Egg production by the copepod, Eurytemora affinis, in Chesapeake Bay turbidity maximum regions
Egg production by the copepod, Eurytemora affinis, in Chesapeake Bay turbidity maximum regions
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切萨皮克湾浑浊度最高地区桡足类 Eurytemora affinis 的产卵
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发表时间：
2013
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影响因子：
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通讯作者：
M. Roman
中科院分区：
文献类型：
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作者：
Scott Lloyd;David T. Elliott;M. Roman
桡足动物Eurytemora affinis在包括切萨皮克湾（Chesapeake Bay）在内的世界各地的河口浊度峰值（ETMs）中表现出最大的丰度。我们进行了affinis的卵窝大小（CS）测量，以帮助理解为什么这种桡足类物种在ETM区域达到最大丰度。不考虑食物的数量和质量，单靠染色体长度是预测卵子CS的最佳指标。CS与营养变量的关系以及测量的颗粒有机碳浓度与生物能量学模型预测的食物需要量的比较都表明，切萨皮克湾ETMs的亲和蛋产量并不受食物限制。此外，基于切萨皮克湾和Choptank河etm季节的营养指标表明，食物质量足以支持最大的亲和力。因此，我们假设非生物因素、捕食和平流限制了切萨皮克湾ETM地区的飞蛾种群数量，而不是食物资源。在切萨皮克湾ETMs中，当温度高于188℃时，affinis的产蛋率开始下降，这与实验室实验结果相似，这可能有助于解释从冬春季的affinis到夏季的桡足类Acartia tonsa的演替优势转换。
The copepod, Eurytemora affinis, exhibits maximum abundance in estuarine turbidity maxima (ETMs) of estuaries around the world, including the Chesapeake Bay. We performed egg clutch size (CS) measurements of E. affinis to help understand why this copepod species reaches maximum abundance within ETM regions. Prosome length alone, without any measure of food quantity or quality, was the best predictor for egg CS. The relationship of CS with nutritional variables and the comparison of measured particulate organic carbon concentrations with food requirements predicted from bioenergetics models both suggest that E. affinis egg production is not food limited in Chesapeake Bay ETMs. In addition, nutrition indices based on the seston of the Chesapeake Bay and Choptank River ETMs suggest that food quality was sufficient to support the maximum E. affinis production. Thus, we postulate that abiotic factors, predation and advection limit E. affinis populations in the Chesapeake Bay ETM regions rather than food resources. In Chesapeake Bay ETMs, E. affinis egg production rates began to decrease when temperatures were above 188C which is similar to results found in laboratory experiments and may help explain the successional dominance switch from E. affinis in winter-spring to the copepod Acartia tonsa in summer.