ceeb poob ntawm symbiotic dinoflagellates thiab hais tawm cov ntaub so ntswg retraction, ua rau cov corals daj ntseg los yog bleach.
