The Hudson River currently supports the largest population of Atlantic Sturgeon Acipenser oxyrinchus in the United States despite currently supporting less than 1% of historic abundance. Federally listed as endangered throughout much of their range, Atlantic Sturgeon are still impacted by multiple threats, resulting in habitat destruction or direct mortality that has inhibited the rebuilding of populations despite more than 20 years without direct fishing pressure. To assist in management and reduction in anthropogenic impacts to adult Atlantic Sturgeon in the Hudson River, we have examined sex-specific patterns related to spawning. Utilizing hundreds of adult Atlantic Sturgeon telemetered along the Atlantic coast and an extensive passive acoustic array from 2010 to 2016, we were able to estimate arrival, departure, and duration of occupancy for four segments of the Hudson River for male, female, and unknown-sex individuals. Male Atlantic Sturgeon arrived above river kilometer (RKM; RKM 0 = Battery Park, New York) 100 at an average date of May 27, 12 d prior to females on June 8. While there were only a few significant differences in the timing of departure, the average date from RKM 100 was July 11 for males, June 29 for females, and July 23 for unknown-sex individuals, as such occupancy was significantly longer for male Atlantic Sturgeon. This study shows that female Atlantic Sturgeon often spawned in consecutive years and had much shorter mean intervals between spawning appearances (females 1.66 years, males 1.28 years) than the historical literature suggests. While the timing of spawning is consistent with the historic record, we provide a timeline with finer resolution and much greater detail for adults in the Hudson River, as well as update the historic estimate of spawning return rates. Conservation measures to reduce direct impacts to spawning habitat and mature Atlantic Sturgeon would likely provide the most benefit if conducted between mid-May through the end of July.

中文翻译：

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哈德逊河成年大西洋鲟的产卵间隔、时间和河流栖息地利用

哈德逊河目前养育着最大的大西洋鲟Acipenser oxyrinchus在美国，尽管目前仅支持不到 1% 的历史丰度。尽管 20 多年没有直接捕捞压力，大西洋鲟鱼在其大部分范围内被联邦政府列为濒危物种，但仍受到多种威胁的影响，导致栖息地破坏或直接死亡，抑制了种群的重建。为了帮助管理和减少对哈德逊河成年大西洋鲟鱼的人为影响，我们研究了与产卵相关的特定性别模式。利用从 2010 年到 2016 年沿大西洋海岸遥测的数百条成年大西洋鲟鱼和广泛的无源声学阵列，我们能够估计哈德逊河四个部分的男性、女性和未知的到达、离开和占用时间。性个体。雄性大西洋鲟到达河流千米以上 (RKM；RKM 0 = 纽约炮台公园) 100 平均日期为 5 月 27 日，比雌性 6 月 8 日早 12 天。虽然出发时间只有一些显着差异，从 RKM 100 开始，男性的平均日期为 7 月 11 日，女性为 6 月 29 日，性别未知的个体为 7 月 23 日，因为男性大西洋鲟的入住时间明显更长。这项研究表明，雌性大西洋鲟通常连续产卵，并且产卵出现的平均间隔（雌性 1.66 年，雄性 1.28 年）比历史文献表明的要短得多。虽然产卵时间与历史记录一致，但我们为哈德逊河的成年人提供了一个具有更精细分辨率和更多细节的时间表，以及更新产卵回报率的历史估计。如果在 5 月中旬至 7 月底之间采取保护措施，以减少对产卵栖息地和成熟大西洋鲟的直接影响，可能会带来最大的好处。