Czech Phycology 2: 83-92, 2002

Periphyton composition change along the phosphorus gradient in the Florida Everglades [in Czech]

Změny složení nárostů v závislosti na koncentraci fosforu ve floridských Everglades

Jan Vymazal1, Jaroslava Komárková2, Klára Kubečková2, Jan Kaštovský2
1 Říčanova 40, CZ-169 00 Praha 6
2 Hydrobotanický ústav AV ČR, Na Sádkách 7,CZ-370 01 České Budějovice

Water Conservation Area 2A of the northern Everglades is the remnant of the vast sawgrass slough marsh that once stretched from Lake Okeechobee to the southern tip of Florida peninsula. WCA-2A covers an area of 450 km2 and is surrounded by dikes. Water draining from agricultural areas in the Hillsboro Canal is periodically allowed to flow into WCA-2A through four water control gates on the northeast side. WCA-2A is periodically drained through gates on the southern side. These inputs of nutrient-laden water through the control gates for over 25 years have created a nutrient enrichment gradient in WCA-2A extending roughly north-to-south for 3-5 kilometres. Six plots were established along each of three transects running south from gates 10-A, 10-C and 10-D in 1990. The transects (north to south) were roughly parallel to the dominant water flow from the drainage canal gates located on the southern side of the Hillsboro Canal. Our present study was conducted along the C-transect. The distance of sampling points C1 to C6 from Hillsboro Canal was 0.68, 2.40, 4.09, 6.14, 7.99 and 9.84 km, respectively.
A total of 207 algal and cyanoprokaryotic species were found along C-transect nutrient gradient. The most species belong to Cyanoprokaryota (96), Bacillariophyceae (59), Conjugatophyceae (25) and Chlorophyceae (22). The highest value of fresh biomass was recorded at site C2; this value was significantly higher as compared to all other sites. The periphyton species composition changes along the transect. Sites C1 and C2, i.e., sites with the highest P concentrations, were dominated by filamentous Cyanoprokaryota (namely <span style="font-style: italic;">Lyngbya and <span style="font-style: italic;">Phormidium) and green algae (e.g. <span style="font-style: italic;">Spirogyra spp, <span style="font-style: italic;">Mougeotia spp. and <span style="font-style: italic;">Oedogonium spp.). Sites C5 and C6, i.e., unimpacted sites, were dominated by diatoms (namely <span style="font-style: italic;">Mastogloia smithii, <span style="font-style: italic;">Nitzschia linearis, <span style="font-style: italic;">Rhopalodia gibba).

Published: March 1, 2002  Show citation

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Vymazal, J., Komárková, J., Kubečková, K., & Kaštovský, J. (2002). Periphyton composition change along the phosphorus gradient in the Florida Everglades [in Czech]. Czech Phycology, 2(1), 83-92
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    References

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