Effects of semidiurnal tidal circulation on the distribution of holo- and meroplankton in a subtropical estuary
Resource
JOURNAL OF PLANKTON RESEARCH, 32(6), 829-841
Journal
Journal of Plankton Research
Pages
829-841
Date Issued
2010
Date
2010
Author(s)
Hsieh, Hwey-Lian
Fan, Lan-Feng
Chen, Chang-Po
Wu, Jiunn-Tzong
Liu, Wen-Cheng
Abstract
We examined how tidal changes and which physical factors affected holo- and meroplankton assemblages in a subtropical estuary in Taiwan in February 1999. A factor analysis showed that during tidal flooding, the water mass properties changed from low salinity (5-16) and high particulate organic carbon (POC, 2.6- 4.5 mg L-1) content to increasing salinity and high total suspended matter content (29.0-104.5 mg L-1). With a receding tide, the water became more saline again, and its velocity increased (from non-detectable to 0.67 m s-1). One-way ANOVA showed that the distributions of four dominant taxa were affected by the ebb tide and exhibited two distinct groups. The first group consisted of non-motile invertebrate eggs and weakly swimming polychaete sabellid embryos and larvae (at densities of 1.25-1.40 ind. L -1), while the second consisted of better-swimming copepods and polychaete spionid larvae (at densities of 0.70-1.65 ind. L-1). A canonical correlation analysis demonstrated that the former group occurred at sites with greater freshwater input, higher POC content and greater depth, whereas the latter group was significantly associated with sites subject to seawater and faster flows. We propose that a two-layered circulation process and tidally induced oscillations in water movements might account for the distributional differences between these two groups. © The Author 2010.
Subjects
Holo- and meroplankton distribution; Subtropical estuary; Tidal circulation
Other Subjects
correlation; embryo; estuarine ecosystem; larva; particulate organic carbon; polychaete; population distribution; sea surface salinity; semidiurnal tide; subtropical region; suspended particulate matter; tidal cycle; zooplankton; Taiwan; Copepoda; Invertebrata; Polychaeta; Sabellida; Spionida
Type
journal article
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