Implications of an extensive salt water barrage on the distribution of black clam in a tropical estuarine system, Southwest coast of India

• Autorzy: Nagarathinam Arunpandi , Retnamma Jyothibabu , Loganathan Jagadeesan , Singaram Parthasarathi , Madam Savitha Mohanan Kannampally , Jose Albin Konnakkamannil , Subramanian Pandiyarajan Rethinam

Identyfikatory

DOI

10.1016/j.oceano.2021.03.005

• Języki publikacji: EN

Abstrakty

EN

Based on a monthly field sampling over a year in the Kochi backwaters (KBW), this study presents the larval ecology of black clam and discusses how an extensive saltwater barrage [Thannermukkom barrage (TB)] impacted the natural black clam resource distribution. Spatial variations in salinity were found minimal during the Southwest Monsoon (June-September) due to the predominance of the freshwater associated with heavy monsoonal rainfall. Conversely, significant spatial changes in salinity were evident during the Pre-Southwest Monsoon (March-May) and Post-Southwest Monsoon (October-February). Monthly sampling exercises revealed that the black clam stock in the KBW breeds throughout the year, as their larvae were found (8 indiv. m^-3 -494 indiv. m^-3) in all the locations. This observation is the modification of the traditional belief that black clam in the KBW breeds only twice a year. Mesohaline condition (salinity 5-18) is the most conducive for peak spawning and larval production. There were two peaks of larval production in the KBW over a year, mainly associated with the prevalence of the optimum salinity conditions on different spatial scales. The closing of the TB after the Southwest Monsoon (September) causes shrinkage of the area of the oligohaline and mesohaline conditions, the most conducive environment for the peak spawning and larval production of black clam in the KBW. This study presents a clear case of how human alterations of the natural environment impact valuable biological resources, which may apply to many similar aquatic ecosystems across the globe.

Słowa kluczowe

EN

black clam; larvae; spawning; saltwater barrage; KBW; Kochi backwaters

• Wydawca: Polish Academy of Sciences, Institute of Oceanology ; Elsevier
• Czasopismo: Oceanologia
• Rocznik: 2021
• Tom: No. 63 (3)
• Strony: 343--355
• Opis fizyczny: Bibliogr. 50 poz., fot., map., rys., tab., wykr.

Twórcy

autor

Nagarathinam Arunpandi

• CSIR — National Institute of Oceanography, Regional Centre, Kochi, India

autor

Retnamma Jyothibabu

• CSIR — National Institute of Oceanography, Regional Centre, Kochi, India

autor

Loganathan Jagadeesan

• CSIR — National Institute of Oceanography, Regional Centre, Kochi, India
• CSIR — National Institute of Oceanography, Regional Centre, Visakhapatnam, India

autor

Singaram Parthasarathi

• CSIR — National Institute of Oceanography, Regional Centre, Kochi, India

autor

Madam Savitha Mohanan Kannampally

• CSIR — National Institute of Oceanography, Regional Centre, Kochi, India

autor

Jose Albin Konnakkamannil

• CSIR — National Institute of Oceanography, Regional Centre, Kochi, India

autor

Subramanian Pandiyarajan Rethinam

• CSIR — National Institute of Oceanography, Regional Centre, Kochi, India

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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2021).