Effects of seasonality and migratory prey on body condition of Cichla species in a tropical floodplain river
Effects of seasonality and migratory prey on body condition of Cichla species in a tropical floodplain river
复制标题
季节性和迁徙猎物对热带河漫滩慈鲷身体状况的影响
DOI：
--
复制
发表时间：
2006
期刊：
影响因子：
--
通讯作者：
D. B. Jepsen
中科院分区：
文献类型：
--
作者：
D. Hoeinghaus;K. Winemiller;C. Layman;D. Arrington;D. B. Jepsen
摘要：在这项研究中，我们研究了三种原产于委内瑞拉奇纳鲁科河的奇奇拉物种的身体状况趋势。具体而言，我们通过比较不同物种、水文季节和不同大小类别（基于假设间隙限制的消耗S. kneri的能力）的情况，表征了迁徙的Semaprochilodus kneri对慈蝇的潜在补贴。在上水期（繁殖期之后），三种鱼的身体状况最低。落水期只有天赤虱的身体状况比枯水期好。在落水季节，天冬螺>300 mm SL的生长条件显著高于较小的同株。每年在落水季节迁入河流的克氏弧菌为大型天绒弧菌提供了资源补贴。在主要的新热带河流流域，洄游鱼类将白水生产转移到营养匮乏的河流中似乎是一种普遍现象，这可能部分解释了这些非生产性生态系统中大型鱼类的高存储量。
Abstract – In this study we examine trends in body condition of three Cichla species native to the Cinaruco River, Venezuela. Specifically, we characterise the potential subsidy provided by migratory Semaprochilodus kneri to Cichla by comparing condition among species, hydrologic seasons and different size-classes (based on the ability to consume S. kneri assuming gape-limitation). All three species had lowest body condition during the rising-water season (following the reproduction period). Only Cichla temensis had greater body condition during the falling-water season than low-water season. During the falling-water season, C. temensis >300 mm SL had significantly greater condition than smaller conspecifics. Annual migration of S. kneri into the river during the falling-water season provides a resource subsidy to large C. temensis. Transfer of whitewater production into nutrient-poor rivers by migratory fishes appears to be a general phenomenon in the major Neotropical river basins and may partially account for high standing stocks of large piscivores in these unproductive ecosystems.