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SUMMARY Previous studies have reported high rates of depression and suicide for farmers compared to other occupations. From a representative sample of 390 Iowa farmers in the Iowa Farm Family Health and Hazard Survey, we found that 12.1− of Iowa principal farm operators had depressive symptoms based on a cut-off point of 16 on a standardized questionnaire for depressive symptoms (the CES-D Scale). A weighted multiple logistic regression model yielded the following risk factors for depressive symptoms: had legal problems (adjusted odds ratio = 7.35, 95− confidence interval = 3.09-17.48); not married (3.89, 1.10-13.73); sentimental value loss (2.96, 1.03-8.54);substantial income decline (2.91, 1.67-5.06); and decline in general health assessment compared with the excellent health group [very good and good group (3.39, 0.82-14.06) and fair and poor group (5.41, 1.89-15.43)].

In lizards, pheromonal cues are important for mate recognition and are expected to diverge during the speciation process. We tested for divergence in pheromonal mate and species recognition between male flat lizards (Platysaurus broadleyi) belonging to the same population, a different population, and a sister species. Males were given a choice between two refuges, an odourless control and one of the following: a conspecific female from the same population (sympatric), a conspecific female from a distant population (allopatric), and a female from their sister species (heterospecific), P. capensis. Males chose refuges treated with the scent of aheterospecific over an odourless control refuge but showed no preference for refuges that were scented with female conspecific (allopatric or sympatric) cues over the control. These results were consistent in the breeding and non-breeding seasons. In a second experiment males were offered a choice of female scents between sympatric and allopatric conspecifics; an allopatric conspecific and a heterospecific; and a sympatric conspecific and a heterospecific. Males showed a trend of preferring heterospecific over conspecific refuges and allopatric over sympatric conspecific-scented refuges, but these results were not significant at alpha