. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. 30 CALIFORNIA FISH AND GAME July 25 September 26 Dissolved Oxygen (mg-l ) e o o-. Temperature *C -t- 100 0 Density (#-l_1) 0325 0725 hrs. = 4- 1210 1545 1945 2320 0325 0725 hrs. HfTTT 0 20 40 I I I % ot Total Population Darkness FIGURE 6. Vertical distribution of Daphnia pulicaria (a) and Ceriodaphnia quadrangula (â ) in relation to dissolved oxygen concentration (â¢) and temperature (o) at Station I, 25 July and 26 September 1978, a
. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. 30 CALIFORNIA FISH AND GAME July 25 September 26 Dissolved Oxygen (mg-l ) e o o-. Temperature *C -t- 100 0 Density (#-l_1) 0325 0725 hrs. = 4- 1210 1545 1945 2320 0325 0725 hrs. HfTTT 0 20 40 I I I % ot Total Population Darkness FIGURE 6. Vertical distribution of Daphnia pulicaria (a) and Ceriodaphnia quadrangula (â ) in relation to dissolved oxygen concentration (â¢) and temperature (o) at Station I, 25 July and 26 September 1978, and diel vertical distribution at Station VIII, 17 May 1978, Big Bear Lake, California (curves fitted by eye). Reproduction and development of C. quandrangula occurred at temperatures as low as °C. This contrasts with results of studies in other lakes (Kwik and Carter 1975, Allan 1977) which showed biological zero, or the temperature at which the developmental rate is negligible for Ceriodaphnia quadrangula, was between °C and °C. Brood size was greatest during winter, declined to a low level in early spring, reached secondary peaks in May and August, and declined to an annual minimum in September. Brood size maxima coincided with phytoplankton standing crop maxima (Siegfried et al. 1982). Mean size of reproductive females peaked in March and generally declined through the sum- mer. Although mean size of reproductive females was similar at each station, C. quadrangula mean brood size was significantly higher at Station VIII than at Station I. We attributed this to greater food availably at Station VIII. Ceriodaphnia quadrangula occurred at lower dissolved oxygen concentra- tions than D. pulicaria (Figure 6). C quadrangula populations were evenly distributed throughout the epilimnion and declined with depth and declining dissolved oxygen concentrations. C. quadrangula did not exhibit a pronounced noctural ascent during the nonstratified period as did D. pu
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