Duck ɗin zane (wanda ɗan Amurka ne mai jan kai, Latin - Aythya americana) na dangin duck ne, umarnin Anseriformes.
Canvas nutse yada.
Ana samun agwagin jirgin ne a filayen tsakiyar Arewacin Amurka, gami da Amurka daga Colorado da Nevada, Northern British Columbia, Alberta, Saskatchewan, Manitoba, Yukon, da Central Alaska. A cikin 'yan shekarun nan, ya bazu zuwa arewa. Winarfafawa yana faruwa a yankin daga gabar Tekun Pacific Northwest, a kudancin Manyan Tabkuna da kuma kudu zuwa Florida, Mexico da California. Ididdigar hunturu mafi girma tana faruwa a Lake St. Clair, da Detroit River da gabashin Lake Erie, Puget Sound, San Francisco Bay, Mississippi Delta, Chesapeake Bay, da Carrituck.
Ji muryar zane-zane.
Mazaunin zane-zane yana nutsewa.
A lokacin kiwo, ana samun nutse-zane a wuraren da ke da ƙananan ruwa, inda halin yanzu ke tafiyar hawainiya. Sun yi gida-gida a wuraren da ke da kananan tabkuna da kududdufai, a fadama mai dauke da ciyayi masu tsiro kamar cattail, reeds, da reeds. A lokacin ƙaura da kuma lokacin sanyi, suna zaune a wuraren ruwa tare da wadataccen abinci, a cikin kogin ruwa, manyan tafkuna, rairayin bakin teku da rairayin bakin teku, da kuma delta na manyan koguna. A kan hanya, suna tsayawa a filayen da ruwa ya cika da ruwa.
Alamomin waje na zane-zane.
Canzantar da ruwa na ainihi "aristocrats" a tsakanin agwagwa, sun sami irin wannan ma'anar don kyawun yanayinsu. Waɗannan sune manyan agwagwan ruwa. Maza sun fi mata girma kaɗan, daga tsawon 51 zuwa 56 cm. Suna da nauyin 863 zuwa 1.589 g Mata masu tsayin jiki daga 48 zuwa 52 cm kuma nauyi daga 908 zuwa 1.543 g.
Ruwan canvas ya banbanta da sauran nau'ikan agwagi ba wai a cikin girman su kaɗai ba, har ma da halayyar su ta dogon lokaci, ba ta da zurfin ciki, kai mai fasali, wanda ke tsaye kai tsaye a kan dogon wuya. Maza a cikin kiwo irin na kiwo, wanda ba sa canzawa a mafi yawan shekara, suna da kai da wuya a launin ruwan kasa-ja-ja. Kirjin baƙi ne, fari fuka-fuki, gefuna da ciki. Fusoshi na sama da gashin jela baƙi ne. Kafafuwan suna da launin toka-toka kuma bakaken baƙi ne. Mata suna da launi iri-iri, amma suna kama da na maza. Kai da wuya suna da launin ruwan kasa. Fukafukai, fans, da ciki fari ne ko launin toka, yayin da jela da kirji launin ruwan kasa ne masu duhu. Matasan zane-zanen ruwa suna da launin ruwan kasa mai ruwan kasa.
Sake bugun zane-zane.
Ruwan ruwa yana yin nau'i-nau'i a lokacin ƙaura ta bazara kuma yawanci yakan kasance tare da abokin aure a lokacin bazara, kodayake wani lokacin maza suna yin aure da wasu mata. A tsakiyar saduwa, mace tana kewaye da maza 3 zuwa 8. Suna jan hankalin mace, suna shimfida wuyansu sama, suna jefa kawunansu a gaba, sannan suna juya kansu baya.
Mace tana zaɓar irin gidajen da ake yin sheƙar a kowace shekara. Yankunan nest suna ƙaddara a ƙarshen Afrilu, amma ƙwanƙolin nesting yana cikin Mayu - Yuni. Wasu tsuntsaye biyu suna da tsintsiya madaurinki daya a shekara, kodayake agwagwa na sake hayayyafa idan an lalata zuriya ta farko. Gidajen gandun daji an gina su ne a cikin ciyayi masu tasowa sama da ruwa, kodayake wani lokacin sukan gina gida gida a gefen ruwan. Mata na kwance 5 zuwa 11 mai santsi, ƙyalli, ƙwai mai launin toka-kore.
