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Spatio-temporal variability in macrobenthic communities and trophic structure of a tropical estuary and its adjacent coastal waters

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Abstract

Spatio-temporal distribution of the macrobenthic community (> 500 μm) and the trophic ecology of polychaetes were studied for a year in the Cochin estuary (CE) and its adjacent coastal waters. A profound influence of the southwest monsoon (SWM) was evident in the CE, a tropical monsoonal estuary, during the present study. The sediment texture and macrobenthic density exhibited a pronounced spatial variation in the estuary, while in the coastal waters temporal changes were more prominent. Polychaetes formed the dominant taxa in terms of density and diversity in the estuary (53 species belonging to 25 families) as well as in the adjacent coastal waters (39 species belonging to 20 families). The polychaete species Diopatra neapolitana dominated during nonmonsoonal periods was found to be replaced by the higher abundance of Pisione sp. in the CE during the monsoon period. On the other hand, in the coastal waters, Cossura coasta, the dominant species during the pre-monsoon period, was replaced by the surface deposit feeder Paraprionospio pinnata during the monsoon and post-monsoon periods. The study evidenced the combined influence of sediment texture, salinity, and food availability in determining the distribution and abundance of the macrobenthic fauna in the CE and adjacent coastal waters. Feeding guild analysis and trophic importance index showed that carnivores and surface and subsurface deposit feeders were the dominant and trophically important feeding guilds in the study area. Redundancy analysis showed that the sandy substratum supported a diversified functional composition in the estuary and its adjacent coastal waters, and motile, discretely motile polychaetes and filter feeders were more associated with the sandy substratum. Results of the present study revealed that the seasonally fluctuating polychaete community structure in the study area was predominantly controlled by their diversified feeding habits and the ecological descriptors of the polychaete feeding guilds were linked primarily to the substratum type and food availability.

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Acknowledgments

The authors are thankful to the Director, CSIR-National Institute of Oceanography (NIO), Goa, and the Scientist-in-Charge, Regional Centre, CSIR-NIO, Cochin, for the facilities provided during the study period. Funding provided by Cochin Port Trust (CPT), Cochin, is gratefully acknowledged. The first author thanks Council of Scientific & Industrial Research (CSIR) Govt. of India for providing Research Associate funding. Thisis NIO contribution number 6387.

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Rehitha, T.V., Madhu, N.V., Vineetha, G. et al. Spatio-temporal variability in macrobenthic communities and trophic structure of a tropical estuary and its adjacent coastal waters. Environ Monit Assess 191, 341 (2019). https://doi.org/10.1007/s10661-019-7460-x

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