Group choruses of marine animals can produce extraordinarily loud sounds that markedly elevate levels of the ambient soundscape. We investigated sound production in the Gulf corvina (Cynoscion othonopterus), a soniferous marine fish with a unique reproductive behaviour threatened by overfishing, to compare with sounds produced by other marine animals. We coupled echosounder and hydrophone surve...

Mechanisms for identifying appropriate mating partners are critical for species propagation. In many species, the male uses multiple sensory modalities to search for females and to subsequently determine if they are fit and receptive. Males can also use the information they acquire in this process to change their courtship behavior and reduce courtship of classes of targets that are inappropria...

In the 1960s and 1990s, internal strife in Rwanda has caused a mass flow of refugees into neighbouring countries. This paper explores the cumulated fertility of Rwandan refugee women and the survival of their children. To this end, we use a national survey covering 6420 former refugee and non-refugee households conducted between 1999 and 2001. The findings support old-age security theories of r...

BACKGROUND Medicinal leeches (Hirudo spp.) are simultaneous hermaphrodites. Mating occurs after a stereotyped twisting and oral exploration that result in the alignment of the male and/or female gonopores of one leech with the complementary gonopores of a partner. The neural basis of this behavior is presently unknown and currently impossible to study directly because electrophysiological recor...

Although multiple lines of evidence suggest that early adult life is very important in shaping the reproductive behavior of males, few studies have looked at the fitness consequences of the variation in reproductive behavior induced by differences in early life experience of males. Using a long term laboratory adapted population of Drosophila melanogaster Meigen (Diptera: Drosophilidae), early ...

In order to capitalise on new opportunities to advance contraceptive and reproductive health choices globally, organisations working in these fields will need to overcome six institutional obstacles. These are: (i) committee management; (ii) over-medicalisation; (iii) fear of risk and controversy; (iv) conferences, meetings, and symposia; (v) obsession with coordination; and (vi) fear of sex. T...