The effects of ENSO on spatial-temporal distribution and growth rate of three cryptic mullet species in Taiwan

IF 2.3 2区 农林科学 Q2 FISHERIES
Yu-Ling Nien , Nan-Jay Su , Ching-Ping Lu , Hsueh-Jung Lu , Chia-Hui Wang
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Abstract

This study investigates the impact of ENSO on the species composition and growth during the early-life history of three cryptic mullet species (NWP1–3) in the estuaries around Taiwan. Juvenile mullets were identified using genetic method, and their growth rates were analyzed using generalized additive models (GAMs) based on biological and environmental variables. The results found that NWP2 was the most abundant species, dominating several months and estuaries. NWP1 had lower abundance than NWP2, but its proportion was relatively higher in La Niña and rarer in El Niño. NWP3 exhibited the lowest abundance, but expanded spatially during El Niño. Moreover, the growth of juvenile mullet was influenced by multiple factors annually, especially sea surface temperature (SST) and drifting growth rate (DGR). The environmental changes induced by ENSO and species-specific traits simultaneously impact both the distribution and growth patterns of cryptic mullet species. Both these factors directly influence species composition and indirectly affect species abundance by modifying growth and mortality rates. Consequently, lower SST during La Niña year benefited the abundance and growth of NWP1, while higher SST during El Niño year benefited NWP3 population. Although NWP2 maintained high abundance annually, rising SST may impact the growth of this species. These findings underscore the critical role of interannual environmental variability in regulating the distribution, abundance, and growth during the early life stages of cryptic mullet species in subtropical estuarine systems.
ENSO对台湾三种隐鲻鱼时空分布及生长速率的影响
本研究探讨ENSO对台湾沿岸河口三种隐鲻鱼(NWP1-3)早期生活史的物种组成及生长的影响。采用遗传方法对鲻鱼幼鱼进行鉴定,并利用基于生物和环境变量的广义加性模型(GAMs)对其生长速率进行分析。结果发现,NWP2是最丰富的物种,在几个月和河口占主导地位。NWP1丰度低于NWP2,但在La Niña中所占比例相对较高,在El Niño中较少。NWP3丰度最低,但在El Niño期间呈空间扩张趋势。此外,鲻鱼幼鱼的生长受多种因素的影响,尤其是海温(SST)和漂流生长率(DGR)。ENSO引起的环境变化和物种特异性性状同时影响隐鲻鱼的分布和生长模式。这两个因素都直接影响物种组成,并通过改变生长和死亡率间接影响物种丰度。因此,La Niña年较低的海温有利于NWP1种群的丰度和生长,而El Niño年较高的海温有利于NWP3种群。尽管NWP2每年都保持高丰度,但海温的上升可能会影响该物种的生长。这些发现强调了在亚热带河口系统中,年际环境变异在调节隐鲻鱼的分布、丰度和早期生长过程中的关键作用。
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来源期刊
Fisheries Research
Fisheries Research 农林科学-渔业
CiteScore
4.50
自引率
16.70%
发文量
294
审稿时长
15 weeks
期刊介绍: This journal provides an international forum for the publication of papers in the areas of fisheries science, fishing technology, fisheries management and relevant socio-economics. The scope covers fisheries in salt, brackish and freshwater systems, and all aspects of associated ecology, environmental aspects of fisheries, and economics. Both theoretical and practical papers are acceptable, including laboratory and field experimental studies relevant to fisheries. Papers on the conservation of exploitable living resources are welcome. Review and Viewpoint articles are also published. As the specified areas inevitably impinge on and interrelate with each other, the approach of the journal is multidisciplinary, and authors are encouraged to emphasise the relevance of their own work to that of other disciplines. The journal is intended for fisheries scientists, biological oceanographers, gear technologists, economists, managers, administrators, policy makers and legislators.
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