Effects of fishing and environmental parameters on the commercial bony fish assemblage in the southern Caspian Sea

IF 0.9 4区环境科学与生态学 Q4 OCEANOGRAPHY

Oceanological and Hydrobiological Studies Pub Date : 2022-03-25 DOI:10.26881/oahs-2022.1.08

Hasan Fazli,Farhad Kaymaram,Gholam Reza Daryanabard

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引用次数: 0

Abstract

Since the 1990s, anthropogenic activities have been the major direct or indirect threats to the structural and functional organization of the unique ecosystem of the Caspian Sea (CS). This study attempts to investigate the relationships between fish community structure and environmental parameters and to analyze the Abundance Biomass Comparison (ABC) in the CS. The input data, including catch data by species and environmental parameters, were collected from 1996 to 2017. Of the 13 bony fish species identified, only two species Rutilus kutum and Chelon aurata accounted for 47.14% and 62.65%, and 40.80% and 29.34% of CPUE and NPUE, respectively. DisTLM revealed that five environmental variables showed a significant linear relationship with the NPUE resemblance matrix. Based on the AIC criteria, the combination of year, precipitation, SST_Apr, SSL, SST, GTA, Iranian rivers, and Volga discharges explain 80.3% of the total variability. Based on the ABC curves and W statistics, it was concluded that the fish assemblage was environmentally stressed from 1996 to 2003. The Shannon diversity index (H´) showed a decreasing trend, suggesting that fish species have been exposed to increasing stress over the past 22 years. Considering the current environmental conditions (downward trend in SSL river discharge and increase in SST) and anthropogenic activities, it appears that the downward trend will continue in the future.

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捕捞和环境参数对里海南部商业硬骨鱼种群的影响

自20世纪90年代以来，人为活动已成为里海独特生态系统结构和功能组织的主要直接或间接威胁。本研究探讨了长江流域鱼类群落结构与环境参数的关系，并分析了丰度生物量比较(ABC)。输入数据收集于1996年至2017年，包括按物种和环境参数划分的捕捞数据。在已鉴定的13种硬骨鱼中，鹦鹉螺(Rutilus kutum)和金龟螺(Chelon aurata)分别占CPUE和NPUE的47.14%和62.65%，分别占40.80%和29.34%。DisTLM显示，5个环境变量与NPUE相似矩阵呈显著的线性关系。基于AIC标准，年、降水、SST_Apr、SSL、SST、GTA、伊朗河流和伏尔加河流量的组合解释了总变率的80.3%。根据ABC曲线和W统计，1996 ~ 2003年该鱼类群落处于环境胁迫状态。Shannon多样性指数(H´)呈下降趋势，表明鱼类在过去22年中所面临的压力不断增加。考虑到当前的环境条件(松江流量呈下降趋势，海表温度呈上升趋势)和人为活动，未来的下降趋势将继续下去。

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来源期刊

Oceanological and Hydrobiological Studies 地学-海洋学

CiteScore

1.70

自引率

11.10%

发文量

审稿时长

>12 weeks

期刊介绍： Oceanological and Hydrobiological Studies is an international journal published by the Institute of Oceanography, University of Gdańsk in Poland. The journal has 4 issues per year and contains papers on all aspects of the marine environment and hydrobiology. All manuscripts are reviewed by editors and independent experts. Based on the referees'' recommendations, the Editor will make a decision on whether to accept a contribution. All articles are published in English. The journal is open to all matters concerning the water environment, thus providing the readers with a wide spectrum of topics in every issue.