Crustacean molting cycle - Txhua yam koj yuav tsum paub

Cov txheej txheem:

Crustacean molting cycle - Txhua yam koj yuav tsum paub
Crustacean molting cycle - Txhua yam koj yuav tsum paub
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Crustacean molting voj voog fetchpriority=siab
Crustacean molting voj voog fetchpriority=siab

Crustaceans yog ib pab pawg tsiaj uas ua rau peb xav tsis thoob nrog qhov tshwm sim tshwj xeeb, lawv lub voj voog molting. Ntawm peb lub xaib peb xav muab cov lus piav qhia txog qhov tshwm sim no uas yuav pab koj nkag siab me ntsis txog kev loj hlob ntawm pawg neeg nyiam no.

The phylum arthropoda, raws li nws lub npe qhia, yog tsim los ntawm cov tsiaj nrog ob txhais ceg. Cov tsiaj no muaj cov yam ntxwv sib koom ua ke uas lawv muaj ntau dua lossis tsawg dua chitin exoskeleton thiab lawv yuav tsum tau hloov nws kom loj hlob, thiab nyob rau hauv lub phylum no peb muaj cov crustacean chav kawm. Nyob rau hauv tsab xov xwm no peb yuav tsom mus rau cov chav kawm no los kawm txog molting, yog li tom ntej no peb yuav piav qhia the molting cycle of crustaceans Raws li xav paub, lo lus crustacean los ntawm Latin lo lus crusta, uas txhais tau tias bark.

Cov tsiaj no muaj kev tiv thaiv calcareous hu ua exoskeleton. Lub exoskeleton muab lawv cov qauv nruj thiab muaj zog tiv thaiv cov tsiaj nyeg Cov kev tiv thaiv no nruj heev kom nws dhau los ua teeb meem raws li tus neeg loj hlob, txij li cov calcareous exoskeleton tsis muaj nws stretches Txwv qhov loj ntawm tus tsiaj. Nws yuav tsum tau muab sau tseg tias nws tsis yog ib tug nruj nreem, tab sis ib tug txheej ntawm articulated daim hlau uas tso cai rau lawv mus.

Crustaceans loj hlob li cas?

Yuav kom loj hlob, crustaceans yuav tsum dhau los ntawm cov txheej txheem me me ntawm kev tshem tawm lawv cov exoskeleton qub thiab tsim ib qho tshiab. Qhov trance no suav nrog kev siv hluav taws xob loj, yog li lawv tsuas yog nqa tawm thaum tus tsiaj muaj kev noj qab haus huv zoo thiab npaj kom muaj kev loj hlob spurt. Lub sijhawm molting ntawm crustaceans, tseem hu ua ecdysis, yog shedding ntawm exoskeleton Nws yog ib qho tshwm sim tshwm sim los ntawm ntau yam exogenous thiab endogenous yam (Hopkins thiab ib., 1999). Hauv kev tshaj tawm ntawm Phau Ntawv Xov Xwm ntawm Marine Biology thiab Oceanography, nws tau raug lees paub tias cov theem lunar cuam tshuam rau lub sijhawm ntawm molting, xaus lus tias nyob rau lub quarter kawg muaj 50% molts ntau dua li lwm lub hli.

Moulting of crustaceans muaj ntau dua rau cov hluas thiab tsawg dua rau cov neeg laus uas twb tau mus txog qhov loj me. Hauv lwm pawg tsiaj, kev loj hlob yog me ntsis txuas ntxiv, tab sis nyob rau hauv cov ntaub ntawv ntawm crustaceans, molting tsim ib tug discontinuity nyob rau hauv txoj kev loj hlob.

Crustacean molting voj voog - Yuav ua li cas crustaceans loj hlob?
Crustacean molting voj voog - Yuav ua li cas crustaceans loj hlob?

Moulting phases of crustaceans

Drach txoj kev tshawb nrhiav (1939, 1944) yog thawj zaug sau cov moult ntawm crustaceans, faib ua plaub theem:

  1. Intermolt: lub suture ntawm yav dhau los moult yuav pom tab sis lub plhaub yog tag nrho nyuaj. Qhov no yog lub sij hawm txij thaum cov txheej txheem hardening ntawm lub moult kawg tau tiav mus txog rau thaum tus tsiaj yuav tsum loj hlob dua.
  2. End of intermoult and start of premoult: suture yuav ntxaum thiab cim ntau dua. Sab hauv, daim tawv nqaij sab hauv pib sib cais, ua kom tiav thiab tsaus.
  3. Premolt: cov suture yuav decalcified thiab rhiab heev. Kev pom muaj zog heev ntawm cov txheej sab hauv yog pom, uas tau txais turgidity.
  4. Ecdicis: yog lub caij uas tawg thiab tso tseg txoj qub kev qub.

Nws yuav tsum tau muab sau tseg tias ua ntej plaub theem no tshwm sim phase 0, hu ua post moult, nyob rau hauv uas ib tug du suture yuav pom ntawm cov kab cleavage qhov twg cov crustacean tau tawg los ntawm ancient exoskeleton. Lub plhaub tseem mos maj mam hardens, nws yuav siv li ob peb hnub.

Thaum lub sijhawm moulting, tus neeg tswj kom tawg lub plhaub qub rau ob qho laj thawj tseem ceeb. Thawj yog qhov scidial suture ntawm yav dhau los molt tau decalcified, tawm hauv nws ntau zog. Yuav kom tawg nws, nws swells thiab stretches nrog kev pab los ntawm spasmodic txav. Lawv kuj nyiam nqos dej ntau uas pab lawv ua kom lub siab nyob rau hauv lub exoskeleton thiab ua rau nws tawg.

Thaum lawv tso tus qub exoskeleton lawv rov qab mus rau theem 0. Lub caij no lawv tseem mos thiab ncab mus txog qhov kawg, loj hlob yam uas lawv lub cev xav tau. Lub sijhawm no yog lub sijhawm uas muaj kev phom sij heev, yog li lawv nyiam siv nws nkaum hauv qhov chaw tsim nyog rau cov hnub tsim nyog kom txog thaum lawv tawv tag.

Kom nkag siab tias lub voj voog crustacean molting muaj li cas, nws muaj peev xwm sab laj nrog cov kev sim hauv qab no ntawm kev saib xyuas kev loj hlob ntawm pob zeb roob ris ntev li 300 hnub:

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