OSD Ocean Science Discussions OSD Ocean Sci. Discuss. 1812-0822 Göttingen, Germany 10.5194/osd-9-1853-2012 Temporal and spatial distribution of the meiobenthic community in Daya Bay, South China Sea Tang L. 2 1 Li H. X. 1 Yan Y. 1 CAS Key Laboratory of Marine Bio-resources Sustainable Utilization, Guangzhou 510301, China Graduate University of Chinese Academy of Sciences, Beijing 10039, China 24 04 2012 9 2 1853 1885 Copyright: © 2012 L. Tang et al. 2012 This work is licensed under the Creative Commons Attribution 3.0 Unported License. To view a copy of this licence, visit https://creativecommons.org/licenses/by/3.0/ This article is available from https://os.copernicus.org/preprints/9/1853/2012/osd-9-1853-2012.html The full text article is available as a PDF file from https://os.copernicus.org/preprints/9/1853/2012/osd-9-1853-2012.pdf

Spatial and temporal biodiversity patterns of the meiobenthos were studied for the first time in Daya Bay, which is a tropical semi-enclosed basin located in the South China Sea. The abundance, biomass, and composition of the meiobenthos and the basic environmental factors in the bay were investigated. The following 19 taxonomic groups were represented in the meiofauna: Nematoda, Copepoda, Polychaeta, Oligochaeta, Kinorhyncha, Gastrotricha, Ostracoda, Bivalvia, Turbellaria, Nemertinea, Sipuncula, Hydroida, Amphipoda, Cumacea, Halacaroidea, Priapulida, Echinodermata, Tanaidacea, and Rotifera. Total abundance and biomass of the meiobenthos showed great spatial and temporal variation, with mean values of 993.57 &plusmn; 455.36 ind cm<sup>&minus;2</sup> and 690.51 &plusmn; 210.64 μg 10 cm<sup>−2</sup>, respectively. Nematodes constituted 95.60 % of the total abundance and thus had the greatest effect on meiofauna quantity and distribution, followed by copepods (1.55 %) and polychaetes (1.39 %). Meiobenthos abundance was significantly negatively correlated with water depth at stations (<i>r</i>=&minus;0.747, <i>P</i><0.05) and significantly negatively correlated with silt-clay content (<i>r</i>=&minus;0.516, <i>P</i><0.01) and medium diameter (<i>r</i>=&minus;0.499, <i>P</i><0.01) of the sediment. Similar results were found for correlations of biomass and abundance of nematodes with environmental parameters. Polychaete abundance was positively correlated with the bottom water temperature (<i>r</i>=0.456, <i>P</i><0.01). Meiobenthos abundance differed significantly among seasons (<i>P</i><0.05), although no significant difference among stations and the interaction of station × season was detected by two-way ANOVA. In terms of vertical distribution, most of the meiobenthos was found in the surface layer of sediment. This pattern was apparent for nematodes and copepods, but a vertical distribution pattern for polychaetes was not as obvious. Based on the biotic indices and analyses of their correlations and variance, the diversity of this community was likely to be influenced by environmental variations.

 References Armenteros, M., Ruiz-Abierno, A., Fernández-Garcés, R., Pérez-Garc\'{i}a, J. A., D\'{i}az-Asencio, L., Vincx, M., and Decraemer, W.: Biodiversity patterns of free-living marine nematodes in a&nbsp;tropical bay: Cienfuegos, Caribbean Sea, Estuar. Coast. Shelf. S., 85, 179–189, 2009. Blanchard,&nbsp;G.&nbsp;F.: Measurement of meiofauna grazing rates on microphytobenthos: is primary production a&nbsp;limiting factor?, J. Exp. Mar. Biol. Ecol., 147, 37–46, 1991. Boucher,&nbsp;G.: Structure and biodiversity of nematode assemblages in the SW lagoon of New Caledonia, Coral Reefs, 16, 177–186, 1997. Branch,&nbsp;G.