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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >An experimental approach to estimate egg production and development rate of the calanoid copepod Eurytemora affinis in Chesapeake Bay, USA
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An experimental approach to estimate egg production and development rate of the calanoid copepod Eurytemora affinis in Chesapeake Bay, USA

机译：一种估算美国切萨皮克湾的cal足类pe足类Eurytemora affinis卵产生和发育速率的实验方法

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摘要

The calanoid copepod Eurytemora affinis is the dominant copepod in Chesapeake Bay oligohaline regions and an important food source for larval fish, particularly during its early spring abundance peak. We measured life-history traits of E. affinis in cultures reared from Chesapeake Bay collections in food-saturated laboratory conditions at two temperatures (14° and 18 ℃) and four salinities (1,5,15 and 21). We measured female life span, egg production, eggs produced over the life span, hatching success, mean clutch size, inter-clutch duration and nauplii survival. Adult females lived more than 2 months and produced more than 2500 eggs at 14 ℃ and salinity 5, with egg hatching success >90%. Mean clutch size and inter-clutch time varied as a function of both temperature and adult senescence and ranged from 40 to 110 eggs clutch"1 and 1.9 to 3.4 days, respectively. Egg production rate was also affected by adult senescence and averaged 37.8 eggs female~(-1) day~(-1) at 14 ℃ and salinity 5. Our results showed that E. affinis were adapted to cooler, fresher conditions more than the other dominant calanoid copepod in the Chesapeake Bay, Acartia tonsa, which has been shown to be well adapted to warmer temperatures and higher salinities. £. affinis exhibited better survival, development rate and naupliar production in lower temperatures and salinities compared to A tonsa. At higher temperatures and salinities, E. affinis repeatedly released egg sacs with unhatched eggs prior to extrusion of a new egg sac. The dropped egg sacs contained eggs that were not yet hatched, a condition not observed in other species in the genus Eurytemora and which may indicate a potential cost of carrying eggs at higher temperatures.
机译：在切萨皮克湾低盐地区，cal足类pe足类Eurytemora affinis是主要的pe足类，并且是幼体鱼的重要食物来源，尤其是在其早春丰度高峰期。我们在两个温度（14°和18℃）和四个盐度（1、5、15和21）下，在食品饱和的实验室条件下，测量了切萨皮克湾（Chesapeake Bay）集合饲养的文化中大肠杆菌的生命历史特征。我们测量了雌性寿命，产卵量，寿命内产卵量，孵化成功率，平均离合大小，离合间持续时间和无节幼体存活率。成年雌性存活超过2个月，在14℃和盐度为5的条件下，产卵超过2500个，卵孵化成功率> 90％。平均离合大小和离合间时间随温度和成年衰老而变化，分别在40至110个卵离合“ 1”和1.9至3.4天之间变化。成年率也受成年衰老影响，雌性平均为37.8个卵〜（-1）天〜（-1）在14℃和盐度为5时。我们的结果表明，与切萨皮克湾阿卡斯蒂亚·通萨（Acartiatonsa）的其他优势cal足类足形动物相比，近亲大肠杆菌更适应凉爽，新鲜的条件。相对于A tonsa，在较低的温度和盐度下，亲和子表现出更好的存活，发育速度和无节幼体的生产；在较高的温度和盐度下，亲和子反复释放未孵化的卵的卵囊。在取出新的卵囊之前，掉下的卵囊中含有尚未孵化的卵，在Eurytemora属的其他物种中未发现这种情况，这可能表明潜在的携带成本在较高温度下鸡蛋。

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    David Devreker; James J. Pierson; Sami Souissi; David G. Kimmel; Michael R. Roman;

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    University Lille Nord de France, F-59000 Lille, France,USTL, Laboratoire d'Oceanographie et Ceosdences, F-62930 Wimereux, France,CNRS, UMR 8187, F-62930 Wimereux, France,University of Maryland Center for Environmental Science, Horn Point Laboratory, P.O. Box 775, Cambridge, MD 21613, USA;

    University of Maryland Center for Environmental Science, Horn Point Laboratory, P.O. Box 775, Cambridge, MD 21613, USA;

    University Lille Nord de France, F-59000 Lille, France,USTL, Laboratoire d'Oceanographie et Ceosdences, F-62930 Wimereux, France,CNRS, UMR 8187, F-62930 Wimereux, France;

    Department of Biology, Institute for Coastal Science and Policy, East Carolina University, Greenville, NC 27858, USA;

    University of Maryland Center for Environmental Science, Horn Point Laboratory, P.O. Box 775, Cambridge, MD 21613, USA;

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  • 正文语种 eng
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  • 关键词

    chesapeake bay; empirical models; eurytemora affinis populations; life cycle; salinity; temperature;

    机译：切萨皮克湾;经验模型;假单胞菌种群;生命周期;盐度;温度;

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