Abstract
Beauveria bassiana spores and metabolites were evaluated for toxicity and pathogenicity to Mysidopsis bahia. Static acute 96-h tests were conducted with ⩽24-h-old M. bahia using either conidiospores; the mycotoxin, beauvericin, or a nonpolar extract of the mycelia. Conidiospore densities of ⩾1.5×106/ml caused high mortalities. These mortalities were attributed to a high particulate density since heat-killed controls also proved lethal. Beauvericin, a cyclic depsipeptide produced by some strains of B. bassiana, was toxic at an LC50 of 0.56 mg/L. The toxicity of beauvericin persisted in sterile seawater for at least 3, but not, 8 weeks. A nonpolar extract of mycelia from B. bassiana, which contained approximately 1% beauvericin by weight, was toxic at an LC50 of 84.2 mg/L. In contrast, a nonpolar extract of mycelia from the fungal weed pathogen, Colletotrichum gloeosporioides f. sp. aeschynomene, was not toxic when tested up to 70.4 mg/L.
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Contribution No. 840, Environmental Research Laboratory, U.S. EPA, Gulf Breeze, FL 32561.
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Genthner, F.J., Cripe, G.M. & Crosby, D.J. Effect of Beauveria bassiana and its toxins on Mysidopsis bahia (mysidacea). Arch. Environ. Contam. Toxicol. 26, 90–94 (1994). https://doi.org/10.1007/BF00212798
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DOI: https://doi.org/10.1007/BF00212798