El Lokacin Cambrian shine farkon wanda ya tsara zamanin Paleozoic. Ya fara ne kimanin shekaru miliyan 541 da suka gabata kuma ya kasance har zuwa shekaru miliyan 485 da suka gabata. A wannan lokacin ne duniyarmu ta sheda manyan abubuwa masu yawa da kuma rayar da rayuwar data kasance. Da Fauna na Cambrian Shi ne jarumin da ake kira "Fashewar Cambrian". Anan ne inda adadi mai yawa na nau'ikan dabbobi suka bayyana waɗanda sun riga sun kasance masu yawa da yawa kuma wannan ya fara mamaye tekuna.
A cikin wannan labarin zamu gaya muku game da duk halaye da canje-canje na fauna na Cambrian.
Lokacin Cambrian
Da farko dai, zamuyi bitar wasu daga cikin halayen halayen wannan zamanin. Yana daga ɗayan zamanin ilimin ƙasa wanda ƙwararrun masanan burbushin halittu suka yi karatun sa. Kuma shine cewa an sami canje-canje masu yawa a matakin ilimin kasa da canjin halittu masu rai. Duk wannan ya faru ne sanadiyyar canjin yanayi da ya kasance a wancan lokacin. Mun san cewa wannan lokacin ya ɗauki kimanin shekaru miliyan 56. Daga cikin manyan halaye zamu sami yaduwa da juyin halittar halittu masu cike da duniya.
Godiya ga waɗannan canje-canjen, yawancin gefunan rayayyun halittu sun fara wanzuwa waɗanda ake kiyaye su har zuwa yau. Game da ilimin ƙasa, daga cikin mahimman canje-canje akwai sauyawa da rarrabuwa daga manyan ƙasashe masu ci. Mafi yawan masana kwararru sun tabbatar da cewa akwai wasu gutsuttsura na dunƙulen ƙasa waɗanda suka kasance a zamanin Cambrian kuma cewa sakamakon rarrabuwa ce ta ma wata babbar ƙasa. Wannan super nahiyar da ake kira An raba Pannotia zuwa wasu 4 da aka sani da: Gondwana, Baltica, Laurentia da Siberia.
Saurin bugun nahiya a cikin wannan lokacin ya fi na yau yawa. Wannan ya sa gutsutsuren ya rabu da saurin gaske. Game da yanayin, akwai 'yan bayanai amma akwai wasu burbushin da aka yi nazarin halayen muhalli da su. An bayyana cewa a lokacin Cambrian yanayin zafi ya dara na sauran lokutan yanayin kasa sosai. Wannan saboda saboda da wuya akwai wasu gutsutsuren kankara a duniya. Kusan dukkanin yankin arewacin yana da Tekun Phantalassa kuma yanayin yana da yanayi mai kyau kuma na teku.
Dangane da yanayi kuma mun san cewa akwai wasu sauye-sauye na yanayi ta yadda za a bayyana cewa ba su da canje-canje kwatsam da yawa. Koyaya, wasu kwararru suna da'awar cewa a ƙarshen Cambrian ana iya lura da raguwar yanayin zafin duniya. Wannan yana haifar da wasu nahiyoyin da suke tafiya a hankali don kankara ta rufe su.
vida
Game da rayuwa a wannan lokacin shine abin da ake kira fashewar Cambrian saboda yawan bambancin da ke tattare da dukkan nau'ikan rayuwa. Kodayake rayuwa ta bayyana a zamanin Archaic, amma ba a lokacin ba har zuwa lokacin Cambrian ta sami damar iya sarrafawa tunda sauran rayuwar ta kasance mai sauki. Wannan sanannen sananne ne tunda yawancin jinsuna na iya haɓaka. Babban bambancin rayayyun halittu ya bayyana kusan lokaci guda. Godiya ga bayanan burbushin, an sami bayanai masu yawa. Dalilan fashewar Cambrian ba su iya bayyana takamaimai menene farkon abin da rayuwa ke iya jujjuya ta.
An kiyasta cewa su ne dalilai masu zuwa:
- Inara yawan iskar oxygen
- Levelsara matakan ozone a cikin sashin ozone da kariya daga radiation mai cutarwa na ultraviolet.
- Levelara matakin teku. Wannan yana nufin cewa damar samar da gidaje mafi yawan matsuguni, mahalli na muhalli kuma, sabili da haka, yawancin jinsuna na iya haɓaka.
Fauna na Cambrian
Dabbobin Cambrian sun kasance galibi cikin ruwa. Dukkanin halittu suna da fadi sosai kuma ana samun su a cikin tekuna. Mafi yawan dabbobin da suka hada dabbobi na Cambrian sun kasance masu rikitarwa. Anan zamu sami masu amfani da trilobites, wasu manyan invertebrates da sauran kungiyoyi kamar su su zubi ne, soso da tsutsotsi. Zamu binciko daya bayan daya mafi yawan jinsunan dabbobi na Cambrian:
Sponges
A wannan lokacin ya kasance gama gari don samun adadi mai yawa na sponges a kan tekun. A yau an rarraba su a kan bakin ƙofa. Babban halayyar sa shine ta samun sanduna a ko'ina cikin tsarin ta. Ta hanyar wadannan pores din suna taimakawa zagaye da tace sinadaran da ke cikin ruwa. Burbushin halittun wadannan kwayoyin sun taimaka wajen samun bayanai game da cigaban wadannan dabbobi a wancan lokacin. Godiya ga waɗannan bayanan burbushin halittu, sananne ne cewa akwai sponges masu kama da tsarin bishiyoyi da sauransu tare da siffar mazugi.
Arthropods
Su ne dabbobi da suka fi ci gaba da yawa. A yau, sun kasance mafi yawan dabbobi masu yawa a cikin mulkin dabbobi. A cikin fauna na Cambrian wannan ba banda bane. A cikin wannan rukunin, mun sami mafi wakilci a matsayin trilobites. Sun yawaita a wannan lokacin kusan kiyaye rayuwarsu har zuwa ƙarshen Lokacin Permian. Sun kasance ɗaya daga cikin dabbobin farko da suka haɓaka tunanin gani.
Fauna na Cambrian: mollusks
Mollusks sun sami babban canji iri daban-daban a cikin azuzuwan daban-daban. Wasu daga cikinsu har yanzu ana samun su. Muna da gastropods da cephalopods, da sauransu.
Echinoderms
Ya sami fadada da yawa da yawa a wannan lokacin. Sabbin nau'ikan halittu sun bayyana wadanda zasu iya daidaita da yanayin muhalli daban daban. Ajin da ya rayu mafi tsayi shine crinoid.
Fauna na Cambrian: mawaƙa
Ya kasance mafi mahimmancin rukunin dabbobi waɗanda suka samo asali a wannan lokacin. Godiya ga waɗannan dabbobin an san cewa fauna ta Cambrian ta haɓaka ƙungiyoyi da yawa kamar su gandun daji waɗanda a ciki muke da amphibians, kifi, dabbobi masu rarrafe, tsuntsaye da dabbobi masu shayarwa. Abun da ya bambanta wadannan dabbobin shine cewa suna da tsari wanda aka sani da notochord. Saboda haka sunan chordates. Notochord igiyar tubular ce wacce ta fadada gaba dayan sassan mutum kuma yana da tsarin aiki. Hakanan akwai tsarin juyayi na tsakiya, bayan wutsiya ta bayan fage, da maƙogwaron ɓarna.
Ina fatan cewa tare da wannan bayanin zaku iya ƙarin koyo game da fauna na Cambrian da halayenta.