
hesatta baank

florencinaduthulla origon theerathu ninnu 55 kilometer (kilometer) akale sthithicheyyunna oru paarakkettaanu hesetta baank, ekadesham 44°enn, 125°dablyu kendreekrithamaanu, ekadesham 29 kilometer neelavum 13 kilometeriladhikam veethiyumundu. paaristhithikavum samudrashaasthraparavumaaya praadhaanyamulla oru pradesamaanu hesetta baank. theeratthinullile athulyamaaya bathemetric savisheshathakalum seasonal sarkuleshanum saambathikamaayi pradhanappetta malsya enangalude vaividhyathin aavaasavyavastha nalkunnu.
charithraatheethakaalatthe manushya kudiyettathekkurichulla nilavile daaranayilum hesetta baank oru pradhana punk vahikkunnu. ekadesham 1,000 varshangalkk munbu avasaanathe himanadeeya thaazhnna nilayil, charitraatheethakaala manushyar vadakkukizhakkan eshyayil ninnu vadakke amerikkayilekku kudiyeri. hesetta baank athinte bhooprakrithiyum roopaghadanayum kaaranam eee charitraparamaaya kudiyettatthinte oru saadhyathayulla mekhalayaanennu shaasthranjar anumaanikkunnu.
geomorphology.
roopeekaranam.
central origon theerathu kondinental shelfinte baahyaparidhiye vibhajikkunna nehalem, stonvaal, kokvil ennivayulppede saadhaaranayaayi thirichariyappedunna naalu kadaltheera paarakkettukalil onnaanu hesetta baank. samudra phalakangalude adhochalanamaan theerangal roopappeduthiyathu, ithu bhookhanda puramthodinte uyarcha srishtikkukayum innu theerangalil kaanapedunna paarakalil bhooribhaagavum thurannukaattukayum cheythu. eee paarakalil chilath, prathyekichu hesetta theerathu kandethiyava, plistoseen kaalaghattatthilum myoseenu munbum pazhakkamullathaanu. eee pazhaya paarakalude saannidhyavum theerangalkku thaazheyulla madakkukalum thakaraarukalum eee adhomukhathaykkum uyarchaykkum thelivukal nalkunnu.
bathmetry slope.
origon theerathu ninnu kondinental shelfinu ekadesham 17 muthal 74 kilometer vare veethiyundu, theerarekha muthal kondinental charivinte attam vare, athinte baahya paridhiyil paramavadhi 145 muthal 183 meter (meter) vare aazhathil athunnu. bhookhanda charivilekku maarumbol shelfinu thaarathamyena kuthaneyullathum thaazhekku abhimukeekarikkunnathumaaya samudranirappundu. ennirunnaalum, bhookhanda puramthodinte uyarcha kaaranam, hesetta baank bhookhanda shelfinte bahyaparidhi vipuleekarikkukayum thaarathamyena aazham kuranja bathimetry kuranja aazhamulla kadaltheera charivum ulla oru pradesham srishtikkukayum cheiyunnu. karayude vashath, theeram 60 meter aazhathil aarambikkukayum kramena aazhathilaavukayum kadaltheerathu athunnathuvare aazhathilaavukayum avide bathimetry pettennu 1000 meter aazhathilekk veezhukayum cheiyunnu. theerathu vadakkum thekkum mukalbhagam adangiyirikkunnu, avaa chuttumulla kadaltheerathekkaal (athippazham) bathimetry vyakthamaayi aazhamillaatha sholukalaanu. 2). eee rund kodumudikalum verthirikkunnathu samudranirappu aazhathilaakukayum ekadesham 104 meter aazhathil athukayum cheiyunna oru vishalamaaya pradesamaanu-ithu oru saddle ennum ariyappedunnu.
avashishta swabhaavasavisheshathakal.
