REPRODUCTION of AMPHIBIANS - Hom thiab cov duab

Cov txheej txheem:

REPRODUCTION of AMPHIBIANS - Hom thiab cov duab
REPRODUCTION of AMPHIBIANS - Hom thiab cov duab
Anonim
Kev tsim tawm ntawm amphibians fetchpriority=siab
Kev tsim tawm ntawm amphibians fetchpriority=siab

Ib qhov zoo ntawm evolution tau kov yeej lub ntiaj teb ib puag ncig los ntawm cov tsiaj. Txoj kev los ntawm dej mus rau hauv av yog undoubtedly ib tug tshwj xeeb tshwm sim uas hloov txoj kev loj hlob ntawm lub neej nyob rau hauv lub ntiaj teb no. Tab sis cov txheej txheem kev hloov pauv zoo no tau tso qee cov tsiaj txhu nrog cov qauv nruab nrab ntawm lub cev nruab nrab ntawm dej thiab av, uas, txawm hais tias tau hloov mus rau thaj chaw hauv av, feem ntau txuas nrog dej, feem ntau yog rau kev yug me nyuam.

Cov saum toj no hais txog amphibians, uas nws lub npe yog los ntawm lawv ob lub neej, dej thiab av, tsuas yog vertebrates uas tam sim no muaj peev xwm metamorphosing. Amphibians yog cov pab pawg ntawm tetrapods, lawv yog anamniotes (tsis muaj amniotic sac), txawm hais tias muaj qee qhov kev zam thiab feem ntau ua pa los ntawm gills hauv theem larval, tab sis nyob rau hauv txoj kev pulmonary tom qab metamorphosis. Hauv tsab xov xwm no ntawm peb lub xaib, peb xav kom koj paub yuav ua li cas cov tsiaj no yug me nyuam, vim nws yog ib qho ntawm cov yam ntxwv uas ua rau lawv txuas mus rau ib puag ncig aqueous. Mus nyeem ntawv thiab kawm txog reproduction of amphibians

Tam sim no, amphibians tau muab tso rau hauv Lissamphibia, thiab qhov no tig ceg lossis faib ua peb:

  • Gymnophiona: lawv feem ntau hu ua caecilians thiab yog yam ntxwv los ntawm legless. Tsis tas li ntawd, lawv yog cov uas muaj hom tsawg tshaj plaws.
  • Caudata: cov no correspond to salamanders or newts.
  • Anura: Qhov no sib raug rau cov qav thiab cov toads. Txawm li cas los xij, nws yuav tsum tau muab sau tseg tias ob lo lus no tsis muaj kev siv tau los ntawm taxonomic, tab sis yog siv los txheeb xyuas cov tsiaj me nrog cov tawv nqaij du, moist ntawm cov tawv nqaij qhuav, tawv tawv.

Yog xav paub ntxiv, peb xav kom koj nyeem lwm tsab xov xwm ntawm Cov yam ntxwv ntawm amphibians.

Type of amphibian reproduction

Tag nrho cov tsiaj no muaj ib hom , txawm li cas los xij, lawv nthuav tawm ntau hom kev ua me nyuam. Ntawm qhov tod tes, txawm hais tias nws yog ib qho kev ntseeg tias txhua tus amphibians yog oviparous, nws yuav tsum tau ua kom paub meej txog qhov no.

Puas yog amphibians oviparous?

Caecilians muaj fertilization sab hauv, tab sis tuaj yeem ua tau oviparous lossis viviparousRau lawv feem, salamanders tuaj yeem muaj kev sib xyaw ua ke sab hauv lossis sab nraud, thiab nyob rau hauv cov nqe lus ntawm kev hloov ntawm embryonic txoj kev loj hlob, lawv nthuav tawm ntau txoj hauv kev nyob ntawm hom: qee qhov nteg qe fertilized uas tsim sab nraud (oviparity), lwm tus khaws cov qe hauv lub cev. ntawm cov poj niam, tshem tawm lawv thaum cov larvae tau tsim (ovoviviparity) thiab lwm yam lawv khaws cov larvae nyob rau hauv kom txog thaum lawv raug metamorphosis, tshem tawm tag nrho cov neeg tsim (viviparity).

Raws li cov anurans, lawv feem ntau yog oviparous thiab nrog rau sab nraud fertilization, tab sis kuj muaj qee hom nrog fertilization sab hauv, thiab cov mob viviparity kuj tau txheeb xyuas.

Peb twb paub lawm tias amphibians nthuav tawm ntau hom kev yug me nyuam, tab sis cia peb kawm ntxiv txog yuav ua li cas amphibians reproduce.

Caecilian reproduction

Cov txiv neej caecilians muaj copulatory organ uas lawv fertilize cov poj niam. Qee hom nteg qe hauv qhov chaw ntub dej lossis ze dej thiab cov poj niam saib xyuas lawv cov qe. Tseem muaj lwm yam uas cov poj niam muaj viviparous thiab khaws cov larvae nyob rau hauv lawv oviduct txhua lub sij hawm, txij li thaum lawv pub.

Reproduction of caudates

Raws li cov caudates, ib tug txo tus naj npawb ntawm hom nthuav tawm sab nraud fertilization, thaum feem ntau tam sim no fertilization sab hauv Tus txiv neej, tom qab nqa tawm ntawm kev sib tham, nws tawm ntawm cov spermatophore feem ntau ntawm nplooj lossis ceg kom nws tom qab coj los ntawm tus poj niam. Ces, cov qe yuav fertilized nyob rau hauv lub cev ntawm lub neej yav tom ntej niam.

