I-Northern fur seal iwuphawu oludliwayo, isihlobo esiseduze kakhulu se-Arctic fur seal.
Lesi silwane sangaphansi kwezimpawu zamanzi ezinamakhaza, izinsikazi zazo zincane kakhulu ngobukhulu kunabesilisa.
I-Northern fur seal (i-Callorhinus ursinus).
Ukubukeka kwezimpawu zoboya kanye nosayizi wazo
Owesifazane ngokwesilinganiso unesisindo esingamakhilogremu angama-60-70 futhi akhula aze afike ku-1,4 m ubude.amadoda angaphezulu kakhulu kwesisindo: ama-200-220 kg, ubude bomzimba ongu-2.2 amamitha. Isisindo esiphezulu sesilwane, esaphawulwa ngochwepheshe - ama-320 kg.
I-fur seal inejazi elimfushane elinsundu. Abesifazane bahluka kancane kwabesilisa ngemibala. Kodwa-ke, ngezinye izikhathi izinsikazi zitholakala lapho isikhumba sinombala onsundu ngombala. Izinsana zensimbi yohlobo lwaseningizimu zizalwa ngoboya obumnyama, okuthi ngemuva kokuqala kokutholwa zithole isigaxa segolide.
I-Northern fur seal iyisiqalo se-eyred.
Ukuziphatha kwezilwane nokondleka
Abamele lezinhlobo zingabhukudi abahle kakhulu, abakwaziyo ukungena ekujuleni kwamamitha angama-200. Amakha afudumele amancanyana kanye nengqimba yamafutha avikela ngokuphelele umhlaseli ku-hypothermia, ngoba amakati achitha ingxenye yempilo yawo emanzini abandayo asenyakatho.
I-Northern fur seal ihlala oLwandle iPacific, ezifundeni zalo ezisenyakatho. Izifunda zaseningizimu lapho umngcele wendawo yokuhlala yalolu hlobo luqala khona ukusuka empumalanga yesiqhingi saseJapan kuya emanzini asogwini aseningizimu yeNhlonhlo yaseCalifornia, kanye nolwandle iBering ne-Okhotsk.
Isiyingi seNyakatho Fur.
Njengamanje, kunezigidi eziyi-1,1 zalezi zilwane, ingxenye yazo ekhetha ukuhlala ezifundeni zasempumalanga zoLwandle iBering. Cishe eziyizinkulungwane eziyikhulu zamakhulu ama-fur seal ahlala esifundeni esiseningizimu-ntshonalanga yoLwandle i-Okhotsk nangasogwini lweSakhalin. I-Kuril Islands yanikeza ezinye izilwane eziyizinkulungwane ezingama-70 lolu hlobo. Izinsalela zabantu zihlala enyakatho-ntshonalanga yeNyakatho Melika kanye nasogwini lwaseCalifornia.
Iziphethu zohlobo lwaseNyakatho zinomkhuba wokufuduka kakhulu ukusuka kuma-rookeries abo. Ngemuva kokuphela kwenkathi yokuzalela, ethatha izinyanga ezintathu kuya kweziyisihlanu, izilwane ziphila impilo yobumnandi kulwandle olukhulu olwandle. Ngezikhathi ezithile bangahlangana ngamaqembu amancane, kepha ikakhulukazi baphile impilo bebodwa. Ebusika, bondla olwandle, emhlabeni ngaphandle kokuvela nhlobo. Lapho kuqala intwasahlobo, babuyela ekuzulazuleni kwabo kwendabuko.
Njengazo zonke izimpawu, izimbambo zoboya zithanda ukukhipha.
Ukudla kwe-fur seal kuyizinhlanzi ne-shellfish. Lezi zidlova ezinamandla kwesinye isikhathi zihlaselwa ibhubesi lasolwandle, ngoba izindawo ezihlala izilwane ziyahlangana kanye kanye nezilwane ezihlala kuzo zivame ukuba seduze. Ukuhlanganiswa kwezimpawu zoboya kanye namabhubesi olwandle kungabonakala ogwini lwe-Komandorski Islands naseziQhingini zaseKuril.
Ukuzala
Abesilisa, ngemuva kokushayisana okunamandla nezimbangi, bakha izintokazi ezivela kwabesifazane. Ukondliwa kobisi kwezinsane ezizalwa kuthatha isilinganiso sezinyanga ezi-3-4. Ngo-Agasti, izingane ziyakhula futhi ngemuva kokuncibilika kwezilwane ziya olwandle - isikhathi sokudla siqala. Minyaka yonke, isikhathi sokudla sishiyelwa inkathi yokuzalela, iminyaka engaba ngu-20 empilweni yalezi zilwanyana ezincelisayo. Izimpawu zasolwandle zohlobo lwaseNyakatho ziye zahlala emvelweni iminyaka engama-20-25.
