Animal traces on a tidal flat in Hangzhou Bay,China |
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| Institution: | 1. Netherlands Institute for Sea Research, P.O. Box 59, 1790 AB Den Burg, Texel, The Netherlands;2. Institute of Estuarine and Coastal Research, East China Normal University, Shanghai, China;1. Departamento de Geología, Universidad Nacional de Río Cuarto, X5804BYA Río Cuarto, Argentina;2. Consejo Nacional de Investigaciones Científicas y Técnicas, Argentina;3. Department of Earth and Space Sciences, University of Washington, Seattle, WA 98195-1310, USA;4. Departamento de Geología Básica, Facultad de Ciencias Exactas, Físicas y Naturales, Universidad Nacional de Córdoba, Av. Vélez Sársfield 1611, Ciudad Universitaria, Córdoba X5016GCA, Argentina;1. Laboratoire de Physique des Matériaux Lamellaires et Nanomatériaux Hybrides, Faculté des Sciences de Bizerte, Université de Carthage, Zarzouna 7021, Tunisia;2. Instituto Ciencia de Materiales, CSIC, c. Sor Juana Inés de la Cruz, 3. Cantoblanco, 28049 Madrid, Spain |
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| Abstract: | Despite prevailing low salinity (S ranging from 1 to 10) of the Hangzhou Bay, its extensive (up to 2 km wide) flats along the northern coast have a species-rich macrobenthic fauna of crustaceans, bivalves, gastropods and polychaetes. These produce a variety of crawling, feeding, dwelling and resting traces, some comparable to those observed on the flats of Korea and Taiwan. The characteristic starlike feeding traces of the bivalve Tellina (Moerella) iridescens are described here for the first time. Sediment reworking appears to be largely confined to the surface layer. The burrow-inhabiting crabs are also mainly surface sediment feeders. These Chinese flats lack organisms reworking deeper sediment layers such as lugworms or callianassid crustaceans. As compared to the Wadden Sea, sedimentation rate is higher and subsurface sediment reworking less intense, resulting in relatively few bioturbation structures in vertical sections of the Hangzhou tidal flat sediments. |
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