Ntawm qhov tod tes, qee hom salamanders ua lub neej nyob hauv dej thiab tso lawv cov qe hauv qhov chaw no, tso rau hauv pawg lossis pawg, thiab los ntawm cov larvae no yuav tawm nrog gills thiab tus Tsov tus tw hauv lub zoo li tus fin. Tab sis lwm cov salamanders ua rau cov neeg laus hauv lub neej tom qab ua tiav cov metamorphosis. Cov tom kawg nteg lawv cov qe rau hauv av hauv daim ntawv me me, feem ntau nyob rau hauv cov av ntub dej, cov av mos los yog hauv cov cav ntub.

Ntau hom yuav khaws lawv cov qe rau kev tiv thaiv thiab, nyob rau hauv cov ntaub ntawv no, lub larval development tshwm sim tag nrho hauv lub qe, yog li cov tib neeg. nrog ib tug zoo xws li cov neeg laus hatch los ntawm no. Cov xwm txheej kuj tau txheeb xyuas qhov uas tus poj niam tswj tus menyuam mos thaum lawv loj hlob mus rau cov neeg laus, thaum lub sijhawm nws tshem tawm lawv.

Reproduction of anurans

Txiv neej anurans, raws li peb tau hais, feem ntau fertilize lub qe sab nraud, txawm tias ob peb hom ua li ntawd sab hauv. Cov no nyiam cov poj niam los ntawm kev tso tawm ntawm lawv cov nkauj, thiab thaum nws npaj txhij, nws yuav mus txog thiab lub amplexus yuav tshwm sim, uas yog qhov chaw ntawm tus txiv neej ntawm tus poj niam, yog li ntawd thaum nws tso cov qe, txiv neej fertilize lawv.

Cov oviposition ntawm cov tsiaj no tuaj yeem tshwm sim hauv ntau txoj hauv kev: qee zaum nws yog dej, uas suav nrog ntau txoj hauv kev tso qe, lwm qhov nws tshwm sim hauv npuas zes ntawm dej thiab tuaj yeem ua tau arboreal. los yog av. Kuj tseem muaj qee qhov xwm txheej uas tshwm sim ntawm tus menyuam mos ntawm daim tawv nqaij.

Kev yug me nyuam ntawm amphibians - Yuav ua li cas yug me nyuam ntawm amphibians?
Kev yug me nyuam ntawm amphibians - Yuav ua li cas yug me nyuam ntawm amphibians?

Vim li cas dej thiaj li tsim nyog rau amphibians yug dua tshiab?

Tsis zoo li cov tsiaj reptiles thiab noog, amphibians tsim qe yam tsis muaj lub plhaub lossis tawv npog uas nyob ib puag ncig lub embryo ntawm cov tsiaj no. Qhov no, ntxiv rau qhov tso cai rau kev sib pauv roj nrog rau sab nraud vim tias nws yog ntxeem tau, muaj kev tiv thaiv siab tiv thaiv ib puag ncig qhuav lossis qee theem ntawm qhov kub thiab txias.

Embryonic txoj kev loj hlob ntawm amphibians

Vim cov saum toj no, kev loj hlob ntawm embryonic ntawm amphibians yuav tsum tshwm sim nyob rau hauv ib tug aqueous nruab nrab los yog nyob rau hauv ib puag ncig humidkom cov qe tiv thaiv, feem ntau tiv thaiv tsis ya raws, uas yuav ua rau tuag taus rau lub embryo. Tab sis raws li peb twb paub lawm, muaj amphibian hom uas tsis muab tso rau hauv dej. Hauv cov xwm txheej no, qee cov tswv yim muaj xws li ua nws hauv qhov chaw ntub dej, hauv av lossis npog los ntawm cov nroj tsuag. Lawv kuj tuaj yeem tsim cov qe ntau hauv cov gelatinous loj, muab cov xwm txheej zoo rau kev loj hlob. Txawm tias hom anurans tau raug txheeb xyuas tias nqa dej mus rau thaj chaw thaj av uas cov qe tsim.

Cov vertebrates no yog ib tug piv txwv tseeb hais tias lub neej nrhiav cov evolutionary mechanisms tsim nyog los hloov thiab txhim kho nyob rau hauv lub ntiaj teb no, uas yog pom meej nyob rau hauv nws ntau yam ntawm reproducing, uas yog ib tug endless tswv yim rau perpetuation ntawm pab pawg neeg.

Kev yug me nyuam ntawm amphibians - Vim li cas dej thiaj tsim nyog rau kev yug me nyuam ntawm amphibians?
Kev yug me nyuam ntawm amphibians - Vim li cas dej thiaj tsim nyog rau kev yug me nyuam ntawm amphibians?

Amphibian kev txuag xwm txheej

Ntau hom amphibians tau cataloged rau ib co degree ntawm txaus ntshai ntawm extinction, feem ntau yog vim lawv dependence rau lub cev ntawm dej thiab susceptibility. uas tej zaum yuav yog vim muaj kev hloov loj heev uas tam sim no tshwm sim hauv cov dej ntws, pas dej thiab cov av ntub dej.

Nyob rau hauv qhov kev txiav txim siab no, yuav tsum muaj kev quab yuam kom tsis txhob muaj kev puas tsuaj uas cov ecosystems raug cuam tshuam los txhawm rau khaws cov amphibians thiab lwm yam tsiaj uas nyob ntawm cov chaw nyob.

Pom zoo: