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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Coupling between microphytobenthic biomass and fiddler crab feeding
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Coupling between microphytobenthic biomass and fiddler crab feeding

机译：藻类底栖生物量与提琴蟹取食的耦合

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Among the organic matter ingested by fiddler crabs, microphytobenthos is of fundamental importance because it is their main N source. Microphytobenthos abundance generally develop semilunar changes as the dynamics of tidal exposures and day-night cycle are not held constant across days, modifying the balance between growth and mortality. In this study we explored the coupling between temporal dynamics in microphytobenthos abundance and crab feeding activity. We measured the Chlorophyll a content in the 2 mm surficial sediment surrounding the burrows and the crab feeding activity over two semilunar cycles. Chlorophyll a and crab feeding activity showed biweekly cyclic dynamics. Crabs did not concentrate feeding activity around days with maximum abundance of microhytobenthos. This phase difference between both dynamics could be the result of the crab feeding impact, but a crab experimental exclusion showed that the temporal dynamics of Chlorophyll a content stayed unchanged when feeding activity was removed. Comparisons between fed and unfed sediment suggest that the feeding efficiency changes with tidal dynamic. Crabs achieved more than 50% of Chlorophyll a extraction during days of highest feeding activity, and less than 30% during days of low feeding activity or low microhytobenthos abundance. Furthermore, comparisons of fed sediment between consecutive days indicated that Chlorophyll a was completely replenished during days with high flooding tides, but partially replenished during days near neap tides. Environmental conditions affecting feeding efficiency may select crabs to concentrate feeding activity before days with the highest microhytobenthos abundance. The low feeding impact on microphytobenthos dynamics suggests that fiddler crabs would not control microhytobenthos abundance and thus unable to absorb the increasing eutrophication of studied estuarine areas.
机译：在招潮蟹摄食的有机物中，微底栖动物是最重要的，因为它是它们的主要氮源。微藻底栖动物的丰度通常会出现半月变化，因为潮汐暴露和昼夜周期的动态在一天中不会保持恒定，从而改变了生长和死亡率之间的平衡。在这项研究中，我们探索了微小底栖鱼类丰富度的时间动态与蟹的摄食活动之间的耦合。我们在两个半月周期内测量了洞穴周围2 mm表层沉积物中的叶绿素a含量以及蟹的摄食活性。叶绿素a和蟹的摄食活动显示出每两周一次的循环动态。螃蟹没有在最大的微型底栖动物数量丰富的日子里集中饲料活动。两种动力学之间的这种相位差可能是螃蟹进食影响的结果，但是螃蟹实验排除结果表明，去除进食活动后叶绿素a含量的时间动态保持不变。进料和未进料沉积物之间的比较表明，进料效率随潮汐动态而变化。在摄食活动最高的日子里，螃蟹的叶绿素a提取量超过50％，在摄食活动低或微底栖动物丰度低的日子里，螃蟹的叶绿素a提取量不到30％。此外，连续两天之间进料沉积物的比较表明，在高潮时，叶绿素a被完全补充，而在近潮时，叶绿素a被部分补充。影响摄食效率的环境条件可能会选择蟹，以便在微型hytobenthothos丰度最高的几天之前集中摄食活动。饲喂对微底栖动物的动态影响低，提示小提琴蟹无法控制微底栖动物的丰度，因此无法吸收研究河口地区日益增加的富营养化。

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