themrtheastemJapanSeaoffHOlKMid⑪,ｎｍｔｈＪａｐⅢ duringR・ＹｎＪ"sej-〃〃〃ＣｒｕｉｓｅＫＴⅢ-二OinthesOuthwestemOkhotskSeaⅢd

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日本海域研究，第３９号，３１－４８ページ，２００８

PreliminaryrepOrtⅢmodemOstracOdsinsurfncesedimentsamplescollected duringR・ＹｎＪ"sej-〃〃〃ＣｒｕｉｓｅＫＴⅢ-二OinthesOuthwestemOkhotskSeaⅢd themrtheastemJapanSeaoffHOlKMid⑪,ｎｍｔｈＪａｐⅢ

HirokazuOzawalandShiIljiTmkawaki2

Abstract

Westudiedthespeciesdistributionsofmodernostracods(Crustracea）fTomthecontinentalshelfandslopeareasofthe southwesternOkhotskSeaandthenortheasternJapanSeaoffHokkaido,northJapan,betweenapproximately41-45oNbyexamining 28of45surfacesedimentsamplescollectedffomSeptemberl3-l8,2004,duringcruiseKTO4-20oftheR・Ｖ７ＺＪ"sej-mα/ｗ・Intotal，

l36speciesfiPom62generawereideｎｔｉｆｉｅｄ

Ｉｎ９ｏｆｔｈｅｌ２ｓａｍｐｌｅｓｆＴｏｍｔｈesouthwesternOkhotskSeaofTtheShiretokoPeninsulaatdepthsof76mｔｏ１，２３４，，７５ speciesof37generawerefbundHere,wedescribetheidentifiedspeciesandpresentscanningelectronmicroscope(SEM)images ofdominantandcommonspecies・Thisisthesecondreporttopresentdetaileddataontheostracodfaunaandtheirdistributionsin theOkhotskSea,whichdemonstratesthatsomespeciesarecommoninboththesouthwesternOkhotskSeaandtheJapanSea・

SixteensamplesfiPomthenortheastemJapanSeaofTOkushiriIsland，obtainedfromdepthsof65-375m，containedll5 speciesof56genera・ThisassemblageconsistedofmanyspeciestypicaloftheJapanSeaCentralWaterassemblageandtheJapan Sealntennediate-ProperWaterassemblage,ｄｅfinedbyOzawa(2003)．

Thebasicdatareportedherearesignificantfbrpaleobiogeographicandpaleoenvironmentalsmdiesinandaroundthe mid-latimdeJapanSea,whichexperiencedglobalclimaticchangesduringthelateCenozoicTheycanalsohelpclarifythe migrationandsurvival-extinctionpatternsofcryophilicorganismsduringHucmationsinmarineenvironments,suchasthosecaused byglobalwanningorcooling,notonlyinthepastbutalsointhepresentandnearfilmre．

Keywords:ostracodMrustacea,cryophilicspecies,offHokkaido,OkhotskSea,JapanSea,ＣＯntinentalshelfcontinentalslope，

