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首页> 外文学位 >Effects of a drip-delivery fluridone treatment on largemouth bass Micropterus salmoides activity patterns and populations characteristics in the Spring Creek embayment of Lake Seminole, Georgia.
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Effects of a drip-delivery fluridone treatment on largemouth bass Micropterus salmoides activity patterns and populations characteristics in the Spring Creek embayment of Lake Seminole, Georgia.

机译：佐治亚州塞米诺尔湖春溪小径上滴灌氟啶酮处理对大口黑鲈Micropterus salmoides活性模式和种群特征的影响。

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摘要

Submersed aquatic vegetation (SAV) is a powerful structuring influence on fish populations, providing both a source of food and refuge from predation. Although dense SAV can benefit insectivorous fishes by increasing their food supply, dense SAV communities can be detrimental to piscivorous fishes by restricting their food supply through a reduction in predation efficiency, leading to reduced growth, condition, and fecundity. A drip-delivery herbicide (fluridone) system was initiated in May 2000 to reduce the high density of the exotic submersed macrophyte hydrilla Hydrilla verticillata in Spring Creek, a 2,343-ha embayment of Lake Seminole, Georgia, that has a history of excessive aquatic vegetation. Fluridone was applied throughout the growing season from 2000--2003 and a total of 1,800 ha of hydrilla was eliminated. To address potential fishery concerns, the effects of the hydrilla reduction on largemouth bass Micropterus salmoides activity patterns and population characteristics were examined over a 3-year period. Two groups of largemouth bass (total of 35) were implanted with radio tags and tracked once per month from May 2000 until December 2001 to document the effects of the fluridone treatment and hydrilla reduction on behavior and movement of the fish.; Food habits were quantified about every 3 months from August 2000--March 2003 to assess diet composition and feeding characteristics throughout the study. On each sampling date, about 200 largemouth bass were collected from the Spring Creek arm. Fish under 281 mm were placed in a 300 mg/L solution of MS-222 until expired, then placed on ice and stomachs were excised from these fish in the lab. Food items were removed from larger fish using clear acrylic tubes and the fish were released. An additional 200 largemouth bass were collected on each sampling date from the Chattahoochee River arm, where no hydrilla reduction has occurred, to serve as a control. Diets were quantified using the Relative Importance Index for five size groups of largemouth bass (substock, stock, quality, preferred, and memorable) in each arm. Diet overlap was compared among size groups and seasons and between periods of high and low SAV density for each arm. Food consumption of largemouth bass was simulated using the Wisconsin bioenergentics model in both arms, consumption was simulated before and after hydrilla reduction in the Spring Creek arm. (Abstract shortened by UMI.)
机译：水下水生植被（SAV）对鱼类种群具有强大的结构影响，既提供了食物来源，又提供了捕食的避难所。尽管稠密的SAV可以通过增加食源性鱼类而使食虫鱼受益，但稠密的SAV群落可以通过降低捕食效率来限制食源性，从而不利于食鱼，从而导致生长，状况和繁殖力降低。 2000年5月启动了滴灌除草剂（氟啶酮）系统，以减少佐治亚州塞米诺尔湖有2343公顷掩盖的斯普林克里克外来浸没的大型水生植物Hydrilla verticillata的高密度，该地区有过量的水生植物。从2000--2003年的整个生长季节都使用氟啶酮，总共消除了1800公顷的菌丝。为了解决潜在的渔业问题，在3年的时间内检查了减少水对大嘴鲈鱼的活动模式和种群特征的影响。从2000年5月至2001年12月，每月对两组大嘴鲈鱼（共35只）植入无线电标签，并每月进行一次跟踪，以记录氟啶酮处理和减少水肿对鱼的行为和运动的影响。从2000年8月至2003年3月，大约每3个月对饮食习惯进行量化，以评估整个研究期间的饮食组成和喂养特征。在每个采样日期，从Spring Creek手臂收集了大约200个大口黑鲈。将281 mm以下的鱼置于300 mg / L的MS-222溶液中直至失效，然后置于冰上，并在实验室中从这些鱼中切除胃。使用透明的丙烯酸管从较大的鱼中取出食品，然后将鱼放出。在每个采样日期，从Chattahoochee河支流中收集了另外200个大嘴鲈，作为对照，未发生水hydr减少。使用相对重要性指数对每只手臂的五个大小组的大嘴鲈鱼（子种群，种群，质量，偏好和难忘）进行定量饮食。比较大小组和季节之间以及每只手臂SAV密度高低期之间的饮食重叠。使用威斯康星州生物能模型在两个臂上模拟了大口黑鲈的食物消耗，在Spring Creek臂上减少水肿之前和之后模拟了食物的消耗。 （摘要由UMI缩短。）

著录项

  • 作者

    Sammons, Steven Michael.;

  • 作者单位

    Auburn University.;

  • 授予单位 Auburn University.;
  • 学科 Agriculture Fisheries and Aquaculture.
  • 学位 Ph.D.
  • 年度 2004
  • 页码 139 p.
  • 总页数 139
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 水产、渔业;
  • 关键词

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