潮汐周期对红树林为主的热带潮汐溪浮游植物群落组合的影响。

Fisheries Resources Harvest and Post-Harvest Management Division, ICAR-Central Institute of Fisheries Education, Versova, Off-Yari Road, Mumbai, 400061, India.

ICAR-Central Inland Fisheries Research Institute, Barrackpore, Kolkata, 700120, WB, India.

Environ Monit Assess. 2024 Aug 7;196(9):795. doi: 10.1007/s10661-024-12954-y.

A comparative assessment of phytoplankton dynamics during low tide (LT) and high tide (HT) was conducted from February 2022 to January 2023 in a tropical mesotidal creek, Manori, Mumbai, India. In total, 124 phytoplankton species were recorded. The HT resulted in greater species richness (124 species) and diversity indices (Shannon-Wiener's index) than the LT (102 species). The Pielou's evenness (J') and Simpson's dominance index (1-D) did not show significant fluctuations with the tides due to the marine phytoplankton species moving rhythmically in and out of the creek with the tides. Overall, the seasonal abundance was maximum during pre-monsoon at HT (5.79 × 10 u/L) and lowest in monsoon at LT (0.45 × 10 u/L), whereas spatial abundance was maximum at S1 (HT- 4.04 × 10 u/L) at HT and lowest at S3 (LT- 0.75 × 10 u/L) at LT. The diatoms dominated in their abundance (1.83 × 10 u/L and 3.82 × 10 u/L in HT) and diversity (77 in LT and 92 in HT). The species such as Coscinodiscus centralis, Coscinodiscus granii, Coscinodiscus radiatus, Triops furca, Melosira varians, Nitzchsia palea, Chaetoceros affinis, Skeletonema marinoi, Stephanocyclus meneghinianus, Planktoniella sol and Skeletonema costatum were the dominant native residents in the creek. SIMPER analysis revealed that the maximum similarity was during the monsoon (47.65%), and the minimum was during the pre-monsoon (38.10%) at LT. However, in HT, the maximum similarity of phytoplankton shifted to post-monsoon (63.85%) and the minimum during the pre-monsoon (46.71%). The mean value of richness (d') and Shannon's diversity (H') showed a moderate phytoplankton diversity in the system. The environmental parameters (water temperature > pH > nitrate > salinity > DO > Alk > silicate) have a greater influence on the distribution of the phytoplankton community with tides as revealed by the Canonical correspondence analysis. Therefore, it has been found that tides play a significant role in the distribution and abundance of the phytoplankton community in a mesotidal creek environment.

对印度孟买马诺里的一个热带中潮带小溪从 2022 年 2 月到 2023 年 1 月的低潮（LT）和高潮（HT）期间的浮游植物动态进行了比较评估。共记录了 124 种浮游植物。与 LT（102 种）相比，HT 导致更高的物种丰富度（124 种）和多样性指数（香农-威纳指数）。由于海洋浮游植物随潮汐有节奏地进出小溪，皮尔洛均匀度（J'）和辛普森优势度指数（1-D）没有随着潮汐出现显著波动。总体而言，季节性丰度在 HT 的前季风期最高（5.79×10 u/L），在 LT 的季风期最低（0.45×10 u/L），而空间丰度在 HT 的 S1 处最高（HT-4.04×10 u/L），在 LT 的 S3 处最低（LT-0.75×10 u/L）。硅藻在丰度（HT 中为 1.83×10 u/L 和 3.82×10 u/L）和多样性（LT 中为 77 种和 HT 中为 92 种）方面占主导地位。中肋骨条藻、中肋骨条藻、辐射骨条藻、三尾真猛水蚤、变种菱形藻、苍白海链藻、拟角毛藻、马氏骨条藻、斯蒂芬西库斯·梅内吉尼安努斯、浮游生物溶胶和骨条藻属是小溪中的主要本地居民。SIMPER 分析显示，最大相似性发生在季风期（47.65%），最小相似性发生在 LT 的前季风期（38.10%）。然而，在 HT 中，浮游植物的最大相似性转移到了后季风期（63.85%），而在 LT 的前季风期则是最小的（46.71%）。丰富度（d'）和香农多样性（H'）的平均值表明该系统中的浮游植物多样性处于中等水平。根据典范对应分析，水温和 pH 值>硝酸盐>盐度>溶解氧>碱度>硅酸盐对浮游植物群落的分布有更大的影响，这表明潮汐在其中发挥了重要作用。因此，已经发现潮汐在中潮带小溪环境中对浮游植物群落的分布和丰度起着重要作用。