Wadatacce
- Haihuwar Starfish
- Yaya ake haɗa kifin tauraro?
- Shin kifin tauraron yana oviparous ko viviparous?
- Menene haifuwar asexual na kifin tauraro?
- Starfish aiki da kai
- Starfish da haifuwar asexual
Kifin kifi (Asteroidea) yana daya daga cikin dabbobin da ke da ban mamaki a kusa. Tare da urchins, urchins da cucumbers na teku, suna ƙirƙirar ƙungiyar echinoderms, ƙungiyar invertebrates waɗanda ke ɓoye a saman tekun. An saba ganin su a bakin duwatsu yayin da suke tafiya a hankali. Wataƙila wannan shine dalilin da yasa yake kashe mu da yawa don yin tunani yadda ake hayayyafa naleashes.
Dangane da hanyar rayuwarsu, waɗannan dabbobin suna ninkawa ta hanya mai ban sha'awa da ban sha'awa. Suna da hayayyafa ta jima'i, kamar mu, duk da cewa su ma suna yaduwa ta hanyar jima'i, wato suna yin kwafin kansu. Kuna son sanin yadda? Don haka kar a rasa wannan labarin PeritoAnimal game da haifuwa na kifin tauraro: bayani da misalai.
Haihuwar Starfish
Haihuwar kifin kifi yana farawa lokacin da ake samun kyakkyawan yanayin muhalli. Yawancin su suna hayayyafa a lokacin zafi mafi zafi na shekara. Hakanan, mutane da yawa suna zaɓar ranakun manyan ruwa. Amma yaya game da haifuwar kifin tauraro? Naku babban nau'in haifuwa shine jima'i kuma yana farawa da neman daidaikun jinsi.
wadannan dabbobin ruwa da jinsi daban, wato akwai maza da mata, tare da wasu keɓaɓɓun hermaphrodite.[1] Bin diddigin hanyoyin hormones da sauran sunadarai[2], ana sanya kifin tauraro a wurare mafi kyau don hayayyafa. Duk nau'ikan kifin taurari suna ƙanana ko manyan ƙungiyoyi da ake kira "rabe -rabe"inda maza da mata suke haduwa. Daga wannan lokaci, kowane nau'in yana nuna dabaru iri daban -daban.
Yaya ake haɗa kifin tauraro?
Haihuwar kifin starfish yana farawa lokacin da yawancin mutane ke haɗuwa a cikin ƙungiyoyi masu yawa don fara aiwatar da rarrafe a kan juna, tabawa da haɗe hannayensu. Waɗannan lambobin sadarwa da ɓoyayyen wasu abubuwa suna haifar da sakin gametes tare ta hanyar jinsi: mata suna sakin ƙwai su kuma maza suna sakin maniyyin su.
Kwayoyin halittu suna haɗuwa cikin ruwa, suna faruwa abin da ake kira hadi na waje. Daga wannan lokacin, rayuwar kifin tauraro ta fara. Babu juna biyu: embryos suna tasowa da haɓaka cikin ruwa ko, a cikin wasu nau'ikan, akan jikin mahaifa. Ana kiran wannan nau'in haɗin pseudocopulation, kamar yadda akwai hulɗar jiki amma babu shigar azzakari.
A wasu nau'in, kamar tauraron yashi (archaster na hankula), pseudocopulation yana faruwa a ma'aurata. Daya namiji yana tsaye a saman mace, suna shiga hannunsu. Ana gani daga sama, suna kama da tauraro mai kusurwa goma. Za su iya zama a haka har tsawon yini ɗaya, ta yadda galibi ana rufe su da yashi. A ƙarshe, kamar yadda ya faru a baya, duka suna sakin gametes ɗin su kuma hadi na waje yana faruwa.[3]
A cikin wannan misalin taurarin yashi, ko da yake haɗin yana faruwa a cikin nau'i biyu, yana kuma iya faruwa a ƙungiya. Ta wannan hanyar, suna haɓaka damar sake haifuwa, tare da samun abokan hulɗa da yawa a cikin wannan lokacin haihuwa. Saboda haka, starfish ne dabbobi masu auren mata fiye da daya.
Shin kifin tauraron yana oviparous ko viviparous?
