Umdwebo we-Laysan (i-Anas laysanensis) ungowomndeni wedada, i-oda le-Anseriformes.
Izimpawu zangaphandle zetial yeLaysan.
I-Laysan teal inosayizi womzimba ongu-40 - 41 cm.Leli dada elincane linesisindo esingu-447 gram. Ukwehluka komuntu ngamunye kowesilisa nowesifazane kuncane. Indoda inonqenqema olunsundu oluluhlaza okotshani, indawo emnyama ezansi. Uqhwaku lwensikazi lunombala onsundu ophuzi, owolintshi onombala ophaphathekile ezinhlangothini.
Izimpaphe zetiye yaseLaysan zibomvu ngokunsundu futhi zinomaka osobala onsundu ngokusobala. Ikhanda nentamo kumnyama bhuqe ngamachashaza amhlophe ashintshanayo. Eduze kwesisekelo somlomo naseduze kwamehlo, ukukhanya okukhonjiswe ngokungajwayelekile kuyabonakala, kwesinye isikhathi okunwebela esilevini. Ezinhlangothini zekhanda kunezindawo ezinemibala engalingani emhlophe. Indoda inezimpaphe zesibili ezinemigqa eluhlaza noma eluhlaza okwesibhakabhaka, emnyama emaphethelweni. Izimpaphe ezinkulu zekhava ezinomngcele omhlophe. Izinsikazi ezindala nezinsizwa zihlukaniswa izimpaphe ezinsundu ezimnyama noma ezimpunga ezimnyama kanye nezindwangu ezimhlophe.
Insikazi engezansi inombala onsundu kakhulu kunowesilisa, ngoba imiphetho ensundu ezimpapheni ibanzi. Amaduna amancane anezimpaphe zomsila ezimaphakathi nezisontekile. Imilenze nezinyawo kuwolintshi. Iris yeso insundu.
Lalela izwi le-teal Laysan.
Izindawo zokuhlala ze-Laysan teal.
Ama-teys ama-Laysan ahluke kakhulu ezinyonini zezwekazi ngezindinganiso zawo, kepha ziyefana ngezindlela eziningi nezinye izinyoni ezihlala eziqhingini. Zitholakala kokubili emanzini nasenhlabathini, zisebenzisa yonke indawo ekhona eLaysan Island. Lolu hlobo luhlala ezindundumeni zesihlabathi ezinotshani obuncane, izindawo zezihlahla nezindawo eziphakathi nezwe, kanye namahlathi azungeze amachibi. Ama-Laysan teals abuye avakashele izindawo ezinodaka nezodaka. Zondla emini nasebusuku, zihlala njalo isikhathi eside ezindaweni ezinokudla. Ukuba khona kwemithombo emisha yamanzi nakho kuyisimo esibalulekile sokuba khona kwamathile aseLaysan.
Ukusabalala kwetiye yeLaysan.
AmaLaysan teals ahlala endaweni encane ngokwedlulele, ebangeni elingamakhilomitha angama-225 esiqhingini esiseduze engxenyeni esenyakatho nentshonalanga yesiqhingi saseHawaii. Lesi siqeshana somhlaba siyisiqhingi sentaba-mlilo, esikala u-3 km ngo-1.5 km, futhi indawo yaso ingeqi kumahektha angama-370.
Izindawo zokuhlala ze-Laysan teal.
Ama-teys ama-Laysan atholakala emachwebeni anamanzi abilayo, lapho ehlala khona njalo.
Izici zokuziphatha kwethala le-Laysan.
AmaLaysan teals ahlala ngababili noma ngamaqembu amancane. Bathutheleka ku-molt ngemuva kokuzala. Ngezinye izikhathi izinyoni zisebenzisa izigaxa ezincane zamanzi olwandle ezisele emanzini ashubile ukuze zibhukude, mhlawumbe ngenxa yokuthi amanzi apholile lapho kun echibini. Bese behlala phansi ukuze baphumule emanzini angajulile ukuze bafudumale futhi basakaze izimpaphe zabo ngemuva kokugeza, ngezikhathi ezinjalo abakutholi ukudla. Ama-teys ama-Laysan awalokothi abhukude kude kakhulu nogu, agweme amagagasi amakhulu futhi akhethe amanzi angenamanzi athule. Ngesikhathi sasemini, izinyoni zicasha emthunzini wezihlahla noma izihlahlana ezinkulu ezimila emagqumeni.
Ukuzala Teal Laysan.
Yonke imininingwane yesiko lama-Laysan teal courtship emvelweni ifundwe ezinyonini ezithunjiwe, futhi iyafana nokuziphatha kokukhwelana kwedada lase-mallard. Lezi zinyoni zindawonye futhi zinobudlelwano bomshado obuhlala isikhathi eside ukwedlula amadada atholakala kuleli zwekazi.
