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首页> 外文期刊>Environmental toxicology and chemistry >FATHEAD MINNOW (PIMEPHALES PROMELAS RAFINESQUE) REPRODUCTION IN OUTDOOR MICROCOSMS: AN ASSESSMENT OF THE ECOLOGICAL EFFECTS OF FISH DENSITY
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FATHEAD MINNOW (PIMEPHALES PROMELAS RAFINESQUE) REPRODUCTION IN OUTDOOR MICROCOSMS: AN ASSESSMENT OF THE ECOLOGICAL EFFECTS OF FISH DENSITY

机译：在室外微群中的小头（小翅目无性繁殖）繁殖：鱼密度的生态效应评估

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摘要

This study was part of a research program designed to evaluate fathead minnow (Pimephales promelas) reproduction in 17-m~3 outdoor microcosms as a test system to investigate ecosystem-level impacts of toxicants. Sex ratios of fathead minnow (FHM) adults at stocking were manipulated to regulate the biomass and numbers of young-of-the-year (YOY) following reproduction. This study reports the effect of fish densities obtained from six different sex ratios on microcosm ecology that were compared to a fishless control during a 4.5-month period. Fish sampled during the study were representative of the actual population. Taxa collected from FHM stomachs were very diverse (16 groups) representing various communities and trophic levels. Bacillariophyta, filamentous algae, and macrophytes were the dominant food source; however, Crustacea, rotifers, chi-ronomids, and other macroinvertebrates were also important. Effects on community structure were investigated using multi-variate discriminant analysis. There were no fish density effects on zooplankton or benthic macroinvertebrate community structures. Microcosms with high FHM densities had fewer emerging chironomids, and phytoplankton levels were elevated. Phy-toplankton taxa, which discriminated phytoplankton community structure differences between fish biomass groups, were also positively correlated with total phosphorus.
机译：这项研究是一项研究计划的一部分，该计划旨在评估17-m〜3的室外缩影中的黑头min鱼（Pimephales promelas）繁殖，以此作为测试系统来调查有毒物质对生态系统的影响。放养时，对fat鱼now鱼（FHM）成虫的性别比进行控制，以调节生物量和年幼（YOY）的数量。这项研究报告了在4.5个月内与无鱼对照组相比，从六个不同性别比例获得的鱼密度对微观生态学的影响。研究期间取样的鱼类代表实际种群。从FHM胃中收集的分类单元非常多样化（16个组），代表了不同的群落和营养水平。芽孢杆菌，丝状藻类和大型植物是主要的食物来源。然而，甲壳纲，轮虫，鸟纲和其他大型无脊椎动物也很重要。使用多元判别分析调查对社区结构的影响。鱼密度对浮游动物或底栖大型无脊椎动物群落结构没有影响。具有高FHM密度的缩影具有较少的新出现的拟鳞虫，浮游植物水平升高。区分鱼类生物量组之间浮游植物群落结构差异的浮游植物分类群也与总磷呈正相关。

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