Relationship between distribution of Heteromastus, Mediomastus and Notomastus of Capitellidae of polychaete and bottom condition in the northern part of Ariake Sound [Japan]
2006
Niki, K.(National Fisheries Univ., Shimonoseki, Yamaguchi (Japan)) | ; Suyama, N. | ; Suda, Y. | ; Murai, T.
This study was carried out to clarify relationship between distribution of Heteromastus, Mediomastus and Notomastus of Capitellidae and bottom condition in the northern part of Ariake Sound. The bottom samples were collected periodically at 6 sampling stations from May 2002 to February 2003. Sediment characteristics such as AVS-S, I.L., mud content and Md phi were analyzed and Capitellidae in the mud samples were sorted and identified. Total number of individual Capitellidae collected at all stations in the whole period was 640. Heteromastus was the most abundant (54%), followed by Mediomastus (39%), Notomastus (6%) and others (1%). In relation to the bottom condition, many Mediomastus and Notomastus appeared in the sandy environment. While, majority of Heteromastus was collected in the sandy-muddy environment. However, almost no Capitellidae was detected in the muddy environment. These results indicate that Heteromastus prefer an environment having higher mud content and organic materials up to a certain levels compared with the other 2 genera. This study suggested that identification of Capitellidae even in the genus level could be useful for evaluation of bottom quality.
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