Field investigations of pumping activity of the facultatively filter-feeding polychaete Nereis diversicolor using an improved infrared phototransducer system
Field investigations of pumping activity of the facultatively filter-feeding polychaete Nereis diversicolor using an improved infrared phototransducer system
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DOI：
10.3354/meps103091
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发表时间：
1994
影响因子：
2.5
通讯作者：
A. Vedel;B. B. Andersen-B.;H. U. Riisgård
中科院分区：
文献类型：
--
作者：
A. Vedel;B. B. Andersen-B.;H. U. Riisgård
现场数据的文件在何种程度上的facultimate滤食性多毛类Nerels dlverslcolor进行悬浮液喂养在一年中的不同时间在2 D n ~ s h shallo\v水域，富营养化（欧登塞峡湾）和未污染（Fyns Hoved）。本文用一种改进的光传感器系统，连续记录反映滤食器摄食的波动性身体运动（pump ~ ng活动）。浮游植物在水中的存在“触发”了蠕虫的摄食，在夏季的生产期间，在50%至100%的监测时间内，蠕虫都在摄食。在早期和秋季，滤食性占总时间的5%至20%。在Fyns Hoved，当l ~ ght开始成为初级生产力的限制因素时，叶绿素a（chl a）浓度在1 ~ 3 pg chl a I ~-的“触发水平”附近波动，并且滤食性仅发生在下午初级生产力将浮游植物生物量提高到触发水平以上时。放牧对N. diversicolor（5月可能为5.6 m3 m-' d '，相当于欧登塞峡湾上覆水柱体积的11至55倍）可能在低风导致水柱混合的日子受到限制，这是由于沉积物上覆的一层再过滤水造成的。在欧登塞峡湾，尽管种群生物量随之减少了3 C %，但随着温度的升高，泵送活动增加，导致种群过滤潜力从3月到6月增加了0 u B h g。氮素泵活性没有温度适应性。五颜六色的这项研究证实，Al. diversicolor利用了一些喂养方法，这取决于季节，浮游植物生物量和当地条件。
Fleld data were obtained that document the extent to which the facultatively filter-feeding polychacte Nerels dlverslcolor undertakes suspension feeding at different times of the year in 2 D a n ~ s h shallo\v water areas, eutrophicated (Odense Fjord) and unpolluted (Fyns Hoved). A modified phototransducer system was used to make continuous long-tern~ recordings of the characteristic undulating body movements ( p u m p ~ n g activity) indicative of filter feedlng. F~l ter feeding was 'triggered' by the presence of phytoplankton in the water, and the worm was fllter feeding 50 to 100% of the time monitored during the productive summer period. In early spnng and autumn filter feeding occurred for about 5 to 20% of total time. At Fyns Hoved in September, when l ~ g h t was beginning to be a limiting factor for primary production, the chlorophyll a (chl a) concentration fluctuated around the 'trigger level' of 1 to 3 pg chl a I-', and filter feeding only took place during the afternoon when primary production had elevated the phytoplankton biomass above the trigger level. The grazing impact of N. diversicolor (potentially 5.6 m3 m-' d ' in May, representing a volume 11 to 55 times greater than the overlying water column in Odense Fjord) was probably restricted on days with low wind-caused mixing of the water column by a thin layer of refiltered water overlying the sediment. lncreased pumping activity with rising temperature led to a d o u b h g of the population filtration potential from March to June in Odense Fjord even though the population biomass was concomitantly reduced by 3 C % . No temperature adaptation of pumping activity was found in N. diversicolor. This study confirms that Al. diversicolor utilizes a number of feeding methods, depending on season, phytoplankton biomass and local conditions.