Occurrence and ecological risk assessment of neonicotinoids and related insecticides in the Bohai Sea and its surrounding rivers, China

Systemic insecticides like neonicotinoids and the phenylpyrazole insecticide fipronil are the most widely applied insecticides around the world. Multiple studies analyzed insecticide residues in freshwater systems, but data on seawater contamination levels are scarce. This study investigates the spatiotemporal distribution and ecological risk assessment of fipronil, neonicotinoids, sulfoxaflor and selected transformation products (TPs) in the Chinese Bohai Sea and its surrounding rivers. Well-established neonicotinoids (acetamiprid, clothianidin, imidacloprid, thiacloprid and thiamethoxam) and TPs of fipronil and imidacloprid were frequently detected (detection frequency (DF): 42-100%) in freshwater. The median total insecticide concentration in freshwater was significantly higher in summer (72.4 ng center dot L-1) than in fall (23.4 ng center dot L-1), with major contributions from neonicotinoids, suggesting that pollution originates mostly from diffuse sources. In 2018, acetamiprid, desnitro-imidacloprid, fipronil-desulfinyl and thiacloprid were abundant in seawater (DF: 47-100%), indicating a high stability of acetamiprid and thiacloprid and a rapid photodegradation of fipronil and imidacloprid in surface waters. These results indicate that the continued use of these parent compounds may lead to their accumulation and/or of their TPs in shallow coastal seas. Consequently, this may lead to their transport to open seas, increasing their potential risk to marine organisms. Similarities between contaminant fingerprints in freshwater and seawater strongly suggest riverine discharges as main pollution source of adjacent coastal areas. This is the first study to perform an ecological risk assessment of fipronil, neonicotinoids, sulfoxaflor and selected TPs on marine ecosystems. Fipronil and its TPs demonstrated to be environmentally relevant with potential high risks for aquatic species. Our study provides novel insights into the fate and ecological risk of fipronil, neonicotinoids, sulfoxaflor and their TPs to marine species in shallow coastal seas

"Eu não preciso falar que eu sou branca, cara, eu sou Latina!" Ou a complexidade da identificação racial na ideologia de ativistas jovens (não)brancas "I do not have to say that I am white, man, I am Latina!" Or the complexity of racial identification in the ideology of (non)white, young, female activists

Neste artigo procuro explorar a complexidade do processo de formação da identidade racial de mulheres, jovens ativistas (não)brancas em São Paulo. Levando em conta a interação do indivíduo com o mundo social, distingue-se a identidade racial apropriada da atribuída e a identidade racial individual da coletiva. Isso requer atenção para o papel da posição social racial, com as subsequentes vantagens raciais, para os sentimentos da ativista neste processo e para a influência mútua da heterogeneidade de identidade racial, do deslocamento da identidade racial e, por conseguinte, do papel da formação de identidade como estratégia de ideologia e práxis ativista.<br>In this article, I explore the complexity of racial identity formation of (non)white, young, female activists in São Paulo. Taking into account the interaction of the individual with the social world, one must distinguish between appropriated and attributed racial identities, as well as individual and collective identities. This requires attention to the role of racial social position and its subsequent racial advantages, to the feelings of activists about this process, and to the mutual influence of the heterogeneity of racial identity, the displacement of racial identity and, consequently, the role of identity formation as a strategy of activist ideology and praxis