| Title: | Grazer-Induced Chemical Defense in a Microcystin-Producing Microcystis aeruginosa (Cyanobacteria) Exposed to Daphnia gessneri Infochemicals |
| Author(s): | Vilar MCP; da Costa Pena Rodrigues TF; da Silva Ferrao-Filho A; de Oliveira EA; |
| Address: | "Laboratory of Ecophysiology and Toxicology of Cyanobacteria, Carlos Chagas Filho Institute of Biophysics, Federal University of Rio de Janeiro, Rio de Janeiro, 21949-902, Brazil. maurovilar@gmail.com. Laboratory of Ecophysiology and Toxicology of Cyanobacteria, Carlos Chagas Filho Institute of Biophysics, Federal University of Rio de Janeiro, Rio de Janeiro, 21949-902, Brazil. Laboratory of Evaluation and Promotion of Environmental Health, Instituto Oswaldo Cruz, FIOCRUZ, Rio de Janeiro, RJ, 21040-360, Brazil" |
| DOI: | 10.1007/s10886-021-01315-5 |
| ISSN/ISBN: | 1573-1561 (Electronic) 0098-0331 (Linking) |
| Abstract: | "Cyanobacteria are photosynthetic microorganisms that compose phytoplankton and therefore have a trophic relationship with zooplankton, which represent an important link for energy flux in aquatic food webs. Several species can form blooms and produce bioactive metabolites known as cyanotoxins. However, the ecological and adaptative role of these toxins are still under debate. Many studies have addressed the cyanotoxins' function in defense against herbivory when grazing pressure by zooplankton plays a role in phytoplankton top-down control. Thus, the present study evaluated the ecophysiological responses of the cyanobacterial strain Microcystis aeruginosa NPLJ-4 underlying the chemical induced defense against the cladoceran Daphnia gessneri. Exposure to predator infochemicals consisted of cultures established in ASM-1 medium prepared in a filtrate from a culture of adults of D. gessneri at an environmentally relevant density. Daphnia infochemicals promoted a significant increase in toxin production by M. aeruginosa. However, no differences in growth were observed, despite a significant increase in both maximum photosynthetic efficiency and electron transport rate in response to zooplankton. Additionally, there was no significant variation in the production of exopolysaccharides. Overall, although a grazer-induced defense response was demonstrated, there were no effects on M. aeruginosa fitness, which maintained its growth in the presence of Daphnia alarm cues" |
| Keywords: | Animals Daphnia/chemistry/*physiology Feeding Behavior *Food Chain Microcystins/*metabolism Microcystis/chemistry/*physiology Pheromones/*metabolism Cyanobacteria Kairomone Microcystins Predator-prey Zooplankton; |
| Notes: | "MedlineVilar, Mauro Cesar Palmeira da Costa Pena Rodrigues, Thiago Ferreira da Silva Ferrao-Filho, Aloysio de Oliveira E Azevedo, Sandra Maria Feliciano eng 306174/2018-9/conselho nacional de desenvolvimento cientifico e tecnologico/ E-26/203.032/2015/fundacao carlos chagas filho de amparo a pesquisa do estado do rio de janeiro/ 2021/09/28 J Chem Ecol. 2021 Nov; 47(10-11):847-858. doi: 10.1007/s10886-021-01315-5. Epub 2021 Sep 27" |
