Distinct interaction effects of warming and anthropogenic input on diatoms and dinoflagellates in an urbanized estuarine ecosystem,Global Change Biology

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Distinct interaction effects of warming and anthropogenic input on diatoms and dinoflagellates in an urbanized estuarine ecosystem
Global Change Biology ( IF 10.8 ) Pub Date : 2021-05-01 , DOI: 10.1111/gcb.15667
Yan Yin Cheung ₁ , Shunyan Cheung _{1,

2} , Julian Mak _{1,

3} , Kailin Liu ₁ , Xiaomin Xia ₄ , Xiaodong Zhang ₁ , Yingkit Yung ₅ , Hongbin Liu _{1,

3,

6}

Affiliation

Diatoms and dinoflagellates are two major bloom-forming phytoplankton groups in coastal ecosystems and their dominances will notably affect the marine ecosystems. By analyzing an 18-year monthly monitoring dataset (2000â€“2017) in the Pearl River Estuary (one of the most highly urbanized and populated estuarine in the world), we observe an increasing trend of the diatom to dinoflagellate ratio (Diatom/Dino). As revealed by multiple statistical models (generalized additive mixed model, random forest, and gradient boosting algorithms), both groups are positively correlated with temperature. Diatoms are positively correlated with nitrate and negatively correlated with ammonium while dinoflagellates show an opposite pattern. The Diatom/Dino trend is explained by an altered nutrient composition caused by a decadal increase in anthropogenic input, at which nitrate increased rapidly while ammonium and phosphate were relatively constant. Regarding the interaction of warming and nutrient dynamics, we observe an additive effect of warming and nitrate enrichment that promotes the increase in diatom cell density, while the dinoflagellate cell density only increases with warming when nutrients are depleted. Our models predict that the Diatom/Dino ratio will further increase with increasing anthropogenic input and global warming in subtropical estuarine ecosystems with nitrate as the dominant inorganic nitrogen; its ecological consequences are worthy of further investigation.

中文翻译：

变暖和人为输入对城市化河口生态系统中硅藻和甲藻的不同相互作用影响

硅藻和甲藻是沿海生态系统中两种主要形成水华的浮游植物群，它们的优势将显着影响海洋生态系统。通过分析珠江口（世界上城市化和人口密度最高的河口之一）的 18 年月度监测数据集（2000 年至 2017 年），我们观察到硅藻与鞭毛藻的比率（Diatom/Dino ）。正如多个统计模型（广义加性混合模型、随机森林和梯度提升算法）所揭示的那样，两组都与温度呈正相关。硅藻与硝酸盐呈正相关，与铵呈负相关，而鞭毛藻则显示相反的模式。硅藻/恐龙趋势的解释是由于人为输入的十年增加导致营养成分的改变，其中硝酸盐迅速增加，而铵盐和磷酸盐相对稳定。关于变暖和养分动态的相互作用，我们观察到变暖和硝酸盐富集的累加效应促进了硅藻细胞密度的增加，而甲藻细胞密度仅在养分耗尽时随着变暖而增加。我们的模型预测，在以硝酸盐为主要无机氮的亚热带河口生态系统中，随着人为输入的增加和全球变暖，硅藻/恐龙的比例将进一步增加；其生态后果值得进一步研究。我们观察到变暖和硝酸盐富集的累加效应促进了硅藻细胞密度的增加，而甲藻细胞密度仅在营养耗尽时随着变暖而增加。我们的模型预测，在以硝酸盐为主要无机氮的亚热带河口生态系统中，随着人为输入的增加和全球变暖，硅藻/恐龙的比例将进一步增加；其生态后果值得进一步研究。我们观察到变暖和硝酸盐富集的累加效应促进了硅藻细胞密度的增加，而甲藻细胞密度仅在营养耗尽时随着变暖而增加。我们的模型预测，在以硝酸盐为主要无机氮的亚热带河口生态系统中，随着人为输入的增加和全球变暖，硅藻/恐龙的比例将进一步增加；其生态后果值得进一步研究。

更新日期：2021-07-02

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