Programa de Pós-Graduação Em Ecologia Aquática e Pesca (PPGEAP), Núcleo de Ecologia Aquática e Pesca da Amazônia (NEAP), Universidade Federal do Pará (UFPA), Rua Augusto Correia, Nº1, Bairro Guamá, Belém, 66075-110, Pará, Brazil; Laboratório de Ecologia e Conservação (LABECO), Instituto de Ciências Biológicas (ICB), Universidade Federal do Pará (UFPA), Rua Augusto Correia, Nº1, Bairro Guamá, Belém, 66075-110, Pará, Brazil.
Laboratório de Ecologia e Conservação (LABECO), Instituto de Ciências Biológicas (ICB), Universidade Federal do Pará (UFPA), Rua Augusto Correia, Nº1, Bairro Guamá, Belém, 66075-110, Pará, Brazil; Programa de Pós-Graduação Em Ecologia (PPGECO), Instituto de Ciências Biológicas (ICB), Universidade Federal do Pará (UFPA), Rua Augusto Correia, Nº1, Bairro Guamá, Belém, 66075-110, Pará, Brazil.
J Therm Biol. 2024 Oct;125:103998. doi: 10.1016/j.jtherbio.2024.103998. Epub 2024 Oct 30.
Insect eco-physiological traits are important for understanding their distribution and habitat selection, especially in the face of land use change. We estimated the average temperature of the thoracic surface of 20 Odonata (Insecta) species and classified them into thermoregulation categories according to their preferences for sunny or shaded habitats to assess their temperature variation. We tested the influence of air temperature and six morphological metrics related to thorax and abdomen size. We expected that: (i) heliothermic species would have higher thoracic temperatures compared to thermoconformer species; (ii) Zygopterans, due to their smaller body size, are less efficient at maintaining a constant body temperature relative to the air when compared to anisopterans; (iii) thorax volume would cause an increase in Odonata thoracic temperature, and abdomen length would cause a decrease. The study was conducted at 18 Amazonian streams in Eastern Amazonia. We observed differences of 2.5 °C in thoracic temperature between heliothermic and thermoconformer species, as predicted in the first hypothesis. Both suborders, Zygoptera and Anisoptera, use different morphological and environmental variables to control temperature. While Zygoptera thoracic temperature oscillated near and below air temperature (-1.28 ± 0.62), Anisoptera maintained temperatures above air temperature (1.81 ± 1.96). Air temperature influenced only the increase in Zygoptera thoracic temperature, supporting our second hypothesis. The third hypothesis was corroborated for order Odonata, but partially for its suborders. Zygoptera thoracic temperature was only related to abdomen length, which was proportional to a temperature decrease. Anisoptera temperature showed a relationship only with thoracic metrics, especially thorax volume, which had a significant contribution to temperature increase. Despite the observed differences, which varied according to size, we noted exceptions in the thermal characteristics of some species that deviated from these predictions. Therefore, we emphasize the importance of considering the interaction of other eco-physiological aspects in dragonfly temperature regulation.
昆虫生态生理特征对于理解它们的分布和栖息地选择很重要，特别是在面对土地利用变化时。我们估计了 20 种蜻蜓目（昆虫）物种的胸表面平均温度，并根据它们对阳光或阴凉栖息地的偏好将它们分类为热调节类别，以评估它们的温度变化。我们测试了空气温度和与胸部和腹部大小相关的六个形态学指标的影响。我们预计：（i）与热适应物种相比，嗜热物种的胸温会更高；（ii）由于体型较小，相对于等翅目昆虫，翼手目昆虫在维持与空气恒定体温方面效率较低；（iii）胸体积会导致蜻蜓目胸温升高，而腹部长度会导致胸温降低。该研究在亚马逊东部的 18 条亚马逊溪流中进行。我们观察到嗜热物种和热适应物种的胸温差异为 2.5°C，这与第一个假设一致。两个亚目，翼手目和等翅目，使用不同的形态和环境变量来控制温度。虽然翼手目昆虫的胸温在空气温度附近波动（-1.28±0.62°C），但等翅目昆虫的胸温保持在空气温度以上（1.81±1.96°C）。空气温度仅影响翼手目昆虫胸温的升高，支持我们的第二个假设。第三个假设在蜻蜓目下成立，但在其亚目下部分成立。翼手目昆虫的胸温仅与腹部长度有关，腹部长度与温度下降成正比。等翅目昆虫的温度仅与胸部指标有关，特别是胸体积，胸体积对温度升高有显著贡献。尽管观察到了差异，这些差异因大小而异，但我们注意到一些物种的热特性存在例外，这些物种偏离了这些预测。因此，我们强调在蜻蜓类昆虫的体温调节中考虑其他生态生理方面相互作用的重要性。