kizhakk, hesetta theeram kuthaneyum minusamarnnathumaaya bhookhanda shelf kondu bandhippichirikkunnu. ithinu vipareethamaayi, baankinte bhooprakrithi thaarathamyena sankeernavum kramarahithavumanu. aazham kuranja (<100 meter) theerathu, pradhaanamaayum paarakalum paarakkettukalum chernnathaanu eee theeram, avaa cheria thaazhvarakal polulla savisheshathakalaal verthirikkappedunnu. samudranirappu ippol ullathinekkaal valare kuravaayirunna charitraparamaaya kaalaghattangalil thiramaalakalude mannolippil ninnaan eee thaazhvarakal srishtichathennu karuthappedunnu. kooduthal aazhathil, kadaltheeram cheli, cheli thudangiya cheria kombukalilekkum nerttha dhaanya avashishtangalilekkum maarunnu. eee sankeernamaaya kadaltheeram rockfish mattu demersal speesheesukalum polulla benthik-resiple speesheesukalkk pradhana aavaasavyavastha nalkunnu. koodaathe, krasttal uyarchayum transform faalttukalum moolamundaakunna chalanagal moolamundaakunna bhooprakrithiyile kramarahitata, 100 muthal 600 meter vare aazhathil sambhavikkunna avashishtathil ninnu meedhane vaathakam purathuvidaanum anuvadikkunnu.
bhauthika samudrashaasthram.
general origon koost ooshyan dynamics.
hesetta baankinte samudra pravaahangalum chalanathmakathayum muzhuvan origon theerathinum samaanamaan. origon theerathu, california vaidyuthadhaarayaanu pasaphik samudrathile pradhana pravaham. ithu thekkott ozhukukayum padinjaaran theerathu thanutha sub artic jalam thaazhekku konduvarikayum cheiyunnu. california vaidyuthadhaarayude akathu ninnu vadakkott ozhukunna oru theeradesha vipareeta pravaahamaan davidson vaidyuthadhaara. theeradesha jalathinte sanjaarathilum ozhukkilum kaattum bhooprakrithiyum valia punk vahikkunnu.
origon theerathu seasonal kaatt anubhavappedunnu, thudarnnu rund vyathyastha samvidaanangalkku keezhil pravartthikkunnu mukalilekku kayarunnathum thaazhekku pookunnathum. venalkkaalath, saadhaaranayaayi epril muthal septambar vare, kaattinte ozhukk saadhaaranayaayi thekkottaanu. thekkott ozhukunna eee kaatt uparithala pravaahangal theerapradeshathu ninnu akannupokaan kaaranamaakunnu, ithu ekmaan transport ennariyappedunna oru prakriyayaan. athinaal, theeradesha uparithala jalathinu pakaramaayi uyarnna pradeshangal kadaltheerathu ninnu thanuthathum poshakasamriddhavumaaya vellam konduvarunnu. shaithyakaalath kaatt praadhamikamaayi vadakkott ozhukunna samayat, thaazhekkulla vaasam prabalamaaya samvidaanamaayi maarunnu. thaazhekkulla vellam mukalilekku kayarunnathinte vipareeta reethiyil pravartthikkukayum theeradesha uparithala jalam aazhathilekk kondupookukayum cheiyunnu. shaityakaala thaazhnna pradeshangalile aadhipathya samvidaanathil ninnu venalkkaala uyarnna pradeshangalile aadhipathya samvidaanathilekkulla vasanthakala parivartthanam vegathilaanu, koodaathe eathaanum divasangalkkullil samudranirappil ekadesham 10 centimeter pettennulla idivum ulppedunnu. neremarichu, thaazhekkulla vellachaattathil ninnu thaazhekkulla vellachaattathilekkulla parivartthanavum athinte falamaayi samudranirappil undaakunna uyarchayum ganyamaayi kooduthal kramanugathamaanu. mukalilekku kayarunnathum thaazhekku pookunnathum saadhaaranayaayi kaalaanusrithamaayi eshtappedunnundengilum, kaattinte dishayil pravarthikkunnathinaal avaa eathu seasonilum sambhavikkam ennathu sradhikkendathaanu.
chuvade paryavekshanam cheythathupole, hesetta baankinte savisheshamaaya bhooprakrithiyile vyathiyanangal kaattil pravartthikkunna eee seasonal mattangal eee pradeshathe engane baadhikkunnuvenn ganyamaayi swaadheenikkunnu. vishalamaaya bhookhanda shelf ulla pradeshangal kaattil pravartthikkunna shakthikalodu shakthamayi prathikarikkaathathaanu eee swaadheenathinu kaaranam.
