Sánchez-Ovando J Pablo, Díaz Fernando, Angeles-Gonzalez Luis Enrique, Lafarga-De la Cruz Fabiola, Benítez-Villalobos Francisco, Re-Araujo Denise
Laboratorio de Ecofisiología de Organismos Acuáticos, Departamento de Biotecnología Marina, Centro de Investigación Científica y de Educación Superior de Ensenada (CICESE), Baja California, 22860, Mexico.
Laboratorio de Ecofisiología de Organismos Acuáticos, Departamento de Biotecnología Marina, Centro de Investigación Científica y de Educación Superior de Ensenada (CICESE), Baja California, 22860, Mexico.
J Therm Biol. 2025 Aug;132:104228. doi: 10.1016/j.jtherbio.2025.104228. Epub 2025 Aug 17.
Temperature influences the physiological performance of marine ectotherms-affecting survival, growth, and reproduction-and ultimately shaping their distribution. However, knowledge of how ocean warming will impact sessile ectotherms, such as serpulid polychaetes, remains limited. We hypothesize that rising ocean temperatures will affect serpulid thermal performance, potentially altering their distribution patterns. By combining laboratory-derived ecophysiological data with satellite sea-surface temperature (SST) data, we evaluated the effects of ocean warming on the distribution of two serpulid species from distinct regions: the temperate northern Pacific (Spirobranchus spinosus) and the tropical eastern Pacific (Spirobranchus cf. corniculatus). Adult worms were collected from the wild and acclimated for 30 days at different temperature ranges (11-20 °C for S. spinosus; 24-33 °C for S. cf. corniculatus) to assess thermal tolerance limits (CTmax, CTmin), thermal tolerance window, optimal temperature, and thermal safety margins. These physiological data were integrated with SST data to model potential distributions for both present (2010-2020) and future (2090-2100, SSP5-8.5) climate change scenario. Thermal tolerance limits increased with acclimation temperatures in both species. However, S. cf. corniculatus exhibited similar CTmax (35.1 °C) values at 30 and 33 °C, suggesting it is approaching its upper thermal limits. Both species exhibited narrow thermal windows (S. spinosus: 37 °C; S. cf. corniculatus: 71 °C), characteristic of stenothermic species. The optimal temperatures were 14 °C for S. spinosus and 30 °C for S. cf. corniculatus. By century's end, thermal safety margins are predicted to decrease, leading to range retractions in S. spinosus and potential poleward expansions in S. cf. corniculatus. These findings underscore the importance of integrating physiological and environmental data to assess the vulnerability of sessile ectotherms to climate change. Although other factors such as pH, currents, and oxygen may influence future distributions, this study provides an important first step toward understanding climate change impacts on sessile marine ectotherms.
温度影响海洋变温动物的生理表现，进而影响其生存、生长和繁殖，并最终决定它们的分布。然而，关于海洋变暖将如何影响固着性变温动物（如螺旋虫多毛类）的了解仍然有限。我们假设海洋温度上升将影响螺旋虫的热性能，有可能改变它们的分布模式。通过将实验室得出的生态生理数据与卫星海面温度（SST）数据相结合，我们评估了海洋变暖对来自不同区域的两种螺旋虫物种分布的影响：北太平洋温带地区的（棘刺螺旋虫）和东太平洋热带地区的（近似角螺旋虫）。从野外采集成年蠕虫，并在不同温度范围（棘刺螺旋虫为11 - 20°C；近似角螺旋虫为24 - 33°C）下驯化30天，以评估热耐受极限（CTmax、CTmin）、热耐受窗口、最适温度和热安全边际。这些生理数据与SST数据相结合，为当前（2010 - 2020年）和未来（2090 - 2100年，SSP5 - 8.5情景）气候变化情景模拟潜在分布。两种物种的热耐受极限均随驯化温度升高而增加。然而，近似角螺旋虫在30°C和33°C时表现出相似的CTmax（35.1°C）值，表明它正在接近其热上限。两种物种均表现出狭窄的热窗口（棘刺螺旋虫：37°C；近似角螺旋虫：71°C），这是狭温性物种的特征。棘刺螺旋虫的最适温度为14°C，近似角螺旋虫的最适温度为30°C。到本世纪末，预计热安全边际将降低，导致棘刺螺旋虫的分布范围退缩，近似角螺旋虫可能向极地扩张。这些发现强调了整合生理和环境数据以评估固着性变温动物对气候变化脆弱性的重要性。尽管其他因素如pH值、洋流和氧气可能影响未来分布，但本研究为理解气候变化对固着性海洋变温动物的影响迈出了重要的第一步。
