Phytoplankton communities in marine intertidal rock-pools: Effect of location, geometric shapes and allelopathy,Journal of Earth System Science

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Phytoplankton communities in marine intertidal rock-pools: Effect of location, geometric shapes and allelopathy
Journal of Earth System Science ( IF 1.3 ) Pub Date : 2021-06-24 , DOI: 10.1007/s12040-021-01591-5
P Paul , J S Patil , A C Anil

Abstract

Biologically rich rock-pools (RPs) are prominent component of rocky intertidal habitat and this study elucidates the factors affecting the phytoplankton distribution from high-tide (HT), mid-tide (MT) and low-tide (LT) RPs (Anjuna rocky shores, Goa, India), during the summer season. Results revealed that the RP location determines the nature of phytoplankton assemblage. MT-RPs and LT-RPs supported rich microalgal diversity (species number/morphological shapes) than HT-RPs. However, the cell abundance was higher in latter than former RPs. In frequently flushed MT-RPs and LT-RPs, pennate diatoms (Pseudonitzschia, Nitzschia, Thalasionema, Navicula, and Licmophora) representing elongated shapes dominated, whereas in stagnant HT-RPs spherical/combined shaped dinoflagellates (Amphidinium carterae sensu stricto and Bysmatrum gregarium) dominated. Interestingly, even though the taxonomic assemblages changed temporally the shape dominance remained consistent suggesting shape as a robust morphological trait. Additionally, the study also revealed the existence of species-specific allelopathy on other microalgae by Amphidinium (potential harmful algae) indicating a type of adaptive strategy, in addition to eurytolerant capabilities, for its predominance in HT-RPs, which experiences varying environmental (light, temperature, and salinity) conditions.

Research Highlights

Investigated factors influencing distribution of phytoplankton (species and shape-wise) in intertidal rock pools (RPs) of Anjuna rocky shores, Goa.
Location of RPs determined nature of phytoplankton community, i.e., less diversity and high abundance in high-tide RPs than mid/low-tide RPs.
Spherical-shaped dinoflagellates and elongated shape diatoms dominated phytoplankton community of high and mid/low tide RPs, respectively.
Even though the species composition changed temporally the shape dominance remained consistent suggesting the latter as a robust morphological trait.
Dominant dinoflagellate, Amphidinium caterae sensu stricto, also showed species-specific allelopathy on other phytoplankton.

中文翻译：

海洋潮间带岩池中的浮游植物群落：位置、几何形状和化感作用的影响

摘要

生物丰富的岩石池 (RPs) 是岩石潮间带栖息地的重要组成部分，本研究阐明了影响高潮 (HT)、中潮 (MT) 和低潮 (LT) RPs (Anjuna rocky海岸，印度果阿邦），在夏季。结果表明，RP 位置决定了浮游植物组合的性质。MT-RPs 和 LT-RPs 比 HT-RPs 支持丰富的微藻多样性（物种数量/形态形状）。然而，后者的细胞丰度高于前者的 RP。在频繁冲洗的 MT-RPs 和 LT-RPs 中，羽状硅藻（Pseudonitzschia、Nitzschia、Thalasionema、Navicula和Licmophora) 代表细长的形状占主导地位，而在停滞的 HT-RP 中，球形/组合形状的鞭毛藻 ( Amphidinium carterae sensu stricto和Bysmatrum gregarium ) 占主导地位。有趣的是，尽管分类组合在时间上发生了变化，但形状优势仍然一致，表明形状是一种强大的形态特征。此外，该研究还揭示了Amphidinium（潜在有害藻类）对其他微藻存在物种特异性化感作用，表明除 eury 耐受能力外，其在 HT-RPs 中占主导地位，这是一种适应性策略，它经历不同的环境（光、温度和盐度）条件。