venalkkaala sarkkuleshan.
theeradesha jalathil prabalamaaya thekottulla kaatt sammarddam kaaranam seasonal uyarcha theerapradeshathe uparithalathilekku thanuthathum kooduthal saandravumaaya thaazhathe jalam kondupookunnu. uparithalathile euphotic mekhalayilekku poshakangal konduvarunnathaanu eee vellam. samudratheerathu ekadesham 7 digri selshyas muthal hesetta theeratthinte puram attathu 14 digri selshyas vareyaanu venalkkaala uparithala thaapanila. athesamayam, uyarnna saandrathayulla thaazhathe jalam vadakkottulla thaazhathe pravahangalaal theerathu ozhukunnu. hesetta theeratthinte puram thekkan bhaagathe thaarathamyena kuranja saandrathayulla vellavum thaazhathe saandrata feeldil undu. shaithyakaalath thaazhekku pathikkunnathu saadhaaranamaanenkilum, venalkkaala maasangalilum 2-10 divasam neendunilkkunna sambhavangal nireekshikkappettundu. udaaharanathinu, 2001leeii venalkkaalath 29 sathamaanam samayavum anukoolamaaya avasthayaayirunnu.
geostrophic jettu.
mukalile munvashath oru geostrophic mukalilethunna jettum undu. venalkkaala uyarchakkaalath, central origonil ninnu thekkott ozhukunna jettu ekadesham 100 meter isobathil shelfinte madhyathilaanu. athinte uparithalathinaduthulla vegatha sharashari 0.35 meter/second aanu, vyakthigatha sambhavangal 0.80 meter/secondil kaviyunnu. ithu chuttumulla jalavegathayekkaal vegameriyathaanu. hesetta baankinte bathimetry 200 meter isobathinte thekke attathu athunnathuvare karaykku chuttumulla thaazhathe contureukal pinthudarunnathinaal mukalilekku pookunna jettu kooduthal kadaltheerathekku neengaan kaaranamaakunnu. ivide, bhookhandathinte shelf theerapradeshathekku pettennu thirinjathine jettinu pinthudaraan kazhiyaathathinal ekadesham 0.5 serdrup thanutha kinner vellam aazhathilulla samudrathilekku kayattumathi cheiyunnu. aazhathilulla samudrathil nashtappedunna vasthukkalude alavu jettinte vegathaye aasrayichirikkunnu, ithu pradhaanamaayum kaattil pravartthikkunna pravaahangalude sakthiyaanu nirnnayikkunnath.
hesetta baankinte kadaltheerathinu chuttum uyarnna jettinte chalanam baankinte theerapradeshathe ozhukk ganyamaayi durbalamaakkunnu. eee abhayam nalkunna pradesham jala pazhsalukal thaarathamyena kooduthal kaalam theerathu nilanirthaan anuvadikkunnu. kooduthal kaalam nilanirtthal samayam ardhamaakkunnathu samudrajeevikalkku karayil kooduthal kaalam nilanilkkaan kazhiyum, ithu hypoxiaykkum jala aakramanathmaka enangal sthaapikkunnathinum saadhyatha vardhippikkunnu. theeratthinte thekkan abhayaarthikalaaya mekhalayil, aazhathilulla jala nirayumaayi poruthappedumbol ozhukkinte chuzhalikkaatt chalanam kaaranam vadakkottulla ozhukk palappozhum nireekshikkappedunnu.
shaityakaala sarkkuleshan.
vadakkottulla kaattinte sammarddam uparithala ekmaan gathaagathathe kadaltheerathekku maattaan kaaranamakunnathinaal seasonal downwelling choodullathum saandrata kuranjathumaaya uparithala jalam kadaltheerathekku kondupookunnu. uparithalathile uthppaadanakshamamaaya euphotic sonil ninnu jaivavasthukkale thaazhekku kadaltheerathekku kondupookukayum cheiyunnu.
