Differences between thermal preference and thermal performance in a wintry spider Mecicobothrium thorelli: Are the spiders under evolutionary pressures on their seasonal activity?

IF 1 4区 生物学 Q3 ZOOLOGY
Justina Panchuk, Leonela Schwerdt, N. Ferretti
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Abstract

Thermal preference and thermal performance are used to describe the thermal biology of an ectothermic organism through parameters, i.e., estimating locomotor performance by maximum running speed. In this study, we assessed the thermal preference and locomotor performance of the spider Mecicobothrium thorelli Holmberg, 1882, a wintry mygalomorph spider endemic to the native mountainous grasslands of central Argentina and Uruguay. The preferred temperatures of the 72.4% of the individuals were in the range of 10-20°C. The highest frequencies of preferred temperatures were 10-15 °C in males and 15-20°C in females. The sprint speed showed significant differences between all the temperatures evaluated and showed the highest speeds at 25 °C and the lowest at 3 °C. The optimal temperature was 26.09 °C which was significantly higher than the preferred temperature in both males and females. We concluded that M. thorelli selects a wide range of temperatures and prefers to stay in medium and low temperatures, which are correlated with winter activity in the wild. However, the species showed maximum speed at higher temperatures which implies that spiders would perform even better in nature and maximize their locomotion by being active during a warmer period.
一种冬栖蜘蛛的热偏好和热性能差异:这种蜘蛛的季节性活动是否受到进化压力?
热偏好和热性能用于通过参数描述外热生物的热生物学,即通过最大运行速度估计运动性能。在这项研究中,我们评估了1882年Meicobothrium thorelli Holmberg蜘蛛的热偏好和运动性能,这是一种冬季mygalomorph蜘蛛,原产于阿根廷中部和乌拉圭的原生山地草原。72.4%的个体的首选温度在10-20°C的范围内。首选温度的最高频率男性为10-15°C,女性为15-20°C。短跑速度显示出所有评估温度之间的显著差异,在25°C时速度最高,在3°C时最低。最适温度为26.09°C,显著高于雄性和雌性的首选温度。我们得出结论,M.thorelli选择的温度范围很广,更喜欢呆在中低温下,这与冬季野外活动有关。然而,该物种在更高的温度下表现出最大的速度,这意味着蜘蛛在自然界中会表现得更好,并通过在温暖的时期活跃来最大限度地移动。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Canadian Journal of Zoology
Canadian Journal of Zoology 生物-动物学
CiteScore
2.40
自引率
0.00%
发文量
82
审稿时长
3 months
期刊介绍: Published since 1929, the Canadian Journal of Zoology is a monthly journal that reports on primary research contributed by respected international scientists in the broad field of zoology, including behaviour, biochemistry and physiology, developmental biology, ecology, genetics, morphology and ultrastructure, parasitology and pathology, and systematics and evolution. It also invites experts to submit review articles on topics of current interest.
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