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Daily, seasonal, and annual variability of temperature in streams inhabited by the endemic San Pedro Martir trout (Oncorhynchus mykiss nelsoni), in Baja California, Mexico, and the predicted temperature for the years 2025 and 2050
Journal of Limnology ( IF 1.673 ) Pub Date : 2021-05-25 , DOI: 10.4081/jlimnol.2021.2001
Iván Alejandro Meza-Matty , Gorgonio Ruiz-Campos , Luis Walter Daesslé , Arturo Ruiz-Luna , Álvaro Alberto López-Lambraño , Faustino Camarena-Rosales , Kathleen R. Matthews

The present study measured the daily, seasonal, and annual variability of the water temperature of streams in which the endemic rainbow trout, Oncorhynchus mykiss nelsoni, is distributed on the western slope of the Sierra San Pedro Mártir, Baja California, Mexico, between 1996 and 2019. The seasonal thermal interval and daily duration of summer temperatures above the thermal threshold for this trout subspecies (≥ 28°C) were determined in streams at different elevations (553, 1,220, and 2,080 masl, or meters above sea level). Temperatures ≥ 28°C were recorded at the study site on the stream with the lowest elevation (San Antonio de Murillos Creek) over an accumulated 365 h between June and September 2014, with the maximum temperature recorded there, 30.66 °C, making it the site most vulnerable to climate change. At the San Antonio de Murillos Creek, the average water temperature predicted by three models (GFDL R30, HadCM3, and Mote) for the year 2025 would be a non-lethal temperature, < 28 °C, for trout at a minimum elevation of 491-511 masl, while this was predicted to be 545-701 masl for the year 2050. Predicted hourly water temperatures of 28°C (non-lethal) may occur at minimum elevations of 868-898 masl in 2025 and at 908-1028 masl in 2050, reducing a 21-23% and 23-31% its current altitudinal distribution range, respectively, thus avoiding its presence at the type locality (San Antonio de Murillos).



中文翻译:

墨西哥下加利福尼亚州特有的San Pedro Martir鳟鱼(Oncorhynchus mykiss nelsoni)栖息的溪流中温度的每日,季节性和年度变化以及2025年和2050年的预测温度

本研究测量了地方性虹鳟Oncorhynchus mykiss nelsoni的溪流水温的每日,季节性和年度变化分布在1996年至2019年之间,分布在墨西哥下加利福尼亚的Sierra San PedroMártir的西坡上。确定了该鳟鱼亚种(≥28°C)的季节性热间隔和夏季持续温度高于热阈值的夏季持续时间在海拔不同的溪流(553、1,220和2,080 masl,或高于海平面的米)中。在2014年6月至2014年9月之间的365小时内,海拔最低的河道(圣安东尼奥·穆里洛斯溪)记录的温度≥28°C,记录的最高温度为30.66°C。该站点最容易受到气候变化的影响。在San Antonio de Murillos Creek,三个模型(GFDL R30,HadCM3和Mote)预测的2025年的平均水温将为非致死温度,<28°C,

更新日期:2021-05-25
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