speciesdistribution

ＬＩＮＴＲＯＤＵＣＴＩＯＮｌｏｃａｔｅｄｉｎｔｈｅｍｉｄ－ｌａｔｉｔｕｄｅｓ，ａｎｄａｒｅｔｈｕｓｐａｒｔｉｃｕｌａｒｌｙ

ｓｕｉｔｅｄｔｏｓｕｃｈｒｅｓｅａｒｃｈＯｃｅａｎｉｃｃｏｎｄｉｔｉｏｎｓｉｎｔｈｅｓｅａｒｅａｓｆｒｏｍｔｈｅＰｌｅｉｓｔｏｃｅｎｅｔｈｒｏｕｇｈｔｈｅＨｏｌｏｃｅｎｅｗｏｕｌｄｈａｖｅｂｅｅｎｓｕｓｃｅｐｔｉｂｌｅｔｏｇｌａｃｉｏ－ｅｕｓｔａｔｉｃｓｅａ－ｌｅｖｅｌｆｌｕｃｔｕａｔｉｏｎｓｌｉｎｋｅｄｔｏｃlimaticoscillations (e９．，Tada，1994)．However，ｆｅｗｓｔｕｄｉｅｓｈａｖｅｃｏｍｐａｒｅｄｔｈｅｄｉｓｔｒｉｂｕｔｉｏｎｓｏｆａｎｃｉｅｎｔａｎｄｍｏｄｅｒｎｓｐｅｃｉｅｓｉｎａｎｄａｒｏｕｎｄｔｈｅｓｅａｒｅａｓ・ ^Benthic ostracods（Crustacea）ａｒｅａｂｕｎｄａｎｔｉｎｂｏｔｈｌａｔｅＣｅｎｏｚｏｉｃａｎｄｍｏｄｅｒｎｃｏａｓｔａｌｓｅｄｉｍｅｎｔｓ，ｅｓｐｅｃｉａｌｌｙｔｈｏｓｅｆｒｏｍｔｈｅＪａｐａｎＳｅａ，ｍａｋｉｎｇｔｈｅｍａｐｐｒｏｐｒｉａｔｅｆｏｒｓｔｕｄｙ（e､9.,ＯｚａｗａａｎｄＫａｍｉｙａ，2001,2005a；

Ozawa,2003a；ＯｚａｗａｅｊａＬ，2004a)．

ＳｔｕｄｉｅｓｏｆｔｈｅｇｅｏｇｒａｐｈｉｃａｌｄｉｓｔｒｉｂｕｔｉｏｎｏｆｍａｒｉｎｅｏｒｇａｎｉｓｍｓｄｕｒｉｎｇｔｈｅｃｌｉｍａｔｅｆｌｕｃｔｕａｔｉｏｎｓｏｆｔｈｅｌａｔｅＣｅｎｏｚｏｉｃｈａｖｅｐｒｏｖｉｄｅｄｋｅｙｉｎｓｉｇｈｔsinto possiblenear-filtureresｐｏｎｓｅｓｏｆｍａｒｉｎｅｓｐｅｃｉｅｓｔｏａｎｔｈｒｏｐogenicclimatechange（e､９，Cronin，1999)．

Ｗｉｔｈｉｎｔｈｅｓｅｓｔｕｄｉｅｓ，ｉｎｖｅｓｔｉｇａｔｉｏｎｓｏｆｔｈｅｍｉｇｒａｔｉｏｎｓｏｆｃｒｙｏｐｈｉｌｉｃｓｐｅｃｉｅｓｉｎｒｅｓｐｏｎｓｅｔｏｃｌｉｍａｔｅｗａｒｍｉｎｇｈａｖｅｐｒｏｖｅｄｅｓｐｅｃｉａｌｌｙｖａｌｕａｂｌｅｔｏｅｓｔｉｍａｔｅｔｈｅｒｅｓｐｏnｓｅｔｏｔｈｅｃｈａｎｇｅ（e､9.,Ｒｏｙｅｍ/､，１９９５)．ＴｈｅｓｏｕｔｈｗｅｓｔｅｒｎＯｋｈｏｔｓｋＳｅａａｎｄｎｏｒｔｈｗｅｓｔｅｒｎＪａｐａｎＳｅａａｒｏｕｎｄＪａｐａｎ，ｓｎｏｒｔｈｅｒｎｉｓｌａｎｄｏｆＨｏｋｋａｉｄｏａｒｅ

IDepartmentofGeology,NationalScienceMuseum,Tokyo,3-23-lHyakunin-cho,Shinjuku-ku,Tokyol69-OO73Japan ｚＥｃｏ－ＴｅｃｈｎｏｌｏｇｙＤｉｖｉｓｉｏｎ，ＩｎｓｔｉｔｕｔｅｏｆＮａｔｕｒｅａｎｄＥｎｖｉｒｏｎｍｅｎｔａｌＴｅｃｈｎｏｌｏｇｙ，ＫａｎａｚａｗａＵｎｉｖｅｒｓｉｔｙ，Ｋａｋｕｍａ－ｍａｃｈｉ，

