Accepted: 25 June 1985.
PRODUCTIVITY OF THE FILAMENTOUS ALGA PITHOPHORA OEDOGONIA (CHLOROPHYTA) IN SURREY LAKE, INDIANA†
Article first published online: 29 OCT 2004
Journal of Phycology
Volume 21, Issue 4, pages 562–569, December 1985
How to Cite
O'Neal, S. W., Lembi, C. A. and Spencer, D. F. (1985), PRODUCTIVITY OF THE FILAMENTOUS ALGA PITHOPHORA OEDOGONIA (CHLOROPHYTA) IN SURREY LAKE, INDIANA. Journal of Phycology, 21: 562–569. doi: 10.1111/j.0022-3646.1985.00562.x
This research was supported by the Office of Water Research and Technology Matching Grant B-119-IND. Purdue University Agricultural Experiment Station Journal Paper No. 9868.
- Issue published online: 29 OCT 2004
- Article first published online: 29 OCT 2004
- algal ecology;
- filamentous algae;
- photosynthetic rates;
Biomass, akinete numbers, net photosynthesis, and respiration of Pithophora oedogonia were monitored over two growing seasons in shallow Surrey Lake, Indiana. Low rates of photosynthesis occurred from late fall to early spring and increased to maximum levels in late spring to summer (29–39 mgO2·g−1 dry wt·h−1). Areal biomass increased following the rise in photosynthesis and peaked in autumn (163–206g dry wt·m−2). Photosynthetic rates were directly correlated with temperature, nitrogen, and phosphorus over the entire annual cycle and during the growing season. Differences in photosynthetic activity and biomass between the two growing seasons (1980 and 1981) were apparently related to higher, early spring temperatures and higher levels of NO3-N and PO4-P in 1981.
Laboratory investigations of temperature and light effects on Pithophora photosynthesis and respiration indicated that these processes were severely inhibited below 15°C. The highest Pmax value occurred at 35°C (0.602 μmol O2·mg−1 chl a·min−1). Rates of dark respiration did not increase above 25°C thus contributing to a favorable balance of photosynthetic production to respiratory utilization at high temperatures. Light was most efficiently utilized at 15°C as indicated by minimum values of Ik(47 μE·m−2·s−1) and Ic (6 μE·m−2·s−1). Comparison of P. oedogonia and Cladophora glomerata indicated that the former was more tolerant of temperatures above 30°C. Pithophora's tolerance of high temperature and efficient use of low light intensity appear to be adaptive to conditions found within the dense, floating algal mats and the shallow littoral areas inhabited by this filamentous alga.