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Spatiotemporal analysis of the daily growth traits of the prerecruits of a small pelagic fish in response to environmental drivers
Fisheries Oceanography ( IF 2.6 ) Pub Date : 2020-07-24 , DOI: 10.1111/fog.12489
Alejandra Hernández 1, 2 , Guido Plaza 2 , Jairo Gutiérrez 3 , Francisco Cerna 3 , Edwin J. Niklitschek 4
Affiliation  

A comparative analysis of daily growth patterns was carried out for prerecruits (PR) of Engraulis ringens, collected from spring to summer (2015–2016) in northern (18º25'S–24º40'S) and southern nursery areas (32º40'S–41º00'S) off the Chilean coast. Prerecruits ranged from 2.2 to 7.3 cm TL (4.27 ± 0.88) and from 27 to 102 days (54.68 ± 15.92) of age and were hatched mainly in spring 2015. Growth traits were addressed through otolith microstructure analysis to determine the increment width profiles (IW), back‐calculated growth rates (BIGR), and overall absolute growth rates (AGR), whereas the Chl–a and sea‐surface temperature (SST) variations were assessed by analyzing satellite and field‐based data. The IWs (5.42 ± 1.94 µm versus 1.02 ± 0.37 µm), BIGRs (1.02 ± 0.37 versus 0.72 ± 0.26 mm·day−1), and AGRs (0.93 ± 0.15 versus 0.62 ± 0.08 mm·day−1) were significantly higher in the northern than in the southern stocks. The SST ranged from 17°C to 23°C (19.42 ± 1.45) and from 12°C to 18°C (14.81 ± 1.31) and varied significantly between stocks and months, whereas the higher concentration of Chl–α (~8 mg/m3), occurred close to the shallow coastal areas irrespective of stocks. A parabolic relationship between the recent otolith growth rates (ROGR) (as a proxy of recent daily somatic growth rates) and SST recorded at the date of capture estimated a maximum ROGR of 13.4 µm·day−1 at 18°C. These results demonstrated that water temperature seemed to be an important daily growth controller for early juveniles of E. ringens in the Humboldt Current System and that the field‐based growth–temperature relationship obtained will contribute to future potential bioenergetics models for this important forage species.

中文翻译:

小型浮游鱼类对环境因素的响应前日生长特征的时空分析

对春季和夏季(2015-2016年)在智利海岸北部(18º25'S–24º40'S)和南部苗圃地区(32º40'S–41º00'S)采集的Engraulis ringens的日前生长规律进行了比较分析。招募的新兵年龄在2.2至7.3 cm TL(4.27±0.88)之间,年龄在27至102天(54.68±15.92)之间,主要在2015年春季孵化。生长特征通过耳石微结构分析确定增量宽度分布图(IW ),倒推计算的增长率(BIGR)和总的绝对增长率(AGR),而Chl-一个通过分析卫星和野外数据评估海表温度(SST)的变化。IW(5.42±1.94 µm对1.02±0.37 µm),BIGR(1.02±0.37对0.72±0.26 mm·天-1)和AGR(0.93±0.15对0.62±0.08 mm·天-1)明显更高。北部地区比南部地区要高。SST的范围从17°C到23°C(19.42±1.45),从12°C到18°C(14.81±1.31),并且在存量和月份之间变化显着,而较高的Chl–α(〜8 mg /米3),无论存量多大,都发生在浅海沿岸地区附近。最近的耳石生长速率(ROGR)(代表最近的每日体细胞生长速率)与捕获时记录的SST之间存在抛物线关系,在18°C时,最大ROGR为13.4 µm·day -1。这些结果表明,水温似乎是洪堡洋流系统中林格氏菌早期幼虫的重要日常生长控制因素,并且所获得的基于田间的生长温度关系将有助于该重要草料种类的未来潜在生物能模型。
更新日期:2020-07-24
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