Vertical distribution and migration of planktonic polychaete larvae in Onagawa Bay, north-eastern Japan

Q2 Agricultural and Biological Sciences

Memoirs of Museum Victoria Pub Date : 2014-01-01 DOI:10.24199/J.MMV.2014.71.01

H. Abe, W. Sato-Okoshi, G. Nishitani, Y. Endo

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引用次数: 5

Abstract

H.,�Sato-Okoshi,�W.,�Nishitani,�G.�andEndo,�Y.�2014.�Verticaldistributionandmigrationofplanktonicpolychaete� larvae in Onagawa Bay, north-eastern Japan. Memoirs of Museum Victoria�71:�1-9. The planktonic larvae of polychaetes are one of the most numerous and diverse groups in coastal zooplankton; however, little is known about their larval dynamics and the factors that affect their vertical distribution. We investigated the vertical distribution and migration of planktonic polychaete larvae in Onagawa Bay, north-eastern Japan, particularly focusingonthedominantspionidlarvae.�Intotal,�14�familiesofplanktonicpolychaetelarvaeand�14�speciesorgeneraof� spionidlarvaewereidentifiedduringourstudy.�Theirdensitygreatlyfluctuatedaccordingtoseasonanddepth,�withthe� polychaetelarvaegenerallydistributedinthelowerlayersofthewatercolumn.�Furthermore,�trendsinverticaldistribution� ofspionidlarvaevariedbetweenspecies.�Inwinterandspring,�larvaeofPolydora onagawaensis were the most prevalent, withawiderangeinverticaldistribution.�Insummerandautumn,�larvaeofPseudopolydora achaeta and Prionospio spp. were the most prevalent spionid larvae and were primarily distributed in the lower layers of the water column. Trends in larval vertical distribution varied as a result of differences in adult habitat; these variations would enable the larvae to efficientlyrecruitintotheirappropriateadulthabitats.�Spionidlarvaedidnotshowdielverticalmigration.�Larvaeoftwo� spionid taxa, Pseudopolydora achaeta and Prionospio spp., exhibited tidal vertical migration, with larvae appearing to avoiddispersalbymovingtoslower-flowingdeeperwaterduringfloodandebbtides.�Althoughmanypreviousstudies� assume that, because of their limited swimming capacity, polychaete larvae are passively dispersed within the water column, this study indicates that polychaete larvae can control their vertical distribution to some extent, and this small- scale vertical migration may be important as a retention mechanism for polychaete larvae.

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日本东北部女川湾浮游多毛类幼虫的垂直分布和迁移

�W。H。�Sato-Okoshi,�Nishitani, g��andEndo, y��2014。日本东北部女川湾浮游多毛类幼虫的垂直分布和迁徙。《维多利亚博物馆回忆录》71:1-9。多毛纲浮游幼体是沿海浮游动物中数量最多、种类最多的一类;然而，人们对其幼虫动态和影响其垂直分布的因素知之甚少。本文调查了日本东北部女川湾浮游多毛类幼虫的垂直分布和洄游，重点研究了占优势的多毛类幼虫。14�Intotal,��familiesofplanktonicpolychaetelarvaeand 14��speciesorgeneraof�spionidlarvaewereidentifiedduringourstudy。,�Theirdensitygreatlyfluctuatedaccordingtoseasonanddepth��polychaetelarvaegenerallydistributedinthelowerlayersofthewatercolumn。�此外,�trendsinverticaldistribution�ofspionidlarvaevariedbetweenspecies。冬春季节，多朵拉(polydora onagawaensis)幼虫分布最广，呈垂直分布。夏、秋两季，毛刺假polydora achaeta和Prionospio spp.的幼虫数量最多，主要分布在水柱的下层。幼虫垂直分布的趋势因成虫生境的不同而不同;这些变化将使幼虫能够有效地招募到它们合适的成年栖息地。两种蛛形纲的幼虫，假polydora achaeta和Prionospio spp，表现出潮汐垂直迁移，在洪水和潮汐期间，幼虫似乎通过移动到流速较慢的深水来避免分散。虽然以前的许多研究都认为，由于多毛体的游动能力有限，多毛体幼虫在水柱内被动分散，但本研究表明，多毛体幼虫可以在一定程度上控制其垂直分布，这种小规模的垂直迁移可能是多毛体幼虫的一种重要保留机制。

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来源期刊

Memoirs of Museum Victoria Agricultural and Biological Sciences-Agricultural and Biological Sciences (all)

CiteScore

1.10

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0.00%

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