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To better understand the relationship between human-induced disturbance and the meiobenthic community in a harbor environment, sediment samples were collected at four stations (Sts. MP1 to 4) in Manazuru Port in Sagami Bay on eight occasions, approximately monthly between July, 2003, and March, 2004. Qualitative meiofaunal samples were collected by a simple cylindrical dredge. In addition, chloroplastic pigment equivalents (from October, 2003, to March, 2004), organic carbon and nitrogen content (in April and June, 2004), and grain size composition (in April, 2004) of the sediment were analyzed. Organic carbon and nitrogen were much higher at St. MP2 than at the other three stations. The sediment samples at St. MP2 frequently included dead fish and shellfish, evidently dumped from a nearby fish market. Station MP2 thus was subject to heavy organic loading. Multivariate community structure analyses using only higher taxonomic levels (phylum, order and/or class) of the meiobenthos did not show significant di#erences among the stations and sampling months. In contrast, based on species and feeding-types of nematodes, a distinct sample group form St. MP2 was revealed by multidimensional scaling (MDS) and cluster analyses. R-type analysis of the species association of dominant nematodes and correspondence analysis of dominant species and feeding-types of nematodes both also clearly showed the distinctness of the sample group from this station, which mainly consisted of facultative predators collected exclusively there. These results suggest that two species of facultative predators, Meyersia sp. and Metaparoncholaimus sp. belonging to the family Oncholaimidae, and four other nematode species are good indicators of a harbor environment a#ected by heavy organic loading. Key Words: community structure, feeding types, free-living nematodes, harbor environment, meiofauna, organic pollution (meiobenthos)GH I J 1,000K500 mm L MN 63K31 mm L OPQ PR ST OUVWRX N (Giere 1993)H C YZ[ \]H C^ _` ab 8 cd eGH fghijYk l m n oOpXH WP qgr Ys t uOpXH vw xy _ z {|X O}QPRX 8 ~H C XH 3  Y! "_` vw J_#WRX NH R P C b g UO ! $WRX 8 GH %&3J _ 22& '_d eP_NHWP H2 T O(pX) H ¡¢£\¤ ¥ *+ b ,¦§ O | ̈ ©aO PH C «. OpXy ¬WRX ­Giere 1993; /® 1998 ̄8 ppH G° ±S W '_0 e2b ¥H 3& ́μ ¶ ·* 0 e ̧x cU G 1&  oWR 8  ¥H »1_ !2 OpXH *0 e Received 5 June 2007 Accepted 21 Jan. 2008 Corresponding author E-mail: shimode@ori.u-tokyo.ac.jp Japanese Journal of Benthology 3 31⁄41⁄2 63: 11 22 (2008)

Potential Use of Meiobenthos and Free-living Nematodes for Sediment Quality Assessment in Manazuru Port, Sagami Bay, Japan