eee shaityakaala maasangalilum shelf bathimetry topography chalanathmakathayil valia punk vahikkunnu. thaazhekkulla saahacharyangalil, bhookhanda shelfiloode 130 meter isobathil kendreekarichu vadakkott thaazhekkulla oru jettu undu, pakshe athu theerathinu mukaliloode neengumbol, athu 80 meter isobathilekku neengunnu. thekkott mukalilekku pookunna jettil ninnu vyathyasthamayi, vadakkott thaazhekku pookunna jettinu vegatha kuravaanu. athinaal, theerathinu chuttumulla athinte paatha athra shakthavum shradheyavumalla, athinte falamaayi theeradesha vyathichalanavum vipareeta pravaahangalum kurayunnu, uyarnna saahacharyangalil kaanunnu. jettinte inshore nannayi kalarnna vellathinte oru pradesamaanu. mothatthil, thaazhekkulla shakti kuranja oru mekhalayaanu baank.
bhaavi gaveshanam.
hesetta baankumaayi bandhapetta samudrashaasthraparamaaya chalanaathmakathayekkurichulla nilavile dhaarana valarukayaanenkilum parimithamayathinaal bhaaviyile gaveshanathinu valareyadhikam idamundu. nireekshicha daattayil bhooribhaagavum rund prograamukalil ninnaan varunnath. deseeya theeradesha samudra prakriyakalude (coop) padhathiyude bhaagamaayi naashanal sayans foundeshan (enn. ezz. eph) dhanasahayam nalkunna 5 varshathe padhathiyaanu koosttal ooshyan advances inn shelf transport (koost). 2001leeii venalkkaalathum 2003leeii shaithyakaalathum shekharicha vivarangalil bhooribhaagavum origon stettu yooniversitti (oosu), chaappal hillile north carolina yooniversitti (yuu. enn. sii), lamond-doherty erthu obsarvettari (ell. dii. iii. oo) ennivayil ninnulla pankaalikal ulppedunnathaanu. theeradesha samudrangalude (pisco) interdisiplinary padanangalkkaayulla pankaalittham mooringukaliloode daatta shekharikkukayum aantharika shelfinte origon uyarnna pradeshathekkurichulla arivu vipuleekarikkunnathil valia punk vahikkukayum cheythu.
thaarathamyena paryavekshanam cheyyappedaattha oru gaveshana mekhala eee mekhalayile hypoxic jalathinte roopeekaranathil jaiva, bhauthika prakriyakalude swaadheenamaanu. hypoxic sambhavangalekkurichulla gaveshanangalil bhooribhaagavum 2002 nuu sheshamaan nadathiyathenkilum palathum anjjaathamaayi thudarunnu. layippichathum kanikakal ullathumaaya dravyangalude vaasasamayavum paathakalum, prathyekichu shaithyakaalath, gaveshana thaalpparyamulla mattoru mekhalayaanu.
rasathanthram.
meedhane chorcha.
meedhane neerozhukku hesetta baankinte thaazhekkulla charivilaanu sthithicheyyunnathu, saadhaaranayaayi pokkmaarkkukal ennariyappedunna pradeshangalil klasttar cheythirikkunnu. thettukal neengunnathaanu pokkmaarkkukal roopappedunnathu, ithu adithattinullile aswasthathakalum avasthakalum maattaan kaaranamaakunnu. uyarcha kaaranam, avashishtatthile vathaka layikkal kurayukayum aathyanthikamayi samudranirappil ninnu vaathakam purathuvidukayum cheiyunnu. thermogenic, biogenic srothassukalil ninnum meedhane hydrateukalil ninnum meedhane vaathakam uthbhavikkunnu. uyarnna thapanilayilum marddathilum jaivavasthukkalude thermocatalitic degradation vazhi avashishtathinullil aazhathil thermogenic srothassukal roopappedunnu. methanogenic jeevikal jaivavasthukkalude apachayathinu kaaranamaakunnath jaiva srothassukalaanu.
pokkarmaarkkukal.
