. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. SELECTIVE COUPLING OF GAMMARIDS. 101 ± ; f°r D. fasciatus, r- = ± Figs. 3 and 4 give the fitted lines of regression for mean lengths of the females associated with males of the corresponding length classes. The formation of breeding pairs, according to Holmes (1903) and others who have studied the question of " sex-recognition " in gammarids and among other crustaceans,1 is brought about in a purely mechanical way. The initial encounter of male and female is by accident. Males tend to clasp object
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. SELECTIVE COUPLING OF GAMMARIDS. 101 ± ; f°r D. fasciatus, r- = ± Figs. 3 and 4 give the fitted lines of regression for mean lengths of the females associated with males of the corresponding length classes. The formation of breeding pairs, according to Holmes (1903) and others who have studied the question of " sex-recognition " in gammarids and among other crustaceans,1 is brought about in a purely mechanical way. The initial encounter of male and female is by accident. Males tend to clasp objects with which they come into contact. A male seized by another male struggles until freed. A female, on the contrary, is passive when clasped, with abdomen and thoracic legs flexed, the whole body compact. This account 13 12 11 10 9 8 7. 1Q5 FIG. 4. Regression of mean length of females upon length of males, pairs of D. fasciatus, lengths in nuns., class centers of males, abscissas; ordinates, mean lengths of associated females. we can confirm for the species dealt with in our measurements. There is clearly a good mechanical reason for the formation of couples in which large males carry large females, and small males carry small females. Holmes (1903) observed that a small male 1 Holmes (1903, 1909); Pearse (1909); Andrews (1910); Chidester (1911).. 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
