The impact of child maltreatment on mental health and substance use trajectories among adolescents.

AIM: There is robust evidence that child maltreatment is a significant risk factor and linked to negative psychological outcomes. However, few studies have examined the impact of child maltreatment on mental health and substance use trajectories across adolescence. METHODS: Data were drawn from a larger longitudinal project, in which participants were recruited starting in grade 7-8 and followed on two more occasions biennially. The final baseline sample was comprised of 765 youth (Mage  = 12.73, SD = 0.67, 49.7% female, 57.6% Caucasian/White). Multivariate multinomial logistic regressions were conducted to examine whether youth with maltreatment histories differed in their internalizing, externalizing, and substance use problems trajectories (based on previous studies) than youth without maltreatment histories. Moderation analyses using multinomial logistic regression were also conducted to examine perceived family support and school connectedness as protective factors against the impact of maltreatment. RESULTS: Youth who experienced maltreatment were more likely to display more severe internalizing, externalizing, and substance use problem trajectories than youth without such histories. While not significant as moderators, perceived family support and school connectedness were significantly associated with each of the trajectories, with lower levels of perceived family support and school connectedness linked to more severe problem trajectories. CONCLUSIONS: Results highlight the ongoing and significant harmful impact of maltreatment among youth. Results also support further prevention and intervention efforts for child maltreatment, particularly at the family and school level.

[Visual and olfactory factors interaction in resource-location by the blowfly, Chrysomya megacephala (Fabricius) (Diptera: Calliphoridae), in natural conditions]. / Interação entre fatores visuais e olfativo em localização de recursos pela mosca-varejeira, Chrysomya megacephala (Fabricius) (Diptera: Calliphoridae), em condições naturais.

The interaction between olfactory and visual cues in the landing responses of Chrysomya megacephala (Fabricius) was analyzed in a natural environment (grass) using three plain cardboard circles with the colors white, black and other being the own grass (control) with 30 cm in diameter. The circles were divided in four quadrants and five sectors using as bait 80 mg of carcass of fish and minced flesh put in the center. To check the interaction between visual and olfactory factors, we analyzed the relation among the direction of wind and the sectors, the quadrants and the color of circle where C. megacephala adults landed. In the presence of the black and white circles, flies landed closer to the central release point of the bait when the wind was present compared with the other control circle. The results show that while odor cues may enhance the induction of landing by C. megacephala, visual cues are important when selecting a final landing site. Improved understanding of this interaction may allow the development of more effective traps or targets, enhancing the control efficiency of these control devices.

Interação entre fatores visuais e olfativo em localização de recursos pela mosca-varejeira, Chrysomya megacephala (Fabricius) (Diptera: Calliphoridae), em condições naturais / Visual and olfactory factors interaction in resource-location by the blowfly, Chrysomya megacephala (Fabricius) (Diptera: Calliphoridae), in natural conditions

A interação entre pistas visuais e olfativa na resposta de pouso de Chrysomya megacephala (Fabricius) foi analisada em ambiente natural. Para isso, foram utilizados três círculos planos de cartolina de cor branca, preta e outro com a própria grama (controle) com 30 cm de diâmetro. Os círculos foram divididos em quatro quadrantes e cinco setores circulares, tendo como isca 80 mg de carcaça de peixe e carne moída colocada no centro. Para verificar a interação entre as pistas visuais e a olfativa, foi analisada a relação entre a direção do vento e os setores, os quadrantes e a cor do círculo em que os adultos de C. megacephala pousavam. Na presença dos círculos preto e branco, as moscas pousaram mais próximo do ponto de liberação do odor das iscas quando o vento estava presente, em comparação com o círculo controle. Os resultados mostraram que a existência de odor pode melhorar a indução do pouso de C. megacephala e que pistas visuais são importantes para selecionar o local de pouso final. O entendimento dessa interação pode permitir o desenvolvimento de iscas e alvos mais efetivos, fortalecendo a eficiência de estratégias de controle.

The interaction between olfactory and visual cues in the landing responses of Chrysomya megacephala (Fabricius) was analyzed in a natural environment (grass) using three plain cardboard circles with the colors white, black and other being the own grass (control) with 30 cm in diameter. The circles were divided in four quadrants and five sectors using as bait 80 mg of carcass of fish and minced flesh put in the center. To check the interaction between visual and olfactory factors, we analyzed the relation among the direction of wind and the sectors, the quadrants and the color of circle where C. megacephala adults landed. In the presence of the black and white circles, flies landed closer to the central release point of the bait when the wind was present compared with the other control circle. The results show that while odor cues may enhance the induction of landing by C. megacephala, visual cues are important when selecting a final landing site. Improved understanding of this interaction may allow the development of more effective traps or targets, enhancing the control efficiency of these control devices.