. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 32 ROBERT L. CIMBERG seasonal reproductive activity in several barnacle species (Hines, 1978) and in- creases during the spring as P. polymerus broods at Friday Harbor (Lewis, 1975a). Reproductive activity varies on a small spatial scale with changes in tidal level in barnacles (Crisp, 1950, 1959) and other invertebrates. This might occur in P. polymerus. On a larger spatial scale, variability in reproductive activity within a species whose populations are geographically separated and exposed to different environmental condi
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 32 ROBERT L. CIMBERG seasonal reproductive activity in several barnacle species (Hines, 1978) and in- creases during the spring as P. polymerus broods at Friday Harbor (Lewis, 1975a). Reproductive activity varies on a small spatial scale with changes in tidal level in barnacles (Crisp, 1950, 1959) and other invertebrates. This might occur in P. polymerus. On a larger spatial scale, variability in reproductive activity within a species whose populations are geographically separated and exposed to different environmental conditions has been attributed to genetic differences (Sastry, 1975). Such variability might occur between populations of P. polymerus from the warm and cold temperate zones. This study further investigated patterns of and factors regulating reproductive activity in the barnacle P. polymerus. Answers to the following questions were sought: (1) Does seasonal reproductive activity at sites in both the cold and warm temperature zones fit the model of an optimal temperature for brooding activity? (2) Does water temperature, more than food, control seasonal reproductive activity? (3) What is the relative importance of tidal exposure on reproductive activity? (4) Is there reproductive evidence for genetic differences between populations? MATERIALS AND METHODS Field studies Seasonal brooding activity was studied at a cold temperate site near the Pismo Beach pier (° N, ° W) and at warm temperate sites at Bird Rock, Santa Catalina Island, (° N, ° W) and at Latigo Point (° N, ° W) (Fig. 1) during 1972-1977. P. polymerus was sampled throughout the PISMO BEACH OLETA POINT \ \ \ CONCEPTION \ v * I3°C 20°C LATIGO POINT LOS ANGELES PACIFIC OCEAN SANTA CATALINA ISLAND^. FIGURE 1. Map of the region around Point Conception, California, showing study sites (solid squares) and nearshore current patterns during the oceanic and upwelling seasons (after Pirie et al
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
