Vertical distribution and life cycle of two free-ranging polychaetes on rocky intertidal shore
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- IWASAKI Keiji
- Institute for Natural Science, Nara University
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Abstract
The vertical distribution and life cycle of two free-ranging polychaetes, Arabella iricolor (Montagu) and Nereis nichollsi Kott, were studied on a rocky intertidal shore at Shirahama, Wakayama Prefecture, where two mussels, Septifer virgatus (Wiegmann) and Hormomya mutabilis (Gould), formed vertically contiguous beds. The abundances of both polychaetes increased downshore within the mussel beds. Multiple linear regression analyses against polychaete density revealed that only shore height tended to be negatively correlated for both species. Adult polychaetes with eggs or sperm in their coelom were collected from May to August for A, iricolor and from April to August for N. nichollsi. Newly settled juveniles (<0.5mm width) were found abundantly within algal turf formed in the gaps of the H. mutabilis bed in August and September for A. iricolor and in June to September for N. nichollsi. No large polychaetes (>2mm width) of both species were found within the algal turf throughout the year. Many small polychaetes of both species were collected in the H. mutabilis bed in August to December. The cohort increased in size but decreased in density towards the next summer in the mussel bed, and disappeared by October. It appears that both polychaetes have a longevity of one year and reproductive periods chiefly from May to August, followed by recruitment from June to September. Juveniles seem to settle exclusively into the algal turf and migrate with growth into the H. mutabilis bed and even the S. virgatus bed.
Journal
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- BENTHOS RESEARCH
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BENTHOS RESEARCH 52 (1), 47-60, 1997
JAPANESE ASSOCIATION OF BENTHOLOGY
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Details 詳細情報について
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- CRID
- 1573668924253274880
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- NII Article ID
- 10006907722
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- NII Book ID
- AN10565057
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- ISSN
- 02894548
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- Text Lang
- en
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- Data Source
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- CiNii Articles
