成熟溯河产卵Alewife(Alosa pseudoharengus)的河流和性别特异性年生存率

IF 0.7 4区 农林科学 Q4 FISHERIES Journal of Applied Ichthyology Pub Date : 2023-05-25 DOI:10.1155/2023/6376322
A. Spares, G. Robertson, M. Dadswell, Anna M. Calvert, S. Gutowsky, D. Fifield, Rachelle Vincent, N. McLellan, M. Stokesbury
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引用次数: 0

摘要

在2013年至2021年的多次年度产卵过程中,在加拿大芬迪湾Chignecto地峡的四条河流中,使用无源集成转发器(PIT)监测了9000多条成熟的溯河产卵alewife(Alosa pseudoharengus A.Wilson,1811)。2016年至2019年期间,384名被标记的个体的子样本年龄在3至6岁之间(平均 ± SD;4.2 ± 0.7 年,n = 232,男性;4.5 ± 0.7 年,n = 152,女性)。生物遥测显示,一个未固定的个体在标记后存活了7年,可能达到10-13岁 岁不同河流的回报率各不相同,受人类影响最严重的河流回报率最低。根据河流和年份的不同,使用生物遥测和老化数据来估计表观年生存率在0.25至0.50之间。根据对三条受影响较小河流的生物遥测数据的捕获标记再捕获(CMR)分析,估计的年总生存率为0.396,瞬时总死亡率(Z)为0.93,从放生时起的未来预期寿命为1.08 年。从所有四条研究河流中收集的4至6岁的阿列韦的频率分布估计,较低的年生存率为0.301,Z = 1.20,未来预期寿命为0.83 年。生物遥测检测率为0.89–0.98,但因河流和年份而异,2017-2018年期间一条河流的最低检测率可能与阻止上游鱼类通过的潮汐闸门故障和随后的检测有关。根据CMR,男性的存活率高于女性,这意味着总体平均存活率增加了0.05。Alewife在我们的研究中强调,需要有限的基于生态系统的管理期来缓解河流连通性和死亡率问题,以避免种群群的损失并降低灭绝风险。
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River- and Sex-Specific Annual Survival Rates of Mature Anadromous Alewife (Alosa pseudoharengus)
During multiple annual spawning runs from 2013 to 2021, over 9,000 mature anadromous alewife (Alosa pseudoharengus A. Wilson, 1811) were monitored with passive integrated transponders (PITs) in four rivers of the Chignecto Isthmus, Bay of Fundy, Canada. A subsample of 384 individuals tagged during 2016–2019 were aged from 3 to 6 years (mean ± SD; 4.2 ± 0.7 years, n = 232, males; 4.5 ± 0.7 years, n = 152, females). Biotelemetry revealed that one unsexed individual survived seven years post tagging, possibly making it 10–13 years old. Return rates varied among the rivers, with the lowest rates in the most anthropogenically impacted river. Biotelemetry and ageing data were used to estimate apparent annual survival rates ranging from 0.25 to 0.50 depending on the river and the year. Based on capture-mark-recapture (CMR) analysis of biotelemetry data from the three less impacted rivers, the estimated overall annual survival was 0.396, total instantaneous mortality (Z) was 0.93, and future life expectancy from time of release was 1.08 years. Frequency distribution of ages 4–6 for alewife pooled from all four study rivers estimated a lower annual survival rate of 0.301, Z = 1.20, and a future life expectancy of 0.83 years. The biotelemetry detection rates were 0.89–0.98 but varied depending on the river and the year, with the lowest rates in one river during 2017-2018 possibly related to a malfunctioning tide gate preventing upstream fish passage and subsequent detection. Based on CMR, males had a higher survival rate compared to females, which translated into an overall mean survival increase of 0.05. Alewife survivorship in our study highlighted that a limited ecosystem-based management period is required to mitigate river connectivity and mortality issues to avoid loss of population cohorts and decrease the risk of extirpation.
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来源期刊
Journal of Applied Ichthyology
Journal of Applied Ichthyology 生物-海洋与淡水生物学
CiteScore
2.30
自引率
11.10%
发文量
73
审稿时长
3-8 weeks
期刊介绍: The Journal of Applied Ichthyology publishes articles of international repute on ichthyology, aquaculture, and marine fisheries; ichthyopathology and ichthyoimmunology; environmental toxicology using fishes as test organisms; basic research on fishery management; and aspects of integrated coastal zone management in relation to fisheries and aquaculture. Emphasis is placed on the application of scientific research findings, while special consideration is given to ichthyological problems occurring in developing countries. Article formats include original articles, review articles, short communications and technical reports.
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