Duck Hawaiian

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Duck na Hawaiian (A. wyvilliana) na dangin duck ne, umarnin Anseriformes.

Alamomin waje na agwagin Hawaii

Duck na Hawaiian ƙaramin tsuntsu ne, wanda ya fi na mallard gama gari. Namiji yana da matsakaiciyar tsawon jiki na 48-50 cm, mace tana da ɗan ƙarami - 40-43 cm A matsakaita, drake tana da nauyin gram 604, mace kuma gram 460. Lumbin launin ruwan kasa mai duhu tare da launuka iri-iri kuma yayi kama da fuka-fukai na agwagwa ta kowa.

Maza suna da nau'i biyu:

  • Tare da lissafin koren-zaitun mai alamar duhu, zaninsu yana da haske tare da sanye da koren mashi a rawanin da baya na kai da kuma jan launi a kirjin.
  • Nau'in na biyu na maza suna da kodadde kodadde kamar na mata masu ɗigon ruwan kasa, sautin jan a kirji. Bakunansu mai duhu ne tare da alamar rawaya-launin ruwan kasa ko alamar lemu. Fukafukan suna haske tare da "madubi" na Emerald kore ko purple-blue color.

Dangane da waɗannan halaye, agwagin Hawaii ya banbanta da mallard (A. platyrhynchos), wanda ke da yankuna baki da fari akan gashin gashin wutsiyar waje, kuma "madubi" shudin-shuɗi ne. Legsafafu da ƙafafun duck na Hawaiian ruwan lemo ne ko ruwan dorawa-ruwan lemo. Babban mutum yana da duhu kai da wuya wanda wani lokacin yakan zama kore. Fitilar mace yawanci ta fi ta drake sauƙi kuma a bayan baya akwai gashin fuka mafi sauƙi.

Bambance-bambancen yanayi a jikin labu, sauye-sauye daban-daban a launin launuka a cikin agwagin Hawaiian na wahalar da jinsin. Bugu da ƙari, babban haɗuwa tare da mallards a cikin mazauninsu yana da wuya a gano agwagin Hawaiian.

Hawainiya duck abinci

Ducks na Hawaii tsuntsaye ne masu cin komai. Abincin su ya ƙunshi tsire-tsire: tsaba, koren algae. Tsuntsaye suna cin ganyayyaki, da kwari, da sauran dabbobin da ke cikin ruwa. Suna cin katantanwa, tsutsayen kwari, tsutsar ciki, tadpoles, kifin kifa, tsutsa sauro.

Fasali na halayyar agwagwan Hawaiian

Ducks na Hawaii suna rayuwa biyu-biyu ko kafa ƙungiyoyi da yawa. Wadannan tsuntsayen suna da taka tsantsan kuma suna ɓoye a cikin doguwar fadama mai dausayi a kusa da dutsen mai aman wuta na Kohala a babban tsibirin Hoei '. Sauran nau'ikan agwagwa ba a tuntubarsu a keɓe su.

Hawan duck Hawaiian

Ducks na Hawaiian sun yi kiwo a tsawon shekara. A lokacin lokacin saduwa, ma'auratan agwagwa suna nuna tashin hankali na bikin aure. Clutch ya ƙunshi daga ƙwai 2 zuwa 10. Gida na buya a kebantaccen wuri. Fuka-fukai da aka zaro daga kirjin agwagwa suna zama a rufi. Shiryawa yana ɗaukar kusan wata ɗaya a tsayi. Ba da daɗewa ba bayan ƙyanƙyashe, ɗan akuya ya yi iyo a cikin ruwa, amma ba ya tashi har sun cika makonni tara. Birdsananan tsuntsaye suna haihuwa bayan shekara guda.

Matan agwagwa na Hawahi suna da ƙaunatacciyar ƙaunata ga mallar daji.

Ba a san abin da ke jagorantar tsuntsayen wajen zaɓar abokin aure ba, wataƙila suna da sha'awar wasu launuka a cikin launi na plumage. A kowane hali, waɗannan nau'ikan agwagin biyun suna haɗuwa koyaushe kuma suna haifar da offspringa offspringan brida .an. Amma wannan tsallake tsallaka tsallaka ɗaya ne daga cikin dalilan da ke haifar da barazana ga agwagin Hawaii.

Hybrid A. platyrhynchos × A. wyvilliana na iya samun haɗuwa da halayen iyaye, amma gabaɗaya ya bambanta da agwagin Hawaiian.