pokkmaarkkukal saadhaaranayaayi 100-200 meter vyasamullathum saadhaaranayaayi 150-400 meter aazhathilaan sthithicheyyunnathu. hesetta baankile pokkmaarkkukaliludam kumila roopeekaranavum microbial maattukalum nireekshikkappedunnu. theerathe avashishtangalile eee sookshumajeevikalude payakal veluthathum philamentus aanennu visheshippikkappedunnu. microbial maattukalil saadhaaranayaayi keemosinthattik jeevikal, beggiattova, theotrics philamentus bakteeriyakal, vaayurahita aarkkiyayude oru koottamaaya methanojan enniva vasikkunnu. clams polulla mattu jeevikal (udha.jii., "solamya" ezz. pii.), maraine bivalve molaskkukal (udha.jii.konkosel baisekta") enna padam ozhukkinu chuttumulla pradeshathu vasikkunnathayi kandethiyittundu. chila pokkmaarkkukalil carbonate roopappedunnathinte thelivukalum adangiyirikkunnu. neerozhukku chuttumulla bakteeriyakal nadathunna meedheyninte (oom) vaayurahita ooksideshanaanu carbonate roopeekaranangal nirmmikkunnath. eee aragonite paralukalkk negatteevu deltta moolyam kaanikkunna hesetta baankinu chuttumulla vividha sthalangalil alakkunna 13sii isotopic gadanayaanu uthbhavam. eee negatteevu moolyangal soochippikkunnathu shekharicha saambilukalile 13sii kurayunnu, ithu chemosynthesisinaayi meedheyninte microbial upayogavumaayi bandhappettirikkunnu. 13sii yude isotopic ghadana sthaanam anusarichu valare vyathyaasappedunnu, pakshe saadhaaranayaayi −30 Âpdb +/- 10Â aanu. mothatthil, theerathinu chuttumulla pokmaarkkukalkku mukalilulla meedhane saandrata littaril 6.4 enmol muthal littaril 54.2 enmol vareyaanu, valia saandrata saadhaaranayaayi samudranirappinu sameepamaan. uparithalathil meedheyninte saandrata 3 enmol/lii muthal 7 enmol/lii vareyayirunnu.
meedhane gathagatham.
hesetta theerathe neerozhukkangalil ninnu puranthallappedunna meedheyninte gathagatham kaaliforniyayude antharpravaahathinte ozhukkaanu. vaidyuthadhaara vaathakam vitharanam cheiyunnathu jalamsha sthiratha mekhalayilaanu, avide meedhane hydrateukalkku avashishtathil sthiramaayi roopappedaan kazhiyum. 100-480 meter aazhathil sharashari vaidyuthadhaarayude vegathaye adisthaanamaakki theerathe jala nirayilekku puranthallappedunna meedhane neekkam cheiyunna samayam ekadesham 22 manikkooraanennu kanakkaakkappedunnu. eee pradeshathe mothatthilulla meedhane gathaagathatthinte ekadesham 14 sathamaanam maathramaan microbial meedhane ooksideshan. shelfill, meedhane gathagatham nayikkunnath sambushteekaranam nireekshikkunna sthalangalile uyarchayaan. hesetta baankil ninnu maathram kaaryamaaya alavil meedhane anthareekshathilekku purathuvarunnillenkilum lokamembaadumulla samudranirappil ninnu anthareekshathilekku meedhane puranthallunnathu aagola meedhane bajattinte <aii. dii. 1> aanu.
bhookamba pravachanam.
bhookambathinu munbum sheshavum meedhane chorchakalil ninnulla vathaka udvamanathile vyathyasam alakkaan californiayudeyum greasinteyum theerathe pokkmaarkkukal padichittundu. 1980lum 1993lum shekharicha thelivukal kaanikkunnath bhookambathinu manikkoorukalkk munbum sheshavum ozhukkil ninnulla vathaka udvamanathil ganyamaaya vardhanavundaayi ennaanu. vathaka udvamanathinte edavelakalil pokmaarkkukalkku chuttumulla jalathinte thaapanila 5 digri selshyas vare vardhichu. eee nireekshanangal soochippikkunnathu bhookambangalkku munbum sheshavum pokkmaarkkukal hyper active aakunnu, ithu bhookambangal undaakunnathin munbu pravachikkaan sahaayikkunnathin vathaka udvamanam oru anuyojyamaaya maanadandamaakkunnu.
hypoxia.
