. Bulletin. Science. GRANDIDIERELLA JAPONICA IN UPPER NEWPORT BAY, CALIF. 39 16 15 4 14 Day length Temperature O O Salinity. 1111 n 11 I;i II11 i 11ll11 u 111 ;fl i II11 i 111' i i 111! i; T 35 - 900 -- 30 - 850 'c/T - 25 - 800 0) C -- 20 ~o> - - 750 E v—* ^—«" >% x: -*-> -- 15 "c -J - 700 D) C 76 J2 -- 10 CO - 650 -- 5 - 600 - 0 - 550 J A N D J Date M A M J Fig. 6. Weekly bottom water temperature and salinity in Upper Newport Bay, and day length, from July 1993 to June 1994. animals released in all other months except July (P < ). A significant cor- relation was foun
. Bulletin. Science. GRANDIDIERELLA JAPONICA IN UPPER NEWPORT BAY, CALIF. 39 16 15 4 14 Day length Temperature O O Salinity. 1111 n 11 I;i II11 i 11ll11 u 111 ;fl i II11 i 111' i i 111! i; T 35 - 900 -- 30 - 850 'c/T - 25 - 800 0) C -- 20 ~o> - - 750 E v—* ^—«" >% x: -*-> -- 15 "c -J - 700 D) C 76 J2 -- 10 CO - 650 -- 5 - 600 - 0 - 550 J A N D J Date M A M J Fig. 6. Weekly bottom water temperature and salinity in Upper Newport Bay, and day length, from July 1993 to June 1994. animals released in all other months except July (P < ). A significant cor- relation was found between the length of the female and the average length of the offspring produced (P < ). However, when offspring length was adjusted for female size (data not shown), the pattern for juvenile size by month remained the same. There was no significant relationship between the brood size and the length of the juveniles. The bottom water temperature in Upper Newport Bay was highest from June through September and then declined to a low in December (Fig. 6). Day length showed a pattern similar to temperature. Salinity remained fairly constant at about 30 g/kg except for a few declines following periods of rain. A significant corre- lation was found between temperature and day length (r = , P < ). However, mean brood size correlated with day length (r = , P < ), but not with temperature or salinity. The total number of animals found in the cores correlated both with day length (r = , P < ) and temperature (r = , P < ), but not with salinity. Discussion The presence of juveniles and gravid females each month during the present study indicates that Grandidierella japonica reproduce throughout the year, at this site in Upper Newport Bay. Year-round breeding has been noted in other Gam- maridea, especially among those in warm climates (Wildish 1982). If the gener- ation times that we found in the laboratory hold true for the
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