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首页> 外文学位 >Life history and habitat use of the juvenile Alabama shad ( Alosa alabamae) in northern gulf of Mexico rivers.
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Life history and habitat use of the juvenile Alabama shad ( Alosa alabamae) in northern gulf of Mexico rivers.

机译：墨西哥河北部海湾的阿拉巴马幼鱼（Alosa alabamae）的生活史和栖息地使用情况。

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摘要

The Alabama shad, Alosa alabamae, is an anadromous species that is in decline and has seen extirpations from impoundments as well as decreased water quality. Alabama shad live in the Gulf of Mexico and ascend Northern Gulf of Mexico Drainages to reproduce early in the year (January-May). The juveniles spend the majority of the year in these freshwater systems before emigrating out to the Gulf of Mexico as late as December.;This dissertation focuses on the juvenile life stages that occur within the Northern Gulf of Mexico drainages. Spawning conditions of the river, as well as the habitat and diet, are studied and documented. Habitat use of the juvenile Alabama shad shifted from sand bars to open channel and banks which was seen in progression as the juveniles increased in size and maturity. Important physicochemical parameters that influenced the presence of Alabama shad within these habitats ranged from temperature, flow velocity, and conductivity. Diet of the juvenile Alabama shad consisted of particulate detritus within Alabama shad <50mm and a host of terrestrial and aquatic insects as the Alabama shad matured. Hatch timing was documented between the drainages sampled from early January through March. Spring flows followed a falling trend with increasing temperatures.;These findings suggest that the management of these drainages should be done independently on a drainage-by-drainage basis. Habitats are consistent between drainages, but the physicochemical factors driving the presence of this species are unique to each drainage. It is also suggested that maintaining natural flows for habitat maintenance and reproductive cues is important toward conservation of the species.
机译：阿拉巴马州的Al鱼（Alosa alabamae）是一种正浮游的物种，其数量正在下降，并且由于蓄水而灭绝并且水质下降。阿拉巴马州的d鱼生活在墨西哥湾，在墨西哥湾北部的排水渠在今年初（1-5月）繁殖。少年在这些淡水系统中度过了一年的大部分时间，直到12月下旬才移居到墨西哥湾。本论文重点研究了墨西哥北部海湾排水系统中的少年生命阶段。研究并记录了河流的产卵条件以及栖息地和饮食。幼年阿拉巴马州d鱼的栖息地使用从沙洲转移到明渠和河岸，随着少年的体型和成熟度的增加，这种生活逐渐发展。影响这些生境中阿拉巴马树荫存在的重要理化参数包括温度，流速和电导率。幼年阿拉巴马州sha鱼的饮食包括阿拉巴马州sha鱼<50mm内的颗粒碎屑以及随着阿拉巴马州sha鱼的成熟而产生的许多陆生和水生昆虫。记录下从1月初到3月的排水沟之间的孵化时间。春季流量随温度升高而呈下降趋势。;这些发现表明，这些排水的管理应在逐排水的基础上独立进行。排水沟之间的生境是一致的，但是驱动该物种存在的物理化学因素对于每种排水沟都是独特的。还建议维持自然流量以维持栖息地和生殖线索对保护物种很重要。

著录项

  • 作者

    Mickle, Paul Fraser.;

  • 作者单位

    The University of Southern Mississippi.;

  • 授予单位 The University of Southern Mississippi.;
  • 学科 Biology Ecology.
  • 学位 Ph.D.
  • 年度 2010
  • 页码 102 p.
  • 总页数 102
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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