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首页> 外文期刊>Marine biology >Diatoms of the microphytobenthic community in a tropical intertidal sand flat influenced by monsoons: spatial and temporal variations
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Diatoms of the microphytobenthic community in a tropical intertidal sand flat influenced by monsoons: spatial and temporal variations

机译：受季风影响的热带潮间带沙地微底栖动物硅藻：时空变化

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摘要

Seasonal variations in the microphytobenthic diatom community were investigated in an intertidal sand flat of a tropical marine environment influenced by monsoons. Cores of sediments were collected along the beach gradient: low tide, mid tide and high tide zone up to a depth of 15 cm.. Diatom abundance was lowest during the monsoons and highest during the post-monsoons and the early pre-monsoon season throughout the intertidal transect. Diatom diversity was highest at the mid tide, followed by the high and low tide zones. Diatoms were viable up to a depth of 15 cm throughout the intertidal transect. The diatom community included the pennates, the permanent residents of this area, centric genera, which lead an attached mode of life and also some planktonic genera, brought in from ambient waters. Among the pennates, Navicula and Amphora were the dominant genera whereas in the case of centries, Thalassiosira dominated the community throughout the intertidal transect down to a 15 cm depth. . Grain size fractions, which served as predictors of some diatom genera changed with tidal zones. The effect of winds on the resuspension of the pennate diatoms was evident only at the low tide zone down to a depth of 5 cm . Chlorophyll a concentration proved to be a good predictor of both pennate and centric diatom abundance at the low tide zone down to a depth of 10 cm and at the mid tide zone down to a depth of 5 cm.. However, even though chlorophyll a concentrations failed to reveal any positive correlation with the diatom abundance at both the deeper sediment layers and the high tide zone, the fact that viable cells were present at these areas reveal that the diatoms adopt survival strategies, contributing significantly to the carbon budgets of such unstable habitats.
机译：在季风影响下的热带海洋环境的潮间带沙滩中调查了微底栖硅藻群落的季节性变化。沿着海滩梯度收集了沉积物的核心：低潮，中潮和高潮区，最深达15厘米。硅藻的丰度在季风期间最低，在季风后和季风前早期整个季节最高潮间带硅藻多样性在中潮时最高，其次是高潮区和低潮区。整个潮间样带的硅藻都可以存活到15厘米深。硅藻群落包括戊二烯，该区域的永久居民，中心属，这些人过着依附的生活方式，也有一些浮游生物从周围的水域带入。在半边形中，Navicula和Amphora是主要的属，而在百分百的情况下，Thalasiosira则在整个潮间样带中以15厘米的深度主导着该群落。 。晶粒度分数是某些硅藻属的预测因子，随潮汐带变化。风对三角硅藻重悬浮的影响仅在退潮区域下降到5厘米时才明显。叶绿素a浓度被证明是低潮区低至10 cm深度和中潮区低至5 cm深度的戊二烯和中心硅藻丰度的良好预测指标。但是，即使叶绿素a浓度高未能揭示出在更深的沉积层和高潮区硅藻的丰度有任何正相关，在这些区域存在活细胞的事实表明硅藻采用了生存策略，从而极大地促进了这种不稳定栖息地的碳收支。

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