Environmentally Realistic Exposure to the Herbicide Atrazine Alters Some Sexually Selected Traits in Male Guppies

Male mating signals, including ornaments and courtship displays, and other sexually selected traits, like male-male aggression, are largely controlled by sex hormones. Environmental pollutants, notably endocrine disrupting compounds, can interfere with the proper functioning of hormones, thereby impacting the expression of hormonally regulated traits. Atrazine, one of the most widely used herbicides, can alter sex hormone levels in exposed animals. I tested the effects of environmentally relevant atrazine exposures on mating signals and behaviors in male guppies, a sexually dimorphic freshwater fish. Prolonged atrazine exposure reduced the expression of two honest signals: the area of orange spots (ornaments) and the number of courtship displays performed. Atrazine exposure also reduced aggression towards competing males in the context of mate competition. In the wild, exposure levels vary among individuals because of differential distribution of the pollutants across habitats; hence, differently impacted males often compete for the same mates. Disrupted mating signals can reduce reproductive success as females avoid mating with perceptibly suboptimal males. Less aggressive males are at a competitive disadvantage and lose access to females. This study highlights the effects of atrazine on ecologically relevant mating signals and behaviors in exposed wildlife. Altered reproductive traits have important implications for population dynamics, evolutionary patterns, and conservation of wildlife species

Kinship Care for the Safety, Permanency, and Well‐being of Children Removed from the Home for Maltreatment

Child abuse and neglect are common problems across the world that result in negative consequences for children, families and communities. Children who have been abused or neglected are often removed from the home and placed in residential care or with other families, including foster families. Foster care was traditionally provided by people that social workers recruited from the community specifically to provide care for children whose parents could not look after them. Typically they were not related to the children placed with them, and did not know them before the placement was arranged. In recent years many societies have introduced policies that favour placing children who cannot live at home with other members of their family or with friends of the family. This is known as 'kinship care' or 'families and friends care'. We do not know what type of out-of-home care (placement) is best for children. This review was designed to help find out if research studies could tell us which kind of placement is best. Sixty two studies met the methodological standards we considered acceptable. Wherever possible we combined the data from studies looking at the same outcome for children, in order to be more confident about what the research was telling us. Current best evidence suggests that children in kinship care may do better than children in traditional foster care in terms of their behavioral development, mental health functioning, and placement stability. Children in traditional foster care placements may do better with regard to achieving some permanency outcomes and accessing services they may need. Implications for practice and future research are discussed