Izimpawu zoboya baseNyakatho ziphila iminyaka engama-25.
Izitha ZaseNyakatho Fur Seal
Ama-Fur seal anezitha ezesabekayo ukwedlula ibhubesi lolwandle. Le ndoda indoda emakhulu eminyaka ibizingela lolu hlobo. Uboya obuhle futhi obuqinile besilwane sasolwandle baziwa kakhulu. Kepha okwamanje, ukuxoshwa okungalawulwa kwezimpawu zamanzi kuyamiswa.
E-expanses yolwandle olunosawoti, abamele izinhlobo zalezi zinhlobo ngendlela yemikhomo yokubulala kanye noshaka. I-Killer whale ingahlasela uphawu lwengozi emanzini asogwini, ihlaselwa oshaka olwandle oluvulekile.
Izimo ezingezinhle zemvelo nazo zidlala indima ekunciphiseni inani lezimpawu zamanzi ezikhona.
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Incazelo Nezici
Izimpawu zoboya baseNyakatho (I-Callorhinus ursinus) - abazingeli abakhulu abangaphansi kwamanzi. Esakhiweni sabo sendabuko, bavuka ngendlela engajwayelekile futhi banomusa futhi bashanela echibini le-zoo ngejubane elikhulu kangangokuba bahlala bephutha inhlanzi noma amahlengethwa (isithombe 2). Cishe yonke ingxenye ebandayo yonyaka, izindikimba zizulazula ekukhuphukeni koLwandlekazi lwePacific kude nolwandle futhi azihambi emhlabeni cishe izinyanga eziyisikhombisa. Umbono omuhle kakhulu kanye nesakhiwo esikhethekile seso kuvumela ukuba babone inyamazane ngaphansi kwamanzi kude, ngisho nasebumnyameni. Amehlo amakati makhulu kakhulu, anombala onsundu, avikelwe yifilimu e-horny eqinile ewavikela emanzini olwandle we-caustic (isithombe 1 no-1-a). Izinzwa ezinomsindo we-vibrissa zithatha okunyakazisa okuncane okuqhamuka enhlanzini edlula, ukuzwa okuhle kusiza ukuzwa noma yikuphi ukugqobhoza emanzini (isithombe 3, 4). Ngemuva kokunquma ukuthi inyamazane itholakala kuphi, uphawu lubhukuda ngokushesha futhi lubambe umlomo wayo we-toothy - futhi luzondla ngezinhlobonhlobo zezinhlanzi, squid ne-cuttlefish.
Isici esiyingqayizivele uphawu lwezintambo (njengazo zonke izimpawu zamatshe) - ama-auricles amancane kodwa abonakala ngokusobala angaphandle (bheka isithombe 4). Lapho izimpawu zigxambukela, imiphetho yazo yangemuva isondele kakhulu, ivimbela amanzi ukuthi angangeni.
Amaphinifa angaphambili uphawu lwensimbi zifana namaphiko enyoni - kunjengokungathi iyandiza emanzini, iyazishukumisa, kuyilapho amafulethi asemuva edlala indawo yomsakazo kanye ne-balancer. Emaphethelweni eminwe ngayinye emane yamapheshana angemuva kukhona imidwebo yokuthi ikati lidinga ukuhlanganisa nokuxubha ijazi (isithombe 13). Umzimba wamakati uguquguqukayo kakhulu, futhi amafifilili aselula kakhulu kunawezimpawu zamanzi zangempela, futhi asetshenziswa njengokusekelwa lapho ehamba emhlabeni. Isibonelo, ikati lingagoba kalula futhi liqalise ngamaphini alo angemuva (isithombe 5, 6, 9, 10). Emvelweni, la makhonkwane akwazi ukuphuma emanzini aphumele emanzini ashelelayo futhi acishe abe yimifantu emincane. Ekuthunjweni, bazibolekisa kahle ngokuqeqeshwa futhi bakhombise izimangaliso zokuziqeqesha. Ngaphandle kokuphoqelelwa okukhethekile, izimpawu zamanzi zifunda ukuhamba nokuma emaphepheni angaphambili (isithombe 12).