Detailed visual seabed survey at drilling site 7218/11-1
Detailed visual seabed survey at drilling site 7218/11-1
Detailed visual seabed survey at drilling site 7218/11-1
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List of figures and tables<br />
FIGURE1.EXPLORATIONWELL<strong>7218</strong>/<strong>11</strong>-1 (DARWIN) LOCATIONINTHEBARENTSEA(SOURCE<br />
: RENAS) ................................ ...5<br />
FIGURE2.ROVTRANSECTS ANDRECORDSOFSPONGESFOUNDATDARWINDURINGTHEBASELINESURVEYIN20<strong>11</strong>.THERELATIVE<br />
AMOUNTSOFTHEVARIOUSCATEGORIES OFSPONGEDENSITIESARESHOWNINTHEPIECHART. SEDIMENTSAMPLESWERETAKEN<br />
ATTHEREDDOTS(AXESCROSSES ).THESPUDLOCATIONISMARKEDWITHA BLUETRIANGLE(SEEARROW).FIGUREFROMDNV<br />
(20<strong>11</strong>)................................. ................................ ................................ ................................ ............................. 6<br />
FIGURE3.MSNJORDVIKING................................. ................................ ................................ ................................ ........8<br />
FIGURE4.MAGNUMROVSYSTEMUNDERDEPLOYMENTFROMNJORDVIKING. THEBLUECYLINDERATTHEBASEOFTHEROVISTHE<br />
HDSTILLCAMERA. PHOTOSABINECOCHRANE . ................................ ................................ ................................ .........9<br />
FIGURE5.INSTALLINGHDCAMERAONTHEMAGNUMROV.INCLUDEDTOGIVESCALETOTHEFIGUREABOVE. PHOTOSABINE<br />
COCHRANE . ................................ ................................ ................................ ................................ ........................9<br />
FIGURE6.PLANNEDSURVEYROUTEFORDETAILEDSITESURVEYATDARWIN, AUGUST2012................................. ....................<strong>11</strong><br />
FIGURE7.OVER4 TONNESOFSPONGES(PRESUMABLY ACCIDENTA LLY) COLLECTED INA TRAWLDURINGA RESEARCH EXPEDITIONTO<br />
THETROMSØFLAKET , NORTHERNORWAYIN2007.IMAGE: NORWEGIANRESEARCHINSTITUTE<br />
(HTTP:// WWW.IMR.NO/ TOKT/ TOKTOMTALER/ OKOSYSTEMTOKTET /TOKTDAGBOK _2007/DEKKET_FULLT_AV_SVAMP/ NB-NO).<br />
................................ ................................ ................................ ................................ ................................ ......14<br />
FIGURE8.GEODIASPONGEASSEMBL AGEIN THENORTHWESTATLANTIC. IMAGE: NORTHWESTATLANTICFISHERIESORGANISATION ).<br />
................................ ................................ ................................ ................................ ................................ ......14<br />
FIGURE9.GENERALDISTRIBUTIONOFHABITAT-FORMINGSPONGES INTHENEATLANTICANDNORDICSEASASINDICATEDBYRECORDS<br />
IN THEOSPAR[…]DATABASE . CONCENTRATION OFSPONGESVARYCONSIDERABL YWITHINTHESEAREAS........................... 15<br />
FIGURE10.BARENTSEA. SPONGEBYCATCHIN RESEARCHBOTTOMTRAWLING1982-97SUPERIMPOSED ONFISHING..................16<br />
FIGURE<strong>11</strong>.GENERALSTRUCTURE OFA HYPOTHETICAL SPONGE. FIGUREFROMUNIVERSITYOFBERKELEY<br />
(HTTP:// WWW.UCMP.BERKELEY .EDU/ PORIFERA / PORIFERAMM .HTML)................................. ................................ ........17<br />
FIGURE12.SCANNINGELECTRONMICROSCOPE (SEM)IMAGEOFSPONGESPICULES. IMAGEFROM<br />
HTTP:// WWW.UCMP.BERKELEY .EDU/ PORIFERA / PORSKEL .HTML................................. ................................ .................17<br />
FIGURE13.LEFT: UNIDENTIFIEDSPONGEFROMTHEDEEP-WATERLICENSEBØNNA, HOMETOAPOPULATIONOFGAMMARID<br />
CRUSTACEANS ANDRIGHT: AGEODIACOLONY, OFFERINGSUBSTRATE ANDSHELTERFOROTHERORGANISMS . PHOTOLEFT:<br />
AKVAPLAN-NIVA/OCEANEERING /ENIRIGHT: ILLUSTRATION PHOTOGRA PH, UNKNOWNLOCATION................................. .....18<br />
