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首页> 外文学位 >Distribution, Habitat Use, and Movements of Juvenile Smalltooth Sawfish, Pristis pectinata, in the Charlotte Harbor Estuarine System, Florida.
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Distribution, Habitat Use, and Movements of Juvenile Smalltooth Sawfish, Pristis pectinata, in the Charlotte Harbor Estuarine System, Florida.

机译：佛罗里达夏洛特港河口系统中幼小齿锯齿aw（Pristis pectinata）的分布，栖息地使用和活动。

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摘要

Understanding how endangered marine species rely on coastal habitats is vital for recovery planning. The smalltooth sawfish (Pristis pectinata ) is one of several critically endangered sawfishes worldwide known to use coastal habitats during their early life history. In a Florida estuary, juveniles were monitored to characterize seasonality, recruitment, and habitat use. Sawfish were captured year round. Captures of neonates allowed determination of the size at birth and the timing of parturition which peaked between April and May. Although sampling occurred throughout the estuary, five locations called hotspots had the greatest catch rates. Most juveniles had an affinity for water 1 m deep, water >30°C, dissolved oxygen concentrations >6 mg L-1, and salinities between 18 and 30 psu.;Movements of juveniles were monitored over two years using acoustic tags and an array of acoustic receivers distributed in both main-stem habitats and nonmain-stem habitats of the highly altered, flow-managed tidal Caloosahatchee River, Florida. Over three-fourths of the P. pectinata used non-main-stem habitats, and almost half used these habitats more than 10% of the time. Daily activity space of P. pectinata was 0.7 km of river distance and they remained in the nursery under a wide range of environmental conditions. Sawfish moved upriver as salinity increased. Salinity patterns had a greater effect on the distribution of 1-year-old P. pectinata than on that of older individuals.;Research on P. pectinata has shown that hotspots within the nurseries are disproportionally important during early life history. The objectives of this portion of the study were to determine whether selection of a hotspot by 10 small juveniles was maternally- or offspring-driven and document subsequent use of this and other known hotspots by these individuals. Analyses of microsatellite and mitochondrial DNA suggested the presence of four full-sibling dyads and a single half-sibling pair, along with several unrelated individuals; this implied that at least four mothers contributed to the group (selection of the hotspot was offspring-driven). On average, juveniles spent 61% of their time at one hotspot. Larger-scale movements between hotspots occurred after passage of a tropical storm and smaller-scale movements exhibited a diel pattern at two hotspots.;The official Smalltooth Sawfish Recovery Plan was published in 2009 by the National Marine Fisheries Service. Included in the recovery plan were specific research objectives that need to be met to help protect and recover the remaining P. pectinata population. This dissertation addresses all or part of at least 31 of the research objectives (i.e., Action Items) listed in the recovery plan that pertain to the juvenile life stages of P. pectinata.
机译：了解濒危海洋物种如何依赖沿海生境对于恢复计划至关重要。小齿锯鱼（Pristis pectinata）是世界范围内几种濒临灭绝的锯鱼之一，已知在其早期生活中就使用沿海生境。在佛罗里达州的河口，对未成年人进行了监测，以表征季节性，募集和栖息地的使用。 aw鱼全年被捕获。新生儿的捕获可以确定出生时的大小和分娩的时间，分娩的时间在4月至5月之间达到峰值。尽管整个河口都进行了采样，但五个热点地区的捕获率最高。大多数青少年对水<1 m深，水> 30°C，溶氧浓度> 6 mg L-1和盐度在18至30 psu之间具有亲和力;使用声学标签和一系列的声学接收器，分布在佛罗里达州高度变化，流量管理的潮汐Caloosahatchee河的主干生境和非主干生境中。超过四分之三的果胶疟原虫使用非主茎生境，近一半的人使用这些生境的时间超过10％。果蝇的日常活动空间为河面距离0.7 km，它们在各种环境条件下仍留在苗圃中。随着盐度的增加，鱼向上游移动。盐度模式对小于1岁的果蝇体育活动的分布的影响要大于年龄较大的人群。;对果蝇体育活动的研究表明，苗圃中的热点在生命的早期阶段就显得尤为重要。本部分研究的目的是确定由10个小青少年选择的热点是由母体驱动还是由后代驱动，并记录这些人随后使用该热点和其他已知热点的情况。对微卫星和线粒体DNA的分析表明存在四个全兄弟双胞胎和一个半兄弟双胞胎，以及几个无关的个体。这意味着至少有四位母亲参与了这一活动（热点的选择是由后代驱动的）。平均而言，青少年在一个热点上花费了61％的时间。在热带风暴过后热点之间发生了较大规模的运动，而在两个热点处发生了较小规模的运动呈迪尔模式。官方的《小齿aw鱼恢复计划》由国家海洋渔业局于2009年发布。恢复计划中包括特定的研究目标，需要实现这些目标以帮助保护和恢复剩余的果胶疟原虫种群。本论文解决了恢复计划中列出的至少31个研究目标（即行动项目）的全部或部分内容，这些研究目标与果胶疟原虫的幼年期有关。

著录项

  • 作者

    Poulakis, Gregg Richard.;

  • 作者单位

    Florida Institute of Technology.;

  • 授予单位 Florida Institute of Technology.;
  • 学科 Biology Ecology.;Biology Oceanography.;Biology Zoology.
  • 学位 Ph.D.
  • 年度 2012
  • 页码 165 p.
  • 总页数 165
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 农学（农艺学）;
  • 关键词

  • 入库时间 2022-08-17 11:42:43

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