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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Are the diatoms Navicula sp. and Thalassiosira fluviatilis suitable to be fed to the benthic harpacticoid copepod Tisbe biminiensis?
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Are the diatoms Navicula sp. and Thalassiosira fluviatilis suitable to be fed to the benthic harpacticoid copepod Tisbe biminiensis?

机译：是硅藻Navicula sp。和适合于底栖类立足类co足类足纲Tisbe biminiensis的拟南芥（Thalasiosira fluviatilis）？

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The objective of this study was to compare the influence of the diets of two diatoms, Navicula sp. (benthic) and Thalassiosira fluviatilis (planctonic), on the development, fecundity and survival of the harpacticoid copepod Tisbe biminiensis. In order to determine the optimal concentration of food, 35 egg-bearing females were submitted to six algal concentrations and controls (without food). After 24 h, the content of the recipients was fixed with 4% formalin and then fecal pellets produced by each female were counted and measured. The larval development was studied by surveying 50 nauplii on each diet individually until the adult stage, at intervals of 6 h. The cast exoskeletons were removed to count the number of segments and for measurement. The fecundity was obtained counting the naupliar production every 48 h of groups containing 10 females in different algal concentrations in both diets. The diet influence on fecundity was tested by submitting four groups of 10 females fed on optimal algal concentrations based on the fecal pellet experiments. In the Navicula sp. concentration of 0.4 μg Chl-a/ml, considered to be optimal for fecal pellets production, the diatoms were shown toxic, resulting in a low survival rate and inhibiting the egg production of copepods. The optimal concentration considering fecundity was estimated to be 0.1 μg Chl-a/ ml for both diets. Copepods fed on Navicula sp. presented a faster development rate and higher naupliar production compared to copepods fed on T. fluviatilis. Size and survival did not vary significantly among diets. The algal concentration interfered significantly in the reproductive success of females. Both very low and very high algal concentrations reduced reproductive success. Concluding, the benthic diatom Navicula sp. was more favorable to the copepod T. biminiensis than the planktonic diatom T. fluviatilis.
机译：这项研究的目的是比较两种硅藻Navicula sp。的饮食影响。 （底栖动物）和地中海藻（Thalasiosira fluviatilis）（浮游生物），对类立足类co足类Tisbe biminiensis的发育，繁殖力和存活率的影响。为了确定食物的最佳浓度，将35名含卵雌性动物置于六个藻类浓度和对照组（不带食物）中。 24小时后，用4％福尔马林固定接受者的含量，然后计数并测量每个雌性产生的粪便颗粒。幼虫的发育通过在成年阶段以6小时为间隔，对每种饮食单独调查50幼体来进行研究。取出铸件外骨骼以计算段数并进行测量。在两种饮食中，每48小时一次，在每组中包含10只雌性藻类浓度不同的雌性，计算无节幼体的繁殖力。通过根据粪便颗粒实验，以最佳藻类浓度饲喂四组，每组10只雌性，测试饮食对繁殖力的影响。在Navicula sp。浓度为0.4μgChl-a / ml（被认为是粪便颗粒生产的最佳选择）时，硅藻显示有毒，导致低成活率并抑制了pe足类卵的产生。考虑到繁殖力，两种饮食的最佳浓度估计为0.1μgChl-a / ml。 pe足类以Navicula sp。相比用T. fluviatilis饲喂的co足类动物，其发育速度更快，无节幼体产量更高。饮食之间的大小和存活率没有显着差异。藻类浓度严重干扰了雌性的繁殖成功。极低和极高的藻类浓度都会降低繁殖成功率。最后，底栖硅藻Navicula sp。比浮游性硅藻T. fluviatilis对co足类T. biminiensis更有利。

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