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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.


Ordinations and relationships among the four taxa (spionid larvae, sabellid embryos and larvae, copepods and invertebrate eggs) and four environmental parameters (depth, flow velocity, particulate organic carbon content and salinity) by the first two canonical variables using a canonical correlation analysis.
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FBQ026F7: Ordinations and relationships among the four taxa (spionid larvae, sabellid embryos and larvae, copepods and invertebrate eggs) and four environmental parameters (depth, flow velocity, particulate organic carbon content and salinity) by the first two canonical variables using a canonical correlation analysis.

Mentions: The first two canonical correlations between the four dominant taxa and four environmental parameters were both significant, and explained 60.0 and 25.1% of the total variance, respectively (r1 = 0.71, approx. F(16,50) = 2.56, P = 0.01; r2 = 0.54, approx. F(9, 42) = 1.98, P = 0.07; Fig. 7). In the first canonical variable, the densities of sabellid embryos and larvae, and invertebrate eggs were positively correlated with the water depth and POC content but negatively correlated with salinity. In the second canonical variable, the densities of copepods and spionid larvae were positively correlated with salinity and flow velocity but negatively correlated with the POC content (Fig. 7).


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)

Ordinations and relationships among the four taxa (spionid larvae, sabellid embryos and larvae, copepods and invertebrate eggs) and four environmental parameters (depth, flow velocity, particulate organic carbon content and salinity) by the first two canonical variables using a canonical correlation analysis.
© Copyright Policy - creative-commons
Related In: Results  -  Collection

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

FBQ026F7: Ordinations and relationships among the four taxa (spionid larvae, sabellid embryos and larvae, copepods and invertebrate eggs) and four environmental parameters (depth, flow velocity, particulate organic carbon content and salinity) by the first two canonical variables using a canonical correlation analysis.
Mentions: The first two canonical correlations between the four dominant taxa and four environmental parameters were both significant, and explained 60.0 and 25.1% of the total variance, respectively (r1 = 0.71, approx. F(16,50) = 2.56, P = 0.01; r2 = 0.54, approx. F(9, 42) = 1.98, P = 0.07; Fig. 7). In the first canonical variable, the densities of sabellid embryos and larvae, and invertebrate eggs were positively correlated with the water depth and POC content but negatively correlated with salinity. In the second canonical variable, the densities of copepods and spionid larvae were positively correlated with salinity and flow velocity but negatively correlated with the POC content (Fig. 7).

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.