Ｋａｎａｚａｗａ９２０－１１９２Ｊａｐａｎ

３１

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Currently，ｗｅｈａｖｅｏｎｌｙｆｒａｇｍｅｎｔａｒｙｉｎｆＯｒｍａｔｉｏｎｏｎｔｈｅｄｉｓｔｒｉｂｕｔｉｏｎｏｆｍｏｄｅｒｎｏｓｔｒａｃｏｄｓｉｎｔｈｅｓｏｕｔｈｗｅｓｔｅｍＯｋｈｏｔｓｋＳｅａ．ＧｅｎｅｒａｔｈａｔｈａｖｅｂｅｅｎｉｄｅｎｔｉｆｉｅｄａｎｄｄｅｓｃｒｉｂｅｄｉｎｃｌｕｄｅＳｃ〃jzocyrhere (Hanai，１９７０;TsukagoshiandBriggs，１９９８)，Cyrhere (Tsukagoshi，1988)，Ｂ`Iﾉｳ/ii"jcy/ｈｅ７ｅ（Irizuki，1996）

andXesro/e6erjs（SatoandKamiya，2007)；some specieshavebeenidentifiedaＳｗｅｌｌ（Ikeyaand Cronin，1993；Itoh，１９９６)．ＡｎｅａｒｌｉｅｒｃｒｕｉｓｅＫＴＯ１－１４ｏｆｔｈｅＲ.Ｖ・Ｔｂ"Ｓｃﾉｰ"α/walsoproduceda detailedostracodｓｐｅｃｉｅｓｌｉｓｔａｎｄＳＥＭｉｍａｇｅｓｆｏｒｔｈｅＯkhotskSeafbrthefirsttime（Ozawa，2004；Ozawa erα/､，2004b)．However，overalLwehavelittle informationｏｎｓｐｅｃｉｅｓｏｃｃｕｒｒｅｎｃｅｉｎｔｈｉｓｓｅａ・

Ｉｎｃｏｎｔｒａｓｔ，ｒｅｃｅｎｔｓｔｕｄｉｅｓｈａｖｅｅｘｐａｎｄｅｄｔｈｅ speciesｌｉｓｔｓｏｆｔｈｅｍｏｄｅｒｎｏｓｔｒａｃｏｄｆａｕｎａｆｒｏｍｂｏｔｈｔｈｅｃｏｎｔｉｎｅｎｔａｌｓｈｅｌｆａｎｄｔｈｅｕｐｐｅｒｐａｒｔｏｆｔｈｅｃｏｎｔｉｎｅｎｔａｌｓｌｏｐｅｏｆｔｈｅｎｏｒｔｈｅａｓｔｅｒｎＪａｐａｎＳｅａｏｆｆ

Hokkaido（Itoh，1996；ＯｚａｗａｅｒａＬ，1999,2004b；

TsukawakieraL，2001；Ozawa，2004)．Thesestudies havedetailedthedisｔｒｉｂｕｔｉｏｎｓｏｆｏｓｔｒａｃｏｄｓｐｅｃｉｅｓａｎｄdemonstratedtherelationshipbetｗｅｅｎａｓｓｅｍｂｌａｇｅｓａｎｄｔｈｅｏｃｅａｎｉｃｅｎvironmentscreatedby water-masｓｓｔｒｕｃｔｕｒｅｓＡｒｅｃｅｎｔｓｔｕｄｙｂｙＯｚａｗａ (2003b）describedthedistributionofdomiｎａｎｔｓｐｅｃｉｅｓａｎｄａｓｓｅｍｂｌａｇｅｓｉｎｆｉｖｅａｒｅａｓｆｒｏｍｔｈｅｓｏｕｔｈｗｅｓｔｅｒｎｔｏｎｏｒｔｈｅａｓｔｅｒｎＪａｐａｎＳｅａＯｚａｗａ (2003b）describedtherelationshipsbetweenfauna andwater-massproperties，ｓｕｃｈａｓｗａｔｅｒｔｅｍｐｅｒａｔｕｒｅａｎｄｓａｌｉｎｉｔｙｉｎｓｕｍｍｅｒａｎｄｗｉｎｔｅｒ・Ｈｏｗｅｖｅｒ，little informationhasbeenobtainｅｄｆｒｏｍｓｌｏｐｅａｒｅａｓ，

ｅｓｐｅｃｉａｌｌｙｉｎｔｈｅｎｏｒｔｈｅａｓｔｒｅｇｉｏｎ・Ｃｏｎｓｅｑｕｅｎｔｌｙ，ｉｔｈａｓｂｅｅｎｄｉｆＴｉｃｕｌｔｔｏｃｏｍｐａｒｅｓｐｅｃｉｅｓｄｉｓｔｒｉｂｕｔｉｏｎｓｏｆ

