Kogin dolphins wasu ɓangare ne na dangin haƙora. Iyalan dabbobin dolphins ya ƙunshi Amazonian, China, Ganges da dolphins na kogin Lapland. Abin baƙin ciki ga kowa da kowa, dolphins na kogin China ba za a iya samun ceto ba: a shekarar 2012, an sanya wa dabbobin matsayin "dadaddun".
Masana ilimin halittu sun yi amannar cewa dalilin halakarsu ya ta'allaka ne da farautar dabbobi, fitar da abubuwa masu guba cikin magudanan ruwa, da kuma rugujewar yanayin halittu (gina madatsun ruwa, madatsun ruwa). Dabbobi ba za su iya rayuwa a cikin yanayin wucin gadi ba, saboda haka, kimiyya ba ta san yawancin nuances na rayuwarsu ba.
Bayani da siffofin kogin kifin
Kogin dolphin na Amazon mai rikodin gaske tsakanin membobin gidan kogin dolphin: nauyin jikin mazaunan kogin daga 98.5 zuwa 207 kilogiram, kuma matsakaicin tsayin jiki kusan 2.5 m.
Hoton kogin dolphin ne na kogin Amazon
Saboda gaskiyar cewa ana iya fentin dabbobi cikin haske da duhun inuwar launin toka, na sama ko ma ruwan hoda, ana kuma kiran su farin kogin dolphins kuma ruwan hoda kogin dolphins.
Inuwar ɓangaren ƙananan (ciki) launuka da yawa sun fi launi launi na jiki. Hancin yana da tsayi kadan an lanƙwasa zuwa ƙasa, yayi kama da bakin ƙamshi a cikin sura, goshin yana zagaye kuma mai tudu. A bakin baki akwai gashi tare da tsayayyen tsari, waɗanda aka tsara don yin aikin taɓawa. Idanun launuka ne masu launin rawaya, kuma yawansu bai wuce 1.3 cm ba.
Akwai hakora 104-132 a cikin ramin baka: wadanda suke a gaba suna da kwalliya kuma an shirya su ne don kwace ganima, na baya suna da wadatar yin aikin taunawa.
Fren din da ke bayan kogin dolphin na kogin Amazon ya maye gurbin dutsen, wanda tsayinsa ya fara daga 30 zuwa 61 cm Fikayen suna da girma da fadi. Dabbobi suna da damar yin tsalle sama da mita 1 a tsayi.
Dabbar dolphin ta Gangetic (susuk) launi ce mai launin toka mai duhu, sannu a hankali ta zama launin toka a kan ramin ciki. Tsawon - 2-2.6 m, nauyi - 70-90 kg. Nau'in fin din bai bambanta sosai da fincin dabbar dolphins na Amazon ba.
Hancin yana da tsawo, kimanin adadin hakora 29-33 ne. Inyananan idanu basa iya gani kuma suna da aikin taɓawa. An lissafa kifayen dolphin na kasar Ghana a matsayin jinsin dake cikin hatsari a cikin Littafin Bayanai na Red bayanai saboda yawansu kadan ne.
A cikin hoton, ƙungiyar kogin dolphin
Tsawon dolphins na Laplatian shine 1.2 -1.75 m, nauyi shine 25-61 kg. Bakin bakin yana kusan kashi daya bisa shida na tsawon jiki. Yawan hakora guda 210-240 ne. Bambancin wannan nau'in ya ta'allaka ne da launinsa, wanda ke da launi mai ruwan kasa, haka kuma gashin da suka fado yayin da suke tsufa halayyar waɗannan dolphins ne. Fins kama da triangles a cikin bayyanar. Tsawon fin ɗin da ke kan baya 7-10 cm.
Kogin dolphins suna da ƙarancin gani, amma, duk da wannan, suna da madaidaiciyar ma'ana a cikin tafki saboda ƙwarewar ji da ƙwarewar maganarsu. A cikin mazauna kogin, kasusuwan mahaifa ba su da alaƙa da juna, wanda ke ba su damar juya kawunansu a kusurwar dama zuwa jiki. Dolphins na iya zuwa saurin zuwa 18 km / h, a ƙarƙashin yanayi na al'ada suna iyo cikin saurin 3-4 km / h.
