• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文学位 >Insectivore to frugivore: Ontogenetic changes in gut morphology and digestive enzyme activity in the characid fish Brycon guatemalensis from Costa Rican rain forest streams.
【24h】

Insectivore to frugivore: Ontogenetic changes in gut morphology and digestive enzyme activity in the characid fish Brycon guatemalensis from Costa Rican rain forest streams.

机译：食虫动物食虫：哥斯达黎加雨林溪流中的酸性鱼类Brycon guatemalensis肠道形态和消化酶活性的个体发育变化。

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Brycon guatemalensis Regan, a Neotropical characid fish, consumes an entirely terrestrial diet, shifting from eating insects as juveniles to fruits and leaves as adults. I studied juvenile (42–78 mm standard length, LS) and adult (225–414 mm LS) size classes collected in the Rio Puerto Viejo at the La Selva Biological Station in Costa Rica to test the hypotheses that with ontogeny (1) relative gut length increases, (2) pyloric caeca arrangement remains unchanged, and (3) pepsin, trypsin, and lipase activities decrease, while α-amylase activity increases. The hypotheses were largely supported in that adult fish had longer guts, unchanged pyloric caeca arrangement, and, at both the environmental and standard temperatures for the enzyme assays, lower pepsin and trypsin activities but higher α-amylase and lipase activities than the juveniles. These results support the view that B. guatemalensis is specialized morphologically and biochemically to function first as a carnivore and then as an herbivore during its life history.
机译：新热带嗜酸性鱼，危地马拉Bitalcon Regan完全食用陆地食物，从成年后食用昆虫变成了幼虫，变成了果实和叶子。我研究了在La Selva的Rio Puerto Viejo收集的少年（42–78毫米标准长度，L S ）和成年（225–414毫米L S ）大小类别哥斯达黎加生物站测试以下假设：随着个体发生，（1）相对肠道长度增加，（2）幽门盲肠排列保持不变，（3）胃蛋白酶，胰蛋白酶和脂肪酶活性降低，而α-淀粉酶活性增加。该假说在很大程度上得到了支持，因为成年鱼的肠胆更长，幽门盲肠排列不变，并且在酶测定的环境温度和标准温度下，胃蛋白酶和胰蛋白酶的活性均低于幼鱼，而胃蛋白酶和胰蛋白酶的活性较低。这些结果支持 B的观点。危地马拉在形态和生化上是专门的，在其生活史中首先作为食肉动物，然后作为草食动物。

著录项

  • 作者

    Drewe, Karen Elizabeth.;

  • 作者单位

    California State University, Fullerton.;

  • 授予单位 California State University, Fullerton.;
  • 学科 Biology Animal Physiology.
  • 学位 M.S.
  • 年度 2003
  • 页码 27 p.
  • 总页数 27
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 生理学;
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号