Effect of Discharge on Hatching and Growth of Age-0 Black Bass in Two Southeastern U.S. Rivers

IF 0.9 4区 环境科学与生态学 Q4 BIODIVERSITY CONSERVATION Journal of Fish and Wildlife Management Pub Date : 2021-07-19 DOI:10.3996/jfwm-21-021
S. Sammons, L. Earley, M. Goclowski
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Abstract

We examined the influence of variable discharge on hatching and age-0 growth for fluvial specialist and habitat generalist species of black bass Micropterus spp. in two southeastern U.S. rivers, the Flint River, Georgia (unregulated), and the Tallapoosa River, Alabama (regulated by several hydropower dams). Between 2008 and 2010, we collected 285 Largemouth Bass M. salmoides (generalist) and 254 Shoal Bass M. cataractae (specialist) from two reaches of the Flint River. In 2010–2011, we collected 309 Alabama Bass M. henshalli (generalist) and 216 Redeye Bass M. coosae (specialist) from two regulated reaches and one unregulated reach of the Tallapoosa River. Successful hatching of black bass in both rivers generally occurred from late March to early June when water levels were low and stable. Hatching distributions of all black bass were generally unimodal with little evidence of spawning disruption, except for Alabama Bass in the most-regulated reach of the Tallapoosa River, which appeared to be disrupted by large discharge events. Mean growth of both species in the Flint River varied from 0.64 to 0.82 mm/d across reaches and years; Shoal Bass generally grew faster than Largemouth Bass in all reach–year combinations. Largemouth Bass growth was inversely correlated to discharge variation in one reach, but Shoal Bass growth was not correlated to discharge variation in either reach. Alabama Bass and Redeye Bass growth rates in the Tallapoosa River were similar to rates observed for congeners in the Flint River; Alabama Bass grew faster than Redeye Bass. Growth of both species was inversely related to discharge variation in five of six reach–species combinations; the only exception was for Redeye Bass in the less-regulated reach. Results from this study suggest that variable discharge has less influence on successful reproduction of black bass than was reported for other fishes, but growth may be more affected by discharges resulting from anthropogenic sources than those associated with the natural regime.
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流量对美国东南部两条河流中Age-0黑鲈鱼孵化和生长的影响
我们在美国东南部的两条河流,佐治亚州的弗林特河(不受监管)和阿拉巴马州的塔拉波萨河(受几座水电站大坝监管),研究了可变流量对黑鲈鱼河流专家和栖息地多面手物种的孵化和0岁生长的影响。在2008年至2010年间,我们从弗林特河的两个河段采集了285只Largemouth Bass M.salmoides(多面手)和254只Shoal Bass M.catropeae(专家)。在2010-2011年,我们从塔拉波萨河的两个管制河段和一个未管制河段收集了309只阿拉巴马巴斯M.henshalli(多面手)和216只Redeye Bass M.coosae(专家)。在这两条河流中,黑鲈鱼的成功孵化通常发生在3月下旬至6月初,当时水位较低且稳定。除塔拉波萨河最受管制河段的阿拉巴马鲈鱼外,所有黑鲈鱼的孵化分布通常是单峰的,几乎没有产卵中断的证据,该河段似乎受到了大流量事件的干扰。弗林特河中这两种物种的平均生长量在不同河段和年份的变化范围为0.64至0.82 mm/d;在所有年份组合中,浅滩鲈鱼的生长速度通常比Largemouth鲈鱼快。在一个河段,Largemouth Bass的生长与流量变化呈负相关,但Shoal Bass的增长与两个河段的流量变化均不相关。塔拉波萨河的Alabama Bass和Redeye Bass的生长率与弗林特河同类的生长率相似;阿拉巴马巴斯的成长速度比雷迪巴斯快。在六个河段-物种组合中,有五个河段和物种的生长与流量变化呈负相关;唯一的例外是Redeye Bass在不太受监管的范围内。这项研究的结果表明,与其他鱼类相比,可变排放量对黑鲈鱼成功繁殖的影响较小,但与自然状况相关的排放量相比,人为来源的排放量对生长的影响可能更大。
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来源期刊
Journal of Fish and Wildlife Management
Journal of Fish and Wildlife Management BIODIVERSITY CONSERVATION-ECOLOGY
CiteScore
1.60
自引率
0.00%
发文量
43
审稿时长
>12 weeks
期刊介绍: Journal of Fish and Wildlife Management encourages submission of original, high quality, English-language scientific papers on the practical application and integration of science to conservation and management of native North American fish, wildlife, plants and their habitats in the following categories: Articles, Notes, Surveys and Issues and Perspectives. Papers that do not relate directly to native North American fish, wildlife plants or their habitats may be considered if they highlight species that are closely related to, or conservation issues that are germane to, those in North America.
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