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Marine Ecology Progress Series

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MEPS 441:33-47 (2011)  -  DOI:

In situ production and respiration of the benthic community during emersion on subtropical intertidal sandflats

Li-Hua Lee1,2, Li-Yung Hsieh1,2, Hsing-Juh Lin2,3,*

1Endemic Species Research Institute, Jiji, Nantou 552, Taiwan
2Department of Life Sciences, National Chung Hsing University, Taichung 402, Taiwan
3Biodiversity Research Center, Academia Sinica, Taipei 115, Taiwan

ABSTRACT: In situ benthic community production and respiration during emersion were measured monthly in the course of a 19 mo survey from June 2008 to December 2009 by monitoring CO2 fluxes in benthic chambers on intertidal sandflats of a subtropical coastal wetland. Maximum gross community production (GCPm) and community respiration (CR) all exhibited higher values in summer and fall and lower values in spring and winter. GCPm and CR were positively correlated with air temperature. Temperature coefficients (Q10) showed that a rise of 10°C would increase the GCPm and CR by factors of 3.72 and 4.80, respectively. GCPm was also positively correlated with sediment grain size and negatively correlated with the silt/clay content. CR exhibited a strong positive correlation with sediment chlorophyll a concentration and macrofaunal biomass. To provide an accurate annual budget of benthic production during emersion, corrections were considered for cloudiness and the time lag between emersion and maximum production due to vertical migration of benthic diatoms and variations in CR during nighttime emersion periods. Annual net community production (NCP) during emersion on sandflats was estimated to be 2.87 g C m−2 yr−1, indicating an autotrophic system. However, taking into account the variation in benthic metabolism during immersion, the subtropical intertidal sandflats shifted to a heterotrophic system, and annual NCP was calculated to be −91.47 g C m−2 yr−1.

KEY WORDS: Carbon sink · Gross community production · Community respiration · Net community production · Sediment granulometry · Kaomei Wetland · Taiwan

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Cite this article as: Lee LH, Hsieh LY, Lin HJ (2011) In situ production and respiration of the benthic community during emersion on subtropical intertidal sandflats. Mar Ecol Prog Ser 441:33-47.

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