File:American malacological bulletin (1987) (17970218999).jpg

Title: American malacological bulletin
Identifier: americanmal4519861987amer (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

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3-- 2 -- 1 I I I I I I I I h—h g Fall Oanartllon 1 98$ Q Fall 0«n»f «tlon 19 8 1 fj Fill Q«ne>«llon 1980 flgnnti O*n«rttlon 1982 O Summtr Q«n«ratlon 1981 RP )—I—I—+ i—I—I—I—f
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FP I I I I .. I . I . I I . I .1 .. I J F M A M SON Fig. 3. Changes in mean shell lengths for various generations of Pisidium casertanum for the period June 1982 - May 1983 from two ponds in southwest Virginia (Riopel Pond - RP and Farriers Pond - FP). Boxes around means are standard deviations. The horizontal dash-dot lines indicate the minimum size needed to produce young (1.7 mm from RP and 2.3 mm from FP). Numbers below means are the percentages of the total population that the specific generation constitutes. Data for January - May 1983 were plotted before the June - December 1982 data to facilitate the observation of annual trends. This assumed little year to year variation in population dynamics.

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