哈德逊河美洲鲥鱼产卵物候的变化

IF 1.8 3区 农林科学 Q2 FISHERIES Marine and Coastal Fisheries Pub Date : 2024-10-22 DOI:10.1002/mcf2.10312
Hsiao-Yun Chang, Yong Chen
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引用次数: 0

摘要

目标 本研究旨在调查哈德逊河美洲鲥鱼产卵物候的潜在变化,并确定导致哈德逊河鲥鱼数量下降的因素。 方法 该研究利用了从长河鱼类调查中收集的美洲鲥鱼卵。我们采用逻辑模型来估算产卵表征指标,包括产卵季节的开始、高峰、停止和持续时间。此外,我们还研究了生物和非生物变量对产卵时间的影响。 结果 这项研究表明,产卵期开始的时间变化差异很大,且不显著。然而,产卵高峰和停止时间明显推迟,产卵期延长。此外,该研究结果表明,产卵开始时间与水温之间存在相关性,水温每升高 1°C,产卵开始时间就会提前 3.66 天。雌性产卵器较小与产卵高峰期和产卵停止期推迟有关。雌性产卵器平均尺寸每减小 1 厘米,产卵季节的高峰期就会推迟 1.79 天,产卵季节的结束期也会推迟 2.87 天。 结论 研究结果表明,水温可能是哈德逊河美洲鲥鱼开始产卵的关键触发因素,水温越高,产卵开始的时间越早。此外,研究结果表明,随着时间的推移,产卵高峰和产卵停止的时间逐渐推迟,这与雌性产卵者的大小有关。
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Shifting spawning phenology in Hudson River American Shad

Objective

The objectives of this study were to investigate potential shift in the phenology of spawning for the Hudson River American Shad Alosa sapidissima and to identify factors contributing to the decline of the Hudson River shad population.

Methods

This study utilized American Shad eggs collected from the Long River Ichthyoplankton Survey. Logistic models were employed to estimate spawning phenology metrics, including the onset, peak, cessation, and duration of the spawning season. Additionally, we investigated the effects of biotic and abiotic variables on spawning timing.

Result

This study suggests that temporal changes in the spawning onset exhibited high variation and were not significant. However, a significantly delayed spawning peak and cessation, along with an extended spawning season, were observed. Additionally, the findings of this study revealed a correlation between the timing of spawning onset and water temperature, indicating that a 1°C increase in water temperature was associated with a 3.66-day earlier initiation of spawning. Smaller female spawner size was associated with delayed peak and cessation of the spawning season. With a 1-cm decrease in the average female spawner size, the peak of the spawning season was delayed by 1.79 days and the cessation of the spawning season was delayed by 2.87 days.

Conclusion

The findings indicate that water temperature may be a crucial trigger for initiating spawning in Hudson River American Shad, with higher water temperatures associated with earlier spawning onset. Moreover, the findings indicate that the timing of spawning peaks and cessations has been progressively delayed over time, and this is linked to the size of female spawners.

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来源期刊
Marine and Coastal Fisheries
Marine and Coastal Fisheries FISHERIES-MARINE & FRESHWATER BIOLOGY
CiteScore
3.40
自引率
5.90%
发文量
40
审稿时长
>12 weeks
期刊介绍: Marine and Coastal Fisheries: Dynamics, Management, and Ecosystem Science publishes original and innovative research that synthesizes information on biological organization across spatial and temporal scales to promote ecologically sound fisheries science and management. This open-access, online journal published by the American Fisheries Society provides an international venue for studies of marine, coastal, and estuarine fisheries, with emphasis on species'' performance and responses to perturbations in their environment, and promotes the development of ecosystem-based fisheries science and management.
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