thuranna theerathe uyarnna pradeshangalile hypoxyayude saannidhyam bhookhanda alamaarakalilekku oo2-yude kuravum poshakasamriddhavumaaya aazhathilulla vellam athikkunnathine niyanthrikkunna samudra saahacharyangale prathifalippikkunnu. hesetta baank complexinte abhayam nalkunna pradeshathe midu-shelf sthaanam valia shelf veethiyum durbalamaaya pravaahangalum uyarnna uthppaadanakshamathayum kaaranam oo2-yude kuravu ulla sambhavangalkk prathyekichum durbalamaanu. 2002 joolaiyil nadatthiya oru sarveyil, origon department oof fish aandu wildlife hesetta baankile saadhaarana uthppaadanakshamamaaya malsya aavaasavyavasthayil chattha malsyangalum akasherukkalum maathrame kandethiyulloo. newportinum hesetta headin idayil 700 chathurashra kilometeriladhikam vyaapichukidakkunna hypoxic allengil oo2-kuravu mekhalayaanu malsyathinteyum akasherukkalude maranathinum kaaranamenn vishwasikkappedunnu. 2002 muthal, venalkkaalath origon theeradesha shelf mekhalayil 820 chathurashra kilometeriladhikam visthruthiyulla seasonal hypoxia ellah varshavum nireekshikkappedunnu. venalkkaalath, hesetta head lainile (yathaakramam 44.0 enn) thaazhathe jalam sthiramaayi hypoxic aayirunnu, allengil oo 2 nte 43-64 micromolarinu (micrometer) idayil veezhunnu enna vasthuthayilekku alinja ooksijante (doow) saambilukal viral choondunnu. 2006 ll, oorigoonile aantharika shelfill anoxia aadyamaayi nireekshikkappettu. 2006 augustil, central origon theera traansekt lainukalile sarvekal paarakkettukalil ninnu ellah malsyangaludeyum poornnamaaya abhavam velippeduthi. uparithala jalathile saraashariyekkaal uyarnna praadhamika ulppaadanathe thudarnnu uyarnna poshakamulla thaazhnna jalavum uyarnna poshakamulla thaazhathe jalavum shwasanavumaayi samyojippichukondu kuranja ooo2 kadaltheera chalanamaanu kuranja ooo2 avasthakalkku kaaranam. praadhamika uthppaadanam vardhippikkunnathinupe, thaazhathe athirthi jalam shelfiloode theerathekku kadannupokunnathinaal shwasanam oo2 kammi kooduthal vashalaakkum.
chlorophyll eiii (cl-eiii).
hesetta baank mekhalayile chlorophyll eiii (cl-eiii) saandrata chuttumulla shelfinekkaal sthiramaayi kooduthalaanu. haloclinil ninnu poshakasamriddhamaaya vellam puranthallappettathinte falamaanu eee uyarnna moolyangal. vasanthakaalath, oru theeradesha uyarnna pradeshathulla jettu hesetta baankinte theerathu sthithicheyyukayum venalkkaalath kadaltheerathekku neengukayum cheiyunnu. praadhamika ulppaadanathile vardhanavum jalanirappil vardhanavum benthik shwasanavumaanu origonil ninnulla sub artic jalathinte adhiniveshathinte rund pettennulla anantharafalangal. baankile kuranja thapanilayudeyum uyarnna (cl-eiii) saandrathayudeyum upagraha chithrangal soochippikkunnathu chuttumulla shelfumaayi thaarathamyappeduthumbol hesetta baankil uyarchayum uthppaadanakshamathayum vardhikkunnu ennaanu. 2003 joolaiyil hesetta head lainile oru inshore shelf steshanil ninnu 43 milligram/lii enna uyarnna (cl-eiii) moolyangal nerittu sample cheythu.
naitrajan.
vaayurahithamaya shwasana roopangalaaya denitrification, ooo2 ennathinekkaal naitrettu upayogikkunnu. california karant sisttathile shelf avashishtangalil denitrification prathyekichum pradhaanamaanennu thonnunnu, kaaranam venalkkaalath uyarnnuvarunna seasonal hypoxic adibhaagam kaaranam. koodaathe, hesetta theerapradeshathe bakteeriyakalude denitrification rockfish mattu demersal malsya enangalum polulla mattu jeevikalkk upayogikkaan oo 2 swathanthramaakkunnu.
jaiva samudrashaasthram.
malsyangalude vaividhyam.
