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相关概念视频

Optimal Foraging00:48

Optimal Foraging

How animals obtain and eat their food is called foraging behavior. Foraging can include searching for plants and hunting for prey and depends on the species and environment.
Threats to Biodiversity01:50

Threats to Biodiversity

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...
Conservation of Small Populations02:04

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 likely to...
Conservation of Declining Populations02:07

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.
Habitat Fragmentation02:31

Habitat Fragmentation

Habitat fragmentation describes the division of a more extensive, continuous habitat into smaller, discontinuous areas. Human activities such as land conversion, as well as slower geological processes leading to changes in the physical environment, are the two leading causes of habitat fragmentation. The fragmentation process typically follows the same steps: perforation, dissection, fragmentation, shrinkage, and attrition.
Derivatives: Problem Solving01:26

Derivatives: Problem Solving

Temperature-Dependent Growth of Brook TroutThe growth of brook trout is closely influenced by water temperature. Experimental data demonstrate how trout weight changes over a 24-day period in response to varying water temperatures. At lower temperatures, such as 15.5 degrees Celsius, brook trout show significant weight gain. However, as the temperature increases, the amount of weight gained steadily decreases. At the highest temperature measured, 24.4 degrees Celsius, trout experience a net...

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相关实验视频

Updated: Jul 11, 2026

Data Collection on Marine Litter Ingestion in Sea Turtles and Thresholds for Good Environmental Status
13:18

Data Collection on Marine Litter Ingestion in Sea Turtles and Thresholds for Good Environmental Status

Published on: May 18, 2019

渔业抛弃率和海鸟群体的变化

Stephen C Votier1, Robert W Furness, Stuart Bearhop

  • 1Institute of Biomedical and Life Sciences, University of Glasgow, Glasgow G12 8QQ, UK. s.votier@bio.gla.ac.uk

Nature
|February 20, 2004
PubMed
概括
此摘要是机器生成的。

渔业丢弃对海鸟来说至关重要. 减少丢弃量,特别是当与低砂的可用性相结合时,可以迫使大捕食其他海鸟,威胁到种群.

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科学领域:

  • 海洋生态海洋生态学
  • 鸟类生态学 鸟类生态学
  • 渔业科学 渔业科学

背景情况:

  • 商业渔业废弃物是全球许多海鸟物种的重要食物来源.
  • 预测海鸟社区对抛弃波动的反应是复杂的,因为自然的生态变化.
  • 北海渔业正在经历变化,影响了抛弃率,影响了重要的海鸟种群.

研究的目的:

  • 调查渔业废弃物供应量与北海北部大 (Stercorarius skua) 捕捞废弃物的利用之间的关系.
  • 评估废弃物水平和猎物可用性的变化对大的食行为以及对其他海鸟群体的潜在威胁的影响.

主要方法:

  • 利用来自北海北部的长期数据集.
  • 分析了大的废弃物可用性和废弃物使用情况.
  • 检查了猎物的转换行为,以应对减少丢弃和 (Ammodytes marinus) 的可用性.

主要成果:

  • 建立了渔业废弃物可用性和大鱼废弃物消费之间的直接相关性.
  • 当丢弃率下降时,观察到大鱼对其他鸟类的掠夺性增加,特别是如果的可用性也很低.
  • 确定大鱼的猎物转换是与丢弃可用性相关的重要因素.

结论:

  • 巨型鱼表现出选择性的食,当渔业丢弃物稀少时,它们会转向其他海鸟的掠食.
  • 减少渔业丢弃对海鸟种群构成潜在威胁,因为大鱼等一般性物种的掠食性增加.
  • 渔业和海鸟保护的管理策略需要考虑复杂的捕食者-猎物动态,受废弃物可用性的影响.