
aastaart borialis

astartidae kudumbatthile oru inam bivalve molaskaanu astaartt borialis allengil northen astaartt. vadakke amerikkayile atlaantik theerathu greenland muthal masaachyusets vare ithu kaanapedunnu.
vitharanam "eiii. artic, pasaphik, atlaantik samudrangalile boriyal pradeshangalil borialis kaanapedunnu. nilavil baltic kadal, russiayile velutha kadal, vadakkan alasca ennividangalil ninnu padanangal saambilukal shekharichittundu. pasaphik samudrathil okhotsku kadal muthal aleusian dveepukal vareyum russiayile artic samudrathil baarants kadal muthal chukki kadal vareyum atlaantik samudrathil newfoundland muthal greenland vareyum island vareyum europil vadakkum baltic kadalilum janasamkhya vyaapakamaanu. eiii. borialis adisthaanaparamaayi aazham kuranja oru jala inamaanu (0-300 meter). lavanamsham kuravaayathinaal a. borialis uppuvellathe mukki uyarnna lavanathvamulla aazhameriya pradeshangalil vasikkunnu. opttimal lavanatha paridhi 14 muthal 30 pii. ezz. yuu vareyaanu. ithinu 10 muthal 15 pii. ezz. yuu vare lavanamshangalil athijeevikkaan kazhiyum, kuranjathu 6 muthal 8 pii. ezz. yuu vare sahishnuthayund.
roopaghadana savisheshathakal thekkan labrador muthal uyarnna artic vareyulla janussinte vishalamaaya vitharana shreniyum eee vishalamaaya shreni moolamundaakunna variable bhauthika paristhithiyum kaaranam, astart januss valare variable polymorph logical aayi kanakkaakkappedunnu.
aastaart janussinte roopaghadana
vyathyastha speesheesukalile amgangal thammilulla vyathyaasangale soochippikkunna niravadhi bhauthika savisheshathakal janussinullilundeng bivalve molaskukal thirichariyaan kazhiyum. keel ghadana, uparithala shilpam, pallukalude ennam, ambo aakruthi, periostraakkatthinte niram, paaliyal sainas aakruthi ennivayum mattu niravadhi udaaharanangalum ulppedunnu. aastaart" janussinte baahya savisheshathakalil periostracom, vaariyellukal, mothatthilulla shell aakruthi enniva ulppedunnu. deerghavrithaakrithiyilulla, andaakrithiyilulla allengil subquadrate vyathyasangalulla praadhamikamaayi thrikonaakrithiyilulla oru shell rooparekha eee janussil undu. eee januss thulyamaanu, neelam uyarathinu thulyamo athinekkaal kooduthalo aanu. eee janussinte shilpathil commerginal vaariyellukal adangiyirikkunnu, avayil bhooribhaagavum thulya akalamullathum nertthathum vishalavumaaya vaariyellukal vare vyathyaasappettirikkunnu. esquimultic kramarahitavum alasamumaaya vaariyellukalund. ponthal kooduthalum veethiyum veerppumullathaanu; chila enangalkku saadhaaranayaayi madhyarekhayude dorsal mathramulla ponthal ponthal undu. pokkilukalil pazhaya saambilukalil mannolipp undakaan saadhyathayund, ithu praayapoorthiyaakaathavarum muthirnnavarumaya vyakthikal thammilulla roopathil vyathyaasathin kaaranamaakunnu. periostracom ithinu kattiyullathum thilangunnathu muthal silk muthal mangiyathu vare vyathyaasappettirikkunnu. ithu saadhaaranayaayi manja muthal karupp vare chuvapp-thavitt niravum anuyojyavumaayirikkum.  
eiii" yude roopaghadana savisheshathakal verthirichariyuka. boralis "
aastaart borialis" ennathinte shell aakruthi andaakrithiyilullathum potthikal upakendramaayi, madhyarekhayude dorsal mathramullathum praayamaayavaril palappozhum kshayichathumaaya sub trigonalayi subquadrate cheyyappedunnathumaanu. eee shilpathil neriya, commerginal vaariyellukal allengil stry adangiyirikkunnu, koodaathe pokkilukalude aadya 6-8 millimeterinu chuttum vaariyellukal uyarthiyirikkaam. periostracom naarukalullathum sthirathayullathum kattiyullathum manja muthal karupp vare niramullathumaanu. "aastaart borialis" nuu sakthamaaya keelum rund pramukha nimphukalumaayi bandhippichirikkunna sakthamaaya asthibandhavumundu. idathu vaalvinu moonnu pallukalundu, randennam valia cardinal pallukalum moonnaamathethu valare cheruthum aprasakthavumaan. valath vaalvinu rund pallukalundu, munbhagam pinn pallinekkaal valuthum veethiyullathumaanu. adductor peshi vadu aazhathil mathippulavaakkunnu, koodaathe muun pedal retractor vadu pradhaanamaan. paaliyal sainas illa, paaliyal line idungiyathum chilappol mangiyathumayirikkum. interior marjin mikkavayum minusamaarnnathum aniyanthrithavumaan, valare kurachu peril avaa valare neriya krinuleshanukalaayirikkaam. mikkavarum ellaayppozhum, krinuleshanukalude abhavam "a" yeei verthirikkum. borialis mattoru "aastaart" inamaanu.
