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首页> 外文期刊>Aquatic Sciences >Quality and contribution of food sources to Australian lungfish evaluated using fatty acids and stable isotopes
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Quality and contribution of food sources to Australian lungfish evaluated using fatty acids and stable isotopes

机译：使用脂肪酸和稳定同位素评估了澳大利亚肺鱼的食物来源质量和贡献

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摘要

The Australian lungfish, Neoceratodus forsteri Krefft, 1870, is a threatened species whose long-term persistence is at risk due to land-use intensification, water resource development, and other human pressures. Changes to the hydrology of rivers has the potential to alter the availability of certain high-quality food resources for this species, that may impact recruitment success, and contribute to population declines. This study analysed the fatty acid (FA) composition of lungfish eggs and fin tissues from two locations upstream and downstream of a large dam in the Brisbane River. We tested the hypothesis that river impoundment and flow alteration associated with the dam have altered the dietary composition and the FA composition of important dietary items for N. forsteri which translates to the body tissues and eggs. The contribution of each food source was estimated with mixing models using carbon and nitrogen stable isotopes. The total FA content in lungfish fin and eggs was significantly higher in downstream sites compared to upstream. Few significant differences in FA contents of the nine potential lungfish food sources were found between sites upstream and downstream of the dam. Stable isotope analyses of lungfish fin tissues revealed the most likely food sources were gastropods, bivalves, and crustaceans, however their relative importance differed upstream and downstream of the dam. Collectively, these results indicate that the dam did not negatively affect food quality for lungfish downstream. The most likely mechanism for potential FA deficiency and subsequent impacts on recruitment success in N. forsteri would be due to changes to the availability of high-quality food sources. This study highlights the need for future research to determine whether the low FA contents we observed in lungfish, is a function of broader environmental changes, or if FA contents are naturally low for this sub-tropical species.
机译：澳大利亚的肺鱼，Neoceratodus forsteri Krefft，1870年，是一种受威胁物种，由于土地利用集约化，水资源开发和其他人为压力，其长期存续受到威胁。河流水文学的变化有可能改变该物种某些高质量粮食资源的供应，这可能会影响征聘的成功，并导致人口减少。这项研究分析了布里斯班河大坝上游和下游两个位置的肺鱼卵和鳍组织的脂肪酸（FA）组成。我们检验了以下假设：与大坝相关的河流蓄水和水流变化已经改变了福斯特猪笼草重要饮食的饮食组成和FA组成，从而转化为人体组织和卵。使用碳和氮稳定同位素的混合模型估算了每种食物来源的贡献。与上游相比，下游部位的肺鱼鳍和卵中的总FA含量明显更高。在大坝上游和下游站点之间发现的九种潜在肺鱼食物来源的FA含量几乎没有显着差异。对肺鱼鳍组织的稳定同位素分析表明，最可能的食物来源是腹足动物，双壳类和甲壳类动物，但是它们相对的重要性在大坝的上游和下游有所不同。总体而言，这些结果表明，该大坝并未对下游下游肺鱼的食品质量产生负面影响。潜在的FA缺乏及其对福斯特猪笼草招募成功的后续影响的最可能机制可能是由于优质食物来源的供应量发生了变化。这项研究强调了未来的研究的必要性，以确定我们在肺鱼中观察到的低FA含量是否是更广泛的环境变化的函数，或者对于该亚热带物种而言FA含量是否自然较低。

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