Spawning run estimates and phenology for an extremely small population of Atlantic Sturgeon in the Marshyhope Creek–Nanticoke River system, Chesapeake Bay

IF 1.8 3区农林科学 Q2 FISHERIES

Marine and Coastal Fisheries Pub Date : 2024-07-02 DOI:10.1002/mcf2.10292

Nicholas Coleman, Dewayne Fox, Ashlee Horne, Nathan J. Hostetter, John Madsen, Michael O'Brien, Ian Park, Chuck Stence, David Secor

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引用次数: 0

Abstract

Objective

Once thought to be extirpated from the Chesapeake Bay, fall spawning runs of Atlantic Sturgeon Acipenser oxyrinchus have been rediscovered in the Marshyhope Creek (MC)–Nanticoke River (NR) system of Maryland, United States. High recapture rates in past telemetry surveys suggested a small population in the two connected tributaries. This study aims to generate estimates of abundance and understand within system connectivity for spawning runs in 2020 and 2021.

Methods

Data from mobile side-scan sonar surveys and detections of acoustically tagged adults on stationary telemetry receivers were analyzed in an integrated model to estimate spawning season abundance and examine run timing and system connectivity for this population. An array of acoustic receivers was deployed throughout the MC–NR system to monitor the movement of tagged fish during the spawning run period from mid-August to late October. Side-scan sonar surveys were conducted weekly in September in an area of high spawner aggregation to generate count data on spawning run abundance.

Result

In 2020 and 2021, 32 (95% credible interval [CRI] = 23–47) and 70 (95% CRI = 49–105) Atlantic Sturgeon, respectively, used the MC–NR system. The lower estimate for 2020 coincided with an earlier end to the spawning run related to cooler September temperatures in that year.

Conclusion

In both years, high spawning run connectivity between MC and the upper NR was observed. Overall, run estimates supported previous hypotheses that the MC–NR system supports a very small population and that both MC and the upper NR serve as important areas for spawning activity.

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切萨皮克湾沼泽溪-南蒂科克河水系中极小种群大西洋鲟的产卵量估计值和物候学研究

目标大西洋鲟Acipenser oxyrinchus曾被认为已从切萨皮克湾灭绝，但在美国马里兰州的沼泽溪（MC）-南蒂科克河（NR）水系中重新发现了大西洋鲟的秋季产卵群。过去遥测调查中的高重捕率表明，这两条相连支流中的种群数量较少。本研究旨在估算该种群在 2020 年和 2021 年产卵期的丰度，并了解该种群在系统内的连通性。研究方法通过一个综合模型分析移动侧扫声纳调查数据和固定遥测接收器对声学标签成鱼的探测数据，以估算该种群在产卵期的丰度，并研究该种群的产卵时间和系统连通性。在整个 MC-NR 系统中部署了声学接收器阵列，以监测 8 月中旬至 10 月下旬产卵期被标记鱼类的活动情况。结果在 2020 年和 2021 年，分别有 32 条（95% 可信区间 [CRI] = 23-47）和 70 条（95% 可信区间 [CRI] = 49-105）大西洋鲟鱼使用 MC-NR 系统。2020 年的估计值较低，这与该年 9 月气温较低导致产卵期提前结束有关。总体而言，产卵潮估计值支持了之前的假设，即 MC-NR 系统支持一个非常小的种群，而 MC 和上游 NR 都是产卵活动的重要区域。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Marine and Coastal Fisheries FISHERIES-MARINE & FRESHWATER BIOLOGY

CiteScore

3.40

自引率

5.90%

发文量

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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