&nbsp;M. and Pringle,&nbsp;A.: The impact of the sand prawn <i>Callianassa kraussi</i> Stebbing on sediment turnover and on bacteria, meiofauna and benthic microflora, J. Exp. Mar. Biol. Ecol., 107, 219–235, 1987. Christian,&nbsp;N., Renzo,&nbsp;P., and Gugielmo,&nbsp;T.: Seasonal dynamics of meiofauna in a&nbsp;South African temporarily open/closed estuary (Mdloti Estuary, Indian Ocean), Estuar. Coast. Shelf. S., 62, 325–338, 2005. Churchill,&nbsp;J.&nbsp;H.: The effect of commercial trawling on sediment resuspension and transport over the Middle Atlantic Bight continental shelf, Cont. Shelf Res. 9, 841–864, 1989. Clarke,&nbsp;K.&nbsp;R.: Non-parametric multivariate analyses of changes in community structure, Austral. J. Ecol., 18, 117–143, 1993. Clarke,&nbsp;K.&nbsp;E. and Gorley,&nbsp;R.&nbsp;N.: PRIMER v6: User Manual/Tutorial, PRIMER-E, Plymouth, 2006. Coull,&nbsp;B.&nbsp;C.: Role of meiofauna in estuarine soft-bottom habitats, Austral. J. Ecol., 24, 327–343, 1999. Coull,&nbsp;B.&nbsp;C. and Chandler,&nbsp;G.&nbsp;T.: Meiobenthos, Encycl. Ocean Sci., 3, 1705–1711, 2001. Danovaro,&nbsp;R. and Gambi,&nbsp;C.: Biodiversity and trophic structure of nematode assemblages in seagrass systems: evidence for a&nbsp;coupling with changes in food availability, Mar. Biol., 141, 667–677, 2002. Danovaro,&nbsp;R., Gambi,&nbsp;C., Manini,&nbsp;E., and Fabiano,&nbsp;M.: Meiofauna response to a&nbsp;dynamic river plume front, Mar. Biol., 137, 359–370, 2000. El-Wakeel,&nbsp;S.&nbsp;K. and Riley,&nbsp;J.&nbsp;P.: The determination of organic carbon in marine muds, J. Couns. Int. Explor., 22, 180–183, 1957. Fenchel,&nbsp;T.&nbsp;M. and Riedl,&nbsp;R.&nbsp;J.: The sulfide system: a&nbsp;new biotic community underneath the oxidized layer of marine sand bottoms, Mar. Biol., 7, 255–268, 1970. Findlay,&nbsp;S.&nbsp;E.&nbsp;G.: Influence of sampling scale on apparent distribution of meiofauna on a&nbsp;sandflat, Estuaries, 5(4), 322–324, 1982. Galtsova,&nbsp;V.&nbsp;V.: Meiobenthos in marine ecosystems, in: Example of Free-Living Nematodes, Zoological Institute, USSR Academy of Sciences, Leningrad, 240 pp., 1991 (in Russian). Gee,&nbsp;J.&nbsp;M.: Managing the health of seafloor, Front. Ecol. Environ., 1, 429–436, 1989. Gerlach,&nbsp;S.&nbsp;A.: On the importance of marine meiofauna for benthos communities, Oecologia, 6, 176–190, 1971. Giere,&nbsp;O.: Meiobenthology – The Microscopic Fauna in Aquatic Sediments. Springer Verlag, Berlin, Heidelberg, 1993. Veit-Köhler, Gritta, Laudien, J., Knott, J., Velez, J., and Sahade, R.: Meiobenthic colonization of soft sediments in arctic glacial Kongsfjorden (Svalbard), J. Exp. Mar. Biol. Ecol., 363, 58–65, 2008. Heip,&nbsp;C., Vincx,&nbsp;M., and Vranken,&nbsp;G.: The ecology of marine nematodes, Oceanogr. Mar. Biol. Ann. Rev., 23, 399–489, 1985. Higgins,&nbsp;R. and Thiel,&nbsp;H.: Introduction to the Study of Meiofauna, Smithsonian Inst. Press, Washington DC, London, 350, 1988. Huang,&nbsp;Y., Zhang,&nbsp;Z., and Liu,&nbsp;X.: Studies on the community structures of meiofauna and marine nematode at six stations in the Southern Yellow Sea, China, J. Ocean Univ. China, 4(1), 34–42, 2005. Jansson,&nbsp;B.: The availability of oxygen for interstitial fauna of sandy beaches, J. Exp. Mar. Biol. Ecol., 1, 123–143, 1967. Kim,&nbsp;D.&nbsp;S., Je,&nbsp;J.&nbsp;G., and Lee,&nbsp;J.