Feeding responses of cladocerans exposed to pesticides: comparison between Ceriodaphnia silvestrii and Ceriodaphnia dubia

Author(s)

Moruzzi, Bruna Cario Cornachioni ; da Silva, Lais Conceicao Menezes ; Gebara, Renan Castelhano ; Montagner, Cassiana C. ; Longo, Elson ; Gaeta Espindola, Evaldo Luiz ; Moreira, Raquel Aparecida

• Document type: Journal article
• Source: CHEMISTRY AND ECOLOGY; v. N/A, p. 15-pg., 2025-04-10.

Abstract

The frequent use of pesticides in different agricultural crops, such as fipronil and 2,4-dichlorophenoxyacetic acid (2,4-D), is reported to affect the non-target organisms in ecosystems, including aquatic biota. It is important to assess sensitive parameters of individuals, such as ingestion rates as they are related to secondary production and ecological interactions. Therefore, this study aimed to investigate the effects of Regent (R) 800 WG (active ingredient - a.i. fipronil) and DMA (R) 806 BR (a.i. 2,4-D) on the feeding responses (filtration and ingestion rates) and the recovery (post-exposure) of the cladocerans Ceriodaphnia silvestrii (Brazilian standardised species) and Ceriodaphnia dubia (International standardised species). Results show different responses of these two species: fipronil increased and decreased, respectively, the filtration and ingestion rates of C. silvestrii and C. dubia; while 2,4-D increased the filtration and ingestion rates of the two species. In post-exposure, we did not observe significant effects on C. silvestrii nor C. dubia exposed to both pesticides, indicating a recovery response. Our study emphasises species-specific responses of cladoceran species to the fipronil and 2,4-D pesticides, highlighting the importance of studying and comparing the toxicity of compounds to both species, even if monophyletic, as they may have different physiological responses and sensitivity. (AU)

• FAPESP's process: 24/15099-7 - Ecotoxicological effects of zinc tungstate (ZnWO4) and copper tungstate (CuWO4) on initial stages of zebrafish: lethal and sublethal effects, and swimming behavior
• Grantee: Renan Castelhano Gebara
• 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: 21/13583-0 - Ecotoxicological Effects of Nanoparticles of ZnWO4 and CuWO4 On a Freshwater Planktonic Foodchain: Evaluating Possible Environmental Impacts of Emerging Contaminants
• Grantee: Renan Castelhano Gebara
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 13/07296-2 - CDMF - Center for the Development of Functional Materials
• Grantee: Elson Longo da Silva
• Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC