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Application of Mark-Recapture Data to Determine Sustainability: Case Studies on Two Paddlefish Populations in Missouri

机译：标记夺回数据在确定可持续性中的应用：以密苏里州的两个Pad鱼种群为例

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摘要

The American Paddlefish Polyodon spathula is an ancient species native to the Mississippi River and its larger tributaries. This species exhibits a unique combination of morphology and life history characteristics that sets it apart from most fishes swimming in our freshwater systems. It is these traits, coupled with extensive river modifications and overexploitation, which have led to population declines from historic values. Concern over exploitation rates from sport and commercial fisheries has increased in recent decades and the Convention on International Trade of Endangered Species is now seeking information from state agencies regarding the sustainability of commercially harvested Paddlefish populations. The Missouri Department of Conservation is addressing this through the implementation of a five year study on exploitation of Paddlefish in the Mississippi River. The first two years of this project found that exploitation of Paddlefish along Missouri's eastern border was equal to 4.01% (SE=0.02). Previous spawning potential ratio modeling completed by Hupfeld et al. (In Press) used estimates of exploitation derived from un-validated ages. By replacing the information from that study with the more accurate estimates determined in this study it becomes apparent that Paddlefish populations of the Mississippi River are currently at sustainable levels. However, precautionary adjustment of regulations is advised to protect Paddlefish through maturation and to counteract the possibility of increased harvest intensity resulting from increased demand of domestic caviar.;Historically, management of fish populations has been achieved through the use of agederived estimates of growth and mortality. For long-lived species such as the Paddlefish validation of calcified structures is necessary to correct for presence of false annuli or absence of growth rings. Regardless, numerous studies on Paddlefish populations throughout their range have continued the use of un-validated age estimates to evaluate dynamic rate functions. The use of mark-recapture studies has been applied widely to evaluate growth of short-lived fishes and only recently on a few long-lived freshwater fishes (i.e., White Sturgeon, Shovelnose Sturgeon, and Pallid Sturgeon). This study provides the first simultaneous evaluation of both markrecapture and age-estimate information in determining population characteristics for Paddlefish. In doing so, this study has determined that the population of Paddlefish in the Black River below Clearwater Dam, Missouri is sustainable. Additionally, mark-recapture information is sufficient to produce accurate and reliable assessments of Paddlefish populations in lieu of validated aging structures. Future management of Paddlefish populations should be centered on accurate scientific methods; which is not the case when using un-validated aging structures (e.g., scales, otoliths, fin rays, dentary bones) to determine population parameters. Mark-recapture information can provide an accurate alternative source of growth and mortality information to be used in evaluating and managing Paddlefish populations throughout their range.
机译：美国Pad鱼（Podleodon spathula）是一种古老的物种，原产于密西西比河及其较大的支流。该物种展现出形态学和生活史特征的独特结合，使其与大多数在淡水系统中游泳的鱼类区分开来。正是这些特征，加上大量的河流改造和过度开发，导致人口从历史价值下降。近几十年来，人们对体育和商业性渔业利用率的担忧日益增加，《濒危物种国际贸易公约》目前正在向国家机构寻求有关商业捕捞的桨叶鱼类种群可持续性的信息。密苏里州自然保护部门正在通过一项为期五年的密西西比河河中的Pad鱼开发研究来解决这一问题。该项目的前两年发现，沿密苏里州东部边界的Pad鱼的开采量为4.01％（SE = 0.02）。 Hupfeld等人完成了以前的产卵势比建模。 （印刷中）使用了来自未经验证年龄的剥削估计。通过用该研究中确定的更准确的估计值代替该研究中的信息，很明显密西西比河的Pad鱼种群目前处于可持续水平。但是，建议对法规进行预防性调整，以保护Pad鱼成熟，并应对因国内鱼子酱需求增加而导致捕捞强度增加的可能性。从历史上看，通过使用老化的生长和死亡率估计值来实现对鱼类种群的管理。对于诸如the鱼这样的长寿命物种，必须对钙化结构进行验证，以纠正假环或生长环的存在。无论如何，对整个范围内的Pad鱼种群的许多研究都继续使用未经验证的年龄估计来评估动态速率函数。标记捕获研究的应用已广泛用于评估短寿命鱼类的生长，并且仅在最近才对一些长寿命淡水鱼类（即白St鱼，长鼻St鱼和帕利德St鱼）进行评估。这项研究提供了同时捕获标记和年龄估计信息的第一个同时评估方法，用于确定Pad鱼的种群特征。通过这样做，这项研究已确定密苏里州克利尔沃特水坝下方的黑河中的河豚种群是可持续的。此外，捕获标记的信息足以代替对已验证的衰老结构的评估，对Pad鱼种群进行准确而可靠的评估。 dle鱼种群的未来管理应以准确的科学方法为中心；当使用未经验证的老化结构（例如鳞片，耳石，鳍射线，齿骨）来确定种群参数时，情况并非如此。标记捕获信息可以为生长和死亡率信息提供准确的替代来源，以用于评估和管理整个范围内的Pad鱼种群。

著录项

  • 作者

    Kramer, Nicholas W.;

  • 作者单位

    Southeast Missouri State University.;

  • 授予单位 Southeast Missouri State University.;
  • 学科 Natural resource management.
  • 学位 M.S.
  • 年度 2016
  • 页码 47 p.
  • 总页数 47
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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