. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 274 R. H BREWER Mature ^•Blastulae H!'IJ[j]) Deterioration. I960 1979 1973 February March April May June July Figure 1. The seasonal occurrence and characteristics of Cyanea medusae in the Niantic River estuary, 1973-1986. Solid triangles indicate sample dates. Sampling was less frequent, 1973-1979, and the pattern shown represents the average for those years. and exumbrellar epithelium, only the mesoglea remains. Even in an early deteriorated state, the medusae cannot feed (see below). Medusae, in one or another stage, occu
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 274 R. H BREWER Mature ^•Blastulae H!'IJ[j]) Deterioration. I960 1979 1973 February March April May June July Figure 1. The seasonal occurrence and characteristics of Cyanea medusae in the Niantic River estuary, 1973-1986. Solid triangles indicate sample dates. Sampling was less frequent, 1973-1979, and the pattern shown represents the average for those years. and exumbrellar epithelium, only the mesoglea remains. Even in an early deteriorated state, the medusae cannot feed (see below). Medusae, in one or another stage, occur for about 4 months each year before they disappear. The average last date to find deteriorated medusae in the plankton is 29 June. The small annual variation in the occurrence of the different medusa stages is paralleled by the nearly con- stant population size of Cyanea. The comparison of their peak annual abundance (Fig. 2) shows that the maxi- mum abundance of medusae (always occurring between late April and mid-May) alternates between relatively large populations in even years (1982, 1984. 1986) and relatively low populations in the odd years (1981, 1983, 1985). However, the largest population (recorded in 1986) was only times that of the smallest (1985). The content of their gastrovascular cavity (Fig. 3) is as predictable as is the temporal occurrence of their g 3 £ 2 .O E. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole, Mass. : Marine Biological Laboratory
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