samriddhiyudeyum jaivabhaarathinteyum kaaryatthil, a. artica eiii. borialis ettavum uyarnna moolyamullathum avayude valipavum praayavyathyaasavum pariganikkathe thanne periostraakkatthinte varnna spectrathil kaazhchayil valare saamyamullathumaan. eee enangalude shell kattiyullathum bhaaramullathumaan, tissue bharam motham bhaaratthinte 11-16% maathramaan, ithu saadhaaranayaayi oru inathinu report cheytha moolyangalumaayi poruthappedunnu. artica eiii. avarude bhoomishaasthraparamaaya shrenikalude mattu bhaagangalil borialis. athinaal, a yude tissue bharam. baltic kadalil ninnulla borialis motham bhaaratthinte sharashari 14.5% aanu, athaayath.iii.shell valare valuthum kharavumaanu. ithu kadinamaaya charal kalarnna adithattil jeevan nilanirthunnathinaayi eee molaskukalude poruthappedutthaline prathifalippikkunnu, nerttha shell ulla mattu pala epi, infounal jeevikalil ninnu vyathyasthamayi, thaazhathe substratinte mechanical pravartthanatthilum traalukaludeyum dredgeukaludeyum keezhil avaye athijeevikkaan sahayikkunnu. sajeevamaaya demersal mathsyabandhanathinte saahacharyangalil.
astaartt boriyaalisinte ayussa mattu astarttidukaleppole, "aaaa. boriyalisinu valia (150-200 μm) manjakkaru adangiya muttakalundu, athil ottikkunna puram cover undu, ithu janasamkhyaye koottangalaayi sthirathaamasamaakkunnu. muttayidunna samayam pradeshathinanusarichu vyathyaasappedunnu. greenlandilum vadakkan atlaantik samudrathilum october muthal desember vareyaanu muttayidunnathu. baltic kadalil, vyakthikalkk ekadesham varsham muzhuvan paakamaya muttakalum beejavum undu, oru nischitha kaalayalavilethinekkaal bhaagikamaayi spaan (niravadhi edavelakalil sambhavikkunnu). eiii" yude bhooribhaagam janasamkhyayum. borialis "thanutha, samudra/uppuvellathil parimithappedutthiyirikku, ithu 8-35 psu enna lavanatha paridhi sahikkunnu. velutha kadalil, "eiii. borialis "aazhaparidhiyiludaneelam eathaandu thulyamaayi vitharanam cheyyappedunnu" aastartte borialis "baltic kadalinullile anoxiayekkurichu niravadhi padanangalude vishayamaan, koodaathe anoxia sahishnuthayullathaanennu kandethiyittundu, ennirunnaalum anoxic avasthakalumaayi aavarthichu kooduthal exposure cheiyunnathu oduvil maranathinu kaaranamakum. uthbhavathinte mattu pradesangalumaayi thaarathamyappeduthumbol, "eiii" yude muttayidal season. baltic kadalile borialis valare neenda kaalayalavil pakwathayulla muttakalum beejangalum kaanikkunnu, shaithyakaalathum vasanthakaalathum ithu paramavadhi kaanapedunnu.
aadhunika bivaalvukal saadhaaranayaayi aayussil vardhanavum akshaamshathodoppam voonn bertalanfi keey kurayunnathum kaanikkunnu, ithu bivaalviyayiludaneelavum grouppukalkkullilum nilanilkkunna oru paatten aanu. a" ykkullile paattenukal. borialis kooduthal sankeernamaanennu thonnunnu. ennirunnaalum "a" yude ayuss nirnnayikkunnathinulla reethikal aayirikkam ithinu kaaranam. borialis athinte paridhiyiludaneelam report cheyyappetta ayuss pole thanne vaividhyapoornamaanu. athinte vadakke attathu, parambaraagatha isotope sclerocronology "a" kaanichittundu. greenlandil 150 varshavum velutha kadalil 48 varshavum athunna borialis asaadhaaranamaayi deerghakaalam nilanilkkum.
paaristhithika pankk charal adangiya cheli manal eshtappedunna avashishta uparithalathinu 2 millimeter vare thazheyaayi kuzhichitta nilayil kaanapedunna oru infouna suspension feedaraanu "aastaart borialis". velutha kadalil, avarude pradhana bhakshya srothassaaya phytoplankton eprilil vasanthakaalath pookkaan thudangunnu, pakshe juulai, august maasangalil kodumudi pookkunnathuvare samriddhamaayi kuravaayirikkum. novemberil aise roopappettathinushesham, vasanthakaalam vare bhakshanathinte samriddhi kuravaanu. [3] mattu jeevajalangalkkoppam, eee molaskukalum samudra aavaasavyavasthayil oru pradhana punk vahikkunnu, kaaranam avaa benthik samoohangalude oru pothu gadakavum niravadhi vettayaadunna malsyangaludeyum mrugangaludeyum bhakshana inavumaanu. eee molaskukal paleantological, paleobiological gaveshanathinum pradhaanamaan.

