Occurrence and abundance of copepods in zooplankton assemblages at Sonmiani Bay, northern Arabian Sea

Shumaila Mubarak; Qadeer Muhammad Ali

doi:10.29103/joms.v3i1.24428

Authors

Shumaila Mubarak Marine Reference Collection and Resource Centre (MRC&RC), University of Karachi, Karahi, Pakistan https://orcid.org/0000-0003-1208-1728
Qadeer Muhammad Ali Marine Reference Collection and Resource Centre (MRC&RC), University of Karachi, Karahi, Pakistan https://orcid.org/0000-0002-0499-0801

DOI:

https://doi.org/10.29103/joms.v3i1.24428

Keywords:

Copepods, seasonal interval, occurrence, abundance, biodiversity monitoring, coastal water of Pakistan, Arabian Sea

Abstract

This research study reports the first data on seasonal assessment of copepod-specific distribution in Sonmiani Bay. It provides a baseline dataset for future study of planktonic biodiversity in the region by documenting seasonal variations in species-level abundance and related environmental parameters. Zooplanktons were sampled during the high tide with seasonal intervals, i.e., Intermonsoon (April), Southwest monsoon (July), Intermonsoon (October), and Northeast monsoon (January). Physicochemical parameters of water were also recorded in situ on a seasonal basis. A total of 41 copepod species across 23 genera and 17 families were identified, with Calanoida emerging as the dominant order. Centropages dorsispinatus, Subeucalanus crassus, Labidocera pectinata, and Acartia spinicauda showed seasonal dominance during the study period. Principal component analysis (PCA) revealed that water temperature, salinity, and dissolved oxygen were the primary drivers of copepod distribution, with PC1 explaining 37.2% and PC2 24.2% of the total variance (Eigenvalues: 4.09 and 2.66, respectively). The study reveals the ecological importance of copepods within the zooplankton assemblages at Sonmiani Bay and provides baseline data for future biodiversity monitoring and management in the coastal waters of Pakistan.

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References

Abbasi, M. J., Abbasi, Z., Khokhar, F. N., & Siddiqui, P. J. A. (2017). Studies on day-night distribution, composition and abundance of copepod groups in Manora waters along Karachi coast of North Arabian Sea, Pakistan. International Journal of Zoology Studies, 2(1), 83–88.

Al-Aidaroos, A., El-Sherbiny, M., & Mantha, G. (2019). Copepoda—Their status and ecology in the Red Sea. In N. M. A. Rasul & I. C. F. Stewart (Eds.), Oceanographic and biological aspects of the Red Sea (pp. 453–475). Springer. https://doi.org/10.1007/978-3-319-99417-8_25.

Ali, M., & Ahmed, Q. (2013). Diversity and abundance of zooplankton in Shahbunder Creek system of Indus delta. Pakistan Journal of Zoology, 45(6), 1571–1578.

Ali, M., & Ahmed, Q. (2015). Occurrence and abundance of zooplankton in Port Qasim creek system during pre-monsoon period. International Journal of Biology and Biotechnology, 12(1), 123–130.

Ali-Khan, S. (1998). Easy identification sheets. Copepoda: Calanoida F.A.O. Area 51 Western Indian Ocean (Arabian Sea). CEMB Publication, Planktonology #1, University of Karachi.

Al-Yamani, F. Y., Skryabin, V., Gubanova, A., Khvorov, S., & Prusova, I. (2011). Marine zooplankton practical guide. Kuwait Institute for Scientific Research.

Baloch, A., Shah, M., & Narejo, N. T. (2023). Zooplankton diversity and seasonal abundance in Sonmiani Bay, Balochistan coast. Journal of Aquatic Biology, 38(2), 89–102.

Bedford, T., Jones, R., & Smith, L. (2020). Anthropogenic impacts on coastal copepod communities: A global synthesis. Marine Pollution Bulletin, 150, 110728. https://doi.org/10.1016/j.marpolbul.2020.110728.

Branco, C. W. C., Rocha, M. I. F., & Pinto, G. (2007). Seasonal variation of zooplankton community in a tropical coastal lagoon. Brazilian Journal of Biology, 67(2), 251–259. https://doi.org/10.1590/S1519-69842007000200010.

Conway, D. V., White, R. G., Hugues-Dit-Ciles, J., Gallienne, C. P., & Robins, D. B. (2003). Guide to the coastal and surface zooplankton of the southwestern Indian Ocean (Occasional Publication No. 15). Marine Biological Association of the United Kingdom.

Escamilla, E., Zúñiga, L., & Suárez-Morales, E. (2011). Seasonal changes in copepod diversity in a tropical estuary. Crustaceana, 84(4), 435–450.

Gauns, M., Madhupratap, M., Ramaiah, N., Jyothibabu, R., Fernandes, V., Paul, J. T., & Kumar, S. P. (2005). Comparative accounts of biological productivity characteristics and estimates of carbon fluxes in the Arabian Sea and the Bay of Bengal. Deep Sea Research Part II: Topical Studies in Oceanography, 52(14–15), 2003–2017. https://doi.org/10.1016/j.dsr2.2005.05.009.

Hirai, J., Kuriyama, M., & Hidaka, K. (2015). Seasonal variation in copepod community structure in relation to oceanographic conditions in the Kuroshio region. Journal of Plankton Research, 37(5), 914–929. https://doi.org/10.1093/plankt/fbv059.

Hwang, J. S., Kumar, R., Souissi, S., & Hsieh, C. H. (2009). Zooplankton community structure in the East China Sea: Seasonal and spatial patterns analyzed using multivariate statistics. Continental Shelf Research, 29(1), 17–28. https://doi.org/10.1016/j.csr.2008.09.012.