&nbsp;H.: The community structure and spatial distribution of meiobenthos in the Kanghwa tidal flat, west coast of Korea, Ocean Res., 22(1), 15–23, 2000. Li,&nbsp;J., Lu,&nbsp;S., and Liang,&nbsp;S.: Relationship between nutrients and red tide algae in Daya Bay and Dapeng Bay, Mar. Sci. Bull., 2(2), 23–29, 1993. Liu,&nbsp;X.&nbsp;S.: Response of Meiofauna with Special Reference to Nematodes upon Recovery from Anthropogenic Activities in Subtropical Waters of Hong Kong, City University of Hong Kong, Hong Kong, 2009. Liu,&nbsp;X.&nbsp;S., Xu,&nbsp;W.&nbsp;Z., Cheung,&nbsp;S.&nbsp;G., and Shin, P. K. S.: Response of meiofaunal community with special reference to nematodes upon deployment of artificial reefs and cessation of bottom trawling in subtropical waters, Hong Kong, Mar. Pollut. Bull., 2010.11.019, 2010. de Madron,&nbsp;X.&nbsp;D., Ferre,&nbsp;B., Le Corre,&nbsp;G., Grenz,&nbsp;C., Conan,&nbsp;P., Pujo-Pay,&nbsp;M., Buscail,&nbsp;R., and Bodiot,&nbsp;O.: Trawling-induced resuspension and dispersal of muddy sediments and dissolved elements in the Gulf of Lion (NW Mediterranean), Cont. Shelf Res., 25, 2387–2409, 2005. Mayer,&nbsp;L.&nbsp;M., Schick,&nbsp;D.&nbsp;F., Findlay,&nbsp;R.&nbsp;H., and Rice,&nbsp;D.&nbsp;L.: Effects of commercial dragging on sedimentary organic matter, Mar. Environ. Res., 31, 249–261, 1991. Moens,&nbsp;T. and Vincx,&nbsp;M.: Temperature and salinity constraints on the life cycle of two brackish-water nematode species, J. Exp. Mar. Biol. Ecol., 243, 115–135, 2000a. Moens,&nbsp;T. and Vincx,&nbsp;M.: Temperature, salinity and food thresholds in two brackish-water bacterivorous nematode species: assessing niches from food absorption and respiration experiments, Mar. Ecol. Progress Ser., 53, 137–154, 2000b. Nozais,&nbsp;C., Perissinotto,&nbsp;R., and Mundree,&nbsp;S.: Annual cycle of microalgal biomass in a&nbsp;South African temporarily-open estuary: nutrient versus light limitation, Marine Ecol. Progress Ser., 223, 39–48, 2001. Olafsson,&nbsp;E.: Elmgren. Seasonal dynamics of sublittoral meiobenthos in relation of phytoplankton sedimentation in the Baltic Sea, Estuar. Coast. Shelf S., 45, 149–164, 1997. Olga,&nbsp;N.&nbsp;P.: Diurnal migrations of meiofauna in the sediments of sand bank of the Popov Island, the Sea of Japan, Russian&nbsp;J. Mar. Biol., 5, 64–65, 1984. Olga,&nbsp;N.&nbsp;P. and Julia,&nbsp;A.&nbsp;T.: Meiobenthos in Nha Trang Bay of the South China Sea (Vietnam), Ocean Sci. J., 41(3), 139–148, 2006. Olga,&nbsp;N.&nbsp;P., Yulia,&nbsp;T., Nguyen,&nbsp;V.&nbsp;T., and Nguyen,&nbsp;D.&nbsp;T.: Meiobenthos in Estuary Part of Ha Long Bay (Gulf of Tonkin, South China Sea, Vietnam), Ocean Sci. J., 43(3), 153–160, 2008. Palanques,&nbsp;A., Guillen,&nbsp;J., and Puig,&nbsp;P.: Impact of bottom trawling on water turbidity and muddy sediment of an unfished continental shelf, Limnol. Oceanogr., 46, 1100–1110, 2001. Pavlyuk,&nbsp;O.&nbsp;U.: Diurnal migrations of migrations of meiofauna in the sediments of sand bank of the popov Island, the Sea of Japan, Russian&nbsp;J. Mar. Biol., 5, 64–65, 1984. Pavlyuk,&nbsp;O.&nbsp;N., Preobrazhenskaya,&nbsp;T.&nbsp;V., and Tarasova,&nbsp;T.&nbsp;S.: Annual changes in meiobenthos community structure in Alekseev Bight, Sea of Japan, Russian&nbsp;J. Mar. Biol., 27(2), 105–110, 2001. Pilskaln,&nbsp;C.&nbsp;H., Churchill,&nbsp;J.&nbsp;H., and Mayer,&nbsp;L.&nbsp;M.: Resuspension of sediment by bottom trawling in the Gulf of Maine and potential geochemical consequences, Conserv. Biol., 12, 1223–1229, 1998. Raffaelli,&nbsp;D.&nbsp;G. and Mason,&nbsp;C.&nbsp;F.: Pollution monitoring with meiofauna, using the ratio of nematode to copepod, Mar. Pollut. Bull., 12, 158–163, 1981. Schratzberger,&nbsp;M., Whomersley,&nbsp;P., Warr,&nbsp;K., Bolam,&nbsp;S.