. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. REPRODUCTIVE CYCLES OF M. EDULIS 305 LU o-2 JJASOND'jFMAMJJASONDljFMAMJJASONDljFMAMJJAS 1976 1977 1978 1979 700 600 500 400 300 200 100 O) and variance (O - - O) for male and FIGURE 6. Mean reproductive condition (GVF; O female Mytilus edulis from Shinnecock. days, the slopes will be similar. Analysis of covariance revealed heterogeneous slopes when all four regression lines were compared (Fj3j9} = ; P < ; Fig. 7). A simultaneous test procedure (Sokal and Rohlf, 1969) demonst
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. REPRODUCTIVE CYCLES OF M. EDULIS 305 LU o-2 JJASOND'jFMAMJJASONDljFMAMJJASONDljFMAMJJAS 1976 1977 1978 1979 700 600 500 400 300 200 100 O) and variance (O - - O) for male and FIGURE 6. Mean reproductive condition (GVF; O female Mytilus edulis from Shinnecock. days, the slopes will be similar. Analysis of covariance revealed heterogeneous slopes when all four regression lines were compared (Fj3j9} = ; P < ; Fig. 7). A simultaneous test procedure (Sokal and Rohlf, 1969) demonstrated that within population regressions between years had similar slopes while the slopes between populations were clearly different. This analysis suggests that differences in gametogenic cycles between the Stony Brook and Shinnecock populations were not directly related to any difference in schedule of degree-days ( temperature). coast populations The mean reproductive condition of combined males and females from seven localities (including Stony Brook and Shinnecock) along the Atlantic Coast demonstrates large variation in the timing of maximum GVF (Fig. 1). This ranged from a peak in reproductive condition in May (Maine) to a peak in September (Shinnecock). The Rhode Island population had no obvious reproductive maxima during the six summer months. The differences between Stony Brook and Shin- necock, described earlier, were greater than between any other two sampled lo- calities. There was no clear latitudinal trend in the timing of maximum GVF. DISCUSSION There have been many attempts to determine the key environmental factor(s) that synchronize the reproductive cycle among individuals within marine inverte- brate populations to prevailing environmental conditions. Water temperature, which varies with season and latitude in a moderately uniform manner, frequently has been assigned a dominant synchronizing role. It has been found for certain species that the
Size: 1887px × 1324px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
