Abundance, Spatiotemporal Distribution, and Growth of Bluegill and Redear Sunfish Fry in a 0.6-ha Pond
作者:
W.F. Dimond,
T.W. Storck,
期刊:
Journal of Freshwater Ecology
(Taylor Available online 1985)
卷期:
Volume 3,
issue 1
页码: 93-102
ISSN:0270-5060
年代: 1985
DOI:10.1080/02705060.1985.9665095
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
The temporal spawning distributions and certain aspects of the early life-histories of bluegill (Lepomis macrochirus) and redear sunfish (L. microlophus) were compared in a recently stocked 0.6-ha pond in central illinois. Redear sunfish spawned earlier, at lower temperatures, and for a shorter interval than did bluegill. Age-0 redear sunfish were primarily restricted to littoral habitats; in contrast, age-0 bluegill occupied both limnetic and littoral habitats, but they became increasingly restricted to littoral habitats as their size increased. First-summer growth rates of early-spawned individuals of the two species were similar, but late-spawned redear sunfish grew significantly slower than similarly-aged bluegill. However, because redear sunfish spawned earlier, in September their young were generally larger ([Xbar]TL= 39.0 mm) than bluegill young ([Xbar]TL= 25.8 mm). Age-0 bluegill were much more abundant than age-0 redear sunfish in September (57 to 1). Inconsistent reproductive success is implicated as a factor limiting recruitment in redear sunfish populations.
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