Biometry of the branchial plume in the hydrothermal vent tubeworm Riftia pachyptila (Vestimentifera; Annelida)
Biometry of the branchial plume in the hydrothermal vent tubeworm Riftia pachyptila (Vestimentifera; Annelida)
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DOI：
10.1139/z02-005
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发表时间：
2002-02-01
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影响因子：
--
通讯作者：
Lallier, FH
中科院分区：
文献类型：
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作者：
Andersen, AC;Jolivet, S;Lallier, FH
热液喷口管虫 Riftia pachyptila 的鳃羽是这种无口无肠管虫直接与其环境交换代谢物的主要器官。我们通过平面测量估计了每单位湿质量的总鳃表面积，称为比鳃表面积（SBSA）。蠕虫生长期间 SBSA 的变化是根据 16 条个体的湿重从 1 克到 112 克来推断的。 Riftia pachyptila的平均SBSA为22 cm(2).g(-1)，在所有水生动物中排名第二，相当于身体其他部分表面积的9倍。可以区分三个显着不同的 SBSA 类别，分别对应于小型、中型和大型个体。中小型R. pachyptila 的 SBSA 值是大型个体的两倍。鳃羽长度和躯干长度之间的负生长异速生长可能与SBSA的这种变化相关，在中小型群体中，羽羽比躯干生长得更快。在大型个体中，躯干长度超过羽毛长度，导致体重增加，从而降低 SBSA。然而，较低的 SBSA 并不意味着通过大型管虫羽流的代谢物扩散减少，因为它们较长的游离丝具有更发达的羽片，这可能是代谢物扩散的首选途径，因为最小跨上皮距离为 2 μm。
The branchial plume of the hydrothermal vent tubeworm Riftia pachyptila is the main organ by which this mouth- and gut-less tubeworm directly exchanges metabolites with its environment. We estimated the total branchial surface area per unit wet mass, termed the specific branchial surface area (SBSA), from planimetric measurements. Changes in the SBSA during the growth of the worm were inferred from 16 individuals ranging from 1 to 112 g wet mass. Riftia pachyptila has a mean SBSA of 22 cm(2).g(-1), the second highest among all aquatic animals, representing 9 times the surface area of the rest of the body. Three significantly different classes of SBSA could be distinguished, corresponding to small, medium-sized, and large individuals. The SBSA values for small and medium-sized R. pachyptila are twice that for large individuals. Negative growth allometry between the length of the branchial plume and that of the trunk may be correlated with this variation in SBSA, the plume growing faster than the trunk in the small and medium-sized groups. In large individuals the trunk length exceeds the plume length, inducing an increase in body mass that lowers the SBSA. However, a lower SBSA does not imply reduced metabolite diffusion through the plume of large tubeworms, since their longer free filaments bear more developed pinnules, which are probably the preferred pathway of metabolite diffusion, owing to a minimal transepithelial distance of 2 mum.