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PRODUCTIVITY OF THE FILAMENTOUS ALGA PITHOPHORA OEDOGONIA (CHLOROPHYTA) IN SURREY LAKE, INDIANA 1
Author(s) -
O'Neal Steven W.,
Lembi Carole A.,
Spencer David F.
Publication year - 1985
Publication title -
journal of phycology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.85
H-Index - 127
eISSN - 1529-8817
pISSN - 0022-3646
DOI - 10.1111/j.0022-3646.1985.00562.x
Subject(s) - photosynthesis , biology , respiration , biomass (ecology) , productivity , zoology , botany , photoinhibition , respiration rate , phosphorus , cladophora , light intensity , chlorophyta , algae , horticulture , photosystem ii , agronomy , chemistry , physics , organic chemistry , optics , economics , macroeconomics
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 mgO 2 ·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 NO 3 ‐N and PO 4 ‐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 P max value occurred at 35°C (0.602 μmol O 2 ·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 I k (47 μE·m −2 ·s −1 ) and I c (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.