A cikin kama, gwargwadon yankin, akwai ƙwai 6 zuwa 8 a kowane gida, amma wani lokacin ƙari saboda lalatacciyar gurbi. Shiryawa yana ɗaukar kwanaki 24 - 29. Matasa iri-iri suna iya iyo kuma su sami abinci yanzunnan. Lokacin da mace ta lura da wani mai farauta kusa da gidan, sai ta yi nutsuwa a hankali don karkatar da hankali. Duck din ya gargadi samari da yara da murya don su sami lokacin buya a cikin ciyayi mai yawa. Wajen lokacin kiwo, tsuntsayen suna kafa manyan kungiyoyi, wanda ke taimaka wajan kaucewa afkawa daga maharan. Amma har yanzu, har zuwa kashi 60% na kajin suna mutuwa.
Kaji suna fantsama suna da shekaru 56 zuwa 68.
Mata na yin gida gida daga shuke-shuke da fuka-fukai. Maza maza suna kiyaye yankin nest na su da nests, musamman ma a makon farko bayan farawar jijiyoyin. Sannan suna bata lokaci kaɗan kusa da gida. Mata suna barin gida tare da tsintsa cikin awanni 24 bayan bayyanar kajin kuma suna komawa manyan ruwaye masu ciyayi masu yawa.
Suna zama tare da agwagwa har zuwa ƙaura kuma suna kare su daga maharan. Ruwan zane-zane yana rayuwa a cikin mazauninsu na tsawan shekaru 22 da watanni 7. A ƙarshen watan Agusta ko farkon Satumba, agwagin samari sun kafa ƙungiyoyi don shirya don ƙaura. Sun kiwo shekara mai zuwa.
Adadin rayuwar shekara-shekara na balagaggun ruwa an kiyasta shi zuwa 82% na maza kuma 69% na mata. Mafi yawanci, ana kashe agwagi ta hanyar farauta, haɗuwa, guba mai guba da lokacin sanyi.
Fasali na halayyar zane-zane.
Nutsar ruwa na Canvas suna aiki da rana. Tsuntsaye ne na jama'a kuma suna yin ƙaura bayan lokaci bayan kiwo. Suna tashi cikin garken garken-V kyauta mai saurin gudu zuwa 90 km / h. Kafin su tashi, sai suka watsa akan ruwan. Waɗannan agwagwan suna da ƙwarewa da ƙarfi masu iyo, tare da ƙafafunsu suna bayan jikin. Sun shafe kusan 20% na lokacinsu akan ruwa kuma suka nitse zuwa zurfin sama da mita 9. Sun tsaya a karkashin ruwa na dakika 10 zuwa 20. Yankunan kiwo suna canzawa yayin girman kiwo. Yankin gurbin ya kai hekta 73 kafin gurbi, sannan ya karu zuwa hekta 150 kafin kwanciya, sannan kuma ya ragu zuwa hekta 25 lokacin da tuni an fara kwai.
Canvas nutsar da abinci.
Ruwan canvas tsuntsaye ne masu komai. A lokacin hunturu da ƙaura, suna ciyar da ciyayi na cikin ruwa gami da ƙwayaye, tushe, tubers da rhizomes. Suna cin ƙananan gastropods da bivalve molluscs yayin. A lokacin kiwo, suna cinye katantanwa, tsutsar tsakar gida da nymphs na mazari da mayflies, sauro sauro - kararrawa. A wajen lokacin kiwo, zane-zane yana nutsewa a garken tumaki har zuwa tsuntsaye 1000 galibi safe da yamma. Wadannan agwagwan ruwa suna kamo abinci lokacin da suke shiga ruwa ko kama ganima daga saman ruwa ko iska.
Matsayin kiyayewa na zane-zane.
Ana kiyaye nutsewar kanvas, kamar yadda aka kiyaye shi azaman jinsin ƙaura a cikin Amurka, Mexico da Kanada. Wannan nau'in ba ya fuskantar barazanar mai karfi ga lambobinsa. Koyaya, adadin tsuntsayen yana raguwa sakamakon harbi, lalacewar muhalli, gurbatar muhalli da haɗuwa da motoci ko abubuwan da suke tsaye.
Farautar kaka tana da tasiri mai ƙarfi musamman yayin ƙaurawar tsuntsaye. A shekarar 1999, an kiyasta kashe 87,000 a Amurka. Hakanan kwale-kwalen dusar kankara yana da saukin kamuwa da gubobi waɗanda suke tarawa a cikin laula. Wannan gaskiya ne a yankunan da ke da manyan ayyukan masana'antu kamar Kogin Detroit. Astananan Damuwa da IUCN.
