Trophic ecology of a highly abundant pelagic fish (Trachurus lathami) in a coastal marine ecosystem (39º - 42º S; Southwest Atlantic) related to environmental variability

IF 2.3 2区农林科学 Q2 FISHERIES

Fisheries Research Pub Date : 2025-06-13 DOI:10.1016/j.fishres.2025.107443

Aylén M. Fernández Abud , Daniela Alemany , Claudio César Buratti , Brenda Temperoni

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Abstract

This study aimed to assess the feeding habits of rough scad T. lathami, an important pelagic fish in a Southwest Atlantic coastal marine ecosystem (El Rincón, 39º-42º S), during early (ES) and late (LS) spring of 2019. Trophic incidence (TI), relative importance (% RI) of prey items in stomach contents (n = 279), feeding strategy, ontogenetic shift in diet (multiple hypothesis modelling), and the relationship of diet with zooplankton abundance and with oceanographic conditions (multivariate analyses) were determined. Trophic incidence varied between ES (49 %) and LS (77 %), with a greater diversity of prey in the environment and the stomachs during the latter. Planktonic crustaceans prevailed, with copepods as the dominant prey in both spring periods (ES: RI 99 %; LS: RI 86 %). Large copepods (> 1 mm) dominated in ES, whereas small copepods (< 1 mm) dominated in LS. Amphipods, pteropods, bivalve larvae, decapod larvae, mysidaceans and bony fish remains were rare prey (% RI < 10). Feeding strategy analysis suggested a specialization at a population level on copepods (filter-feeding) and the occasional ingestion of other prey (active predation). A moderate correlation was observed between the diet and bottom temperature, thus suggesting their potential influence on rough scad feeding habits. Results highlight the opportunistic behaviour of rough scad in matching its diet to the most abundant prey in the environment, reflecting its plasticity in adapting to their short-time variations.

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沿海海洋生态系统（39º- 42ºS）中上层鱼类（沙龙）的营养生态学；西南大西洋)与环境变异性有关

本研究旨在评估2019年春初（ES）和春末（LS）西南大西洋沿海海洋生态系统（El Rincón, 39º-42ºS）中重要的中上层鱼类rough scad T. lathami的摄食习性。确定了胃内容物中猎物的营养发生率（TI）、相对重要性（% RI）（n = 279）、摄食策略、饮食中的个体发生变化（多重假设模型）以及饮食与浮游动物丰度和海洋条件的关系（多变量分析）。营养发生率在ES（49 %）和LS（77 %）之间变化，后者在环境和胃中猎物的多样性更大。两个春季以浮游甲壳类动物为主，桡足类为优势猎物(ES: RI 99 %；Ls: ri 86 %)。大型桡足类动物1 mm)在ES中占优势，而小型桡足类(<；1 mm)在LS中占优势。片足类、翼足类、双壳类、十足类、mysidaceae和硬骨鱼的残骸是罕见的猎物(% RI <；10)。捕食策略分析表明，桡足类动物在种群水平上具有专属性（滤食性），偶尔捕食其他猎物（主动捕食）。饲料与底部温度之间存在适度的相关性，这表明它们对粗砂鱼的摄食习性有潜在的影响。结果强调了粗棘鱼的机会主义行为，将其饮食与环境中最丰富的猎物相匹配，反映了其适应短期变化的可塑性。

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来源期刊

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.