First evidence of tumor-like anomaly infestation in Copepods from the Central
First evidence of tumor-like anomaly infestation in Copepods from the Central
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发表时间：
2008-09
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通讯作者：
C. Bhandare;Baban Shravan Ingole
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作者：
C. Bhandare;Baban Shravan Ingole
为了调查印度洋中型浮游动物的分布和丰度，沿着中印度海脊（CIR）从赤道水域到南纬60°CIR进行了浮游动物采样。在七个采样地点中，在 5 个地点观察到了诸如 Ellobiopsis sp（Protista，Ellobiopsidae）等体外寄生虫的包囊或肿瘤样异常（TLA），即 TLA。在 Stn 观察到 TLA 的最高频率。 MPN-03 在所有 3 个深度采样（0-500 In、500-1000 m 和 1000-1500 m）。所有桡足类样本中感染样本的频率从 3.0% 到 6.9% 不等。在受感染的属中，Oncaea sp（Copepoda：Poecillostomatoida）是最主要的，占21.2％，其次是Clallsocalanus sp（13.6％），Centropages sp（12.9％），Pleuromamma sp（9.4％）和Acrocalanus sp（7.8％）。观察到两种类型的肿瘤。 “A”型是拉长的，肿瘤中充满小颗粒结构，“B”型是球形，结构中很少或没有颗粒。 “B”型是最常见的，在频率方面占主导地位（96.60%），而“A”型则很少观察到，占寄生总数的 3.4%。根据 MPN 03 站记录的活跃热液矿化的物理化学异常特征，推测热液羽流喷发的高浓度潜在有毒化学物质导致 Oncaea 和其他桡足类物种的外骨骼减弱，使它们更容易受到寄生攻击，特别是像 E/lobiopsis sp. 这样的外寄生生物。这些体外寄生虫攻击宿主并以宿主的体液为食，这可能导致宿主死亡。这项研究强调了优势浮游桡足类（如 Oncaea）寄生虫感染对深海食物链的影响。
To investigate the distribution and abundance of mesozooplankton in the Indian Ocean, zooplankton sampling was conducted along the Central Indian Ridge (CIR) from the equatorial waters to goS latitude. Of the seven sampling locations, cysts or Tumor Like Anomalies (TLA) of ectoparasites like Ellobiopsis sp (Protista, Ellobiopsidae), being known as TLA were observed at the 5 locations. The highest frequency of TLA was observed at Stn. MPN-03 at all the 3 depths sampled (0-500 In, 500-1000 m and 1000-1500 m). Frequency of infected specimens among all the sampled copepods varied from 3.0 - 6.9%. Among the infected genera, Oncaea sp (Copepoda: Poecillostomatoida) was the most dominant accounting 21.2% followed by Clallsocalanus sp (13.6%), Centropages sp (12.9%), Pleuromamma sp (9.4%) and Acrocalanus sp (7.8%). Two types of tumors were observed. Type 'A' was elongated and full of small granular structures in the tumor and type 'B' was spherical with few or no granules in the structure. Type 'B' was the most common that dominated in terms of frequency (96.60%), where as type 'A' which was observed rarely, was in 3.4% or the total parasiti?ed population. Consequent to the physico-chemical anomalous signatures of active hydrothermal mineralisation recorded at station MPN 03, it is hypothesized that high levels of potentially toxic chemicals erupted from the hydrothermal plume caused the weakening of the exoskeleton of Oncaea and other copepod species, making them more susceptible to the parasitic attack, especially to ectoparasitcs like E/lobiopsis sp. These ectoparasites attack the host and feed on their body fluids which may lead to the death or the host. This study emphasis the consequences of parasitic infection in dominant planktonic copepods like Oncaea to' the deep-sea food chain.