Yanzu da muka yi magana game da kifin tauraro da hayayyafarsu, za mu sake yin wata tambaya ta gama -gari game da su. Mafi na kifin tauraro yana da oviparous, wato suna yin kwai.Daga tarayyar maniyyi da ƙwai da aka saki, ana yin ƙwai mai yawa. Galibi ana ajiye su a saman teku ko, a cikin wasu 'yan tsirarun halittu, a cikin tsarin kyankyasar da iyayensu ke da su a jikinsu. Lokacin da suke ƙyanƙyashe, ba sa kama taurarin da duk muka sani, amma larvae na planktonic cewa ninkaya.
Tsutsukan kifin kifin biyu ne, wato, jikinsu ya kasu kashi biyu daidai (kamar mu mutane). Aikinsa shi ne yaɗuwa a cikin teku, ya mallaki sabbin wurare. Yayin da suke yin haka, suna ciyarwa suna girma har zuwa lokacin girma ya zama manya. Don wannan, suna nutsewa zuwa ƙarƙashin teku kuma suna wahala a tsarin metamorphosis.
A ƙarshe, kodayake yana da wuya, dole ne mu ambaci hakan wasu nau'ikan tsakanin nau'ikan kifin taurari suna da rai. Al'amarin shine patiriella vivipara, waɗanda zuriyarsu ke haɓaka cikin gonads na iyayensu.[4] Ta wannan hanyar, lokacin da suka sami 'yanci daga gare su, sun riga suna da alamar pentameric (makamai biyar) kuma suna zaune a ƙarƙashin teku.
Kuma magana game da kifin tauraro da haifuwarsu, wataƙila kuna iya sha'awar wannan labarin game da dabbobin ruwa 7 mafi ƙarancin ruwa a duniya.
Menene haifuwar asexual na kifin tauraro?
Akwai labari mai yaɗuwa cewa taurarin teku iya yin kwafin kansu faduwa sassa na yatsunsu. Shin wannan gaskiya ne? Ta yaya haɓakar kifin taurari yake aiki? Kafin mu gano yakamata muyi magana game da sarrafa kansa.
Starfish aiki da kai
Starfish yana da ikon farfado da ɓatattun makamai. Lokacin da hannu ya lalace a hatsari, za su iya rabuwa da shi. Hakanan suna yin wannan, alal misali, lokacin da mai farauta ya bi su kuma suka “saki” ɗaya daga cikin hannayensu don nishadantar da shi yayin da suke tserewa. Bayan haka, sun fara ƙirƙirar sabon hannun, tsari mai tsada sosai wanda zai iya ɗaukar watanni da yawa.
Hakanan wannan tsarin yana faruwa a cikin sauran membobin mulkin dabbobi, kamar kadangare, waɗanda ke rasa wutsiyarsu lokacin da suke jin barazanar. Wannan aikin ana kiranta autotomy kuma ya zama ruwan dare a cikin wasu kifin tauraro, kamar kifin kifin mai ban mamaki (helianthus heliaster).[5] Bugu da ƙari, tsarin sarrafa kansa hanya ce mai mahimmanci don fahimtar yadda kifin tauraro ke haifar da jinsi.
Starfish da haifuwar asexual
Wasu nau'in kifin tauraro na iya sake farfado da jiki gaba daya daga hannun da aka ware, kodayake ana kiyaye akalla kashi biyar na tsakiyar faifai. Don haka, a wannan yanayin ba a ware makamai ta atomatik, amma saboda a tsarin fission ko rarrabuwa na jiki.
Starfish an raba jikinsu zuwa kashi biyar daidai. Ba wai kawai suna da kafafu biyar ba, diski na tsakiya su ma pentamer ne. Lokacin da yanayin da ake buƙata ya faru, wannan diski na tsakiya ya karye ko ya tsage a sassa biyu ko fiye (har zuwa biyar), kowanne da ƙafafunsa masu dacewa. Ta wannan hanyar, kowane sashi na iya sake farfado da wuraren da suka ɓace, yana ƙirƙirar tauraro gaba ɗaya.
Saboda haka, sabbin mutanen da aka kafa sune m ga mahaifanka, sabili da haka, shi ne nau'in haɓakar asexual. Wannan nau'in haɓakar kifin ba ya faruwa a cikin kowane nau'in, amma a yawancin irin su Aquilonastra corallicola[6].
Yanzu da kuka san yadda kifin kifin ke hayayyafa, kuna iya samun abin sha'awa don sanin nau'ikan katantanwa.
Idan kuna son karanta ƙarin labarai makamantansu Haihuwar Starfish: bayani da misalai,, muna ba da shawarar cewa ku shiga ɓangaren Curiosities na duniyar dabbobi.