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Early life history dynamics and recruitment processes of rainbow smelt in Lake Huron.

机译：休伦湖彩虹熔炼的早期生活史动态和募集过程。

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摘要

Rainbow smelt are an important prey species for native and introduced salmonines in the Great Lakes, as well as being a competitor and predator of native fish species. In Lake Huron, rainbow smelt populations have been characterized by variable recruitment and year class strength. To understand growth and survival dynamics during early life history, larval rainbow smelt populations were sampled during 2008 and 2009 in St. Martin Bay, Lake Huron. Growth rates of larval rainbow smelt and relative survival of stream cohorts was higher during 2009 than in 2008, a consequence of warmer water temperatures during June and cooler, more optimal temperatures during July. Early hatching stream cohorts experienced high mortality during 2008 and fish surviving experienced lower growth relative to cohorts during 2009. To investigate long term recruitment dynamics for these populations, Ricker stock-recruit models were developed for Lake Huron rainbow smelt sampled from 1976-2009. Ricker models were developed with the inclusion of four external variables that have been reported to affect rainbow smelt production: precipitation, water temperature, water levels, and lake trout abundance as measured by catch per unit effort (CPE). The best model describing rainbow smelt recruitment during 1976-2009 included lake trout CPE, Lake Huron water levels, and over basin precipitation. A separate model for the 1994-2009 time period identified lake trout CPE as an important regulator of rainbow smelt recruitment. These findings indicate that variability in growth and survival of rainbow smelt during early life history stages influences year class formation, but recruitment is strongly regulated by lake trout predation on adults or age-0 recruits.
机译：彩虹熔炼是五大湖中本地和引进鲑鱼的重要猎物，也是本地鱼类的竞争者和捕食者。在休伦湖，彩虹熔炼种群的特征是可变的招募和年级强度。为了了解生命早期的生长和生存动态，我们在2008年和2009年期间对休伦湖圣马丁湾的幼虫虹吸种群进行了采样。由于6月水温升高和7月低温，最佳温度升高，2009年幼虫彩虹熔炼的增长率和河流种群的相对存活率高于2008年。相对于2009年，早期孵化流群的死亡率高，而鱼类存活率则相对于2009年低。为了调查这些种群的长期招募动态，针对休伦湖彩虹熔炼厂（1976-2009年）开发了Ricker种群招募模型。开发了Ricker模型，其中包括四个据报道会影响彩虹熔炼生产的外部变量：降水量，水温，水位和按每单位捕捞量（CPE）测得的鳟鱼丰度。 1976年至2009年期间描述彩虹熔炼招募的最佳模型包括鳟鱼CPE，休伦湖水位和流域上方的降水。 1994-2009年期间的一个单独模型确定了鳟鱼CPE是彩虹熔炼招募的重要调节器。这些发现表明，在生命的早期阶段，彩虹熔炼的生长和存活率的变化会影响年级的形成，但是对成年或0岁新兵的鳟鱼捕食对募集活动的影响很大。

著录项

  • 作者

    O'Brien, Timothy P.;

  • 作者单位

    Michigan State University.;

  • 授予单位 Michigan State University.;
  • 学科 Agriculture Fisheries and Aquaculture.
  • 学位 M.S.
  • 年度 2010
  • 页码 87 p.
  • 总页数 87
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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