Body Condition Correlates with Instantaneous Growth in Stream-Dwelling Rainbow Trout and Arctic Grayling
Body Condition Correlates with Instantaneous Growth in Stream-Dwelling Rainbow Trout and Arctic Grayling
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DOI：
10.1080/00028487.2013.769899
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发表时间：
2013-05-01
影响因子：
1.4
通讯作者：
Schindler, Daniel E.
中科院分区：
文献类型：
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作者：
Bentley, Kale T.;Schindler, Daniel E.
了解鱼类对不同环境和生物条件的生长反应对于种群和群落的管理和保护非常重要。然而，获得生长数据的时间尺度短于提供的年度尺寸在年龄的关系是昂贵的和劳动密集型的，可以是后勤不切实际的。我们评估了身体状况指数的能力，作为一个代理个人的瞬时增长率在阿拉斯加西南部的两种主要是亚成体流居住的鲑鱼。我们发现，相对的身体状况，作为测量的残差周围的长度-质量回归，是强烈相关的个体瞬时增长的直接措施（第（-1）天）从标记重捕数据。此外，身体状况显着相关的增长积累了大约2-10周的时间在虹鳟鱼和北极灰鹤Thymallus arcticus，而这种关系通常较弱的时间段小于2周，大于1年。尽管使用身体状况指数来推断个人的生理状态的局限性，我们的研究结果表明，当明智地应用，身体状况可以被用作最近的个人瞬时增长率的替代品。接收日期：2012年6月30日;接受日期：2013年1月9日
Understanding the growth response of fish to varying environmental and biological conditions is important for the management and conservation of populations and communities. However, obtaining growth data at time scales shorter than those provided by annual size-at-age relationships is costly and labor intensive and can be logistically impractical. We assessed the ability of a body condition index to serve as a proxy for individual instantaneous growth rates in two species of mostly subadult stream-dwelling salmonids in southwestern Alaska. We found that relative body condition, as measured by the residuals around a length-mass regression, was strongly correlated with direct measures of individual instantaneous growth (day(-1)) from mark-recapture data. Further, body condition was significantly correlated with growth accumulated over a period of roughly 2-10 weeks in both Rainbow Trout Oncorhynchus mykiss and Arctic Grayling Thymallus arcticus, while the relationship was typically weaker for time periods of less than 2 weeks and greater than 1 year. Despite the limitations of using body condition indices to infer the physiological status of individuals, our results demonstrate that, when applied judiciously, body condition can be used as a surrogate for recent individual instantaneous growth rate. Received June 30, 2012; accepted January 9, 2013