The Survey Data of Benthic Diatoms in Anping historical waterview park

Study Extent

The Anping Historical Waterview Park in Tainan, Taiwan, (120°15'21.81'' E, 22°00'00.84'' N) served as the sampling location for this study.

Sampling

1.Culture of benthic diatoms Eight diatom boards (transparent acrylic boards measuring 15 × 15 cm²) were placed on each of the three AFIs on October 16, 2017. Subsequently, sampling processes were conducted on October 23, October 31, November 20, and November 30, 2017, with the culture period being 7, 15, 35, and 45 days, respectively. 2.Sampling of benthic diatoms On each sampling date, two of the diatom boards were removed from the AFIs; specifically, a total of six boards were retrieved on each sampling session. The retrieved boards were covered with tin-foil paper for shading, after which they were sent to the laboratory under refrigeration. The benthic diatoms were then scraped off using toothbrushes. 3.Sampling of planktonic diatoms For comparison with the benthic diatoms, this study sampled the water near the Historical Waterview Park regions in which the diatom boards were placed. The collected water samples were subjected to centrifugation, acid washing, and fixation in the laboratory. Subsequently, observation and identification processes were conducted on the water samples.

Method steps

1. All the diatom fluids were first concentrated in a centrifugal machine for 10 minutes at 3,500 rpm; the fresh diatoms were then observed using a differential interference contrast microscope. Subsequently, acid washing was conducted using concentrated sulfuric acid, after which observation and identification processes were performed using an electron microscope.

1. Achnanthes
   rank: genus
2. Achnanthidium
   rank: genus
3. Planothidium
   rank: genus
4. Nitzschia
   rank: genus
5. Psammodictyon
   rank: genus
6. Biddulphia
   rank: genus
7. Amphora
   rank: genus
8. Cocconeis
   rank: genus
9. Campylosira
   rank: genus
10. Diploneis
    rank: genus
11. Encyonema
    rank: genus
12. Licomophora
    rank: genus
13. Gyrosigma
    rank: genus
14. Haslea
    rank: genus
15. Navicula
    rank: genus
16. Seminavis
    rank: genus
17. Plagiotropis
    rank: genus
18. Pleurosigma
    rank: genus
19. Gomphonemopsis
    rank: genus
20. Skeletonema
    rank: genus
21. Cyclotella
    rank: genus
22. Thalassiosira
    rank: genus

The Anping Historical Waterview Park in Tainan, Taiwan, (120°15'21.81'' E, 22°00'00.84'' N) served as the sampling location for this study. The park has a water area of approximately 6 km² and water depth of 3 m. The southern portion of the park is connected to the Anping harbor area and the Tainan Canal; the northern portion comprises the Yanshui River basin and estuary.