相关实验视频
Updated: Jul 19, 2025

07:57
Necropsy-based Wild Fish Health Assessment
Published on: September 11, 2018
17.2K
鱼类着陆的历史变化表明,尼罗河三角洲湖泊的鱼类捕捞组成和生物多样性丧失发生了重大变化
Ahmed A Abdelhady1, Mohamed Samy-Kamal2, Khalaf H M Abdel-Raheem1
1Geology Department, Faculty of Science, Minia University, 61519 El-Minia, Egypt.
Marine pollution bulletin
|August 12, 2023
概括
尼罗河-三角洲湖泊的鱼群在过去30年中发生了变化,稀有物种减少,机会性鱼和鱼因耐受污染而繁荣. 这表明鱼类生物多样性发生了重大变化.
科学领域:
- 生态生态学 生态生态学
- 渔业 科学 渔业 科学
- 环境科学 环境科学
背景情况:
- 尼罗河-三角洲湖是经历环境变化的关键生态系统.
- 监测鱼类生物多样性对于了解生态系统健康和管理至关重要.
- 登陆成分 (LC) 数据为长期鱼群动态提供了洞察力.
研究的目的:
- 在尼罗河三角洲湖泊中,对30年来鱼类着陆成分 (LC) 进行定量分析.
- 为了确定鱼类目标物种的变化,并阐明负责的环境因素.
- 评估物种丰富度的变化以及污染对鱼群的影响.
主要方法:
- 对跨越30年的 (1991-2020) 登陆成分 (LC) 数据进行定量分析.
- 统计分析包括PERMANOVA (变量多变量分析) 来比较不同的时间间隔.
- 主要组件分析 (PCA) 用于可视化物种组成的变化.
主要成果:
- 观察到目标物种向底层机会性物种的显著转变 (P < 0.001).
- 确定了两个不同的间隔:1991-2002年 (以鱼和稀有物种为主) 和2003-2020年 (以机会性鱼和鱼为主).
- 人们注意到物种丰富度和稀有物种的着陆量有所下降,这可能是由于过度开发或增加了对污染的耐受性.
结论:
- 尼罗河和三角洲湖的鱼群已经从稀有物种转变为机会性物种,特别是鱼和鱼.
- 机会主义物种的成功与它们对污染相关缺氧的耐受性有关.
- 环境变化,包括污染,正在推动鱼类生物多样性和社区结构的重大变化.
相关概念视频
What is Biodiversity?
27.5K
Biodiversity describes the variety of living things at multiple organizational levels: genetic, species and ecosystem diversity. Species diversity includes all branches of the evolutionary tree from single-celled prokaryotic organisms, bacteria, and archaea, to the eukaryotic kingdoms: plants; animals; fungi; and protists. To date, there have been about 1.75 million species identified, and new species are discovered every week.
27.5K
Sustainable Development
13.3K
As the human population continues to grow and use resources, we must be mindful of our planet’s natural limits. Sustainable development provides a pathway to maintain and improve human life now while also ensuring that future generations will have the resources that they need. The long-term success of sustainability efforts rests on understanding the interplay between human actions and ecological systems.
13.3K
Threats to Biodiversity
22.4K
There have been five major extinction events throughout geological history, resulting in the elimination of biodiversity, followed by a rebound of species that adapted to the new conditions. In the current geological epoch, the Holocene, there is a sixth extinction event in progress. This mass extinction has been attributed to human activities and is thus provisionally called the Anthropocene. In 2019 the human population reached 7.7 billion people and is projected to comprise 10 billion by...
22.4K
Osmoregulation in Fishes
49.9K
When cells are placed in a hypotonic (low-salt) fluid, they can swell and burst. Meanwhile, cells in a hypertonic solution—with a higher salt concentration—can shrivel and die. How do fish cells avoid these gruesome fates in hypotonic freshwater or hypertonic seawater environments?
49.9K
Speciation Rates
21.3K
Overview
21.3K
Conservation of Declining Populations
9.7K
Conservation of declining population focuses on ways of detecting, diagnosing, and halting a population decline. The approach uses methods to prevent populations from going extinct.
9.7K

