Annual Phytoplankton Cycle Research Articles

An annual phytoplankton cycle in the lower Chesapeake Bay : Patten, Bernard C., Richard C. Mulford and J. Ernest Warinner, 1963. Chesapeake Sci., 4 (1): 1–20

An annual phytoplankton cycle in the lower Chesapeake Bay : Patten, Bernard C., Richard C. Mulford and J. Ernest Warinner, 1963. Chesapeake Sci., 4 (1): 1–20

Annual Variations in Length of Copepods in the Sargasso Sea off Bermuda

SUMMARYMeasurements of cephalothorax length were made on the females of five species of oceanic copepods for the period from January 1958 through August 1959. The seasonal length variations of the three species of Pleuromamma (P. piseki, P. abdominalis and P. xiphias) followed the cycle in total phytoplankton. Significant positive correlations were obtained between the mean lengths of P. abdominalis and P. piseki and the mean quantity of phytoplankton of the month previous to sampling, but there was no correlation between length and temperature.The seasonal length variations of females of Haloptilus longicornis and Lucicutia flavicornis differed in pattern from that of the Pleuromamma species and no correlation was found between their mean lengths and the annual cycles of phytoplankton or temperature. These species may feed selectively on some possibly unmeasured fraction of the plankton or on particulate organic matter.Previous work has shown that in waters with a wide temperature range there is a high negative correlation between length and temperature and no correlation between length and phytoplankton. In other regions with an intermediate temperature range the sizes of successive generations of copepods are correlated to almost equal degree with the temperature and the quantity of phytoplankton available during growth. In the Sargasso Sea, where there is a narrow temperature range but a definite seasonal cycle in total phytoplankton, the length variations of the Pleuromamma species are correlated with the phytoplankton cycle and not with temperature.

An Annual Phytoplankton Cycle in the Lower Chesapeake Bay

An annual phytoplankton cycle in lower Chesapeake Bay, Virginia, is described based on data obtained in 1960 on 24 cruises to five stations.

Some Quantitative Aspects of Algal Growth In Lake Mendota

The seasonal fluctuations in the quantities and kinds of phytoplankton in lakes has received the attention of limnologists for many years. For southern Wisconsin lakes, a good general description of the annual phytoplankton cycles of pelagic waters has been presented by Birge and Juday (1922). Causes of these fluctuations have sometimes been explained on the basis of the levels of chemical nutrients, especially phosphorus and nitrogen compounds, which are present in natural waters, though few generalizations of real or supposed biological and chemical relationships have thus far had wide application. At the present only a limited amount of information has been gained from experimental algal cultures which can be applied directly toward an understanding of the usually different conditions existing in various natural waters. The experiments of Chu (1942), Rodhe (1948), and Gerloff, Fitzgerald, and Skoog