Effects of small rivers on chemical properties of sediment and diets for primary consumers in estuarine tidal flats
Effects of small rivers on chemical properties of sediment and diets for primary consumers in estuarine tidal flats
复制标题
小河流对河口滩涂沉积物化学性质和主要消费者饮食的影响
DOI：
10.3354/meps07388
复制
发表时间：
2008
影响因子：
2.5
通讯作者：
J. Richardson
中科院分区：
文献类型：
--
作者：
T. Sakamaki;J. Richardson
我们比较了加拿大不列颠哥伦比亚省西南部3个具有不同流域特征的河口滩涂从小河流输送的颗粒有机物（POMR）对沉积物化学性质和主要消费者饮食的影响。源头河流（年平均流量0.1 至1.9 m 3 s -1 ）流经森林和城市化地区（FR）或农业区（AG1 和AG2）。 FR 中 POMR 的 C:N 比（8.6 至 10.1）显着高于 AG1 和 AG2（6.7 至 7.0）。 FR中的河水叶绿素a浓度（0.4μgl -1 ）显着低于AG1和AG2（9.4至10.3μgl -1 ）。在FR滩涂中，沉积物有机质（SPOM）具有相对较高的C:N比（FR，17.9；AG1，9.6和AG2，8.2），表明陆地有机质的积累。基于稳定同位素测量的混合模型（IsoSource）计算表明，在FR滩涂中，POMR在SPOM中占主导地位（约70％），这也表明POMR是一些初级消费者（37％至48％）的重要食物来源，底栖微藻也是如此（35％至45％）。在 AG1 和 AG2 中，POMR 并未在 SPOM 中占主导地位，并且没有证据表明大型底栖动物饮食中显着掺入 POMR。在本研究中，来自拥有大量森林面积的流域的 POMR 似乎对滩涂沉积物和大型底栖动物饮食的化学性质影响更大。这可能归因于 POMR 在滩涂沉积物中的低降解性和长期保留。
We compared effects of particulate organic matter (POM) transported from small rivers (POMR) on chemical properties of sediment and diets of primary consumers in 3 estuarine tidal flats with different watershed characteristics in southwestern British Columbia, Canada. The source rivers (0.1 to 1.9 m 3 s -1 , annual mean) flowed through forested and urbanized areas (FR) or through agricul- tural areas (AG1 and AG2). The C:N ratio of POMR was significantly higher in FR (8.6 to 10.1) than in AG1 and AG2 (6.7 to 7.0). The chlorophyll a concentration of river water was significantly lower in FR (0.4 µg l -1 ) than in AG1 and AG2 (9.4 to 10.3 µg l -1 ). In the tidal flat of FR, organic matter of sediment (SPOM) had relatively higher C:N ratios (FR, 17.9; AG1, 9.6 and AG2, 8.2), suggesting the accumula- tion of terrestrial organic matter. Mixing model (IsoSource) calculations based on stable isotope mea- surements showed that in the tidal flat of FR, POMR was dominant in SPOM (~70%), also suggesting POMR was an important food source for some primary consumers (37 to 48%) as were benthic microalgae (35 to 45%). In AG1 and AG2, POMR did not dominate SPOM, and there was no evidence of significant incorporation of POMR into macrobenthos diets. In the present study, POMR from the watershed with substantial forest areas appeared to be more influential on the chemical properties of sediment and macrobenthos diets in the tidal flat. This could be attributed to the low degradability and long retention of POMR in the tidal flat sediments.
根据稳定同位素分析估算双壳类动物对陆地有机物的去除量
DOI：
--
发表时间：
2008
期刊：
影响因子：
--
作者：
M. S. ISCAM;M. Ueno;Y. Yamashita;秋山諭・上野正博・山下洋;A.Kasai
通讯作者：
A.Kasai
影响因子：
5
作者：
DENIRO, MJ;EPSTEIN, S
通讯作者：
EPSTEIN, S