FIGURE14.PHOTOSFROMMERCIER(2012)SHOWING(LEFT) A SEA-PENFIELDAND(RIGHT) DEVELOPINGLARVAEOFTHEREDFISH<br />
SEBASTESTUCKEDAMONGTHEPOLYPSOFTHESEAPENS . SIZEOFTHESEAPENS ISNOTGIVEN, BUTTHESCALEBARS ONTHERIGHT<br />
AREBOTH1 MM. ................................ ................................ ................................ ................................ ...............20<br />
FIGURE15.ABUNDANCESCALEDEFINEDBYDNV,2008.UPPERLEFTRARE, UPPE RIGHT, SCATTERED , LOWERLEFT, REGULARAND<br />
LOWERRIGHT, HIGHDENSITY ................................. ................................ ................................ ............................... 21<br />
FIGURE16.IMAGEFROMSALINA, 2010,CLASSIFIED ASHAVINGA HIGHDENSITYOFSPONGES . THEGENERALSEAFLOORPICTUREIS<br />
SIMILARALSOFORBOTHDARWINANDJUKSA. ................................ ................................ ................................ .........22<br />
FIGURE17.IMPROVISEDCONCEPTUAL VISUALISATIONOFSPONGECOVERAGE , USEDINJULY, 2012................................ ...........23<br />
FIGURE18.MATHEMATICALLY CALCULATED%COVERSCHEMEADOPTEDBYPALERUDANDHANSENDURINGTHEPRESENTVISUAL<br />
SURVEYATDARWIN, AUGUST, 2012................................. ................................ ................................ ....................24<br />
FIGURE19.VISUALREPRESENTATION OFDEPTHSRECORDEDDURINGTHESURVEY , BASEDONTHESURVEYLOG. THEPLANNE DRILLING<br />
LOCATIONATDARWINISSHOWNBYA YELLOWSTAR................................. ................................ ................................ 25<br />
FIGURE20.ILLUSTRATIVE IMAGE SHOWINGTYPICALSEDIMENTCONDITIONSATTHEDARWINFIELD, AUGUST, 2012.PHOTOS:<br />
OCEANEERINGAS................................ ................................ ................................ ................................ .............26<br />
FIGURE21.OBSERVATIONOFMARINELITTER. PIECEOFSHAPEDMETALOFUNKNOWNORIGIN................................. .................26<br />
FIGURE22.VISUALOBSERVATIONS OFESTIMATEDSPONGEDENSITIES , DARWIN, AUGUST2012................................ ...............28<br />
FIGURE23.MAPILLUSTRATING THEDENSITYESTIMATION(%COVERAGESPONGES ) ONTHESEDIMENTSURFACE. SEEMETHODS<br />
SECTIONFORQUANTIFI CATIONMETHOD. BLACKCROSSES INDICATEOBSERVATIONS ; DATAAREINTERPOLATE DBETWEENPOINTS<br />
BYTHEKRIGINGMETHODINSURFERPROGRAMME . ................................ ................................ ................................ 29<br />
FIGURE24.LOCATIONOFTHE30IMAGE SELECTED FORFURTHERANALYSIS ................................. ................................ .........30<br />
FIGURE25.PHOTOSFROMSELECTED POSITIONS , ILLUSTRATING THECATEGORY0-1 %COVERAGE . DARWINFIELD, AUGUST2012..31<br />
FIGURE26.PHOTOSFROMSELECTED POSITIONSWITH0-1 %COVERAGEOFSPONGESATDARWINAUGUST2012.THESEIMAGES<br />
TAKENEARLYMORNING, WHENFISHBECAMEABUNDANT................................. ................................ .......................... 32<br />
FIGURE27.PHOTOSFROMSELECTED POSITIONS(SEEMAPINFIGUREX) WITH1-5 %COVERAGEOFSPONGESATDARWINAUGUST<br />
2012................................. ................................ ................................ ................................ ............................. 33<br />
FIGURE28.PHOTOSFROMSELECTED POSITIONSWITH1-5 %COVERAGEOFSPONGESATDARWINAUGUST2012.......................34<br />
FIGURE29.PHOTOSFROMSELECTEDPOSITIONSWITH5-10%COVERAGEOFSPONGESATDARWINAUGUST2012.....................35<br />
FIGURE30.VISUALREPRESENTATION OFFREQUENCIES OFSPONGEABUNDANCECLASSESACROSSTHESTUDYAREA. UPPER:<br />
HISTOGRAMSHOWINGACTUALNUMBERSOFOBSERVATIONSANDLOWER: PIECHARTEXPRESSING RELATIVEFREQUENCIES AS<br />
Akvaplan-niva AS, 9296 Tromsø<br />
2 www.akvaplan.niva.no
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