• Phytoplankton communities in marine intertidal rock-pools: Effect of location, geometric shapes and allelopathy

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      https://www.ias.ac.in/article/fulltext/jess/130/0128

    • Keywords

       

      Rock-pools; microalgae; taxonomy; morphological traits; Amphidinium; allelopathy.

    • 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.

      $\bf{Highlights}$

      $\bullet$ Investigated factors influencing distribution of phytoplankton (species and shape-wise) in intertidal rock pools (RPs) of Anjuna rocky shores, Goa.

      $\bullet$ Location of RPs determined nature of phytoplankton community, i.e., less diversity and high abundance in high-tide RPs than mid/low-tide RPs.

      $\bullet$ Spherical-shaped dinoflagellates and elongated shape diatoms dominated phytoplankton community of high and mid/low tide RPs, respectively.

      $\bullet$ Even though the species composition changed temporally the shape dominance remained consistent suggesting the latter as a robust morphological trait.

      $\bullet$ Dominant dinoflagellate, Amphidinium caterae sensu stricto, also showed species-specific allelopathy on other phytoplankton.

    • Author Affiliations

       

      P PAUL1 2 J S PATIL1 A C ANIL1

      1. CSIR-National Institute of Oceanography, Dona Paula 403 004, Goa, India.
      2. School of Earth, Ocean and Atmospheric Sciences, Goa University, Taleigao Plateau 403 206, Goa, India.
    • Dates

       
  • Journal of Earth System Science | News

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