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Spadefoot Pelobates vespertinus (Amphibia, Pelobatidae) as a transmitter of fatty acids from water to land in a forest-steppe floodplain
Science of the Total Environment ( IF 8.2 ) Pub Date : 2023-03-15 , DOI: 10.1016/j.scitotenv.2023.162819
Ivan W Bashinskiy 1 , Yury Yu Dgebuadze 2 , Nadezhda N Sushchik 3 , Vitaly V Osipov 4 , Michail I Gladyshev 3
Affiliation  

The transfer of biomass and polyunsaturated fatty acids by the spadefoot P. vespertinus (previously subspecies of P. fuscus) from aquatic to terrestrial ecosystems was studied for five years in small floodplain water bodies of a forest-steppe zone. Average emergence of metamorphs from unit of water area, wet mass was 6.7 g m−2 year−1. A ratio of the emergence to biomass was calculated and represented as E/B coefficient (an analog of P/B production/biomass coefficient). The average E/B was found to be 0.038 year−1. The introduced coefficient can be used for a coarse estimation of the emergence on the basis of tadpole biomass measurements. A considerable partitioning of tadpoles and metamorphs in the composition of fatty acids in their biomass was revealed. Tadpoles had significantly higher mean levels (percent of total fatty acids) of 16:0, 16:1n-9, 18:0, 20:5n-3 and 22:5n-3, while metamorphs had significantly higher levels of 14:0, 15:0, 17:0, 17:1n-8, 18:2n-6, 20:2n-6, 20:4n-6 and 22:5n-6, likely due to the shifting to terrestrial food. Metamorphs had significantly higher content of total fatty acids, mg g−1 of wet weight, and, in spite of lower level, they had significantly higher content of eicosapentaenoic acid (20:5n-3, EPA) than tadpoles. Metamorphs also had significantly higher content of docosahexaenoic acid (22:6n-3, DHA) and sum of EPA + DHA than tadpoles. Average flux of EPA + DHA from unit of water area with metamorphs was 3.27 mg m−2 year−1. The metamorphs appeared to be qualitatively and quantitatively prominent prey for a number of terrestrial consumers.



中文翻译:

Spadefoot Pelobates vespertinus(两栖动物,Pelobatidae)作为脂肪酸从水到森林草原漫滩土地的传递者

在森林草原带的小型洪泛区水体中,研究人员对铲足P. vespertinus (以前是P. fuscus的亚种)从水生到陆地生态系统的生物量和多不饱和脂肪酸的转移进行了五年研究。单位水域平均出现变质生物,湿重为6.7 g m -2  year -1。计算出苗率与生物量的比率并表示为E / B系数( P / B产量/生物量系数的模拟)。发现平均E / B为 0.038 年−1. 引入的系数可用于根据蝌蚪生物量测量粗略估计出现。揭示了蝌蚪和变质动物在其生物量中脂肪酸组成的相当大的分配。蝌蚪的平均水平(占总脂肪酸的百分比)显着更高,分别为 16:0、16:1n-9、18:0、20:5n-3 和 22:5n-3,而变质动物的水平显着更高,为 14:0 , 15:0, 17:0, 17:1n-8, 18:2n-6, 20:2n-6, 20:4n-6 和 22:5n-6,可能是由于转向陆地食物。变质物的总脂肪酸含量明显较高,mg g −1湿重,尽管含量较低,但它们的二十碳五烯酸 (20:5n-3, EPA) 含量明显高于蝌蚪。变态动物的二十二碳六烯酸 (22:6n-3, DHA) 含量和 EPA + DHA 总和也明显高于蝌蚪。单位变质水域的EPA+DHA平均通量为3.27 mg m -2  year -1。对于许多陆地消费者而言,变质动物在质量和数量上似乎都是突出的猎物。

更新日期:2023-03-20
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