印度Point Calimere海洋重点生物多样性区系鱼类区系时空变化评价

IF 3 4区 环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES
R Abinaya, A Kanishkar, M K Sajeevan
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引用次数: 0

摘要

由于栖息地退化、过度开发、污染和气候变化,生物多样性的丧失正在以前所未有的速度扩大。关键生物多样性区在保护和空间规划中发挥着重要作用,以减少生物多样性丧失的不利影响。研究了2023年1月至2024年12月Calimere角野生动物保护区重点生物多样性区(PCWSKBA)内鱼类多样性的时空变化特征。本研究共鉴定出85科39目255种。鱼种数量最多的是Escualosa胸鱼(valciennes, 1847),占捕获鱼总数的7%,其次是Eleutheronema tetradactylum (Shaw, 1804)(4%)和Mugil cephalus Linnaeus(1758)(3.8%)。多样性指数显示,Kodiyakarai湿地(KW)的物种丰富度和丰度最高。与此同时,由于人为压力和环境限制,南太平洋的多样性较低。季风后季节多样性最大,这与季风降雨的养分输入相对应。k -优势度曲线表明,2023年样品的优势度浓度高于2024年样品。冗余分析(RDA)表明,溶解氧、盐度和磷酸盐营养水平显著影响鱼类在不同区域的分布。这项研究表明,增加磷酸盐和有机质水平可以通过促进藻类生长和为鱼类提供食物来源来提高生产力。然而,过度的养分富集会导致富营养化、氧气水平的耗尽,并促进机会主义物种的滋生,最终破坏生态系统的平衡。因此,有必要采取措施减少养分径流和有机污染,防止缺氧,保护生物多样性和生态健康。可持续的土地利用做法和加强水质监测有助于缓解养分超载,同时保持水生生态系统的生产力和多样性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Evaluation of spatio-temporal variation in fish fauna within the Point Calimere Marine Key Biodiversity Area, India.

Biodiversity loss is expanding at an unprecedented rate, owing to habitat degradation, overexploitation, pollution, and climate change. Key Biodiversity Areas (KBAs) play an essential role in conservation and spatial planning to reduce the detrimental effects of biodiversity loss. The present study examined the spatio-temporal variations in fish diversity within selected zones of the Point Calimere Wildlife Sanctuary Key Biodiversity Area (PCWSKBA) from January 2023 to December 2024. In this study, 255 species from 39 orders and 85 families were identified. Escualosa thoracata (Valenciennes, 1847) was the most abundant fish species, comprising 7% of the total number of fish collected, followed by Eleutheronema tetradactylum (Shaw, 1804) (4%) and Mugil cephalus Linnaeus, 1758 (3.8%). The diversity indices revealed that Kodiyakarai Wetland (KW) had the highest species richness and abundance. Simultaneously, the SC recorded lower diversity due to anthropogenic pressure and environmental constraints. The post-monsoon season had the greatest seasonal diversity, which corresponded to the input of nutrients from monsoon rain. The K-dominance curve indicated that the samples from 2023 exhibited a higher concentration of dominance than those from 2024. Redundancy analysis (RDA) revealed that dissolved oxygen, salinity, and phosphate nutrient levels significantly influenced fish distribution across various zones. This study suggests that increasing phosphate and organic matter levels may enhance productivity by promoting algal growth and by providing a food source for fishes. However, excessive nutrient enrichment can lead to eutrophication, depletion of oxygen levels, and promotion of opportunistic species that ultimately disrupt the ecosystem balance. Therefore, it is essential to implement measures to reduce nutrient runoff and organic pollution to prevent oxygen depletion and protect the biodiversity and ecological health of the PCWSKBA. Sustainable land-use practices and enhanced water quality monitoring can help mitigate nutrient overload while preserving the productivity and diversity of aquatic ecosystems.

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来源期刊
Environmental Monitoring and Assessment
Environmental Monitoring and Assessment 环境科学-环境科学
CiteScore
4.70
自引率
6.70%
发文量
1000
审稿时长
7.3 months
期刊介绍: Environmental Monitoring and Assessment emphasizes technical developments and data arising from environmental monitoring and assessment, the use of scientific principles in the design of monitoring systems at the local, regional and global scales, and the use of monitoring data in assessing the consequences of natural resource management actions and pollution risks to man and the environment.
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