Kasturirangan, L. R. (1963). A key for the identification of the more common planktonic Copepoda of Indian coastal waters (Publs. Counc. Sci. Indust. Res. India, 2). 1–87.

Kiørboe, T. (2011). How zooplankton feed: Mechanisms, traits and trade-offs. Biological Reviews, 86(2), 311–339. https://doi.org/10.1111/j.1469-185X.2010.00148.x.

Kjerfve, B. (1994). Coastal lagoons. In B. Kjerfve (Ed.), Coastal lagoon processes (Vol. 60, pp. 1–8). Elsevier. https://doi.org/10.1016/S0422-9894(08)70006-0.

Kumar, R., Sharma, A., & Singh, P. (2022). Safeguarding marine life: Conservation of biodiversity and ecosystems. Reviews in Fish Biology and Fisheries, 32, 65–100. https://doi.org/10.1007/s11160-022-09700-3.

Kusk, K. O., Wollenberger, L., & Petersen, S. (2007). Effects of pollutants on copepod reproduction and development. Environmental Toxicology and Chemistry, 26(1), 85–91. https://doi.org/10.1897/06-204R.1.

Largo-Wight, E., Truelove, H. B., Rhoden, K., Lowe, N., & Cox, R. (2025). IERE annual report 2025. Annual reports 9. Institute for Environmental Research and Education. https://digitalcommons.unf.edu/ecenter_annual/9/.

Liu, H., Hopcroft, R. R., & Wang, L. (2014). Seasonal dynamics of copepod communities in the northern Gulf of Alaska. Deep Sea Research Part II: Topical Studies in Oceanography, 91, 103–117. https://doi.org/10.1016/j.dsr2.2013.08.004.

Madhu, N. V., Jyothibabu, R., & Balachandran, K. K. (2021). Eutrophication and its impact on coastal zooplankton communities. Marine Ecology Progress Series, 662, 1–18. https://doi.org/10.3354/meps13610.

Madhupratap, M., Gopalakrishnan, T. C., Haridas, P., & Nair, K. K. C. (2001). Mesozooplankton biomass, composition and distribution in the Arabian Sea during the fall intermonsoon: Implications of oxygen gradients. Deep Sea Research Part II, 48(6–7), 1345–1368. https://doi.org/10.1016/S0967-0645(00)00142-9.

Mauchline, J. (1998). The biology of calanoid copepods. Academic Press.

Muniza, F., & Kazmi, Q. B. (2021). Pelagic copepods collected by the North Arabian Sea Naseer Cruise 1. Lap Lambert Academic Publishing.

Nair, V. S., Moorthy, K. K., & Babu, S. S. (2013). Influence of continental outflow and ocean biogeochemistry on the distribution of fine and ultrafine particles in the marine atmospheric boundary layer over Arabian Sea and Bay of Bengal. Journal of Geophysical Research: Atmospheres, 118(13), 7321–7331. https://doi.org/10.1002/jgrd.50535.

Naz, F., Ali, M., & Ahmed, M. (2012). Seasonal variation in mesozooplankton abundance in Phitti Creek, Karachi. Pakistan Journal of Zoology, 44(5), 1321–1328.

Newell, G. E., & Newell, R. C. (1963). Marine plankton: A practical guide. Hutchinson Education.

Noor Muhammad, Hamed, M. H., Nawaz, A., & Mansha, S. (2023). Biodiversity of copepods in marine ecosystem: A review. International Journal of Fisheries and Aquatic Studies, 11(1), 1–6.

Pradhan, Y., Naqvi, S. W. A., & Narvekar, J. (2018). Influence of monsoonal upwelling on copepod dynamics in the eastern Arabian Sea. Continental Shelf Research, 165, 1–12. https://doi.org/10.1016/j.csr.2018.06.003.

Razouls, C., Desreumaux, N., Kouwenberg, J., & de Bovée, F. (2005–2025). Biodiversity of marine planktonic copepods (morphology, geographical distribution and biological data). Sorbonne University, CNRS. http://copepodes.obs-banyuls.fr/en.

Rosa, R., Guerreiro, M., & Lopes, V. M. (2023). Climate-driven changes in copepod distribution in subtropical coastal waters. Global Ecology and Biogeography, 32(1), 112–124. https://doi.org/10.1111/geb.13576.

Saher, N. (2012). Seasonal variation in abundance and composition of zooplankton in mangrove creeks of Karachi (Pakistan northern Arabian Sea). Indian Journal of Marine Sciences, 41(1), 61–69.

Siddiqui, P. J. A., Khokhar, F. N., & Ayub, Z. (2007). Zooplankton dynamics in Sonmiani Bay (Pakistan): Influence of seasonal upwelling and coastal currents. Pakistan Journal of Marine Sciences, 16(1), 25–36.

Turner, J. T. (2004). The importance of small planktonic copepods and their roles in pelagic ecosystems. Zoological Studies, 43(2), 255–266.

Verity, P. G., & Smetacek, V. (1996). Organism life cycles, predation and the structure of marine pelagic ecosystems. Marine Ecology Progress Series, 130, 277–293. https://doi.org/10.3354/meps130277.

Yousuf, F., & Wasee, K. (2006). Diversity, distribution and abundance of zooplanktonic larvae in Pakistani waters. Pakistan Journal of Biological Sciences, 9(4), 610–615. https://doi.org/10.3923/pjbs.2006.610.615.

Zervoudaki, S., Christou, E. D., Assimakopoulou, G., & Frangoulis, C. (2011). Seasonal variability of zooplankton in the Eastern Mediterranean (Aegean Sea): Influence of hydrology and trophic state. Journal of Plankton Research, 33(8), 1235–1250. https://doi.org/10.1093/plankt/fbr034.