-Delile
- Ukukhiqizwa kabusha kwe-Starfish
- Ihlangana kanjani i-starfish?
- Ingabe i-starfish i-oviparous noma i-viviparous?
- Yini ukukhiqizwa kabusha kwe-starfish nge-asexual?
- Starfish ezishintshayo
- I-Starfish nokukhiqizwa kabusha kwe-asexual
I-Starfish (i-Asteroidea) ingesinye sezilwane eziyimfihlakalo kunazo zonke. Ngokubambisana nama-urchins, ama-urchins namakhukhamba asolwandle, bakha iqembu lama-echinoderms, iqembu lama-invertebrate acasha phansi olwandle. Kuvamile ukuwabona osebeni olunamadwala njengoba ehamba kancane kakhulu. Mhlawumbe yingakho kubiza thina kakhulu ukucabanga kunjani ukukhiqizwa kabusha kwe-leashes.
Ngenxa yendlela yazo yokuphila, lezi zilwane ziphindaphindeka ngendlela exakile futhi ethakazelisayo. Banokukhiqizwa ngokobulili, njengathi, yize futhi bekhula ngokweqile, okungukuthi, bayazenzela. Ufuna ukwazi ukuthi kanjani? Ngakho-ke ungaphuthelwa le ndatshana yePeritoAnimal mayelana ukukhiqizwa kabusha kwe-starfish: incazelo nezibonelo.
Ukukhiqizwa kabusha kwe-Starfish
Ukukhiqizwa kabusha kwe-Starfish kuqala lapho kunezimo ezifanele zemvelo. Iningi lazo lizala ngenkathi eshisayo yonyaka. Futhi, abaningi bakhetha izinsuku eziphezulu zamaza. Kepha kuthiwani ngokuzala kwe-starfish? Okwakho uhlobo oluphambili lokuzala kabusha olwezocansi futhi kuqala ngokufuna abantu bobulili obuhlukile.
lezi zilwane zasolwandle abe nobulili obuhlukene, okungukuthi, kukhona abesilisa nabesifazane, ngokunye okuhlukile kwe-hermaphrodite.[1] Ukulandelela imikhondo yamahomoni namanye amakhemikhali[2], i-starfish ibekwa ezindaweni ezinhle kakhulu zokukhiqiza kabusha. Zonke izinhlobo ze-starfish zakha amaqembu amancane noma amakhulu abizwa ngokuthi "ukuhlanganiswa okuzala"lapho abesilisa nabesifazane behlangana khona. Kusukela kulo mzuzu kuqhubeke, uhlobo ngalunye lukhombisa amasu ahlukene wokubhangqa.
Ihlangana kanjani i-starfish?
Ukukhiqizwa kabusha kwe-starfish kuqala lapho abantu abaningi bejoyina ndawonye emaqenjini amaningi kakhulu ukuqala inqubo yokukhasa ngaphezulu komunye nomunye, bathinta futhi baphazamisa izingalo zabo. Laba oxhumana nabo nemfihlo yezinto ezithile kubangela ukukhishwa okuvumelanisiwe kwama-gametes ngabo bobabili abesilisa nabesifazane: abesifazane badedela amaqanda abo nabesilisa bakhipha isidoda sabo.
Ama-gametes ahlangana emanzini, okwenzeka okuthiwa ukukhulelwa kwangaphandle. Kusukela kulo mzuzu kuqhubeke, umjikelezo wempilo we-starfish uqala. Akukho ukukhulelwa: imibungu yakha futhi ikhule emanzini noma, ezinhlotsheni ezimbalwa, emzimbeni womzali. Lolu hlobo lokubhanqa lubizwa pseudocopulation, njengoba kukhona ukuxhumana ngokomzimba kepha akukho ukungena.
Kwezinye izinhlobo, njengenkanyezi yesihlabathi (archaster ejwayelekile), i-pseudocopulation yenzeka emibhangqwaneni. Eyodwa owesilisa ume phezu kowesifazane, ukungena ezingalweni zabo. Kubonwe ngaphezulu, kubukeka njengenkanyezi ekhonjiwe eyishumi. Zingahlala kanjena usuku lonke, kangangoba zivame ukumbozwa isihlabathi. Ekugcineni, njengasesimweni esedlule, bobabili bakhulula ama-gametes abo kanye nokukhulelwa kwangaphandle kuyenzeka.[3]
Kulesi sibonelo sezinkanyezi zesihlabathi, yize ukumataniswa kwenzeka ngababili, kungenzeka futhi ngamaqembu. Ngale ndlela, andisa amathuba abo okuzala, kanye nokuba nabalingani abaningi ngesikhathi esifanayo sokuzala. Ngakho-ke, i-starfish ikhona izilwane zesithembu.
Ingabe i-starfish i-oviparous noma i-viviparous?
