相关实验视频

Updated: Jan 11, 2026

Modeling the Size Spectrum for Macroinvertebrates and Fishes in Stream Ecosystems

Modeling the Size Spectrum for Macroinvertebrates and Fishes in Stream Ecosystems

Published on: July 30, 2019

解开密度依赖,尺寸依赖和环境影响对鱼群动态的影响

Alice Bordes¹, Martin Huret¹, Etienne Rivot²

¹DECOD (Ecosystem Dynamics and Sustainability), L'Institut Agro, IFREMER, INRAE, Plouzané, France.

The Journal of animal ecology

|November 10, 2025

概括

了解野生鱼群变化是生态系统管理的关键. 这项研究揭示了密度,尺寸和环境如何影响鱼和沙丁鱼的生存和招募,帮助可持续的渔业.

科学领域:

海洋生态海洋生态学
人口动态人口动态
渔业科学渔业科学

背景情况:

人口生产率是由人口统计率和内在/外在因素之间的复杂相互作用驱动的.
在物种的生命周期中研究这些相互作用至关重要,特别是在短寿命的物种,如小型海底鱼类.
以前的研究很少将密度,尺寸和环境影响整合到整个生命周期的人口统计率上.

研究的目的:

研究内在 (密度,大小) 和外在 (环境) 因素对欧洲鱼和沙丁鱼整个生命周期的人口统计率的相对影响.
开发一种基于年龄的生命周期模型,能够解开这些对短命物种的影响.
为基于生态系统的小 pelagic 鱼群管理提供见解.

主要方法:

开发了欧洲鱼 (Engraulis encrasicolus) 和欧洲鱼 (Sardina pilchardus) 的基于年龄的生命周期模型.
分析了密度依赖,尺寸依赖和环境因素对连续过渡率的影响.
利用大规模的环境指标,如大西洋多年周期振荡和北大西洋振荡.

主要成果:

鱼人口结构主要依赖密度,影响1岁和3岁的自然死亡率.
鱼的人口结构既取决于大小和密度,影响1岁和2岁的死亡率,以及招募.
两种物种的自然死亡率与主要气候波动 (AMO,NAO) 有显著的相关性.

结论:

该研究成功地将大小,密度和环境影响与野生鱼类整个生命周期中的多种人口统计过程相结合.
鱼和沙丁鱼种群对密度,大小和环境变化表现出不同的人口统计反应.
这种综合方法代表了改善小型海底鱼类渔业基于生态系统的管理战略的重要一步.

关键词:

比斯卡耶湾的比斯卡耶湾.密度依赖关系密度依赖关系综合人口动态模型.内在的外在因素是内在的因素.尺寸依赖性尺寸依赖性小小的海底鱼类鱼类.状态空间模型

更多相关视频

Development of New Methods for Quantifying Fish Density Using Underwater Stereo-video Tools

Development of New Methods for Quantifying Fish Density Using Underwater Stereo-video Tools

Published on: November 20, 2017

Automatic Image Processing to Determine the Community Size Structure of Riverine Macroinvertebrates

Automatic Image Processing to Determine the Community Size Structure of Riverine Macroinvertebrates

Published on: January 13, 2023

相关概念视频

Population Growth

Population Growth

Population size is dynamic, increasing with birth rates and immigration, and decreasing with death rates and emigration. In ideal conditions with unlimited resources, populations can increase exponentially, which plots as a J-shaped growth rate curve of population size against time. This type of curve is characteristic of newly-introduced invasive species, or populations that have suffered catastrophic declines and are rebounding.

Conservation of Small Populations

Conservation of Small Populations

Small population sizes put a species at extreme risk of extinction due to a lack of variation, and a consequent decrease in adaptability. This weakens the chances of survival under pressures such as climate change, competition from other species, or new diseases. Large populations are more likely to survive pressures such as these, as such populations are more likely to harbor individuals that have genetic variants that are adaptive under new stresses. Small populations are much less...

What are Populations and Communities?

What are Populations and Communities?

Speciation Rates

Speciation Rates

Testing a Claim about Mean: Known Population SD

Testing a Claim about Mean: Known Population SD

A complete procedure of testing the hypothesis about a population mean is explained here.
Estimating a population mean requires the samples to be distributed normally. The data should be collected from the randomly selected samples having no sampling bias. The sample size needed to be higher than 30, and most importantly, the population standard deviation should be already known.
In most realistic situations, the population standard deviation is often unknown, but in rare circumstances, when it...

Conservation of Declining Populations

Conservation of Declining Populations

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.