&nbsp;G., and Rees,&nbsp;H.&nbsp;L.: Colonisation of various types of sediment by estuarine nematodes via lateral infaunal migration: a&nbsp;laboratory study, Mar. Biol., 145, 69–78, 2004. Song,&nbsp;X. Y., Huang,&nbsp;L. M., Zhang,&nbsp;J. L., Huang, X. P., Zhang, J. B., Yin, J. Q., Tan, Y. H., and Liu, S.: Variation of phytoplankton biomass and primary production in Daya Bay during spring and summer, Marine Pollut. Bull., 49, 1036–1044, 2004. Thiel,&nbsp;H.: Benthos in upwelling regions, in: Upwelling Ecosystems, edited by: Boje,&nbsp;R. and Thomczak,&nbsp;M., Springer, Berlin, 124–138, 1978. Veit-Kăhler,&nbsp;G., Laudien,&nbsp;J., Knott,&nbsp;J., Velez,&nbsp;J., and Sahade,&nbsp;R.: Meiobenthic colonization of soft sediments in arctic glacial Kongsfjorden (Svalbard), J. Exp. Mar. Biol. Ecol., 363, 58–65, 2008. Wang,&nbsp;Y.&nbsp;S., Lou,&nbsp;Z.&nbsp;P., Sun,&nbsp;C.&nbsp;C., and Sun,&nbsp;S.: Ecological environment changes in Daya Bay, China, from 1982 to 2004, Marine Pollut. Bull., 56, 1871–1879, 2008. Wang,&nbsp;Y.&nbsp;S., Lou,&nbsp;Z.&nbsp;P., Sun,&nbsp;C.&nbsp;C., Wu,&nbsp;M.&nbsp;L., and Han,&nbsp;S.&nbsp;H.: Multivariate statistical analysis of water quality and phytoplankton characteristics in Daya Bay, China, from 1999 to 2002, Oceanologia, 48, 193–211, 2006. Welschmeyer,&nbsp;N.&nbsp;A.: Fluorometric analysis of chlorophyll-<i>a</i> in the presence of chlorophyll-<i>a</i> and pheopigments, Limnol. Oceanogr., 39, 1985–1992, 1994. Widbom,&nbsp;B.: Determination of average individual dry weight and ash-free dry weight in different sieve fractions of marine meiofauna, Marine Biol., 84, 101–108, 1984. Wiseman,&nbsp;J.&nbsp;D.&nbsp;H. and Bennette,&nbsp;H.&nbsp;E.: Distribution of organic matter and nitrogen in the sediments from the Arabian Sea, John Murray Exp., 3, 221, 1960. Wu,&nbsp;M.&nbsp;L. and Wang,&nbsp;Y.&nbsp;S.: Using chemometrics to evaluate anthropogenic effects in Daya Bay, China, Estuar. Coast. Shelf S., 72, 732–742, 2007. Xu,&nbsp;G.&nbsp;Z.: Environments and Resources of Daya Bay, Anhui Science Publishing House, HeFei, China, 1989. Xu,&nbsp;N., Chen,&nbsp;J., Wang,&nbsp;Z., Huang,&nbsp;W., Xie,&nbsp;L., and Qi,&nbsp;Y.: Dynamic analyses on algal bloom events in Daya Bay of Guangdong. A&nbsp;study of relationship between algal bloom and nutrients, Acta Sci. Circum. (Huanjing Kexue Xue bao), 21, 400–404, 2001a (in Chinese with English Abstr.). Xu,&nbsp;N., Chen,&nbsp;J.&nbsp;F., Wang,&nbsp;Z.&nbsp;H., Wang,&nbsp;Y., Huang,&nbsp;W., and Qi,&nbsp;Y.&nbsp;Z.: Dynamic analyses on several algal bloom events in Daya Bay of Guangdong&nbsp;I. Process of algal bloom and its relationship with environmental factors, Mar. Environ. Sci., 20(1), 1–12, 2001b. Zhang,&nbsp;Z.&nbsp;N., Zhou,&nbsp;H., Guo,&nbsp;Y.&nbsp;O., and Mu,&nbsp;F.&nbsp;H.: Comparative study of the nematode community structure in the submarine delta of Huanghe River estuary and its adjacent waters, Oceanol. Limnol. Sinica, 32(4), 436–444, 2001a. Zhang,&nbsp;Z.&nbsp;N., Zhou,&nbsp;H., Yu,&nbsp;Z.&nbsp;S., Han,&nbsp;J.: Abundance and biomass of the benthic meiofauna in the northern soft-bottom of the Jiaozhou Bay, Oceanol. Liminol. Sinica, 32, 139–147, 2001b (in Chinese, with English Abstr.). Zhang,&nbsp;Z.&nbsp;N., Mu,&nbsp;F.&nbsp;H., Yu,&nbsp;Z.&nbsp;S., and Zhou,&nbsp;H.: Abundance and biomass of the benthic meiofauna in the spawning group of anchovy (<i>Engraulis japonicus</i>) in the Southern Yellow Sea, China, J. Ocean Univ. Qingdao, 32(2), 251–258, 2002.