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Daphnia magna Exudates Impact Physiological and Metabolic Changes in Microcystis aeruginosa ArchiMer
Bojadzija Savic, Gorenka; Edwards, Christine; Briand, Enora; Lawton, Linda; Wiegand, Claudia; Bormans, Myriam.
While the intracellular function of many toxic and bioactive cyanobacterial metabolites is not yet known, microcystins have been suggested to have a protective role in the cyanobacterial metabolism, giving advantage to toxic over nontoxic strains under stress conditions. The zooplankton grazer Daphnia reduce cyanobacterial dominance until a certain density, which may be supported by Daphnia exudates, affecting the cyanobacterial physiological state and metabolites’ production. Therefore, we hypothesized that D. magna spent medium will impact the production of cyanobacterial bioactive metabolites and affect cyanobacterial photosynthetic activity in the nontoxic, but not the toxic strain. Microcystin (MC-LR and des-MC-LR) producing M. aeruginosa PCC7806 and...
Tipo: Text Palavras-chave: Cyanobacteria; Secondary metabolites; PCC7806; Toxic; Mutant; Infochemicals.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00507/61893/65980.pdf
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Impact of odor signáis on Cycloneda sanguínea (Coleóptera: Coccinellidae) searching behavior Ciencia e Investigación Agraria
Heit,Guillermo E; Cohén,Graciela; Mareggiani,Graciela.
Volatile infochemicals generated by aphids, their host plants, or from the interaction between host plant and herbivore (herbivore-induced volatile plant compounds) are among the environmental stimuli used by predators to lócate prey The objective of this study was to evalúate the olfactometric response of the predator Cycloneda sanguínea (Coleóptera: Coccinellidae) to volatile infochemicals associated with the tomato plant, Lycopersicon esculentum Mili. (Solanaceae), and the aphid prey Myzus persicae Sulzer (Hemiptera: Aphididae). Predator behavior was evaluated in an airflow olfactometer at 24 ± 2°C with 65 ± 10% relative humidity and a 16 h photoperiod. Latency time and the number of visits to the active chamber where the odor source was located were...
Tipo: Journal article Palavras-chave: Cycloneda sanguínea; Infochemicals; Lycopersicon esculentum; Myzus persicae; Olfactometer.
Ano: 2008 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202008000200010
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