Kogin stingray (Potamotrygon motoro) wani nau'i ne na stingrays daga tsarin stingray.
Rarraba mai kogin
Rashin kogin yana da yawa ga tsarin kogin Kudancin Amurka da yawa. Isan asalin ƙasar Brazil ne a cikin yankin Amazon, kuma kodayake an tabbatar da kasancewar sa a cikin koguna a Kudancin Amurka, har yanzu ba a fahimci cikakken bayanin yadda aka rarraba shi a wajen Amazon ɗin na Brazil ba. Hakanan ana samun wannan ɓarnar a cikin Uruguay, Parana, a cikin kogunan da ke tsakanin Paraguay da Orinoco, gami da a tsakiyar da ƙananan ɓangaren Rio Parana a yammacin Brazil (inda ya fi yawan nau'ikan), tsakiyar Rio Riouay, Rio Bermejo, Rio -Guugal, Rio Negro, Rio Branco, Rio de Janeiro da Rio Paraguay.
Wannan jinsin ya bazu a yanzun nan zuwa wasu manya-manya na Tekun Amazon da sauran wurare masu nisa saboda gina madatsar ruwa, wanda ya cire shingen dabi'a na ƙaura.
Kogin matsuguni
Ana samun sandunan kogi a cikin kogunan ruwa mai zafi tare da yanayin zafi (24 ° C-26 ° C). Zurfin mazaunin ya dogara da zurfin kogin da kifi ya zauna a ciki. Nazarin ya nuna cewa ana samun wadannan haskoki a zurfin mita 0.5-2.5 a saman sama na Kogin Parana, a zurfin mita 7-10 a Kogin Uruguay. Masu kogin kogi sun fi son ruwan sanyi tare da sandry mai yashi, musamman a gefen rafuka da tafkuna, inda galibi suke ɓoyewa.
Alamomin waje na kogin stingray
Kogin stingrays ya banbanta da nau'ikan da ke da alaƙa ta hanyar kasancewar lemu ko idanun rawaya a gefen gefen ƙofa, kowannensu yana kewaye da bakin zobe, tare da diamita mafi girma daga wannan wurin.
Jiki yana da launin toka-launin ruwan kasa. Jiki yana oval tare da wutsiya mai ƙarfi. Matsakaicin matsakaici ya kai 100 cm kuma mafi girman nauyi shine kilogiram 15, kodayake, masu saƙo sun fi ƙanƙanta (50-60 cm kuma suna auna zuwa kilogram 10). Mata sun fi maza girma.
Sake bugun mashin kogin
Lokutan kiwo suna dogaro ne da tsarin rafin ruwa a cikin rafuka kuma suna iyakance zuwa lokacin rani, wanda ya fara daga Yuni zuwa Nuwamba. Yin jima'i a cikin kogin stingrays an lura dashi ne kawai a cikin yawan aviary, sabili da haka, za'a iya samun bambance-bambance daga kiwo na yawan daji. Dabino yana faruwa galibi da dare. Namiji ya kama mace kuma ya riƙe maƙogwaronsa a gefen bayan faifinta, wani lokacin yana barin alamun cizon da ke sananne.
Zai yiwu maza su sadu da mata da yawa a tsakanin makonnin da yawa. Kogin stingrays nau'ikan ovoviviparous ne, ƙwaiyensu suna 30 mm a diamita.
Mace tana ɗaukar offspringa offspringa na tsawon watanni 6, samari masu ban tsoro suna bayyana yayin damina daga Disamba zuwa Maris (zuriya suna fitowa a cikin akwatin kifaye bayan watanni 3). Lambar su daga 3 zuwa 21 kuma ba ta da kyau.
Yawanci, ana kyankyashe rubter guda ɗaya kowace shekara har tsawon shekaru uku a jere, sannan shekaru da yawa na rashin aiki na haihuwa. Amfrayo a cikin jikin mata na karbar abinci daga mahaifiya.
Ananan mata mata suna haihuwar cuban ƙabilu. Yawancin lokaci a cikin brood 55% maza da 45% mata. Tsawon matasa stingrays shine 96.8 mm akan matsakaici. Matasa matasa masu farauta nan da nan suka zama masu cin gashin kansu, suna ninka idan sun kai shekaru 20 zuwa shekaru 7.5.
Ba a san bayani game da rayuwar rayuwar kogin daji a cikin daji ba. Waɗannan kifin da ke cikin bauta suna rayuwa har zuwa shekaru 15.
Halin halin kogi
Masu kogin kogi suna ƙaura zuwa kogunan ruwa da rafuka. Nisan, wanda kogin ya yi ƙaura da shi, ya kai kilomita 100. Kifi yana rayuwa shi kaɗai, ban da lokacin ɓatancin. Da rana za ka iya ganin stingrays binne a cikin yashi adibas. Ba'a sani ba ko waɗannan haskoki sune ƙananan yankuna.
Haskoki na kogi suna da idanu waɗanda ke kan ƙarshen gefen kai wanda ke ba da kusan filin 360 ° na gani. Girman dalibi ya bambanta da yanayin haske. Layin layi tare da ƙwayoyin halitta na musamman suna tsinkayar canjin matsa lamba cikin ruwa. Hakanan masu shinge kogin suna da hadadden rukunin masu karɓar lantarki wanda ke ba da izini mai saurin saurin tasirin lantarki don gano ganimar da ba za a iya gani a cikin ruwa ba.
Hakanan, waɗannan kifin suna gano masu farauta kuma suna kewayen yanayin ruwa. Gabobin kamshi suna cikin kwanten jikin cartilaginous a saman kai. Caimans da manyan kifaye suna farautar kogin stingrays Koyaya, daɗaɗɗen, dafin ƙashin baya a kan jela muhimmin tsaro ne daga masu farauta.
Kogin ciyar da kogi
Abincin abinci na kogin stingrays ya dogara da shekarun haskoki da kasancewar ganima a cikin muhalli. Ba da daɗewa ba bayan haihuwa, samari 'yan stingrays suna cin plankton da yara, suna cin ƙananan molluscs, crustaceans, da ƙwayoyin kwari na cikin ruwa.
Manya suna cin abinci akan kifi (astianax, bonito), da crustaceans, gastropods, da kwari na cikin ruwa.
Ma'ana ga mutum
Kogin kogi yana da dafi mai dafi wanda ke barin raunuka masu zafi a jikin mutum. A cikin 'yan shekarun nan, an sami lokuta da yawa na rauni ga mutane a yankin da Kogin Parana ya gudana a cikin rahoton lamarin. Abubuwan farautar kogi abun farauta ne; mazauna karkara suna kamawa kuma suna cin stingrays.
Matsayin kiyayewa na mashin kogin
IUCN ta ayyana kogin stingray a matsayin nau'in "karancin bayanai". Adadin mutane kwata-kwata ba a san su ba, hanyar rayuwa ta ɓoye da rayuwa cikin ruwa mai laka yana da wahalar nazarin yanayin halittar waɗannan kifin. A cikin yankuna da yawa da ke da kwarin kogin da ke rayuwa, babu takunkumi kan fitar da hasken ruwa. A cikin Uruguay, ana shirya kamun kifin wasanni don kwarin kogin. Relativelyananan buƙatun da ake buƙata na wannan nau'in kifin a matsayin tushen abinci yana ba da gudummawa ga raguwar ƙarancin hasken kogi a cikin yanayi.
