Mortality, metabolic rate, and oviposition of Gryllus (Gryllus) assimilis (Fabricius, 1775) (Orthoptera: Gryllidae) females under constant and fluctuating warm temperatures.

Autor: Centeno Filho BL; Programa de Pós-Graduação em Fisiológicas, Instituto de Ciências Biológicas, Universidade Federal de Rio Grande, Av. Itália, km 8, Campus Carreiros, Rio Grande, RS, 96203-900, Brazil., Limberger GM; Programa de Pós-Graduação em Fisiológicas, Instituto de Ciências Biológicas, Universidade Federal de Rio Grande, Av. Itália, km 8, Campus Carreiros, Rio Grande, RS, 96203-900, Brazil., Esteves KP; Instituto de Ciências Biológicas, Universidade Federal de Rio Grande, Av. Itália, km 8, Campus Carreiros, Rio Grande, RS, 96203-900, Brazil., Fonseca DBD; Instituto de Ciências Biológicas, Universidade Federal de Rio Grande, Av. Itália, km 8, Campus Carreiros, Rio Grande, RS, 96203-900, Brazil., Maciel FE; Programa de Pós-Graduação em Fisiológicas, Instituto de Ciências Biológicas, Universidade Federal de Rio Grande, Av. Itália, km 8, Campus Carreiros, Rio Grande, RS, 96203-900, Brazil. Electronic address: maciel-fe@hotmail.com.
Jazyk: angličtina
Zdroj: Journal of thermal biology [J Therm Biol] 2023 May; Vol. 114, pp. 103574. Date of Electronic Publication: 2023 May 04.
DOI: 10.1016/j.jtherbio.2023.103574
Abstrakt: The global average temperature will increase by up to 5.7 °C, under high greenhouse gas emissions, consequently increasing the frequency of heatwaves, according to recent IPCC forecasts. These especially impacts ectotherms, such as insects, which are the most susceptible animals to changes in environmental temperature, affecting their physiology and reproduction. Thus, we investigated the effects of a 96-h exposure to constant temperatures (CT: 27, 30.5, 34, 39, 41, or 43 °C) and fluctuating temperatures (FT: 27/34 °C, 12/12 h) on the survival, metabolic rate, and oviposition of the female cricket Gryllus (Gryllus) assimilis (Orthoptera: Gryllidae). Mortality, body mass and water content of females and males were quantified and compared. It was found that CT 27 , CT 34 and FT 27/34 do not cause mortality in females of G. (G.) assimilis. CT 30.5 (average temperature between 27 and 34), despite causing mortality of 5.0 ± 3.5%, do not differ from CT 27 , CT 34 or FT 27/34 . CT 39 causes a mortality of 8.3 ± 5.5%. Estimated lethal temperature for 50% of the population of females (LT 50Temp ) is 40 °C, and 43 °C promotes 100% mortality in 96 h. Comparing mortality between sexes, females present higher LT 50Temp and thermotolerance than males. In addition, FT 27/34 and CT 34 do not differ in the metabolic rate, but both have higher values than CT 27 . CT 34 strongly reduces oviposition in females, however FT 27/34 does not. We suggest that CT 34 reduces oviposition in females in two ways: by affecting the endocrine system related to egg production, or by causing behavioral egg retention, as a strategy to survive thermal stress. Moreover, females had a higher wet body mass and present a lower average weight loss than males. In conclusion, despite females present a higher mortality at temperatures above 39 °C, they are more thermotolerant than males. Furthermore, CT 34 is detrimental to the oviposition of G. (G.) assimilis.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have influenced the work reported in this study.
(Copyright © 2023 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
Externí odkaz: