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首页> 外文期刊>Journal of Natural History: An International Journal of Systematics and General Biology >Prawn larvae of Macrobrachium amazonicum (Decapoda, Palaemonidae) in contaminated oligohaline creeks on the Amazon estuary
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Prawn larvae of Macrobrachium amazonicum (Decapoda, Palaemonidae) in contaminated oligohaline creeks on the Amazon estuary

机译：大鼠大虾幼虫（大虾羚羊羚（Codapoda，Palaemonidae）在亚马逊河口的受污染的寡酒河里

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The objective of this study was to assess larval stage densities of Macrobrachium amazonicum in two highly contaminated amazonian creeks (Tucunduba and Mata Fome) and in one creek less impacted by human activities (Combu). The hypothesis tested is that larvae are more abundant in protected areas, independently of their development stage. Zooplankton was collected once every 3 months by conducting horizontal hauls at the sub-surface of the water column using a 300 mu m mesh size plankton net during flood and ebb tides. Temperature, pH, conductivity, salinity, dissolved oxygen, water hardness, biochemical oxygen demand, chemical oxygen demand, Cl, N-NO, NO, NH3, NH4, PO4, SO4, Fe, Mg, Li, K and Na values or concentrations were estimated for each creek in order to determine whether these factors influence larval stage densities. Zoea stages I, V, VIII, X and XI were recorded: zoea stage I was present all along Combu creek and downstream of Tucunduba and Mata Fome creeks; the other stages were encountered only in the uncontaminated creek. Larval stage zoea XI was considered 'occasional'. Densities were statistically different between months. It was concluded that spawning ground of M. amazonicum was close to the three creeks because the first larval stage was found indiscriminately at all downstream sampling stations. The more advanced stages (zoea V or higher) were found mid-downstream but only in the most preserved creek (Combu); no other larval stage beside zoea I was encountered in the creeks with greater anthropic influence. Further, not only is the adult population affected by water contamination, but also the occurrence of larval stages is associated with more protected waters. The high concentration of coliforms was associated with nitrates, and the low larval density of the Amazonian prawn was a clear response to this contamination of the water.
机译：本研究的目的是评估两次受污染的亚马逊小溪（Tucunduba和Mata Fome）的大鼠羚羊的幼虫阶段密度，并在人类活动（Combu）影响的一条小溪中。假设检测的是，幼虫在受保护区更丰富，独立于其发展阶段。通过在洪水和退潮期间使用300 mu M网格尺寸的浮游生物，通过在水柱的子表面进行水平运输，每3个月收集一次浮游动物。温度，pH，电导率，盐度，溶解氧，水硬度，生化需氧量，化学需氧量，Cl，N-NO，NO，NH3，NH4，PO4，SO4，Fe，Mg，Li，K和Na值或浓度估计每个小溪，以确定这些因素是否会影响幼虫阶段的密度。 Zoea阶段I，V，VIII，X和XI被记录：Zoea阶段我在Combu Creek和Tucunduba和Mata Fome Creeks的下游出现了;其他阶段只遇到在未污染的小溪中。幼虫阶段Zoea Xi被认为是“偶然”。密度在几个月之间存在统计学意义。得出结论，amaxonicum的产卵地接近三个小溪，因为在所有下游采样站都是不生种的第一个幼虫阶段。下游中下游的更高阶段（Zoea V或更高），但仅在最保存的小溪（Combu）中;除了Zoea旁边的其他幼虫阶段，在小溪中遇到了更大的人类影响。此外，不仅是受水污染影响的成年人口，而且还与幼虫阶段的发生与更受保护的水域有关。高浓度的大肠菌体与硝酸盐有关，亚马逊虾的低幼虫密度是对水污染的污染的明显反应。

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