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小型鱼的运动模式表明,在一个碎片化,沙漠河流中的游牧生活

Martinique J Chavez^1,2, Phaedra Budy^3,4, Casey A Pennock⁵

¹Department of Watershed Sciences, Utah State University, Logan, UT, USA. martiniquechavez@gmail.com.

Movement ecology

|July 31, 2024

概括

临灭绝的里约格兰德银色小鱼 (RGSM) 表现出高度的流动性,可以进行长距离的运动,这挑战了现有的河流运动理论. 这些发现对于理解RGSM生态和恢复工作至关重要.

科学领域:

生态生态学生态生态学
鱼类学鱼类学鱼类学
保护生物学保护生物学

背景情况:

河流生态系统对于鱼类的移动至关重要,但水和排水造成的碎片化构成重大威胁.
临灭绝的里约格兰德银色小鱼 (Hybognathus amarus, RGSM) 居住在一个高度分散的范围,其运动生态不太了解.

研究的目的:

为了研究临灭绝的里约格兰德银色小鱼 (RGSM) 的运动生态.
在一个碎片化的河流系统中量化RGSM的移动模式和距离.
评估流行的河流运动理论对RGSM的适用性.

主要方法:

化场养的RGSM被被动集成回应器 (PIT) 标签标记,并使用固定和移动天线从2019年到2022年进行跟踪.
对于在水上方和水下方释放的RGSM,量化了移动概率和总移动距离.
对RGSM运动模式进行了对限制运动范式 (RMP) 和殖民周期假设 (CCH) 的评估.

主要成果:

超过36%的标记RGSM表现出运动,距离远远超过RMP预测.
长期检测到RGSM (平均75天),并旅行相当长的距离 (平均每年12.2河里,最大103公里).
移动模式对CCH上游偏差的支持很小,其中74%的移动方向是下游.

结论:

RGSM表现出高度的移动性和长距离移动的能力,挑战了简单的理论解释.
这些发现支持RGSM的游牧移动模式,这可能解释了尽管幼虫漂移,但人口持续存在.
了解RGSM运动生态对于有效的保护和定义恢复行动的适当规模至关重要.

关键词:

碎片化碎片化游牧运动是游牧人的运动.被动集成响应器 (PIT) 标签鱼-广播产卵的产卵时间小型体型的小鱼

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