ｔｈｅｓｏｕｔｈｗｅｓtｅｒｎＯｋｈｏｔｓｋＳｅａｗｉｔｈｔｈｏｓｅｏｆｔｈｅｎｏｒｔｈｅａｓｔｅｒｎＪａｐａｎＳｅａｉｎｓｌｏｐｅａｒｅａｓ．

Ｆｉｇ．１：ＳｕｂｍａｒｉｎｅｔｏｐｏｇｒａｐｈｙｏｆｓｔｕｄｉｅｄａｒｅａｓｉｎｓｏｕｔｈｗｅｓｔｅｒｎｐａｒｔｏｆＯｋｈｏｔｓｋＳｅａｏｆｆｎｏｒｔｈｅａｓｔＨｏｋｋａｉｄｏ（Ａ)，andnortheasternpartofJapanSeaoffsouthwestHokkaido（Ｂ)，basedonHydrographic Department,Ｍ・Ｓ.Ａ､，Ｊ叩aｎ（1980）ａｎｄＴｓｕｋｕｄａｅｒａﾉ.（1993）respectively．

3２－

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ＤｕｒｉｎｇｔｈｅＲ.Ｖ、ｎJ"ｓｅＪ－ｍａ７〃ＣｒｕｉｓｅＫＴＯ４－２０ｉｎ２００４，ｗｅｃｏｌｌｅｃｔｅｄｓｕｒｆａｃｅｓｅｄｉｍｅｎｔｇｒａｂｓａｍｐｌｅｓｆｒｏｍｂｏｔｈｓｈｅｌｆａｎｄｓｌｏｐｅａｒｅａｓｉｎｔｈｅｓｏｕｔｈｗｅｓｔｅｒｎＯｋｈｏｔｓｋＳｅａａｎｄｔｈｅｎｏｒｔｈｅａｓｔｅｒｎＪａｐａｎＳｅａｏｆｆＨｏｋｋａｉｄｏ，ｎｏｒｔｈＪａｐａｎｌｎｔｈｉｓａｒｔｉｃｌｅ，wedescribe theidentifiedostracoｄｓｐｅｃｉｅｓ，ａｎｄｐｒｅｓｅｎｔＳＥＭｉｍａｇｅｓｏｆｔｈｅｄｏｍｉｎａｎｔａｎｄｃｏｍｍｏｎｓｐｅｃｉｅｓＴｈｅｓｅｂａｓｉｃｄａｔａｗｉｌｌｂｅａｌｓｏｕｓｅｆＵｌｆorconsidering mid-latitudefauｎａｌｃｈａｎｇｅｓｂｏｔｈｉｎｔｈｅｇｅｏｌｏｇｉｃａｌｐａｓｔａｎｄｉｎｔｈｅｆｎｔｕｒｅ

study，ｂｕｔｗｉｌｌｂｅｔｈｅｆＯｃｕｓｏｆａｆｉｌｔｕｒｅｓｔｕｄｙ・Ｆｏｒｔｈｅｐｒｅｓｅｎｔｓｔｕｄｙ，ｗｅｅｘａｍｉｎｅｄａｔｏｔａｌｏｆ２８ｏｆｔｈｅ３４ｓａｍｐｌｅｓｃｏｌｌｅｃｔｅｄｏｆＴＳｈｉｒｅｔｏｋｏａｎｄＯｋushiri、

Afteridentificationoftheostracｏｄｓｐｅｃｉｅｓ，

ｔｈｅｎｕｍｂｅｒｓｏｆｉｎｄｉｖｉｄｕａｌｓｐｅｃｉｍｅｎｓｗｅｒｅｃｏｕｎｔｅｄｂｙｓｕｍｍｉｎｇｔｈｅｔｏｔａｌｎｕｍｂｅｒｏｆｓｉｎｇｌｅｌｅｆｔａｎｄｒｉｇｈｔｖａｌｖｅｓｔｈａｔｗｅｒｅｍｏｒｅｔｈａｎｈａｌｆｃｏｍｐｌｅｔｅａｎｄｔｈｅｎｕｍｂｅｒｏｆａｌｌｔｈｅｗｈｏｌｅｃａｒａｐacesTotalswere calculatedwithouｔｒｅｇａｒｄｔｏｓｅｘ，instarstage，ｏｒｔｈｅｅｘｉｓｔｅｎｃｅｏｆｓｏｆｔｐａｒｔｓ、Allmaterialshavebeen depositedaｔｔｈｅＤｅｐａｒｔｍｅｎｔｏｆＧｅｏｌｏｇｙ，ＮａｔｉｏｎａｌＳｃｉｅｎｃｅＭｕｓｅｕｍ，Ｊａｐａｎ