eee pradeshathu vasikkunna malsya enangalekkurichu padikkunnathinaayi 1968num 1970num idayil ombathu kappalukalil motham 105 troll settukal nirmmichu. 74 muthal 195 meter vare aazhamulla ezhu steshanukalil ninnaan eee saambilukal shekharichathu. ettavum samriddhamaaya enangal pattika 1 ll avatharippichittundu.
aazhamillaatha pradeshangalil ettavum samriddhamaaya inam pasaphik sandbaanu, athesamayam aazhameriya pradeshangalil nerttha all aanu ettavum samriddham. aazhameriya pradeshangalil 34-35 speesheesukalum idatharam pradeshangalil 24-25 speesheesukalum aazhamillaatha pradeshangalil 19 speesheesukalum padanangal kandethiyittundu. koodaathe, shaannan diversity indux (echu) 0.7 num 2.5 num idayil vyathyaasappedunnu, ithu vyathyastha aazhathilulla (aazhameriya pradeshangalil kooduthal) speesheesukalude ennathinte athe paatten kaanikkunnu. biomassinte kaaryatthil, benthik malsyathinte kanakkukal 0.9 muthal 2.4 gram/meter vare vyathyaasappedunnu. speesheesukalude sambannathayum echu moolyangalum vyathyastha akshaamshangalile mattu mitasheetoshna, demersal malsya samoohangalumaayi saamyamullathaan.
speeshees asamblisukalile dainamdina vyathiyanathekkurichum hesetta baankile malsyangalile samriddhamaaya paattenukalekkurichum gaveshanam nadathiyittundu. speesheesukal, aazham, aavaasavyavastha ennivayil savisheshamaaya samriddhiyilum pravartthanatthilum chila pothuvaaya pravanathakalundu. udaaharanathinu, pigmi rockfish pugettu soundu rockfish dhaaraalam pakal-ratri mattangalulla enangalaanu.
chila speesheesukalkk prathyeka tharatthilulla substrateukalil vasikkaan uyarnna aduppamundu. "sebaasts" ezz. pii. pii.pimmy rockfish manja wall rockfish ulppede, paarakkettukalil kaanapedunnu, pakshe avaa cheliyil mikkavarum kaanapedunnilla. maruvashathu, short spine thornihead, dover soul, rex soul enniva kooduthalum cheli substratilaanu kaanappedunnath, paarakkettukalude chuttupaadukalil iva mikkavarum kaanapedunnilla.
regional ooshyan modeling sisttam (roams) upayogichulla simuleshan padanangal kaanikkunnath hesetta baank sthirathaamasamaakkiya malsya laarvakalude uravidavum lakshyasthaanavum enna nilayil uyarnna saadhyathayulla pradesamaanu, ithu athinte sankeernamaaya bathimetry topography moolamaanu. eee pradeshathu, isobath ozhukkinteyum cross isobathinteyum ozhukkinte parivartthanangal laarvakale hesetta theeratthinte thekk bhaagathulla theerathekku bhooprakrithiyude rooparekha pinthudarukayum oduvil karayude thekk bhaagathekku thekkott ozhukukayum cheiyunnu. koodaathe, eee pradeshathekku vittayachaal larvakalkku athijeevana nirakk kooduthalaanennu modalukal theliyichittundu, ithu malsyangalude vijayakaramaya recruitmentinu hesetta baankinte praadhaanyam eduthukaanikkunnu.
macroenvertibrates vaividhyam.
1988 muthal 1990 vare ellah varshavum septambar maasathil nadatthiya oru padanatthil hesetta baankile macroenvertibrate samoohathe savisheshamaayi chithreekarichu. 67 muthal 360 meter vare aazhamulla aarr steshanukalilaayi 42 dives eee patanam nadatthi. pattika 2, samriddhiyude adisthaanathil, thiricharinja ettavum pradhanappetta enangale kaanikkunnu.
basket nakshathrangal aazhamillaatha paarakkettukalilum valia paarakkettukalilum aadhipathyam pulartthunnu, crinoidukalum rosthone madhya-aazhathilulla paarakkallukalil aadhipathyam pulartthunnu, crinoidukalum pottuna nakshathrangalum aazhathilulla kothukukalil aadhipathyam pulartthunnu, durbalamaaya kadal archinukal aazhathilulla cheli charivil aadhipathyam pulartthunnu.
malsyabandhanam.
