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Determination of the maximum and minimum lethal temperatures (LT50) for Loxosceles intermedia Mello-Leitao, 1934 and L. laeta (Nicolet, 1849) (Araneae, Sicariidae)


Determination of the maximum and minimum lethal temperatures (LT50) for Loxosceles intermedia Mello-Leitao, 1934 and L. laeta (Nicolet, 1849) (Araneae, Sicariidae)



Journal of Thermal Biology 28(8): 563-570



ISSN/ISBN: 0306-4565

DOI: 10.1016/j.jtherbio.2003.07.002

In this study, the maximum and minimum lethal temperatures (LT50) of L. intermedia and L. laeta were determined in two treatments: gradual heating (25-50[degree]C) and cooling (25[degree]C to -5[degree]C), and 1 h at a constant temperature. In gradual temperatures change, L. intermedia mortality started at 40[degree]C and the LT50 was 42[degree]C; for L. laeta, mortality began at 35[degree]C and the LT50 was 40[degree]C. At low temperatures, mortality was registered only at -5[degree]C for both species. In the constant temperature L. intermedia showed a maximum LT50 at 35[degree]C and L. laeta at 32[degree]C; the minimum LT for both species was -7[degree]C.

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Accession: 003707152

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