Revisiting silicon budgets at a tropical continental shelf: Silica standing stocks in sponges surpass those in diatoms
Revisiting silicon budgets at a tropical continental shelf: Silica standing stocks in sponges surpass those in diatoms
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重新审视热带大陆架的硅预算：海绵中的硅库存超过硅藻中的硅库存
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发表时间：
2010
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通讯作者：
Klaus RÜ tzlerb
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作者：
M. Maldonado;A. Riesgo;Arianna Bucci;Klaus RÜ tzlerb
大多数硅（Si）在海洋海岸系统被认为是在浮游硅藻的生物控制下再循环。在比较了中美洲加勒比海广阔大陆架地区五个栖息地浮游硅藻群落和底栖海绵群落贡献的生物源二氧化硅（bSi）常绿储量后，我们对这一观点提出了挑战。在大多数生境（外礁、斑块礁、海草床和红树林），海绵bSi储量超过硅藻。总体而言，海绵群落中bSi约占总Si库的88.6%。硅藻占4.2%，环境硅酸盐占7.2%。因此，在构建沿海地区未来的区域硅预算时，在确定其对总量的贡献可以忽略不计之前，应对海绵种群中的硅存量进行实证检验。为了了解与海绵相关的沿海地区的硅通量，我们需要额外的经验方法来设定海绵bSi周转的时间尺度，海绵bSi周转似乎比硅藻bSi周转慢得多。
Most of the silicon (Si) in marine coastal systems is thought to recirculate under the biological control of planktonic diatoms. We challenge this view after comparing the biogenic silica (bSi) standing stocks contributed by communities of planktonic diatoms and benthic sponges in five habitats of an extensive continental shelf area of the Mesoamerican Caribbean. In most habitats (outer reefs, patch reefs, sea grass beds, and mangroves), the sponge bSi stocks surpassed those of diatoms. Collectively, bSi in sponge communities was about 88.6% of the total Si pool. Diatoms represented 4.2% and ambient silicate about 7.2%. Consequently, when constructing future regional Si budgets in coastal areas, the Si standing stocks in sponge populations should be empirically examined before deciding that their contribution to the total is negligible. In order to understand Si fluxes in coastal areas where sponges are relevant, we need additional empirical approaches to set the timescale of sponge bSi turnover, which appears to be substantially slower than that of diatom bSi.