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Spatial variation in bluegill population demographics in a highly modified large river system
Journal of Freshwater Ecology ( IF 1.3 ) Pub Date : 2020-01-01 , DOI: 10.1080/02705060.2020.1806122
Andrya L. Whitten 1 , Jason A. DeBoer 1 , Levi E. Solomon 1 , Andrea K. Fritts 2 , Mark W. Fritts 3 , Richard M. Pendleton 4 , T. D. VanMiddlesworth 5 , Andrew F. Casper 1
Affiliation  

Abstract Population demographics are used by biologists and managers to determine the quality of a fishery and set regulations to achieve desired management goals. Regulating a large river system fishery that spans a substantial geographical region is often complicated by spatially variable environmental factors that affect fish population dynamics (e.g. habitat, water quality); these dynamics are rarely examined within an entire system. In this study we compared spatial differences in population age and length at capture, growth, fecundity and body condition of bluegill Lepomis macrochirus among two different river reaches (e.g. basin width, gradient, velocity) of the Illinois River (Illinois, USA) and a disconnected floodplain lake, the Emiquon Preserve. Variations in selected population demographics were evaluated in relation to well-documented habitat characteristics (e.g. water quality, aquatic vegetation, backwater availability). Differences in bluegill demographic traits between the disconnected floodplain lake and river reaches were distinct, and variations between river reaches were sex specific. The floodplain lake generally had older bluegill that expressed a higher maximum length at age and a lower growth rate and fecundity than bluegill in river reaches. River bluegill differed between river reaches in male growth, and fecundity in both sexes. Body condition was not significantly different among bluegill populations. Early research on floodplain lakes indicates that this habitat supports greater fish growth and higher reproductive fitness than mainstem habitat. We conclude that increasing the availability of quality backwater habitat, even within a highly modified large river system like the Illinois River, could substantially increase the quality and stability of bluegill populations.

中文翻译:

高度改造的大型河流系统中蓝鳃鱼种群人口统计的空间变化

摘要 生物学家和管理人员使用人口统计数据来确定渔业质量并制定法规以实现预期的管理目标。对跨越大量地理区域的大型河流系统渔业的监管往往因影响鱼类种群动态(例如栖息地、水质)的空间可变环境因素而变得复杂;很少在整个系统中检查这些动态。在这项研究中,我们比较了伊利诺伊河(美国伊利诺伊州)的两个不同河段(例如流域宽度、坡度、流速)和蓝鳃鱼在捕获、生长、繁殖力和身体状况方面的种群年龄和长度的空间差异。不连贯的泛滥平原湖,Emiquon 保护区。选定的人口统计数据的变化与有据可查的栖息地特征(例如水质、水生植被、回水可用性)有关。不连贯的泛滥平原湖泊和河流河段之间蓝鳃鱼人口学特征的差异是明显的,河流河段之间的差异具有性别特异性。泛滥平原湖一般有较老的蓝鳃鱼,其年龄最大长度比河段的蓝鳃鱼表现出更高的生长速度和繁殖力。河蓝鳃鱼在雄性生长和两性繁殖力方面在河段之间存在差异。蓝鳃鱼种群的身体状况没有显着差异。对泛滥平原湖泊的早期研究表明,该栖息地比主干栖息地支持更大的鱼类生长和更高的繁殖适应性。
更新日期:2020-01-01
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