保加利亚多瑙河下游年度鲟鱼（鲟鱼科）的下游迁徙

Q3 Environmental Science

Biodiversity Pub Date : 2022-04-03 DOI:10.1080/14888386.2022.2099462

S. Mihov, B. Margaritova, Veselin Koev

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引用次数: 1

摘要

摘要：2014年至2021年，在多瑙河396公里处连续8年监测了四种鲟鱼（白鲟、星鲟、盖尔登斯泰迪鲟和胡索鲟）的年度幼鱼下游迁徙情况。在整个期间，共登记了713个同比标本。每年最频繁的移民是A.ruthenus，在8年中有6年被观察到。在第一次下游迁徙期间，数量最多的年轻鲟鱼是A.ruthenus，共有599个标本，其次是A.stellatus。在整个时期，胡索物种只有7个标本被登记。天然杂交种A.ruthenus×A.stellatus的发生频率较高。一个A.gueldenstaedtii的年环比标本在多瑙河下游10年后被登记，但没有检测到。所有鲟鱼物种在整个时期的单位努力渔获量（CPUE/10公顷）为0.346。本文提出了一种考虑研究区域的CPUE计算方法，目的是确保多瑙河下游国家之间监测数据的可比性。还提出了更好地保护已确定的苗圃场地的建议。

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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Downstream migration of young-of-the-year sturgeons (Acipenseridae) in the Lower Danube River, Bulgaria

ABSTRACT The downstream migration of young-of-the-year (YoY) of four sturgeon species (Acipenser ruthenus, A. stellatus, A. gueldenstaedtii and Huso huso) was monitored in the Danube at river km 396 in 8 continuous years (2014–2021). A total of 713 YoY specimens were registered for the whole period. The most frequent migrant on an annual basis was A. ruthenus, observed in 6 out of 8 years. The most abundant young sturgeons during the first downstream migration were A. ruthenus with 599 specimens, followed by A. stellatus. For the species H. huso, only 7 specimens were registered for the entire period. The natural hybrids A. ruthenus × A. stellatus were quite frequent. One YoY specimen of A. gueldenstaedtii was registered after 10 years with no detections in the Lower Danube River. The catch per unit effort (CPUE/10 ha) was 0.346 for the whole period for all sturgeon species. This paper suggests a method for calculating the CPUE taking into account the studied area, with the goal of ensuring comparability of monitoring data between the countries of the Lower Danube. Recommendations are also made for better protection of the identified nursery site.

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来源期刊

Biodiversity Environmental Science-Nature and Landscape Conservation

CiteScore

1.80

自引率

0.00%

发文量

期刊介绍： The aim of Biodiversity is to raise an appreciation and deeper understanding of species, ecosystems and the interconnectedness of the living world and thereby avoid the mismanagement, misuse and destruction of biodiversity. The Journal publishes original research papers, review articles, news items, opinion pieces, experiences from the field and book reviews, as well as running regular feature sections. Articles are written for a broad readership including scientists, educators, policy makers, conservationists, science writers, naturalists and students. Biodiversity aims to provide an international forum on all matters concerning the integrity and wellness of ecosystems, including articles on the impact of climate change, conservation management, agriculture and other human influence on biodiversity.