Duck Hawaiian yada

A wani lokaci, Ducks na Hawaii suna zaune a cikin dukkan manyan Tsibirin Hawaii (Amurka), ban da Lana da Kahoolave, amma yanzu mazaunin yana iyakance ga Kauai da Ni'ihau, kuma ya bayyana a Oahu da babban tsibirin Maui. An kiyasta yawan mutanen a 2200 - 2525 mutane.

Kimanin tsuntsaye 300 ne suka hango a kan Oahu da Maui, wadanda suka yi kama da A. wyvilliana a sifofi, amma wannan bayanan yana buƙatar bincike na musamman, tunda yawancin tsuntsayen da ke zaune a waɗannan tsibirai guda biyu sun haɗu ne na A. wyvilliana. Ba za a iya tantance rabewa da yalwar agwagin Hawaii ba, saboda a wasu yankuna na kewayon, tsuntsaye na da wahalar ganowa saboda haɗuwa da wani nau'in agwagin.

Mazaunin duck Hawaiian

Duck na Hawaii yana zaune a cikin dausayi.

Hakan na faruwa a tafkunan gabar ruwa, fadama, tabkuna, makiyaya masu ambaliyar ruwa. Yana sauka a cikin koramu na tsaunuka, wuraren ajiyar ruwa na dan adam kuma wani lokacin a cikin dazuzzukan dausayi. Ya hau zuwa tsayin mita 3300. Ya fi son dausayi fiye da kadada 0.23, wanda bai fi kusa da mita 600 daga ƙauyukan mutane ba.

Dalilai na raguwar yawan agwagwar Hawaii

Babban raguwar yawan agwagin Hawaii a farkon karni na 20 ya samo asali ne daga haifuwar dabbobi masu cin nama: beraye, mongoes, karnukan gida da kuliyoyi. Rasa muhalli, ci gaban aikin gona da birane, da kuma farauta ba tare da nuna bambanci ba game da tsuntsayen ruwa masu ƙaura sun haifar da mutuwar adadi mai yawa, ciki har da raguwar adadin agwagwan Hawaii.

A halin yanzu, haɗuwa tare da A. platyrhynchos shine babban barazanar dawo da jinsin.

Raguwar dausayi da canjin mazauni ta hanyar baƙon tsire-tsire masu ruwa yana barazanar kasancewar agwagwan Hawaiian. Aladu, awaki da sauran dabbobin daji suna tarwatsa gidan tsuntsaye. Har ila yau ana fuskantar barazanar agwagwan Hawaii na fari da damuwa na yawon shakatawa.

Ayyukan tsaro

An kare agwagin Hawaii a Kauai, a cikin Hanalei - ajiyar ƙasa. An saki agwagin wannan nau'in, wanda aka haife shi a cikin kamuwa, a kan Oahu a cikin adadin mutane 326, wasu ƙarin agwagwa 12 sun zo Maui. An kuma dawo da jinsin a kan babban tsibirin ta hanyar sakin agwagin da aka yi kiwo a cikin gidajen kaji.

A ƙarshen 1980, jihar ta hana shigo da A. platyrhynchos, ban da amfani a binciken kimiyya da nune-nunen. A shekarar 2002, Ma'aikatar Aikin Gona ta sanya takunkumi a kan dukkan nau'ikan tsuntsayen da aka kawo su Tsibirin Hawaiian don kare tsuntsaye daga kwayar Yammacin Nilu. Ana kan ci gaba da bincike don kirkiro hanyoyin gano matasan da suka hada da gwajin kwayoyin halitta.

Ayyukan kiyayewa ga agwagin Hawaiian an yi niyya ne don tantance kewayon, halayya da yalwar A. wyvilliana, A. platyrhynchos da kuma matasan, da kuma kimanta girman haɓakar keɓaɓɓu. Matakan kiyaye muhalli na nufin dawo da dausayi wanda Hawainiya ke zaune. Adadin masu farauta ya kamata a sarrafa su inda zai yiwu. Hana shigowa da watsawar A. platyrhynchos da nau'ikan da ke da alaƙa da juna.

Kare matsuguni daga gabatarwar shuke-shuke mai cutarwa zuwa cikin dausayi masu kariya. Don sanar da masu mallakar ƙasa da masu amfani da ƙasa shirin ilimi na muhalli. Matsar da agwagwan Hawaii zuwa Maui da Molokai da kuma tantance tasirin kiwon tsuntsaye a sabbin wurare.

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Kalli bidiyon: Surfing Accident Hawaii (Nuwamba 2024).