Marchessaux Guillaume, Lüskow Florian, Bejean Mickaël, Pakhomov Evgeny A
Department of Earth and Marine Science, University of Palermo, Viale delle Scienze, 90128 Palermo, Italy.
Department of Earth, Ocean and Atmospheric Sciences, University of British Columbia, 2039-2207 Main Mall, Vancouver, BC V6T 1Z4, Canada.
Biology (Basel). 2022 Jul 23;11(8):1100. doi: 10.3390/biology11081100.
The freshwater jellyfish Craspedacusta sowerbii is among the most widespread invasive species, observed across a wide temperature range. The aim of this study is to analyze the polyp and medusa stages response to different temperatures by using (i) an experimental study on the polyp colony growth at 19 and 29 °C, and (ii) prediction of the Thermal Habitat Suitability (THS) based on the thermal tolerance of the medusa stage. The total number of polyps and colonies was greater at high temperature. At 19 °C, colonies with 1 to 5 polyps were present, with colonies of 1 to 3 polyps numerically dominating. At 29 °C, colonies were 80% composed of 1- to 2-polyps. Based on the published medusa pulsation rhythm data, a Thermal Performance Curve (TPC) regression was performed and used to monthly predict the THS for current and future (2050 and 2100) scenarios. The southern hemisphere offered optimal conditions (THS > 0.6) year-round. In the northern hemisphere, the optimum period was predicted to be between June and September. The future THS were considerably larger than at present with an increase in optimal THS at higher latitudes (up to 60° N). The combination of experimental and modeling approaches allows to identify the optimal thermal conditions of the polyp and medusa stages and to predict their invasive capacities.
桃花水母是分布最为广泛的入侵物种之一，在很宽的温度范围内都有发现。本研究的目的是通过以下方式分析水螅体和水母体阶段对不同温度的反应：（i）在19℃和29℃下对水螅群体生长进行实验研究，以及（ii）基于水母体阶段的热耐受性预测热栖息地适宜性（THS）。高温下息肉和群体的总数更多。在19℃时，存在由1至5个息肉组成的群体，其中1至3个息肉的群体在数量上占主导。在29℃时，80%的群体由1至2个息肉组成。根据已发表的水母体脉动节律数据，进行了热性能曲线（TPC）回归，并用于逐月预测当前和未来（2050年和2100年）情景下的THS。南半球全年提供最佳条件（THS>0.6）。在北半球，预计最佳时期为6月至9月。未来的THS比目前大得多，在较高纬度地区（北纬60°）最佳THS有所增加。实验和建模方法的结合有助于确定水螅体和水母体阶段的最佳热条件，并预测它们的入侵能力。
