Weak effects on growth and cannibalism under fluctuating temperatures in damselfly larvae

Abstract

The Earth’s climate is changing with a trend towards higher mean temperatures and increased temperature fluctuations. Little attention has been paid to the effects of thermal variation on competition within species. Understanding the temperature-dependence of competition is important since it might affect dynamics within and between populations. In a laboratory experiment we investigated the effects of thermal variation on growth and cannibalism in larvae of a damselfly. The temperature treatments included three amplitudes between 20 and 26 °C with an average of 23 °C, and a constant control at 23 °C. Larvae were also raised at five constant temperatures for an estimation of the thermal performance curve, which showed that the thermal optimum for growth was 26.9 °C. Cannibalism was significantly positively correlated with initial body size variance. There was neither a difference among the temperature variation treatments, nor between the constant and the variation treatments in growth and cannibalism. Hence, positive and negative effects of temperature variation within the linear range of a species thermal performance curve might cancel each other out. Since our study mimicked natural temperature conditions, we suggest that the increase in temperature variation predicted by climate models will not necessarily differ from the effects without an increase in variation.

Effects of temperature and resource level on interspecific interactions in two species of Odonata larvae

“…The two temperatures used are within the range of natural temperatures in ponds where the eggs used in the experiments were collected. During the main growth season of the larvae, from June until September (Dijkstra & Lewington, 2006 ), the minimum and maximum water temperatures are 15.4 and 27.5°C, respectively (Holzmann et al., 2022 ): data from the pond where we collected Lestes sponsa , see below. The average for the whole growth season for ponds at this latitude is 17°C (Nilsson‐Örtman et al., 2012 ).…”