Bering teku

Bering teku

Daya daga cikin sanannun tekuna a duniya kuma wanda ya raba Amurka da Rasha shine bering teku. An kira shi ne don girmamawa ga Vitus Jonassen Bering. Labari ne game da wani dan Denmark mai bincike wanda ya jagoranci balaguro zuwa yankin Beringia a cikin karni na XNUMX. Ruwa ne wanda yake a arewacin Tekun Fasifik kusa da Alaska da Rasha. Yana da wasu halaye na musamman da kuma bambancin halittu masu ban sha'awa don sani.

Saboda haka, zamu sadaukar da wannan labarin don gaya muku duk halaye, halittu da halittu masu yawa na Tekun Bering.

Babban fasali

samuwar teku mai rairayi

Tekun Bering shine ke da alhakin raba shi da sauran yankin Pacific saboda kasancewar tsibiran Aleutian, da Alaska Peninsula. Daya daga cikin sanannun sanannun wannan yanki shine hanyar Bering. Tana da fadin kilomita 85 kuma ya haɗu da Tekun Chukchi da Tekun Arctic. Duk wannan yanki da ya haɗu tsakanin ɗaya da ɗayan shine Bering Strait.

Idan muka binciko dukkan tekun daga taswira, za mu ga cewa ta mamaye murabba'in kilomita miliyan biyu. Halin wannan teku yana da ban sha'awa sosai. Kuma shine cewa yana da sifa mai kusurwa uku kuma yana ɗauke da Bering Strait, Bristol Bay, Gulf of Anadyr da Norton Sound. Bugu da kari, wannan tekun ya kunshi wasu tsibirai da suka hada da masu zuwa: Diomedes, Tsibirin San Mateo, Tsibirin Karáguinski da Tsibirin Sledge, kuma kusan kanunun ruwa guda 16.

A cikin wannan tekun akwai kwararar ruwa da ke gudana Alaskan na yanzu yana rinjayi shi. Ruwan da ke kawo ruwa a cikin wannan kwarin ya fito ne daga wannan rafin. Dangane da yanayin halittar wannan teku, an san cewa sararin samaniya yana da sanyi yayin da zurfin ruwa ke da dumi. Ana gabatar da ruwan dumi daga Tekun Fasifik. Wannan ruwan yana motsawa ta cikin matattarar tsibirai da yawa zuwa kudu.

Daya daga cikin halayen da wannan sanannen sanannen sanannen shine saboda yanayin yanayin kasa da kuma dalilai daban-daban bangaren arewa yakan kanyi sanyi a lokacin sanyi. Gabaɗaya yana da kyakkyawar teku mai sanyi. Kuna iya ganin cewa yawancin hunturu suna daskarewa kuma lokacin bazara zaku iya rikodin yanayin zafi na ƙasa da ƙirar digiri. Duk da abin da mutum zai iya tunani, gishirin wannan teku yana da ƙasa ƙwarai. Za a iya samun ɗan ƙaramin ƙarfin gishiri a wasu wurare masu zurfi. Koyaya, kasancewar irin wannan zurfin canjin, za'a iya cewa rabin teku yana ƙasa da zurfin mita 200. A wasu sassa, kasa da mita 152 kuma a cikin wasu ya kai zurfin mita 3.600.

Mafi zurfin zurfin Bering Sea yana cikin Basers Basin kusan zurfin mita 4.067.

Samuwar Tekun Bering

kamun kifi

Dole ne a yi la'akari da cewa, don samuwar Tekun Bering, dole ne a kimanta shekarun Tekun Fasifik, tunda yana da tasirinsa sosai. Yawan shekarunsa kusan shekaru miliyan 750. Lokacin da Rodinia, wanda aka fi sani da babbar ƙasa fiye da shekaru biliyan 1.000 da suka gabata, ya fara samuwa, wannan yankin gaba ɗaya yana kan hanyar rabuwa. Yayin da ƙasar ta rabu, Tekun Fasifik ya raba kuma ya ba da Tekun Bering.

Wannan tekun yana dakatar da sauran tekun a lokacin Zamanin Eocene. Babban ɓangaren da ke da alhakin raba ragowar tekun shi ne ƙirƙirar baka na Tsibirin Aleutian. Tekun Bering ya samo asali ne ta hanyar babban shimfidar yanki wanda ke da iyaka ta sarkar Tsubirin Aleutian da Bering Strait. Wannan dandamali ya samo asali ne sakamakon karowar dandamali a farkon lokacin Cretaceous tsakanin gabashin Siberia da Bangaran Gangar Arewa. Yankin Gangar Arewa yanki ne wanda yake a arewacin Alaska.

Bambance-bambancen halittu na Tekun Bering

Eringuntataccen ruwa

Kamar yadda muka ambata a baya, teku ce wacce take da nau'ikan dabbobi da tsirrai da yawa. Yi la'akari da ku na dogon lokaci azaman tsarin halittun ruwa mai mahimmanci. Duk yankunan arctic da suke tsakanin Rasha, Alaska da Kanada suna amfanuwa da kasancewar wannan halittar. Kuma wannan saboda a cikin ruwansa zaka iya samun ɗimbin dabbobi masu shayarwa, kifi, mollusks, crustaceans da sauran dabbobi masu girman microscopic.

Akwai fiye da nau'ikan 160 na algae masu iyo waɗanda ke da yanayin halittunsu a cikin Tekun Bering. Misali, zamu sami katuwar algae mai ruwan kasa wadanda zasu iya samar da dazuzzukan daji a wasu yankuna na ruwa. Daga cikin jinsin dabbobi da suka fi kowa yawa a cikin Tekun Bering akwai masu zuwa:

  • Walrus
  • Warshen dabba
  • Whale mai rauni
  • Arewacin Pacific Whale Dama
  • Zakin Tekun Steller
  • Abincin ruwa
  • Ga kowane
  • Salmon
  • Ganyayyaki
  • Kalmar Pacific
  • Katuwar jan kaguwa
  • Bishiya
  • Taurarin teku

Kuma jerin suna ci gaba. Akwai jimillar kusan nau'ikan kifi 420 waɗanda suka taimaka yaɗuwar kamun kifi da kasuwanci da shi. Koyaya, akwai wasu tasiri da barazanar da ke shafar tekun Bering.

Barazana

Ka tuna cewa tasirin ɗan adam yana haifar da matsaloli a cikin Tekun Bering. Kuma yanki ne da yake da matukar rauni ga mummunan tasirin dumamar yanayi. Kasancewa yanki kusa da tekun Arctic tashin ruwan yana shafar ta sakamakon narkewar kankarar kankara. Bugu da kari, dole ne a yi la’akari da cewa, kasancewarta teku mai matukar amfani a cikin kamun kifi, tana fama da amfani kuma matsaloli sun haifar da nau’ikan da yawa. Misali, yankin yamma da yamma yana cikin yanayin kamun kifi da kamun kifi ba bisa ka'ida ba.

An gurɓata sassan Tekun Bering tare da ɗimbin ƙwayoyin halittar jiki da abubuwa masu guba. Matsalar waɗannan abubuwan shine sun fi wahalar kawar dasu. An samo jikin dabbobi da yawa polyploryl polychlorinated wadanda suke ci gaba da gurɓataccen gurɓataccen abu, alamun mercury, gubar, selenium da cadmium. Hakanan muna ganin wasu tasirin tasirin zirga-zirgar jiragen ruwa da ke damun rayuwar teku da kuma haɗarin malalar mai.

Ina fatan cewa tare da wannan bayanin zaku iya koyo game da Tekun Bering.


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