(eiii) chila inam flaattfishukal, rockfishukal, sablefishukal ennivaykkulla demezhsal troll malsyabandhanam; (bii) rockfishukalkkum pasaphik hackin vendiyulla midu vaattar troll malsyabandhanam; (sii) rockfishukal, sablefishukal, pasaphik halibut ennivaykkulla longline malsyabandhanam; (4) rokkfishukalkkulla lamba longline malsyabandhanam; (iii) pradhaanamaayum uyarnna pradeshangalile malsyabandhana velakalil saalman malsyabandhanam ennivayaanu baankinte pradhana malsyabandhanam. 1980kalilum 1990kalilum eee stokkukalil chilath biomassil idivu nerittu, avaa kaaliforniyayude vaidyuthadhaarayude uthppaadanakshamathayile vyathiyaanangalum uyarnna vilaveduppu nilavaravum moolamaanu uthppaadippikkappettath. prathyekichum, chila paaramathsyangal 1990-kalil uyarnna idivu kaanichu, kaaranam avaa amita malsyabandhanathinu kooduthal irayaakunna jeevithacharithra savisheshathakal kaaranam. 2002 aayappozhekkum yuu enna ezhu enangal.ezz. padinjaaran theerathe rockfishukalum lingcode, pasaphik hake allengil vaitting ennivayum amithamaayi malsyabandhanam nadathiyathaayi audyogikamaayi prakhyaapichu. 2006 aayappozhekkum lingkode hack maathramaan veendeduthathu.
18 muthal 1280 meter vare aazhamillaatha aazhathil ninnu groundfish troll malsyabandhanam pravartthikkaam. federal niyantrithamaaya eee malsyabandhanathil saadhaaranayaayi kaanadayil ninnu meksikkan athirthikalilekkulla malsyabandhana kappalukal adangiyirikkunnu. eee mathsyabandhanathinte bhooribhaagavum mriduvaayathum kuranja aashwaasamullathumaaya adithattilaanu (udha.jii.manal allengil cheli). 2011 nuu munbu, eee malsyabandhanam sanjitha landing paridhiyilaan pravarthichathu. 2011 nuu sesham, ithu oru vyakthigatha malsyabandhana kwata (aii. eph. kyu) malsyabandhanamaayi maari, athaayath oru udamaykku vaarshika motham anuvadaneeyamaaya mathsyabandhanathinte oru bhaagathinu kwattayundu, koodaathe oro inathinum speeshees groupinum oru kwata undaayirikkanam.
hotspot.
vadakkan kaaliforniyayile jaiva pindatthinteyum nektan speesheesukaludeyum vaividhyathinte kaaryatthil hesetta baank oru sthiramaaya jaiva hotspottayi kanakkaakkappedunnu. eee savisheshathaye prerippikkunna ettavum pradhanappetta paaristhithika maanadandangal samudra-uparithala thaapanila, lavanathvam, saandrata ennivayaanu, ithu hotspottinte samvidaanangal pradeshathiloodeyulla ozhukkumaayum vyathyasthamaaya rakthachamkramana reethikalumaayum bandhappettirikkunnave soochippikkunnu. ithinupurame, irayude uyarnna samriddhiyum (udha.jii.euphousids) nektan speesheesukalude uyarnna saandrathaye anukoolikkunnu, prathyekichu uyarnna trophic thalangalil (udha.jii.thimingalangal). eee hotspottinte saamoohika ghadana kaalakramena vyathyaasappedunnu, athaayath vyathyastha enangal vyathyastha seasonukalilum varshangalilum samoohathe roopappeduthunnu, ithu eee hotspottinte sthirathayude oru pradhana kaaranam koodiyaanu. eee avasana pooyint ardhamaakkunnathu eee mekhalayile uyarnna biomass, nektan vaividhyathil speesheesukalum avayude pravarthanaparamaaya aavarthanavum thammilulla bandhangal pradhana gadakangalaanu. maruvashathu, malsya laarvakalil malsaravum vettayum kaaranam jellifish nektan enangalil prathikoola phalangal undaakkunnuvenn padanangal theliyichittundu.