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首页> 外文期刊>Archiv fur Hydrobiologie >Small-scale detritus-invertebrate interactions: influence of detrital biofilm composition on development and reproduction in a meiofaunal copepod
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Small-scale detritus-invertebrate interactions: influence of detrital biofilm composition on development and reproduction in a meiofaunal copepod

机译：小规模碎屑-无脊椎动物相互作用：碎屑生物被膜成分对甲足au足类动物发育和繁殖的影响

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Microbial biofilms improve the quality and palatability of coarse particulate organic matter (CPOM) for freshwater invertebrates, but small-scale interactions between CPOM-associated biofilms and meiofauna are poorly understood. The aim of this work was to investigate whether the composition of biofilms attached to leaf litter influenced development (from nauplius to adult) and reproduction (embryonic developmental time and number of broods, eggs and nauplii per female) of the meiofaunal copepod Bryocamptus zschokkei. Biofilm composition was varied by allowing growth on different species of leaf (beech, Fagus sylvatica vs. oak, Quercus robur) and for different periods of time (beech leaves conditioned for 2 vs. 6 weeks). Despite significant differences in biofilm composition between oak and beech leaves (greater microbial colonisation and bacterial densities on the former), there was no significant difference in the development or reproduction of B. zschokkei fed on these biofilms. There were, however, significant differences in copepod reproduction between leaves conditioned for different times. Hatching success was significantly higher on leaves conditioned for 6 compared with 2 weeks, reflecting increased diatom densities on the former and suggesting that micro-algae may be an important food source to ovigerous females. Conversely, copepodid development was significantly slower on leaves conditioned for 6 compared with 2 weeks, reflecting the significantly lower bacterial densities on the latter; bacteria are likely to be a major component of the diet of smaller copepod life stages. These data suggest that small-scale changes in the composition of microbial biofilms can have a significant and complex influence on the life-history characteristics of B. zschokkei, and such meiofauna-detritus interactions may have important implications for the trophic dynamics of streams. [References: 30]
机译：微生物生物膜提高了淡水无脊椎动物粗粒有机物（CPOM）的质量和适口性，但与CPOM相关的生物膜与鱼类动物之间的小规模相互作用尚不清楚。这项工作的目的是调查附着在叶子凋落物上的生物膜的组成是否影响了of足的pe足类Bryocamptus zschokkei的发育（从无节幼体到成年）和繁殖（胚胎发育时间以及每只雌性的育雏，卵和无节幼体的数量）。通过允许在不同种类的叶片上生长（山毛榉，青冈对橡树，栎栎）和在不同的时间段（适应2周和6周的山毛榉叶）生长，生物膜组成发生变化。尽管橡木和山毛榉叶之间的生物膜组成存在显着差异（较大的微生物定植和细菌密度在前者上），但以这些生物膜为食的B. zschokkei的发育或繁殖没有显着差异。然而，适应不同时间的叶片之间的pe足类繁殖有显着差异。适应6个条件的叶子的孵化成功率要比2周高得多，这反映了前者的硅藻密度增加，这表明微藻可能是有卵雌性的重要食物来源。相反，适应2到6周的叶片的整足发育显着慢于2周，这反映了后者的细菌密度显着降低。细菌可能是co足类动物生命周期较小的饮食中的主要成分。这些数据表明，微生物生物膜组成的小范围变化可能会对拟南芥的生活史特征产生重大而复杂的影响，而这种动物－碎屑的相互作用可能对河流的营养动力学具有重要意义。 [参考：30]

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