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Effects of semidiurnal tidal circulation on the distribution of holo- and meroplankton in a subtropical estuary.

Hsieh HL, Fan LF, Chen CP, Wu JT, Liu WC - J. Plankton Res. (2010)

Bottom Line: 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.

View Article: PubMed Central - PubMed

Affiliation: Biodiversity Research Center, Academia Sinica, 128 Academia Rd., Sec. 2, Nankang, Taipei 115 , Taiwan.

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.

No MeSH data available.


Density changes (mean ± SE) of spionid larvae, sabellid embryos and larvae, copepods and invertebrate eggs from upstream reaches to the river mouth during the ebb-tide period. Densities with the same italicized letters do not significantly differ using Dunn's test.
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FBQ026F6: Density changes (mean ± SE) of spionid larvae, sabellid embryos and larvae, copepods and invertebrate eggs from upstream reaches to the river mouth during the ebb-tide period. Densities with the same italicized letters do not significantly differ using Dunn's test.

Mentions: The four dominant taxa exhibited spatial and temporal distribution patterns distinct from one another (Figs 4–6 and Table III). Regarding depth distribution, these taxa exhibited no depth gradients, except for the sabellids. Sabellid embryos and larvae had a weak depth tendency (P < 0.05, Table III), having a higher density in subsurface layers than in the surface layer.Table III:


Effects of semidiurnal tidal circulation on the distribution of holo- and meroplankton in a subtropical estuary.

Hsieh HL, Fan LF, Chen CP, Wu JT, Liu WC - J. Plankton Res. (2010)

Density changes (mean ± SE) of spionid larvae, sabellid embryos and larvae, copepods and invertebrate eggs from upstream reaches to the river mouth during the ebb-tide period. Densities with the same italicized letters do not significantly differ using Dunn's test.
© Copyright Policy - creative-commons
Related In: Results  -  Collection

License 1 - License 2
Show All Figures
getmorefigures.php?uid=PMC2864669&req=5

FBQ026F6: Density changes (mean ± SE) of spionid larvae, sabellid embryos and larvae, copepods and invertebrate eggs from upstream reaches to the river mouth during the ebb-tide period. Densities with the same italicized letters do not significantly differ using Dunn's test.
Mentions: The four dominant taxa exhibited spatial and temporal distribution patterns distinct from one another (Figs 4–6 and Table III). Regarding depth distribution, these taxa exhibited no depth gradients, except for the sabellids. Sabellid embryos and larvae had a weak depth tendency (P < 0.05, Table III), having a higher density in subsurface layers than in the surface layer.Table III:

Bottom Line: 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.

View Article: PubMed Central - PubMed

Affiliation: Biodiversity Research Center, Academia Sinica, 128 Academia Rd., Sec. 2, Nankang, Taipei 115 , Taiwan.

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.

No MeSH data available.