. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. BIOLOGY OF ASCIDIA NIGRA 39 to an environmental factor, possibly a biotic factor concerned with competition from other sessile organisms. Similar sorts of communities developed with each population dominated by cirripedes, serpulids and colonial ascidians. The data on the associated fauna and flora are necessarily rather superficial but there is nothing in the record to suggest that one community differed much from the other. Atten- tion should be drawn to the fact that June is one of the months when breeding in A. nigra is
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. BIOLOGY OF ASCIDIA NIGRA 39 to an environmental factor, possibly a biotic factor concerned with competition from other sessile organisms. Similar sorts of communities developed with each population dominated by cirripedes, serpulids and colonial ascidians. The data on the associated fauna and flora are necessarily rather superficial but there is nothing in the record to suggest that one community differed much from the other. Atten- tion should be drawn to the fact that June is one of the months when breeding in A. nigra is normally at a minimum (Goodbody, 1961), suggesting that this is a poor time of year for breeding and subsequent survival. August, on the other hand, is at the beginning of the autumnal rise in breeding activity of this species, suggesting that environmental conditions for breeding and survival of the young are improving. 1000- 5OO- 00- 5O- O a: 10- 5-. O 10 20 DAYS 30 4O FIGURE 2. Survival in two populations of young ascidians, C (- settled in August, 1961, and reared four feet below the sea surface. -) and 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
Size: 1273px × 1964px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
