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首页> 外文学位 >Annulus deposition and intra-annular growth of three freshwater mussels in the Duck River, Tennessee.
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Annulus deposition and intra-annular growth of three freshwater mussels in the Duck River, Tennessee.

机译：田纳西州达克河的三个淡水贻贝的环空沉积和环内生长。

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摘要

It is commonly known that freshwater mussels deposit annual growth rings. Few studies have examined the timing of annulus deposition. This study provides a precise estimate of annulus formation and examines growth rates throughout a single growing season.;Collections from muskrat middens were conducted bi-weekly immediately downstream of Lillards Mill on the Duck River, Tennessee. Fresh-dead shells of three species ( Lemiox rimosus,Villosa taeniata, and Epioblasma ahlstedti) were thing-sectioned and examined to determine the age of each individual as well as to measure the marginal increment (MI), defined here as the distance between the most recent annulus and the shell margin of the thin-section. The location of the annuli was tracked among collections, with the MI expected to increase as the growing season progressed. Linear regressions of MI on Julian Date were used to determine growth rates for the 2012 growing season. The general linear model (GLM) was used to compare regressions between age classes of each species.;A total of 302, 268, and 134 individuals of L. rimosus,V. taeniata, and E. ahlstedti were collected, respectively. Analysis of the MIs indicate a period of annulus formation during late March to early April for L. rimosus and V. taeniata, while the period for E. ahlstedti was less clear due to small sample sizes. Analysis using the GLM indicated that regression slopes differed significantly among age groups in both L. rimosus and V. taeniata. Younger cohorts grew significantly faster than their older counterparts. The MI data for E. ahlstedti were not statistically analyzed due to unclear timing of annulus formation for most cohorts as well as the variation within and among collections due to small sample sizes.
机译：众所周知，淡水贻贝会沉积年轮。很少有研究检查环空沉积的时间。这项研究提供了精确的环空形成估计，并检查了整个单个生长季节的生长速率。麝香鼠中部的采集每两周一次，在田纳西州达克河的Lillards Mill下游进行。对三种物种的新鲜死壳（Lemiox rimosus，Villosa taeniata和Epioblasma ahlstedti）进行了切片，并进行了检查，以确定每个人的年龄以及测量边际增量（MI），这里将其定义为最近的环空和薄层的壳缘。在收集过程中跟踪了瓣环的位置，随着生长季节的进行，MI有望增加。使用Julian Date上MI的线性回归来确定2012年生长季节的增长率。使用通用线性模型（GLM）来比较每个物种的年龄类别之间的回归。；共有302、268和134个金线猴。分别收集了taeniata和E. ahlstedti。 MIs的分析表明，rimusus和V. taeniata在3月下旬至4月初出现了一个环空形成时期，而由于样本量小，E。ahlstedti的时期不太清楚。使用GLM进行的分析表明，在各年龄段中，rimosus和taeniata的回归斜率差异显着。年轻的同龄人的增长明显快于年长的同龄人。由于大多数人群的环空形成时间不明确，以及由于样本量小，馆内和馆内之间的差异，因此未对埃希氏大肠埃希菌的MI数据进行统计分析。

著录项

  • 作者

    Foley, Ryan P.;

  • 作者单位

    Tennessee Technological University.;

  • 授予单位 Tennessee Technological University.;
  • 学科 Biology General.;Biology Ecology.;Agriculture Fisheries and Aquaculture.
  • 学位 M.S.
  • 年度 2014
  • 页码 71 p.
  • 总页数 71
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 地下建筑;
  • 关键词

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