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首页> 外文期刊>Transactions of the American Fisheries Society >Fish Assemblage Shifts and Population Dynamics of Smallmouth Bass in the Beaver Archipelago, Northern Lake Michigan: A Comparison between Historical and Recent Time Periods amidst Ecosystem Changes
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Fish Assemblage Shifts and Population Dynamics of Smallmouth Bass in the Beaver Archipelago, Northern Lake Michigan: A Comparison between Historical and Recent Time Periods amidst Ecosystem Changes

机译：密歇根湖北海狸群岛小嘴鲈鱼的鱼群移动和种群动态：生态系统变化中历史与近期的比较

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摘要

The ecological and economic importance of Great Lakes nearshore areas and the paucity of information on nearshore Lake Michigan fish assemblages prompted us to document changes that occurred from a historical time period (1969-1972, 1975, 1977, and 1984) to a recent period (2005-2008) in a nearshore northern Lake Michigan (Beaver Archipelago) fish assemblage, with an emphasis on smallmouth bass Micropterus dolomieu. From historical to recent periods, the Beaver Archipelago fish assemblage shifted from predominantly brown bullheads Ameiurus nebulosus to predominantly smallmouth bass. Relative abundance of brown bullheads and white suckers Catostomus commersonii declined from historical to recent time periods, as did overall species richness. The relative abundance, recruitment variability, and mortality rates of smallmouth bass have not significantly changed since the historical time period, whereas both condition (ages 5-7) and growth (ages 2-7) of this species have significantly increased. Our results suggest that the smallmouth bass population in the Beaver Archipelago area has not been negatively affected by recent ecological changes (i.e., declining primary productivity, increasing benthic invertebrate densities, increasing numbers of double-crested cormorants Phalacrocorax auritus, and increasing introductions of nonnative species). The smallmouth bass is currently the dominant nearshore species and remains a critical component of the nearshore fish assemblage in northern Lake Michigan.
机译：大湖区近海地区的生态和经济重要性以及密歇根湖近岸鱼群的信息匮乏，促使我们记录了从历史时期（1969-1972年，1975年，1977年和1984年）到最近一段时间的变化（ （2005-2008年）在密歇根湖北部（海狸群岛）的鱼群中，重点是小嘴鲈鱼Micropterus dolomieu。从历史到近代，海狸群岛的鱼类种类从主要是棕色的牛头A（Ameiurus nebulosus）转移到主要是小嘴鲈鱼。棕色笨蛋和白色吮吸者的相对丰度从历史到最近时期下降，总体物种丰富度也下降了。自历史时期以来，小嘴鲈的相对丰度，募集变异性和死亡率没有显着变化，而该物种的状况（5-7岁）和生长（2-7岁）均显着增加。我们的结果表明，海狸群岛地区的小口黑鲈种群没有受到近期生态变化的负面影响（例如，初级生产力下降，底栖无脊椎动物密度增加，双冠cor的数量增加以及外来物种的引进增加）。小嘴鲈目前是近岸鱼类的主要种类，仍然是密歇根湖北部近岸鱼类种群的重要组成部分。

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