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首页> 外文期刊>Lakes & Reservoirs >The responses of Nile tilapia Oreochromis niloticus (Linnaeus, 1758) in Lake Wamala (Uganda) to changing climatic conditions
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The responses of Nile tilapia Oreochromis niloticus (Linnaeus, 1758) in Lake Wamala (Uganda) to changing climatic conditions

机译：瓦马拉湖（乌干达）尼罗罗非鱼 Oreochromis niloticus （Linnaeus，1758）对气候条件变化的响应

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摘要

Changes in the catches of Nile tilapia, Oreochromis niloticus (Linnaeus, 1758), in Lake Wamala (Uganda) have been observed since its introduction. The factors contributing to these changes, however, are not well understood. This study examined changes in species composition, size structure, size at first maturity, length–weight relationship and condition factor of Nile tilapia in Lake Wamala, in relation to changes in temperature, rainfall and lake depth, to provide a better understanding of the possible role of changing climatic conditions. There was an increase in the minimum, maximum and average temperatures since 1980, but only the minimum (0.021°C year−1) and average temperatures (0.018°C year−1) exhibited a significant trend (P<0.05). Rainfall increased by 8.25mm year−1 since 1950 and accounted for 79.5% of the water input into the lake during the period 2011–2013, while evaporation accounted for 86.2% of the water loss from the lake. The lake depth was above 4m during the years when the rainfall exceeded the average of 1180mm, except after 2000. The contribution of Nile tilapia to total fish catch and catch per unit effort (CPUE) increased with rainfall and lake depth up to the year 2000, after which they decreased, despite an increased rainfall level. The lake depth was positively correlated with the average total length and length at 50% maturity (r=0.991 and 0.726, respectively), while the slopes of the length–weight relationships differed significantly between high and low lake depths [t(6)=3.225, P<0.05]. Nile tilapia shifted from an algal-dominated diet during the wet season to include more insects during the dry season. The results of this study indicate Nile tilapia in Lake Wamala displays a typical r-selected reproductive strategy, by growing to a small size, maturing faster and feeding on different food types, in order to survive high mortality rates under unfavourable conditions attributable to higher temperatures, low rainfall and low lake water levels.
机译：自引进以来，在Wamala湖（乌干达）的尼罗罗非鱼（Oreochromis niloticus（Linnaeus，1758））的捕获量已发生变化。但是，促成这些变化的因素尚不十分清楚。这项研究检查了瓦玛拉湖中尼罗罗非鱼的物种组成，大小结构，初熟时的大小，长度与重量的关系以及条件因子的变化，这些变化与温度，降雨和湖泊深度的变化有关，以便更好地了解可能发生的变化。气候条件变化的作用。自1980年以来，最低，最高和平均温度都有所增加，但只有最低（0.021°C year-1）和平均温度（0.018°C year-1）表现出显着趋势（P <0.05）。自1950年以来，-1年降雨量增加了8.25毫米，占2011-2013年间湖水输入量的79.5％，而蒸发量则占湖水损失的86.2％。除2000年以后，降雨量超过年均1180mm的年份中，湖深超过4m。除2000年外，尼罗罗非鱼对总鱼获量和单位捕捞量（CPUE）的贡献随着降雨和湖深的增加而增加。 ，此后尽管降雨量增加，但它们减少了。湖泊深度与成熟度为50％时的平均总长度和平均长度呈正相关（分别为r = 0.991和0.726），而长度与重量关系的斜率在高低湖泊深度之间存在显着差异[t（6）= 3.225，P ＜0.05]。尼罗河罗非鱼在雨季从以藻类为主的饮食转变为在旱季包括更多昆虫。这项研究的结果表明，瓦玛拉湖中的尼罗罗非鱼具有典型的r选择繁殖策略，可以长到较小的大小，更快地成熟并以不同的食物为食，以便在高温导致的不利条件下存活高死亡率，低降雨和低湖水位。

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  • 来源
    《Lakes & Reservoirs》 |2015年第2期|1-19|共19页
  • 作者

    Natugonza Vianny; Ogutu-Ohwayo Richard; Efitre Jackson; Muyodi Fredrick; Mbabazi Dismas; Olokotum Mark; Musinguzi Laban; Naigaga Shamim; Namboowa Sharon;

  • 作者单位

    National Fisheries Resources Research Institute (NaFIRRI) Jinja Uganda;

    Department of Biological Sciences Makerere University Kampala Uganda;

    National Fisheries Resources Research Institute (NaFIRRI) Jinja Uganda;

    Department of Biological Sciences Makerere University Kampala Uganda;

    Department of Biological Sciences Makerere University Kampala Uganda;

    National Fisheries Resources Research Institute (NaFIRRI) Jinja Uganda;

    Department of Biological Sciences Makerere University Kampala Uganda;

    National Fisheries Resources Research Institute (NaFIRRI) Jinja Uganda;

    National Fisheries Resources Research Institute (NaFIRRI) Jinja Uganda;

    Department of Biological Sciences Makerere University Kampala Uganda;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    catches; lake depth; Nile tilapia; rainfall; r-selection;

    机译：捕获;湖深;尼罗罗非鱼;降雨;r-选择;

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