Abstract
Monthly abundance of the subclass Copepoda was analyzed from the zooplankton samples collected at Obhur Creek, Jeddah, Saudi Arabia during December-2011 till December-2012. Zooplankton samples were collected through surface horizontal tows by a modified WP2 net (via. mouth diameter 50 cm, length 180 cm, 150 μm mesh size). Order Calanoida dominated the abundance with mean annual average of 75.29%. We observed abnormal protuberances on copepods, known as tumour-like anomalies (TLAs). Calanoida showed more frequent and prominent TLAs on its dorsal surface with highest mean percentage occurring during Jun. 2012 (1.64%). The percentage prevalence of TLAs on the Copepoda was highest during Jun. 2012 (1.36%) and least during Nov. 2012 (0.03%). It is suggested that these TLAs might be caused due to the presence of potentially high levels of toxic substances, which weakens the exoskeleton and thereby making them more susceptible to infections or due to wounds from parasites or might be related to the occurrence of symbiotic tantulocarids or might be due to the radiation stress as a control measure. Whatever the reason, these TLAs have become a serious emerging threat to the aquatic food web. Our investigation is the first of its kind in the coastal waters of the Saudi Red Sea, which needs further investigations in order to elucidate the possible reasons for these abnormalities.
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This project was funded by the Deanship of Scientific Research (DSR) at King Abdulaziz University under grant (No. G-389-150-36). The authors, therefore, acknowledge DSR for technical and financial support.
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Al-Aidaroos, A.M., Mantha, G. First Report of Tumor-Like Anomalies on the Copepods and their Seasonality from the Obhur Creek, Jeddah Coast, Central Red Sea. J. Ocean Univ. China 17, 659–666 (2018). https://doi.org/10.1007/s11802-018-3329-9
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DOI: https://doi.org/10.1007/s11802-018-3329-9