. The Biological bulletin. Biology; Zoology; Marine biology. P. E. FELL AND W. F. JACOB cc 40 < _J Q l±J 30 H h- (f) 20 C£ LU 10 3 -z. -z. Z -o ujH z cc < < -1 _i o_ LU LU CC LU C0 A y///////////\ \mmtm\ f/MW\ fW7777R D ON UPPER SURFACE E3 ON UNDER SURFACE I ON TYGON TUBING WATER TEMPERATURE,-'. B 1 ll ll I 1 ii ii iii i 11 A A A A A APRIL MAY JUNE JULY AUG. SEPT. 25 u_ ?o H Z |R LU U 10 Cfl III b 111 DC O Figure 12. Summary of sexual reproduction by postdormant and postlarval specimens of Halichondria sp. in the Mystic Estuary, Connecticut. Surface water temperature and larval settle
. The Biological bulletin. Biology; Zoology; Marine biology. P. E. FELL AND W. F. JACOB cc 40 < _J Q l±J 30 H h- (f) 20 C£ LU 10 3 -z. -z. Z -o ujH z cc < < -1 _i o_ LU LU CC LU C0 A y///////////\ \mmtm\ f/MW\ fW7777R D ON UPPER SURFACE E3 ON UNDER SURFACE I ON TYGON TUBING WATER TEMPERATURE,-'. B 1 ll ll I 1 ii ii iii i 11 A A A A A APRIL MAY JUNE JULY AUG. SEPT. 25 u_ ?o H Z |R LU U 10 Cfl III b 111 DC O Figure 12. Summary of sexual reproduction by postdormant and postlarval specimens of Halichondria sp. in the Mystic Estuary, Connecticut. Surface water temperature and larval settlement are shown in A: right, monthly means in water temperature from data collected over a period of several years; left, the number of larvae settled on 10 Mercenaria shells per 3-week period. The shells were strung with the concave surface down and tygon tubing spacers between them. The pattern of settlement on available surfaces is indicated. The double arrow marks the earliest time that large numbers of small postlarvae were observed on eelgrass in the same area. The occurrence of larvae in plankton samples and the release of larvae by freshly collected specimens in the laboratory are shown in B : vertical lines show when plankton tows were made and dots indicate when larvae were found. Arrows with V-shaped heads denote release of larvae by postdormant specimens and arrows with solid heads indicate release of larvae by postlarval specimens. The occurrence of flagellated larva in postdormant specimens collected over several years and of embryos (actually large oocytes, embryos and/or larvae) in postlarval specimens during 1977 are shown in C : vertical lines indicate when postdormant specimens were collected; when dotted, flagellated larvae were observed in histological sections of the sponges. Open triangles show when embryos were found in postlarval specimens. Nearly twice as many larvae settled on the under (inner) surface as on the upper surface (54 compared to 29) of t
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectb, booksubjectzoology
