Retention, breakdown, and biological utilisation of deciduous tree leaves in an estuarine tidal flat of southwestern British Columbia, Canada
Retention, breakdown, and biological utilisation of deciduous tree leaves in an estuarine tidal flat of southwestern British Columbia, Canada
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加拿大不列颠哥伦比亚省西南部河口滩涂落叶树叶的保留、分解和生物利用
DOI：
10.1139/f07-151
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发表时间：
2008
影响因子：
2.4
通讯作者：
J. Richardson
中科院分区：
文献类型：
--
作者：
T. Sakamaki;J. Richardson
在与山间溪流相连的河口泥滩上，研究了落叶树的粗叶材料对无脊椎动物的利用、保留和分解率。河流的叶子沉积在靠近河口的潮间带上部。林分存量在秋季较高（~23.8 g AFDM·m -2），春季基本消失。潮下站和潮间带下游站的红桤叶包分解率（k = 0.013 ~ 0.027·day -1）高于河道站和潮间带上游站（k = 0.006 ~ 0.009·day -1）。叶片与相对温暖的海水接触较长时间可能会增强微生物活动对叶片的破坏。在上游潮间带站，从秋季到春季叶片沉积量的减少（k = 0.023-0.039·day -1）w比叶包中的叶片分解要快，因此在叶片沉积量的减少中，物理输出可能是显著的。与此同时，片脚类动物在无脊椎动物中占主导地位。无脊椎动物密度在天然和聚酯叶片组之间没有显著差异，表明叶片作为微栖息地而不是食物来源的贡献。片脚类动物的碳氮稳定同位素特征表明，底栖微藻是它们的主要食物来源，无论是天然的还是人工的叶包。
In an estuarine mudflat connected to a mountainous stream, coarse leaf material from deciduous trees was examined for its utilisation by invertebrates, retention, and breakdown rate. Leaves from the stream were deposited in the upper intertidal parts near the stream mouth. Their standing stocks were high in fall (~23.8 g AFDM·m -2 ) and mostly disappeared by spring. Breakdown rates of red alder leaf packs were higher at subtidal and lower intertidal stations (k = 0.013-0.027·day -1 ) than at stream channel and upper intertidal stations (k = 0.006-0.009·day -1 ). Longer contact of leaves with relatively warmer seawater may have enhanced leaf breakdown by microbial activities. In the upper intertidal stations, the decrease in the amount of deposited leaves from fall to spring (k = 0.023-0.039·day -1 )w as faster than leaf breakdown in the leaf packs, thus physical export was probably significant in the decrease in deposited leaves. Meanwhile, amphipods dominated the invertebrates colonising leaf packs. The invertebrate densities did not significantly differ between natural and polyester leaf packs, suggesting contribution of leaves as a microhabitat rather than a food source. The carbon and nitrogen stable isotope signatures of amphipods indicated that benthic microalgae were their primary food source regardless of natural or artificial leaf packs.
沿海咸水中叶子的分解及其对大型无脊椎动物 Anisogammarus pugettensis 的利用。
DOI：
--
发表时间：
2006
期刊：
Marine and Freshwater Research 57
影响因子：
--
作者：
櫻井 泉;柳井 清治;伊藤 絹子;Kochi K. & Yanai S.
通讯作者：
Kochi K. & Yanai S.