File:American malacological bulletin (1988) (18156462195).jpg

Title: American malacological bulletin
Identifier: americanmal6719881990amer (find matches)
Year: 1983 (1980s)
Authors: American Malacological Union
Subjects: Mollusks; Mollusks
Publisher: (Hattiesburg, Miss. ?) : (American Malacological Union)
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Biodiversity Heritage Library

View Book Page: Book Viewer
About This Book: Catalog Entry
View All Images: All Images From Book
Click here to view book online to see this illustration in context in a browseable online version of this book.

Text Appearing Before Image:
204 AMER. MALAC. BULL. 6(2) (1988)
Text Appearing After Image:
Fig. 10. Irregular blocks with smooth surfaces (HFW = 79 ^m). Fig. 11. Irregular blocks with component secondary lamellae (HFW = 158 /im). Fig. 12. The groove is a convenient boundary between crossed-lamella (above) and complex crossed-lamella (below) (HFW = 790 ^m). Fig. 13. Adductor myostracum consists of tall prisms. Remnant of adductor muscle at top of photo (HFW = 31 ^im). Fig. 14. Organic compart- ments of pallial myostracum are sandwiched between naturally eroded shell layers (HFW = 16 /*m). Fig. 15. Adductor myostracum is sand- wiched between outer shell layer, crossed-lamella (above), and inner shell layer, complex crossed-lamella (below) (HFW = 32 ^m). seasonal pattern. In exposed clams, available data on microstructure of the inner shell surface for September and December 1985 indicated that increase in the frequency of occurrence of microstructure C and decrease in crossed-lamella one were similar to those in wild clams. However, complex-crossed lamella one that was consistently present in submerged clams, present only in June and September in wild clams, were absent in exposed clams. CONDITION INDEX AND ORGANIC CONTENT OF SHELL Average percentages (± one standard deviation, n) of condition indices in wild (June 1985 = 3.30 ± 0.97, n = 44, Sept 1985 = 2.64 ± 0.95, n = 45, Dec 1985 = 2.87 ± 0.96, n = 49, Mar 1986 = 4.00 ± 1.17, n = 50, June 1986 = 4.38 ± 0.99, n = 50), and submerged bivalves (Sept 1985 = 3.64 ± 1.53, n = 37, Dec 1985 = 4.60 ± 1.11, n = 11, Mar 1986 = 6.22 ± 1.06, n = 4) varied significantly as tested by ANOVA (Tables 4). In exposed clams, samples were available only for September 1985 (5.14 ± 0.80, n = 6). The Tukey test indicates that the condition index in wild clams can be divided into three groups; June-1985, September 1985, and March 1986-June 1986. Tukey test could not determine how the December con- dition index was related to either June or September 1985 groups (at least one type II error has been committed) (Table 4). Condition indices in submerged clams can be divided in- to September 1985 and March 1986 groups. A Tukey test could not determine how the December condition index was related

Note About Images