２．ＳＡＭＰＬＩＮＧＡＮＤＡＮＡＬＹＴＩＣＡＬＭＥＴＨＯＤＳ

Ｔｗｏｍａｒｇｉｎａｌａｒｅａｓａｔ４４－４５ｏＮｉｎｔｈｅｓｏｕｔｈｗｅｓｔｅｒｎＯｋｈｏｔｓｋＳｅａａｎｄ４０－４１ｏＮｉｎｔｈｅｎｏｒｔｈｅａｓｔｅｒｎＪａｐａｎＳｅａｗｅｒｅｉｎｖｅｓｔｉｇａｔｅｄＴｈｅｓｏｕｔｈｗｅｓｔｅｒｎＯｋｈｏｔｓｋＳｅａｓｉｔｅｓａｒｅｈｅｒeafterreferred toasbeingoffShirｅｔｏｋｏａｎｄａｒｏｕｎｄｔｈｅＫｉｔａｍｉ－ＹａｍａｔｏＢａｎｋ（Fig.１Ａ)；thenortheastern JapanSeasiteishereafterreferredtoasbeingoff Okushiri（Fig.１Ｂ)．SamplesｗｅｒｅｏｂｔａｉｎｅｄｆｒｏｍＳｅｐｔｅｍｂｅｒｌ３ｔｏｌ８，２００４，ｄｕｒｉｎｇＣｒｕｉｓｅＫＴＯ４－２０ｏｆｔｈｅＲ.Ｖ、ｎJ"ｓｅｊ－ｍα'ｗｏｆｔｈｅＪＡＭＳＴＥＣＪａｐａｎ・Ｗｅｃｏｌｌｅｃｔｅｄ４５ｓｕｒｆａｃｅｓｅｄｉｍｅｎｔｓａｍｐｌｅｓｉｎｔｏｔａｌｆｒｏｍｔｈｅｃｏｎｔｉｎｅｎｔａｌｓｈｅｌｆａｎｄｓｌｏｐｅ，ｕｓｉｎｇａｎＯｋｅａｎ－ｔｙｐｅｇｒａｂｓａｍｐｌｅｒduringthiscruise（Tableｌ)．ＩｎａｌＬｌ４ｓａｍｐｌｅｓｗｅｒｅｏｂｔａｉｎｅｄｏｆＴＳｈｉｒｅｔｏｋｏｆｒｏｍｄｅｐｔｈｓｏｆ７６－１，５００，，１１ｓａｍｐｌｅｓａｒｏｕｎｄＫｉｔａｍｉ－ＹａｍａｔｏＢａｎｋｆｒｏｍｄｅｐｔｈｓｏｆｌ５５－１，４９９ｍ，ａｎｄ２０ｓａｍｐｌｅｓｏｆｆＯｋｕｓｈｉｒｉｆｍｍｄｅｐｔhｓｏｆ６５－３７５ｍ（Fig.１；Tableｌ)．

Ｔｈｅｕｐｐｅｒ５ｍｍｏｆｓｕｒｆａｃｅｓｅｄｉｍｅｎｔｓｏｖｅｒａｎａｒｅａｏｆａｂｏｕｔ５０ｃｍｘ２５ｃｍ（ｆｂｒａｔｏｔａｌｏｆ６２５ｃｍ３）

ｗｅｒｅａｎａｌｙｚｅｄｆｂｒｏｓｔｒａｃｏｄｓ．NeutralizedlO％

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3．ＲＥＳＵＬＴＳ

Ａｔｏｔａｌｏｆｌ３５ｓｐｅｃｉｅｓｂｅｌｏｎｇｉｎｇｔｏ６２ｇｅｎｅｒａｗｅｒｅｉｄｅｎｔｉｆｉｅｄｆｒｏｍ２５ａｍｏｎｇ２８ｇｒａｂｓｕｒｆａｃｅｓａｍｐｌｅｓｆｒｏｍｔｗｏｓｅａａｒｅａｓ（Tables2and3；Platesl and2)．

