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首页> 外文期刊>Journal of oceanography >Effects of the copepod community structure on fecal pellet flux in Kagoshima bay, a deep, semi-enclosed embayment
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Effects of the copepod community structure on fecal pellet flux in Kagoshima bay, a deep, semi-enclosed embayment

机译：pe足类群落结构对鹿儿岛湾（一个半封闭的深水湾）粪便颗粒通量的影响

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Seasonal changes in the shape and size composition of fecal pellets were investigated with sediment trap samples from 50 and 150 m in Kagoshima Bay to evaluate how the mesozooplankton community affects fecal pellet flux. Deep vertical mixing was evident in March, and thermal stratification was developed above 50 m in June, August and November. Chlorophyll a, suspended particulate organic carbon (POC) and copepod abundance were uniform throughout the water column during the seasonal mixing and concentrated above 50 m in the stratified seasons. Calanoids were the most predominant copepods in March and poecilostomatoids composed more than 45% of the copepod community in June, August and November. Fecal pellet fluxes at 50 and 150 m were the highest in March, nearly half of POC flux. The relative contribution declined considerably in the other months, especially for less than 4% of POC flux in August. The decline was corresponded to the predominance of cyclopoids and poecilostomatoids. Cylindrical pellets dominated the fecal matters at both depths throughout the study period, while larger cylindrical pellets nearly disappeared at 150 m in June, August and November. Copepod incubation revealed that cylindrical and oval pellets were egested by calanoids and the other copepods, respectively. We suggest that cylindrical fecal pellets produced by calanoid copepods contribute to feces flux but the predominance of poecilostomatoids and/or cyclopoids decreases feces flux via the increase of oval pellets and fragmentation of larger cylindrical pellets.
机译：利用鹿儿岛湾50 m和150 m的沉积物陷阱样品调查了粪便颗粒的形状和大小组成的季节性变化，以评估中微浮游动物群落如何影响粪便颗粒通量。 3月出现了深度垂直混合，6月，8月和11月在50 m以上形成了热分层。在季节性混合过程中，整个水柱中的叶绿素a，悬浮颗粒有机碳（POC）和pe足类的丰度是均匀的，并且在分层季节中集中在50 m以上。在三月份，类固醇是最主要的co足类动物，在六月，八月和十一月，类足足类动物占4足类群落的45％以上。 3月，50和150 m的粪便颗粒通量最高，接近POC通量的一半。在其他月份中，相对贡献显着下降，尤其是在8月份POC流量不到4％的时候。下降对应于主要的摆线和类气孔。在整个研究期间，圆柱状颗粒在两个深度均占粪便的主要部分，而较大的圆柱状颗粒则在6月，8月和11月的150 m处几乎消失。 pe足类的孵化显示，圆柱形和椭圆形的小球分别被类an龙和其他足足类的雌性筑巢。我们建议由cal足类co足类动物产生的圆柱形粪便颗粒有助于粪便通量，但由于椭圆形颗粒的增加和较大的圆柱形颗粒的破碎，主要的类表皮类气孔菌和/或环胞菌会降低粪便的通量。

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