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

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    Date
    2021
    Author
    Paul, P.
    Patil, J.S.
    Anil, A.C.
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    Abstract
    Biologically rich rock-pools (RPs) are prominent component of rocky intertidal habitat and this study elucidates the factors aAecting 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 Cushed 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 dinoCagellates (Amphi-dinium 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-speciBc 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.
    URI
    https://doi.org/10.1007/s12040-021-01591-5
    https://drs.nio.org/drs/handle/2264/8695
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