Gyrodactylus bullatarudis Turnbull, 1956, and Gyrodactylus turnbulli Harris, 1986, are recorded from guppies (Poecilia reticulata) from the northern mountains of Trinidad. Mixed infections of the 2 species were found at 9 localities. Gyrodactylus turnbulli had a predominantly posterior distribution on the fishes, whereas G. bullatarudis was more anteriorly distributed. This is the first record of these species from guppies collected from within their original range.
Publication of a studbook for Macaca silenus in 1983 provides detailed demographic information on the captive North American population. These data indicate that females reach sexual maturity at about 3 years of age, whereas onset of reproduction for males occurs at age 5. One-third of all sexually mature females and 57% of sexually mature males have not produced offspring. Maximum fertility of males and females is reached at 6 and 7 years, respectively, but in later life males show less effect of age on reproduction than females. The interval between births for lactating females averages just over 17 months. Lion-tails show no evidence of birth seasonality. Physiological studies in the San Diego Zoo colony revealed that the menstrual cycle is 31 days in length, and is characterized by a peak in estrogen excretion at midcycle, just prior to ovulation. Behavioral studies indicate that males require multiple mounts to achieve ejaculation. Copulation is nearly exclusively a phenomenon of the follicular phase of the cycle.
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