ＳｏＭＭ'esr”〃ＯｊＭｏＭＳｅｄＭが肋かａＭｏ

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1Ａ)，collectedatdepthsbetween76mand1,234ｍａｌｏｎｇｏｎｅｓｕｒｖｅｙｌｉｎｅａｃｒｏｓｓｔｈｅｕｐｐｅｒｃｏｎｔｉｎｅｎｔａｌｓｈｅＩｆｔｏｔｈｅｍｉｄｄｌｅｓｌｏｐｅ，ｃｏｎｔａｉｎｅｄ７５ｓｐｅｃｉｅｓｂｅｌｏｎｇｉｎｇｔｏ３７ｇｅｎｅｒａ（Table２)．ＯｓｔｒａｃｏｄｓｗｅｒｅｎｏｔｆｏｕｎｄｉｎｓａｍｐｌｅｓＧ－１１，Ｇ-１２，ａｎｄＧ－１４・Ｔａｂｌｅ４１ｉｓｔｓｔｈｅ２０ｍｏｓｔａｂｕｎｄａｎｔｓｐｅｃｉｅｓａｓｗｅｌｌａｓｔｈｅｎｕｍｂｅｒｏｆｉｎｄｉｖｉｄｕａｌｓｆｒｏｍｅａｃｈｓｐｅｃｉｅｓａｎｄｔｈｅｉｒｐｅｒｃｅｎｔａｇｅｏｆｔｈｅｔｏｔａｌｐｏｐｕｌａｔｉｏｎ ^{Ｄｏｍｉｎａｎｔ} ｓｐｅｃｉｅｓ，ｄｅｆｉｎｅｄｈｅｒｅａｓｔｈｏｓｅｃｏｍｐｒｉｓｉｎｇｍｏｒｅｔｈａｎ 5％ｏｆｔｈｅｐｏｐｕｌａｔｉｏｎ，ｗｅｒｅＪｏル〃〃eαﾉe〃α〃oppore"sJs，

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Ｔｅｎｃｏｍｍｏｎｓｐｅｃｉｅｓ，ｄｅｆｉｎｅｄｈｅｒｅａｓｔｈｏｓｅｍａｋｉｎｇｕｐ２％ｔｏ５％ｏｆｔｈｅｔｏｔａｌｐｏｐｕｌａｔｉｏｎ，were LcJpero〃secyﾉﾉﾘｅｒｅ７ｏ６〃s/α，Ａ/８９ﾉﾉﾉoecjajojﾉα"ｍｅ〃SIS，

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3３－

(4)

Ｔａｂｌｅｌ：ＲｅｓｕｌｔｓｏｆｓａｍｐｌｉｎｇｏｎｔｈｅＲ｡Ｖ・ZHz〃sei-"、｢〃ＣｒｕｉｓｅＫＴＯ４－２０ｉｎｓｏｕｔｈｗｅｓｔｅｒｎｐａｒｔｏｆＯｋｈｏｔｓｋＳｅａａｎｄｎｏｒｔｈｅａｓｔｅｒｎｐａｒｔｏｆＪａｐａｎＳｅａ，ｏｆｆＨｏｋｋａｉｄｏ，ｎｏｒｔｈＪａｐａｎ．

１５７１４３３０２１

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13/09/04 13/09/04 13/0,/04 13/09/０４１３/09/0４

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15/09/０４１５/09/04 15/09/04 15/09/0４

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(5)

Ｔａｂｌｅ２：ＬｉｓｔｏｆｏｓｔｒａｃｏｄｓｐｅｃｉｅｓｆｒｏｍｓｕｒｆａｃｅｓｅｄｉｍｅｎｔｓｏｆｇｒａｂｓａｍｐｌｅｓｉｎｓｏｕｔｈｗｅｓｔｅｒｎＯｋｈｏＳｈｉｒｅｔｏｋｏＰｅｎｉｎｓｕｌａ．Ｎｕｍｅｒａｌｓｉｎｐａｒｅｎｔｈｅｓｅｓｉｎｄｉｃａｔｅｎｕｍｂｅｒｏｆｌｉｖｉｎｇｓｐｅｃｉｍｅｎｓ．

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