Species-specific house productivity of appendicularians
Species-specific house productivity of appendicularians
复制标题
阑尾动物的物种特异性房屋生产力
DOI：
10.3354/meps259163
复制
发表时间：
2003
影响因子：
2.5
通讯作者：
T. Ishimaru
中科院分区：
文献类型：
--
作者：
R. Sato;Yuji Tanaka;T. Ishimaru
阑尾动物是世界海洋中常见的远洋被囊动物，它们定期产生新的粘液屋并丢弃旧的粘液屋。废弃的房屋形成宏观聚集体，构成水柱中生物活动的场所，也有助于有机物向更深的水的运输。在本研究中，我们测量了在17 ~ 29°C的30 pm筛网海水中养殖的10种尾尾鱼的房屋更新率。同时测定了部分类被囊动物（C B）、新分泌屋（C NH）和废弃屋（C DH）的碳含量。在20°C条件下，白栎（Oikopleura cophocerca）的房屋更新率为2房屋d -1，而在23°C条件下，母贝母（贝母forica digitata）的房屋更新率为40房屋d -1。长尾棘球绦虫、fususiformis棘球绦虫、rufescens棘球绦虫和huxleyi棘球绦虫的nhh分别为0.16、0.48、1.6和8.8 pg，分别相当于cbb的5.3、9.2、14.1和10.3%；前3种的cdh分别为0.68、1.2和3.9 μg，分别占cbc的17.9%、30.0%和32.8%（赫胥雷属未测cdh）。随着C - NH /C - B比值的增加，各树种房屋更新率均呈下降趋势。计算结果表明，在23°C条件下，长尾草、梭梭草、粗尾草和huxleyi分别产生了相当于其生物量d -1的112%、217%、75%和89%的新屋，前3种物种分别丢弃了相当于其生物量d -1的380、708%和174%的屋。结果表明，3个物种的cnhh和cdh分别是成熟个体cb的1.1 ~ 3.6倍和2.7 ~ 12倍。这种高屋生产力，加上庞大的种群规模，表明尾虫是海洋生态系统中宏观聚集体的主要生产者。
Appendicularians, pelagic tunicates that are common in world oceans, periodically produce new mucus houses and discard old ones. Discarded houses form macroscopic aggregates that constitute sites of biological activity in the water column and also contribute to the transport of organic matter to deeper water. In this study, we measured the house renewal rates of 10 appendicularian species cultivated in 30 pm-mesh-screened seawater at 17 to 29°C. In addition, the carbon content of the tunicates (C B ), their newly secreted houses (C NH ) and their discarded houses (C DH ) were concurrently examined for some of the oikopleurid species. House renewal rates varied from 2 houses d -1 for Oikopleura cophocerca at 20°C to 40 houses d -1 for Fritillaria formica digitata at 23°C. The C NH of O. longicauda, O. fusiformis, O. rufescens and Megalocercus huxleyi were 0.16, 0.48, 1.6 and 8.8 pg, corresponding to 5.3, 9.2, 14.1 and 10.3 % of C B , respectively; the C DH of the first 3 species were 0.68, 1.2 and 3.9 μg, corresponding to 17.9, 30.0 and 32.8 % of C B , respectively (C DH was not measured in M. huxleyi). House renewal rates decreased with increasing C NH /C B ratios for all species. Our calculations indicate that at 23°C, populations of O. longicauda, O. fusiformis, O. rufescens and M. huxleyi produced new houses corresponding to 112, 217, 75 and 89% of their biomass d -1 , and that the first 3 species could discard houses corresponding to 380, 708 and 174 % of their biomass d -1 , respectively. The individual lifetime production of C NH and C DH for all 3 species was estimated to be 1.1 to 3.6 and 2.7 to 12 times greater than the C B of mature individuals. This high house-productivity, combined with large population sizes, indicates that appendicularians are major producers of macroscopic aggregates in marine ecosystems.