Avoidance responses by Danio rerio reveal interactive effects of warming, pesticides and their mixtures

Author(s)

Moreira, Raquel A. ; Cordero-De-Castro, Andrea ; Polo-Castellano, Curro ; Pinto, Thandy J. S. ; Dias, Mariana A. ; Montagner, Cassiana C. ; Espindola, Evaldo L. G. ; Araujo, Cristiano V. M. ; Blasco, Julian

• Document type: Journal article
• Source: Science of The Total Environment; v. 847, p. 9-pg., 2022-07-28.

Abstract

Temperature variations and thermal extremes events caused by climate change can have profound implications for the toxicity of pesticides in aquatic organisms. Using an innovative system (Heterogeneous Multi-Habitat Test System HeMHAS) that allows the simulation of different scenarios within a spatially heterogeneous landscape, the effects on the habitat selection of Danio rerio fish caused by the pesticides fipronil and 2,4-D were studied as single compounds and in mixture and integrated with air temperature variation (20, 24 and 28 degrees C). As a result, D. rerio detected and avoided both pesticides at air temperatures of 20 and 24 degrees C; however, at 28 degrees C no significant difference was observed in habitat choice by fish. Additionally, when pesticides were mixed in a heterogeneously contaminated landscape, it was observed that D. rerio detected contamination and preferred the clean zone at 20 and 24 degrees C; however, at 28 degrees C the potential to escape from the most contaminated areas was impaired. Thus, contamination by both pesticides made the habitat selection behavior of fish at 20 and 24 degrees Cmore noticeable. In addition, the association between pesticides and temperature showed negative effects on the response of fish to detect and escape from contaminated environments, suggesting the influence of temperature in altering the ability of the organism to provide an efficient response to stress. (AU)

• FAPESP's process: 20/16131-0 - The effects of pesticides (2,4-D and Diuron), single and in mixture, on Daphnia magna and Danio rerio: a multiple endpoint approach at the local and landscape scales
• Grantee: Raquel Aparecida Moreira
• Support Opportunities: Scholarships abroad - Research Internship - Post-doctor
• FAPESP's process: 17/24126-4 - EFFECTS OF THE PESTICIDES FIPRONIL AND 2,4-D, ISOLATELY AND IN MIXTURE, ON NATIVE SPECIES OF THE NEOTROPICAL AQUATIC BIOTA
• Grantee: Raquel Aparecida Moreira
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 15/18790-3 - Environmental effects of the pasture-sugarcane conversion and pasture intensification
• Grantee: Luiz Antonio Martinelli
• Support Opportunities: Research Program on Global Climate Change - Thematic Grants