. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. LIFE HISTORY OF A TUBE-DWELLING HERMIT CRAB 71 N co n = 30 —i • 1 1 1— • OS 1 12 ^SHIELD LENGTH (mm) B 1000-1 n = 30 —1— 1 5 25 35 SHIELD LENGTH (mm) Figure 3. Relationships between the size of ovigerous females (shield length) and both the number (after a In-ln transformation. A) and the diameter (maximum axis, B) of the spawned eggs. chelipeds were missing more often than left ones ( vs. , X2 = , df = 1, P<). Eggs Egg-bearing females occurred in winter samples only. They were first found in January a
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. LIFE HISTORY OF A TUBE-DWELLING HERMIT CRAB 71 N co n = 30 —i • 1 1 1— • OS 1 12 ^SHIELD LENGTH (mm) B 1000-1 n = 30 —1— 1 5 25 35 SHIELD LENGTH (mm) Figure 3. Relationships between the size of ovigerous females (shield length) and both the number (after a In-ln transformation. A) and the diameter (maximum axis, B) of the spawned eggs. chelipeds were missing more often than left ones ( vs. , X2 = , df = 1, P<). Eggs Egg-bearing females occurred in winter samples only. They were first found in January and were still present at the end of April, though their percentage was low (20%, 9 out of 45). Their numbers did not differ from those of nonovigerous females (January 18: 19 vs. 10, X2 = , df = 1, ns; February 1:15 vs. 21, X2 = , df = 1. ns), and specimens in the two reproductive states shared the same size distribution (G = , df = 5, ns) and fre- quency per size class ( mm SL 70%, G = , df = 1, ns). The smallest and largest females found bearing eggs measured, respectively, and SL. Egg number per clutch ranged from 14 to 496, averaging 287. Female size (SL) was positively correlated with the number of eggs (after a In-ln transformation: r = , df = 28, P < , b = , a = ) (Fig. 3A). The value of the correlation coefficient did not significantly differ from 3 (/ = df = 28, ns): that is, clutch size is proportional to the cube of the SL (roughly equaling the body mass). The mean egg diameter was 722 ^m (SE = 19, n = 30), ranging from 455 to 990 ^m. A positive correlation was also found between the SL of the female and the average diameter of her eggs (r = , df == 28, P < b = , a = ) (Fig. 3B), showing that bigger females produce larger (and more numerous) eggs. Eggs are attached to the second through the fourth pleopods, about 100 per pleopod, in bunches of 7 to 15. They are slightly ovate
Size: 2089px × 1197px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
