Abstract
Ciliates are highly developed and diverse eukaryotes belonging to the microzooplankton community; they exhibit a wide distributional range and are a crucial component of the microbial food web. The current study addresses the species aggregation of ciliates, which is rare and underreported, from the Indian waters. The aggregation was dominated by coexisting species such as Amphorides quadrilineata and Salpingella faurei during 2018 (45–95%), whereas Dadayiella ganymedes and Helicostomella subulata predominated in 2003 (40%), with both aggregations occurring during late summer monsoon (September) in the region. The species environmental correlation revealed that salinity and chlorophyll a, especially the nanoplankton fraction, were significant factors responsible for the exceptional abundance and community structure. The pattern of association with the distinct lorica oral diameter (LOD) of the coexisting species exhibits an upper range of 28–32 µm (A. quadrilineata and D. ganymedes) and a lower LOD range of 15–17 µm (S. faurei and H. subulata), delineating a niche based on resource spectrum and revealing why certain species successfully predominate in utilizing the available resources. Although such events have received sporadic attention, the recurrence of aggregation comprising strategic coexistence of species indicates the status of the ecosystem and argues for future monitoring to better understand the dynamics of the region.
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The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
Authors acknowledge the Secretary, Ministry of Earth Sciences for providing the facilities and support. We thank Dr. M. Sudhakar, former Director, Centre for Marine Living Resources and Ecology whose support greatly helped in the implementation of the project Marine Ecosystem Dynamics of Eastern Arabian Sea (MEDAS) under the Marine Living Resources Programme. All the participants of MEDAS cruises who rendered help in sampling are acknowledged. Satellite-derived SST and Chlorophyll data are taken from Aqua-MODIS, SLA and Geostrophy currents retrieved from AVISO/Miller are duly acknowledged. Authors acknowledge the anonymous reviewers for constructive comments that improved the manuscript. This is CMLRE contribution number 173.
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CRAD: conceptualization, data analysis, validation and interpretation, writing. JM: sample and data analysis, writing. NNSV: physical oceanography data analysis, plotting and writing. CKS: nutrient analysis, plotting and writing. KJA: chlorophyll data analysis, plotting and writing. IA: statistical analysis and writing. GVMG: editorial corrections.
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Asha Devi, C.R., Mondal, J., Vishnu, N.N.S. et al. Factors regulating proliferation and co-occurrence of loricate ciliates in the microzooplankton community from the eastern Arabian Sea. Aquat Sci 86, 31 (2024). https://doi.org/10.1007/s00027-024-01047-0
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DOI: https://doi.org/10.1007/s00027-024-01047-0