Sex allocation theory has proved to be one the most successful theories in evolutionary ecology. However, its role in more applied aspects of ecology has been limited. Here we show how sex allocation theory helps uncover an otherwise hidden cost of neonicotinoid exposure in the parasitoid wasp Nasonia vitripennis. Female N. vitripennis allocate the sex of their offspring in line with Local Mate...

The contribution of adolescents' childbearing to total fertility rates in many sub-Saharan African countries is higher than in other parts of the world. In this paper, data collected from 897 female adolescents aged 15-19 years are analysed to investigate patterns and determinants of entry into motherhood in two informal settlements in Nairobi, Kenya, using Kaplan-Meier estimates and Cox regres...

Key features of reproductive behavior in China vary systematically through space and time. In this article we present an analysis of fertility change in regional space, using a 1% household sample from China’s 1990 population census. Elsewhere, we use the same data to analyze reproductive strategizing, but here we pursue the big picture with a straightforward analysis that takes reported births...

Individuals wishing to make informed choices about their health care need, among other things, information about the risks associated with each available option. Risk is the probability that an event will occur. A variety of study designs are used in reproductive health care to assess the risks associated with interventions. This paper describes the different methods, and explains why we need e...

This document contains seven different abstracts of scientific research examining issues related to and/or describing the reproductive behavior of the male rat and how this these behaviors can reveal important clues into the physiology of the body (of both human and non-human animals). This topic is very broad. Therefore, your abstracts will reflect some of that diversity in how people study th...

The U.S. Fish and Wildlife Service (USFWS) regulates the earliest opening and latest closing dates that States may use to establish duck-hunting seasons. These “framework dates” traditionally have centered around October 1 and January 20. The possibility of extending these dates so that seasons could open earlier and remain open later has been the subject of extensive and contentious debate wit...

In 2000, Tsutsui and colleagues discovered a neuropeptide gonadotropin-inhibitory hormone (GnIH) that inhibits gonadotropin release in birds. Subsequently, extensive studies during the last 15 years have demonstrated that GnIH is a key neurohormone that regulates reproduction in vertebrates, acting in the brain and on the pituitary to modulate reproduction and reproductive behavior. On the othe...

PURPOSE We wanted to explore the context of help seeking for reproductive and nonreproductive health concerns by urban adolescent girls. METHODS We undertook a qualitative study using in-depth interviews of African American and Latina girls (n = 22) aged 13 to 19 years attending public high schools in the Bronx, NY. RESULTS Before the onset of sexual activity, most girls meet health needs w...

Group-based lending programs for the poor have drawn much attention recently. As many of these programs target women, an important research question is whether program participation significantly changes reproductive behavior and whether the gender of the participant matters. Using survey data from 87 Bangladeshi villages, we estimate the impact of female and male participation in group-based c...