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Capelin (Mallotus villosus) fecundity in post-1990s coastal Newfoundland

机译:1990年代后沿海纽芬兰的毛鳞鱼(Mallotus villosus)繁殖力

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摘要

In the 1990s, a cold water event was associated with drastic changes in the biology of Newfoundland capelin {Mallotus villosus), the key forage fish in the north Atlantic. In contrast to studies conducted prior to the 1990s, we report a lower maximum potential fecundity (7,616-42,880) and a weak relationship between fecundity and body size based on fecundity of 218 female capelin (12.3-16.9 cm) collected within two coastal regions of Newfoundland in 2008 and 2009. Further, using forward stepwise multiple regression and hierarchical partitioning, we conclude that life history traits (mass, somatic mass and egg size) and condition indices (Fulton's K, Hepatosomatic Index and Gonadosomatic Index) are not appropriate proxies for fecundity of capelin in our study area. Hierarchical partitioning revealed that egg size and condition indices suppress the variance in fecundity explained by other factors. Based on the insight it provides into the influence of traits on fecundity, we suggest that hierarchical partitioning is a powerful analysis technique that could be used in further investigations.
机译:在1990年代,冷水事件与纽芬兰毛鳞鱼(Mallotus villosus)的生物学急剧变化有关,该毛鳞鱼是北大西洋的主要觅食鱼。与1990年代之前进行的研究相比,我们报告的最大潜在生育力(7,616-42,880)较低,并且根据在两个沿海地区采集的218只女性毛鳞鱼的生育力,生育力与体重之间的关系较弱(12.3-16.9厘米)。纽芬兰在2008年和2009年。此外,使用正向逐步多元回归和层次划分,我们得出结论,生活史特征(质量,体质量和卵大小)和状况指数(富尔顿K,肝体指数和性躯体指数)不适合用于研究区域中毛鳞鱼的繁殖力。分层划分显示,卵的大小和状况指数抑制了其他因素造成的繁殖力差异。基于它提供的特征对繁殖力影响的见解,我们建议层次划分是一种强大的分析技术,可用于进一步的研究中。

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  • 来源
    《Marine biology》 |2013年第7期|1625-1632|共8页
  • 作者单位

    Department of Biological Sciences, University of Manitoba,Winnipeg, MB R3T 2N2, Canada;

    Department of Biological Sciences, University of Manitoba,Winnipeg, MB R3T 2N2, Canada;

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