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首页> 外文学位 >THE ECOLOGY OF THE FRESHWATER FISHES OF CENTRAL HONDURAS (NEOTROPICAL, RESERVOIRS, FOOD PARTITIONING, REPRODUCTION).
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THE ECOLOGY OF THE FRESHWATER FISHES OF CENTRAL HONDURAS (NEOTROPICAL, RESERVOIRS, FOOD PARTITIONING, REPRODUCTION).

机译：洪都拉斯中部淡水鱼类的生态（新营养，水库，食物分配，繁殖）。

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摘要

The objectives of this study were to document fish distribution in the Humuya, Sulaco and Yure drainages of central Honduras, and to investigate the trophic and reproductive ecology of the more common species. Collections were made over a two year period from 22 riverine stations, and from L. Yure, a small, recently constructed headwater impoundment.; A total of 32 species, including 4 exotics, was collected from the area. Species richness within the Yure drainage increased from 6, in a second order headwater stream, to 15, in the fourth order R. Yure near its confluence with the R. Humuya. The cichlids Cichlasoma spilurum and C. motaguense dominated the fish community of the R. Yure, both in terms of numbers and biomass. Two species of pimelodid catfishes were also important components of this assemblage, with Rhamdia quatemalensis increasing and R. cabrerae decreasing in abundance as stream size increased. The characins Astyanax fasciatus and Brycon guatemalensis were most abundant in deeper pools.; Aquatic insect larvae represented the most important food for many of the fish species, but allochthonous material and periphyton were major diet components for a few cichlid, characin and poeciliid species. Diet breadths and overlaps between species were, in general, low within the R. Yure assemblage, and the distribution of diet overlaps exhibited little seasonal variation.; Patterns of reproductive seasonality were diverse, and peak spawning within at least two congeneric species pairs in the R. Yure was staggered through time.; Five species dominated the fish community of L. Yure. During the course of the study, there was a significant increase in the abundance of largemouth bass, and the catfish characteristic of small streams, R. cabrerae, was replaced by a predominantly lowland species, R. guatemalensis. Temporal variation in the diets of these species was documented. Diets were influenced by the increase in invertebrate densities as benthic plant populations developed. Zooplankton were only utilized by fish after the modal plankter size increased following the appearance in the community of Daphnia pulex.; Reproductive seasonality and fecundity of riverine and lacustrine populations of cichlid, characin and pimelodid species were compared. There was some indication of between-population differences in the case of A. fasciatus, but not for the remaining species.
机译：这项研究的目的是记录洪都拉斯中部Humuya，Sulaco和Yure流域的鱼类分布，并调查更常见物种的营养和生殖生态。在两年的时间内，从22个河边站点以及最近建造的小型水源蓄水池L. Yure收集了水。该地区共采集了32种，其中包括4种外来物种。尤尔河流域内的物种丰富度从二阶源流的6种增加到四阶R. Yure与R. Humuya汇合处的15种，在四阶R. Yure中增加。从数量和生物量两方面来看，丽鱼科丽鱼丽鱼（Cichlasoma spilurum）和莫氏梭状芽胞杆菌（C. motaguense）都主导着尤尔河（R. Yure）的鱼类群落。沙律双体鱼的两种也是该组合的重要组成部分，随着溪流大小的增加，四角兰鼠李（Rhamdia quatemalensis）增加而黄R鼠（R. cabrerae）的数量减少。在深水库中，Charasins fasciatus和Brycon guatemalensis最丰富。对于许多鱼类而言，水生昆虫幼虫是最重要的食物，但异位材料和附生植物是一些丽鱼科鱼，甲壳素和拟杆菌属的主要饮食成分。通常，在R. Yure组合中，物种之间的饮食宽度和重叠程度较低，并且饮食重叠的分布几乎没有季节变化。生殖季节的模式是多样的，并且在R. Yure的至少两个同类物种中，产卵高峰随着时间错开。 L. Yure的鱼类群落中有五种占主导地位。在研究过程中，大嘴鲈的丰度显着增加，小河R的特征性cat鱼被低地物种危地马拉R.代替。记录了这些物种饮食的时间变化。随着底栖植物种群的发展，饮食受到无脊椎动物密度增加的影响。浮游动物仅在水蚤群落中出现浮游浮游动物大小后才被鱼类利用。比较了丽鱼科鱼，查拉欣和比美洛德物种的河岸和湖岸种群的繁殖季节和繁殖力。有迹象表明在筋膜曲霉的情况下种群之间存在差异，但其余物种则没有。

著录项

  • 作者

    VAUX, PETER DAVID.;

  • 作者单位

    University of California, Davis.;

  • 授予单位 University of California, Davis.;
  • 学科 Biology Ecology.
  • 学位 Ph.D.
  • 年度 1985
  • 页码 271 p.
  • 总页数 271
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 生态学（生物生态学）;
  • 关键词

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