Browsing by Subject "Sexual Maturation"

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Open Access
Introduction to sex differences in neurotoxic effects.
(Neurotoxicology and teratology, 2021-01) Levin, Edward D; Dow-Edwards, Diana; Patisaul, Heather
Open Access
Reproduction and population growth in free-ranging mantled howling monkeys.
(Am J Phys Anthropol, 1980-07) Glander, KE
Free-ranging mantled howling monkey (Alouatta palliata Gray) females experienced a regular estrus cycle averaging 16.3 days, demonstrated sexual skin changes, and participated in multiple matings before becoming pregnant. Gestation averaged 186 days. The average interval between births was 22.5 months. Sexual maturity occurred at approximately 36 and 42 months for females and males, respectively. Female age at first birth was about 3 1/2 years. Births were scattered during some years and clustered during others. The age, rank, and parity of the females affected infant survival. More female than male infants survived to one year of age. Increased population size was the result of immigration rather than births.
Open Access
Responses to conspecific chemical stimuli in the treatment snail Achatina fulica (Pulmonata: Sigmurethra).
(Behavioral biology, 1978-03) Chase, R; Pryer, K; Baker, R; Madison, D
The giant African snail, Achatina fulica, followed trails made with the mucus of A. fulica, but did not follow those consisting of mucus from Otala vermiculata. In olfactometer experiments, A. fulica and Helix aperta oriented preferentially toward the odor of their own species when both odors were presented simultaneously. Species specificity was less pronounced when the odor of O. vermiculata was paired with either of the other two snail odors. Sexually mature A. fulica that had been housed individually for 30 days prior to testing followed mucus trails better than did similar snails housed collectively. Immature A. fulica did not follow trails better after isolation, but showed a facilitative effect of isolation on conspecific orientation in the olfactometer. Three-week-old snails, maintained in individual containers from the time of hatching, also oriented preferentially toward conspecific odors. © 1978 Academic Press, Inc.