Lokacin zama a ƙarƙashin rukunin ruwa ya fara ne daga 20 zuwa 180 s. Daga cikin sautukan da aka fitar, mutum na iya rarrabe dannawa, yin kuwwa a cikin manyan sautuka, haushi, da kuwwa. Dolphins suna amfani da sauti don sadarwa tare da masu haɗuwa, da kuma yin echolocation.
Saurari muryar kogin kifin
Yanayin rayuwar dabbar dolphin da mazauninsu
Da rana kogin dolphins suna aiki, kuma da farkon dare sukan tafi hutawa a yankunan tafkin, inda saurin halin yanzu ya yi ƙasa da na wuraren da suke tsayawa da rana.
Ina dolphins na kogi ke rayuwa?? Yankin na Amazoniyan kogin dolphins su ne manyan kogunan Kudancin Amurka (Amazon, Orinoco), da kuma raginsu. Hakanan ana samun su a cikin tabkuna da wurare kusa da magudanan ruwa (sama ko ƙasa kogin).
A lokacin doguwar fari, lokacin da matakin ruwa a cikin magudanan ruwa suka sauka ƙwarai, dabbobin dolphin suna rayuwa a cikin manyan koguna, amma idan akwai wadataccen ruwa daga lokacin damina, zaka iya samun yawancinsu a cikin matsatattun hanyoyi, ko kuma a tsakiyar dazuziyar ruwa ko fili.
Kifayen dolphin na Ghana sun bazu a cikin manyan kogunan Indiya (Ganges, Hunli, Brahmaputra), haka kuma a cikin kogunan Pakistan, Nepal, Bangladesh. Da rana, yakan nitse zuwa zurfin mita 3, kuma a ɓoye da dare yana zuwa zurfin zurfin zurfin neman ganima.
Ana iya samun dolphins na Laplat a cikin koguna da tekuna. Suna zaune kusa da gabar gabashin Kudancin Amurka, bakin La Lata. Ainihin, dolphins na kogin suna rayuwa biyu-biyu ko kuma a ƙananan garken tumaki, waɗanda ba su wuce mutum ɗaya da rabi ba. Idan ana samun wadataccen abinci, dabbobin dolphin na iya ƙirƙirar garken tumaki sau da yawa.
Kogin dolphin yana ciyarwa
Suna ciyar da kifi, tsutsotsi da molluscs (kagu, shrimps, squid). Kogunan da kifayen dolphin suke zaune suna da laka; dabbobi suna amfani da tsawa don neman abinci.
Farin kogin dolphins na kama kifi da hanci, kuma suna amfani da shi azaman kayan aiki don kama kifin kifin daga ƙasan tafkin. Don ganima, suna zuwa sassan kogin da zurfin zurfin ƙasa.
Sun fi son farauta su kadai ko a kananan kungiyoyi. Dolphins na ɗaukar kifin da haƙoran gaban su, sa'annan su matsar da shi ta baya, wanda ke nika kai da farko kuma bayan dabbar ta haɗiye shi, sai a murkushe sauran. An yage manyan ganima, an fara cizon kai.
Sake haifuwa da tsawon rayuwar kogin dolphins
Balaga a ciki kogin dolphins yana faruwa a kusan shekaru 5. Ciki yakai wata 11. Bayan an haifi jaririn, nan take mace zata tura shi daga cikin ruwan don ya fara daukar numfashi.
Tsawan jikin kuzarin ya kasance cm 75-85, nauyi ya kai kimanin kilogiram 7, jiki yana da launi launin toka mai haske. Ba da daɗewa ba bayan bayyanar 'ya'ya, maza suna komawa cikin rafuka, yayin da mata da zuriyarsu suka kasance a wurin (a cikin tashoshi ko kwaruruka waɗanda ambaliyar ta tashi bayan matakin ruwa ya tashi).
Hoton jaririn dolphin ne
Bada fifiko ga irin waɗannan wuraren, matan suna kiyaye zuriya daga rashin abinci, masu farauta, har ila yau daga mummunan aiki daga ɓangaren maza baƙi. Zuriya suna kasancewa kusa da uwa har zuwa kusan shekaru 3.
Baƙon abu ne ga mace ta sake yin ciki ba tare da ta kammala aikin lactation ba. Hutu tsakanin ma'abota zai iya kasancewa daga watanni 5 zuwa 25. Kai tsaye kogin dolphins bai fi shekaru 16 - 24 ba.
