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首页> 外文期刊>Nitrogen >Physiological Responses of the Copepods Acartia tonsa and Eurytemora carolleeae to Changes in the Nitrogen:Phosphorus Quality of Their Food
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Physiological Responses of the Copepods Acartia tonsa and Eurytemora carolleeae to Changes in the Nitrogen:Phosphorus Quality of Their Food

机译：Copepods Acartia Tonsa和Eurytemora Carolleeae的生理反应变化氮气的变化：其食物的磷品质

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Two contrasting estuarine copepods, Acartia tonsa and Eurytemora carolleeae, the former a broadcast spawner and the latter a brood spawner, were fed a constant carbon-based diatom diet, but which had a variable N:P content, and the elemental composition (C, N, P) of tissue and eggs, as well as changes in the rates of grazing, excretion, egg production and viability were measured. To achieve the varied diet, the diatom Thalassiosira pseudonana was grown in continuous culture at a constant growth rate with varying P supply. Both copepods altered their chemical composition in response to the varied prey, but to different degrees. Grazing (clearance) rates increased for A. tonsa but not for E. carolleeae as prey N:P increased. Variable NH4+ excretion rates were observed between copepod species, while excretion of PO43? declined as prey N:P increased. Egg production by E. carolleeae was highest when eating high N:P prey, while that of A. tonsa showed the opposite pattern. Egg viability by A. tonsa was always greater than that of E. carolleeae. These results suggest that anthropogenically changing nutrient loads may affect the nutritional quality of food for copepods, in turn affecting their elemental stoichiometry and their reproductive success, having implications for food webs.
机译：两种对比的雌氨碱蛋白酶，Acartia Tonsa和Eurytemora Carolleeae，前一种广播水疗者和后者是育雏饮食，但具有可变N：P含量和元素组成（C，测量组织和卵的N，P）以及放牧，排泄，鸡蛋产生和活力的变化。为了达到各种饮食，硅藻土丘亚纳在连续培养物中以不同的P供应恒定的生长速度生长。两种桡足蛋白酶响应于多种猎物而改变它们的化学成分，但对不同程度改变。 A. Tonsa的放牧（间隙）率增加，但不适用于E. Carolleeae作为猎物N：P增加。在桡足物种之间观察到可变NH4 +排泄率，而PO43排泄物作为猎物N：P增加了。 E. Carolleeae的鸡蛋产生高N：P猎物时最高，而A. Tonsa的表现出相反的模式。 A. Tonsa的鸡蛋活力总是大于Carolleeae的活力。这些结果表明，人为变化的营养载荷可能会影响桡足类药物的营养质量，反过来影响其元素化学计量和其生殖成功，对食品网具有影响。

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