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Updated: Jun 11, 2025

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评估多年生两鱼管理的生命阶段内和生命阶段间密度依赖的动态

Ben R J Crichton^1,2, Michael J H Hickford^1,3, Angus R McIntosh²

¹Marine Ecology Research Group, School of Biological Sciences, University of Canterbury, Christchurch, New Zealand.

Ecological applications : a publication of the Ecological Society of America

|October 4, 2024

概括

密度依赖的过程对于渔业管理至关重要. 这项研究表明,在生命阶段内和生命阶段之间,密度依赖的相互作用显著调节鱼群,影响生存和生长.

科学领域:

生态生态学生态生态学
渔业科学渔业科学
人口动态人口动态

背景情况:

补偿密度依赖 (DD) 过程是渔业管理的基础,但往往被孤立地评估.
仅针对特定生命阶段评估DD过程可能会导致不准确的人口限制评估.
了解跨生命阶段的复杂DD相互作用对于有效的渔业管理至关重要.

研究的目的:

评估生命期内和生命期间DD相互作用在多年生淡水鱼种群动态中的相对作用.
调查渔业对科科普 (Galaxias spp.) 的影响. 人口动态,专注于小规模和大规模类别.
为了确定密度的变化如何影响不同大小类的Kokopu的明显生存和生长.

主要方法:

两年来,在被捕鱼和不捕捞的河流中监测两动物带状,巨型和短的科科普群.
使用标记回收数据来分析捕捞对科科普密度的影响.
调查科科普密度与明显的生存/生长之间的关系,控制息地特征.

主要成果:

没有捕获的河流表现出较大的小科科普生物质,特别是在捕鱼季后.
尽管在封闭区域增加了新兵的涌入,但在河流类型之间没有观察到大科科普生物质的显著差异.
生命期内和生命期间的DD竞争和掠食,特别是大鱼的掠食,是科科普人口统计的关键调节者.

结论:

捕捞后幼虫减少了新兵的涌入,但没有导致成年科科普群体的招募限制.
跨生命阶段的密度依赖相互作用,包括竞争和掠食,对于调节迁徙淡水鱼种群至关重要.
渔业管理必须纳入招聘依赖性和复杂的生命阶段间的相互作用,以实现可持续的种群持续存在.

关键词:

竞争竞争竞争竞争竞争竞争这种鱼是二面体鱼 (diadromous fish).它是反复复的,反复复的.长寿长寿是一个问题.人口动态人口动态保护区保护区保护区招聘工作招聘工作招聘工作

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