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首页> 外文期刊>Ecological Applications >Long-term changes in a reservoir fish assemblage: Stability in an unpredictable environment
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Long-term changes in a reservoir fish assemblage: Stability in an unpredictable environment

机译：水库鱼类组合的长期变化：在不可预测的环境中的稳定性

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Long-term monitoring of reservoir fish assemblages can provide insight into the development, community structure, and stability of economically important fisheries. A sentinel-site approach was used to assess changes in the offshore fish assemblage of a 36 000-ha impoundment (Lake Texoma) across 43 years. Fishes were sampled intensively year-round using gill nets in 1954, 1981-1984, and 1996-1997. Assemblage structure, overall, was relatively stable across years as indicated by persistence of species, significant concordance in rank abundance, relatively low cv of species abundances among years, and overlapping sample scores in multivariate space. However, some individual species varied in abundance across decades. Stepwise discriminant analysis revealed six species that could be used to discriminate collections among decades. A more detailed evaluation of changes in the fish assemblage between the 1980s and the 1990s that included size-structure and species associations showed little variation between decades. However, two species, small-mouth buffalo (Ictiobus bubalus) <400 mm in length and striped bass (Morone saxatilis) <250 mm in length were in greater abundance in the 1990s. Based on this and previous studies, the fish assemblage in Lake Texoma appears to be relatively stable. There is evidence to suggest: that populations of introduced species are more susceptible to abiotic disturbances than are native riverine fishes. [References: 83]
机译：对水库鱼群的长期监测可以提供对重要经济渔业的发展，群落结构和稳定性的了解。使用哨兵现场方法评估了43年间36 000公顷水库（特克索湖）的近海鱼类组合的变化。 1954年，1981-1984年和1996-1997年使用刺网对鱼类全年进行密集采样。总体而言，集合结构在多年间相对稳定，这表现为物种的持久性，等级丰度的显着一致性，年份之间物种丰度的相对CV较低以及多元空间中的样本得分重叠。然而，几十年来，一些个体物种的丰度变化很大。逐步判别分析揭示了六个物种，可用于在几十年间区分集合。对1980年代和1990年代之间鱼群变化的更详细评估，包括大小结构和物种关联，显示几十年来变化不大。然而，在1990年代，长度小于400毫米的小口水牛（Ictiobus bubalus）和长度小于250毫米的条带鲈（Morone saxatilis）的种类较多。根据这项研究和先前的研究，德克索马湖的鱼群似乎相对稳定。有证据表明：与本地河鱼类相比，引进物种的种群更容易受到非生物干扰。 [参考：83]

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