Manje njengoba sesikhulume nge-starfish nokuzala kwabo, sizothatha omunye umbuzo ovame kakhulu ngabo. Iningi ye-starfish i-oviparous, okusho ukuthi, zibekela amaqanda.Kusukela ekuhlanganisweni kwesidoda namaqanda akhululiwe, inani elikhulu lamaqanda liyakhiwa. Imvamisa zibekwa phansi olwandle noma, ezinhlotsheni ezimbalwa, ezakhiweni ezichanyuselwa abazali bazo emizimbeni yazo. Lapho zichanyuselwa, azibukeki njengezinkanyezi esazi sonke, kodwa izibungu zeplanktonic ukuthi ukubhukuda adrift.
Izibungu ze-Starfish zingamazwe amabili, okungukuthi, imizimba yazo ihlukaniswe yaba izingxenye ezimbili ezilinganayo (njengathi bantu). Umsebenzi wawo ukusabalalisa ngaphesheya kolwandle, ukwenza amakoloni izindawo ezintsha. Njengoba benza lokhu, bayondla futhi bakhule kuze kufike isikhathi sokukhula babe ngabantu abadala. Ngenxa yalokhu, bacwila ekujuleni kolwandle bese behlushwa a inqubo ye-metamorphosis.
Okokugcina, yize kuyivelakancane kakhulu, kufanele sikusho lokho ezinye izinhlobo phakathi kwezinhlobo ze-starfish ziyi-viviparous. Kuyindaba ye- patiriella vivipara, onzalo yabo ikhula ngaphakathi kwama-gonads wabazali babo.[4] Ngale ndlela, lapho bezimela ngaphandle kwabo, sebenayo i-pentameric symmetry (izingalo ezinhlanu) futhi bahlala ngaphansi kolwandle.
Futhi uma ukhuluma nge-starfish nokuzala kwabo, mhlawumbe ungaba nentshisekelo kule enye indatshana emayelana nezilwane zasolwandle eziyivelakancane ezi-7 emhlabeni.
Yini ukukhiqizwa kabusha kwe-starfish nge-asexual?
Kukhona inganekwane esabalele yokuthi izinkanyezi zasolwandle bangenza amakhophi abo ukulahla izingxenye zezidladla zabo. Ingabe lokhu kuyiqiniso? Kusebenza kanjani ukukhiqizwa kabusha kwe-asexual starfish? Ngaphambi kokuthi sithole kufanele sikhulume nge-autotomy.
Starfish ezishintshayo
I-Starfish inamandla oku vuselela izingalo ezilahlekile. Lapho ingalo ilimele engozini, bangasondela kuyo. Benza futhi lokhu, isibonelo, lapho umhlaseli ebajaha futhi "badedela" enye yezingalo zabo ukuze bamjabulise ngenkathi bephunyuka. Ngemuva kwalokho, baqala ukwakha ingalo entsha, inqubo ebiza kakhulu engathatha izinyanga ezimbalwa.
Le ndlela iyenzeka nakwamanye amalungu ombuso wezilwane, njengezibankwa, abalahlekelwa yimisila yabo lapho bezizwa besongelwa. Lesi senzo sibizwa ngokuthi yi-autotomy futhi sivame kakhulu kwezinye izinkanyezi, njenge-starfish emangalisayo (helianthus heliaster).[5] Ngaphezu kwalokho, i-autotomy inqubo eyisisekelo yokuqonda ukuthi i-starfish ikhiqiza kanjani ngokwe-asexually.
I-Starfish nokukhiqizwa kabusha kwe-asexual
Ezinye izinhlobo ze-starfish zingakwazi ukuvuselela wonke umzimba kusuka engalweni evalekile, yize kugcinwa okungenani ingxenye yesihlanu yediski emaphakathi. Ngakho-ke, kulokhu izingalo azihlukanisiwe yi-autotomy, kepha ngenxa ye- inqubo yokuqhekeka noma yokuhlukaniswa lomzimba.
Imizimba yabo ihlukaniswe izingxenye ezinhlanu ezilinganayo. Abagcini ngokuba nemilenze emihlanu, i-disc yabo emaphakathi nayo iyi-pentamer. Lapho izimo ezidingekayo zenzeka, lokhu Ukwephuka kwediski emaphakathi noma ukuhlukana ezingxenyeni ezimbili noma ngaphezulu (kufika kwezinhlanu), ngayinye inemilenze yayo ehambisanayo. Ngale ndlela, ingxenye ngayinye ingavuselela izindawo ezingekho, yakhe yonke inkanyezi.
Ngakho-ke, abantu abasanda kwakhiwa kufana nomzali wakho, ngakho-ke, luhlobo lokukhiqizwa kabusha kwe-asexual. Lolu hlobo lokukhiqizwa kabusha kwe-starfish akwenzeki kuzo zonke izinhlobo, kepha kokuningi okufana ne- I-Aquilonastra corallicola[6].
Manje njengoba usuyazi ukuthi i-starfish izala kanjani, ungakuthola futhi kujabulisa ukwazi izinhlobo zeminenke.
Uma ufuna ukufunda izindatshana eziningi ezifana ne- Ukukhiqizwa kabusha kwe-Starfish: incazelo nezibonelo, sincoma ukuthi ufake isigaba sethu se-Curiosities somhlaba wezilwane.