Njengamadada amaningi, ama-Laysan teals akha isidleke ngezinto zokutshala. Mncane, uyindilinga futhi uvame ukufihlwa phakathi kohlaza.
Ulwelwesi lubekwa ngabesifazane kusuka kuye phansi. Isikhathi sokufaka isidleke side, kepha isikhathi siyahlukahluka, mhlawumbe ngenxa yezinguquko ezingeni lamanzi. Ama-Laysan teals ajwayele ukuzala entwasahlobo nasehlobo, kusuka ngoMashi kuya kuJuni noma kusuka ngo-Ephreli kuya kuJulayi. Ubungako bokubamba bunesizotha, imvamisa kusuka emaqanda amathathu kuye kwayisithupha esidlekeni. Insikazi ifukamela ibamba cishe izinsuku ezingama-26.
Izinkukhu ziholwa futhi zondliwe ezinsikazi, yize kwesinye isikhathi iduna liseduze. Kubalulekile ukuthi amaphuphu achamisele phakathi kwamasonto amabili okuqala, ngoba imvula enamandla ingadala ukuthi inzalo ife. Amachwane avikelwa yidada elidala lize likwazi ukuzimela. Mhlawumbe, ukuhlanganiswa kwama-broods amaningana weminyaka ehlukene, okwenzeka kaningi.
Umsoco wethisi we-Laysan.
Ama-Laysan teals akhetha ukondla ama-invertebrate cishe unyaka wonke.
Ehlobo, izinyoni ezindala zisusa inyamazane yazo odakeni nasodakeni ngomlomo wazo ngokunyakaza okubukhali.
Babuye bahlole izidumbu zezinyoni ezifile ukukhipha izibungu zezimpukane noma ezinye izinambuzane. Imfene, egcwele echibini, nayo ingumthombo obalulekile wokudla. Ama-Laysan teals ayo yonke iminyaka azulazula ebusuku ezindaweni eziphakeme zesiqhingi efuna iziphungumangathi zezinhlobo zamabhu, ezigcwele enhlabathini enesihlabathi. Echibini azikho izitshalo zasemanzini ezikulungele ukudla, ulwelwe lunzima kakhulu ukuthi lungadliwa. Okwamanje akwaziwa ukuthi imbewu nezithelo ezidliwa yiLaysan zidla ini. Mhlawumbe kusetshenziswa imbewu ye-sedge. Into ebalulekile yokudla yi-Scatella sexnotata, ubuningi bayo obuholela ekwandeni kokukhiqizwa kwetiye yeLaysan.
Isimo sokulondolozwa kwetiye yeLaysan.
I-teal yaseLaysan ihlukaniswa njengengozini. Lolu hlobo kukhulunywa ngalo kwiSithasiselo se-CITES. Uhlala eNational Wildlife Refuge eHawaii.
Ukuvikelwa kwetiye yeLaysan.
Ukonga itiye leLaysan, uhlelo oluphelele lokubuyiselwa kwezinyoni lwenziwa yi-United States Fish and Game Services. Ngo-2004-2005, izinyoni zasendle ezingama-42 zasuswa eLaysan Island zayiswa eMidway Atoll. Iphrojekthi, esebenza eMidway Atoll, ifaka phakathi ukuqapha, ucwaningo lwezemvelo nolwabantu, kanye nokwenza ngcono okwakudala nokwakhiwa kwamaxhaphozi amasha anamanzi ahlanzekile. Isu elilandelwayo lifaka ukufakwa kwamanzi njalo ngonyaka, ukukhipha nokuhlanza indawo egcina amanzi ukuze kususwe imfucumfucu enqwabelene, kusetshenziswa imishini esindayo namaphampu aphathekayo ukwenza ngcono ikhwalithi yamanzi.
Izindlela zokongiwa kwemvelo zibandakanya ukunweba izindawo zokwakha izidleke nokutshala utshani besoyi bendawo.
Ukususa amagundane esiqhingini esinesihlabathi esiqothula uhlaza. Ukubuyiselwa kwemvelo kabusha kwabantu abathathu abengeziwe bamadada angavamile. Qinisekisa ukubhekwa ngokuqinile ukuvimbela ukwethulwa ngengozi kwezitshalo ezingajwayelekile, izinambuzane ezingenamgogodla nezilwane ezingathinta kabi itiye laseLaysan. Qhubeka nokususa izilwane ezidla ezinye ukuze kuhlaliswe izinyoni kwezinye iziQhingi zaseHawaii. Hlola ukuhlukahluka kofuzo kwabantu bese ufaka abantu abasha. Ukugonywa kwamadada eMidway Atoll kungaphansi kokucwaninga ukuvimbela ukusabalala kwe-avian botulism.
