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首页> 外文学位 >Studies of feeding behavior, development, and food limitation in first feeding nauplii of the copepod Acartia tonsa (Copepoda: Calanoida).
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Studies of feeding behavior, development, and food limitation in first feeding nauplii of the copepod Acartia tonsa (Copepoda: Calanoida).

机译：研究pe足类A螨（Apetiatonsa）（Copepoda：Calanoida）首次进食无节幼体的进食行为，发育和食物限制。

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摘要

Food limitation of production by naupliar stages of marine copepods is poorly understood. This dissertation focuses on aspects of food requirements and the question of food limitation of first feeding nauplii of the copepod Acartia tonsa.; Laboratory studies were conducted to investigate naupliar feeding behavior. Small flagellates and dinoflagellates less than about 15 {dollar}mu{dollar}m in size were found to be the best food source, while diatoms and chlorophytes were a poor food source. High concentrations of the dinoflagellate Heterocapsa pygmaea (540 {dollar}mu{dollar}gC/1, 80 {dollar}mu{dollar}gN/1) were required for maximum development rates. High ingestion rates (mean 1110% body C/day) were found, but no pattern between total ingestion in terms of C or N and cell size or phytoplankton type was observed. Respiration rates of feeding nauplii were 4 times greater than starved animals in filtered seawater. High naupliar metabolic rates when feeding on food of poor nutritional quality may accelerate starvation.; Morphometric analysis was used to assess the condition of individual nauplii (N3) of the copepod Acartia tonsa that were either reared in the laboratory or collected from a 13 m{dollar}sp3{dollar} mesocosm. Nauplii grown on a mixed phytoplankton diet were larger than those grown on Dunaliella tertiolecta, a poor food source. Measurements of shape were not significantly different. A laboratory derived discriminant function based on morphometric measurements was used to assess the condition of nauplii collected from the mesocosm. The discriminant function correctly classified nauplii in poor condition during periods of high mortality and slow development, and was also successful at identifying nauplii in good condition when mortality was low and nauplii were developing at near maximal rates.; A comparison of the effects of food limitation between Acartia tonsa adult females and first feeding nauplii was conducted during the summer and fall of 1988 in lower Narragansett Bay. Measurements of growth and egg production of adult females in ambient bay water and algae enriched bay water indicated that the animals were continuously food limited. Morphometric measurements of nauplii collected from the field and development rates of nauplii in laboratory experiments indicated that the nauplii were also food limited.
机译：人们对海洋co足类的无节幼体阶段的食物生产限制知之甚少。本文主要研究food足纲A螨的首次摄食无节幼体的食物需求和食物限制问题。进行了实验室研究以调查无节幼体的喂养行为。发现小于15 {μm}美元的小鞭毛和鞭毛藻是最好的食物来源，而硅藻和绿藻类则是较差的食物来源。为了最大的生长速率，需要高浓度的鞭毛的鞭毛杂鞭毛（540μggC / 1，80μggN / 1）。发现高摄入率（平均每天C为1110％），但在总摄入C或N与细胞大小或浮游植物类型之间未观察到模式。喂食无节幼体的呼吸速率是在过滤的海水中饥饿的动物的4倍。以营养质量差的食物为食时，幼虫的新陈代谢率较高，可能会加速饥饿。形态计量学分析被用来评估在实验室饲养或从13 m {dol} sp3 {dollar}中观收集的either足纲A足虫的个体无节幼体（N3）的状况。用浮游植物混合饮食喂养的鹦鹉螺比用食物来源贫乏的杜氏盐藻（Dunaliella tertiolecta）饲养的鹦鹉大。形状的测量没有显着差异。基于形态测量的实验室衍生的判别函数用于评估从中膜收集的无节幼体的状况。判别函数在死亡率高和发育缓慢的时期对不良条件下的无节幼体进行了正确分类，并且当死亡率低且无节幼体以接近最大的速度发展时，也成功地鉴定了状况良好的无节幼体。 1988年夏季和秋季，在纳拉甘西特湾下游，比较了car螨成年雌性和第一次喂食无节幼体对食物限制的影响。对成年雌性在环境海湾水和富含藻类的海湾水中的生长和产蛋量的测量表明，这些动物一直缺乏食物。从田间采集的无节幼体的形态测量值和实验室实验中无节幼体的发生率表明，该无节幼体也是受食物限制的。

著录项

  • 作者

    Campbell, Robert George.;

  • 作者单位

    University of Rhode Island.;

  • 授予单位 University of Rhode Island.;
  • 学科 Biology Oceanography.
  • 学位 Ph.D.
  • 年度 1993
  • 页码 353 p.
  • 总页数 353
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 海洋生物;
  • 关键词

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