Habitat use by the gnathiid isopod Elaphognathia discolor living in terebellid polychaete tubes
Habitat use by the gnathiid isopod Elaphognathia discolor living in terebellid polychaete tubes
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生活在四毛类多毛类管中的颌类等足动物 Elaphognathia discolor 的栖息地利用
DOI：
10.1017/s0025315408000039
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发表时间：
2008
影响因子：
1.2
通讯作者：
E. Nishi
中科院分区：
文献类型：
--
作者：
Katsuhiko Tanaka;E. Nishi
研究了2003年6月至2004年4月在日本东北部静川湾采集的双月标本中，栖息于毛壳状多毛管的节肢等足目动物Elphognathia discolor的栖息地利用模式。共分离到9种多毛类，并在4种毛类的管内发现了多毛类。在松毛虫中，在每个样品中都采集到了细鳞烟叶蝉，而其他种类只是间歇性地采集到。变色棘球绦虫幼虫和成虫一年四季都在纤细支气管虫的管内活动，在样本中的流行率为57.1%~80.0%。在纤细管内发现了大量的幼虫阶段，包括第一期幼虫和早熟雌虫，这表明该种可能在整个幼虫期都利用纤细管进行休眠和蜕皮。成虫在管内的分布明显不同于随机分布。成年雄虫很少与其他雄虫在管子里共存，而几只幼虫和雌性经常生活在一起。在多毛管中成群的雌性雌虫通常只有一只雄虫参与，这与在其他雌虫中观察到的‘后宫’相似，这表明斑纹夜蛾的交配系统可归类为半产性后宫一夫多妻制。
The pattern of habitat utilization by Elaphognathia discolor, a gnathiid isopod inhabiting terebellid polychaete tubes, was examined in bimonthly samples taken between June 2003 and April 2004 from Shizugawa Bay, north-eastern Japan. Nine species of terebellid polychaetes were obtained, and gnathiids were found in tubes of four terebellid species. Of the terebellids, Nicolea gracilibranchis was collected in each sample, while the other species were obtained only intermittently. Both larval and adult E. discolor inhabited the tubes of N. gracilibranchis throughout the year, with their prevalence in samples ranging from 57.1 to 80.0%. A large range of larval stages was found within N. gracilibranchis tubes, including the first larval stage and premature females, suggesting that this gnathiid species may use N. gracilibranchis tubes for resting and moulting throughout the larval period. The distribution of adult gnathiids within tubes significantly differed from random. Adult males rarely coexisted with other males in tubes, while several larvae and females often lived together. Groups of female gnathiids in polychaete tubes were usually attended by a single male, resembling the ‘harems’ observed in other gnathiids and suggesting that the mating system of E. discolor can be classified as semelparous harem polygynandry.