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Determining the position of southern flounder Paralichthys lethostigma on the reproductive energy allocation spectrum using an essential fatty acid as a maternal dietary biomarker
Environmental Biology of Fishes ( IF 1.4 ) Pub Date : 2020-07-29 , DOI: 10.1007/s10641-020-01013-3
Corinne M. Burns , Lee A. Fuiman

Energy allocation strategies of fishes during vitellogenesis fall along a spectrum from rapid transfer of ingested nutrients into yolk (income breeding) to drawing upon reserves stored in somatic tissues (capital breeding). Southern flounder, Paralichthys lethostigma, migrate from estuaries to offshore habitats to spawn, likely resulting in variability in nutrient intake. The effect of variable nutrient intake on egg composition depends upon the position of southern flounder on the income—capital breeding continuum. The essential fatty acid docosahexaenoic acid [DHA, 22:6(n-3)] was used as a biomarker to determine energy allocation strategy by measuring whether a shift in maternal diet at the start of the spawning season results in changes in the proportion of DHA in eggs. Treatment groups of flounder were fed a common diet and then switched to a high DHA diet, low DHA diet, or no change (control) diet after the first spawn, and spawned weekly for 8 weeks. DHA content of eggs changed within a few weeks of the diet change to reflect the dietary DHA content, consistent with an income breeding strategy. However, after about five weeks, females receiving the low DHA diet mobilized DHA stored in liver and white muscle tissues to reverse a decreasing trend in DHA content of eggs, evidence of a capital breeding strategy. These results suggest that southern flounder are income breeders under nutritionally favorable conditions but have the flexibility to use somatic stores to build yolk when nutrient availability is limited.

中文翻译:

使用必需脂肪酸作为母体膳食生物标志物确定南方比目鱼 Paralichthys lethostigma 在生殖能量分配谱上的位置

卵黄生成期间鱼类的能量分配策略属于从将摄入的营养物质快速转移到蛋黄中(收入繁殖)到利用储存在体细胞组织中的储备(资本繁殖)的范围。南方比目鱼,Paralichthys lethostigma,从河口迁移到近海栖息地产卵,可能导致营养摄入量的变化。不同营养摄入对鸡蛋成分的影响取决于南方比目鱼在收入——资本繁殖连续体上的位置。必需脂肪酸二十二碳六烯酸 [DHA, 22:6(n-3)] 被用作生物标志物,通过测量产卵季节开始时母体饮食的变化是否导致能量分配策略的变化来确定能量分配策略鸡蛋中的DHA。比目鱼的治疗组被喂食普通饮食,然后在第一次产卵后改用高 DHA 饮食、低 DHA 饮食或无变化(对照)饮食,每周产卵 8 周。鸡蛋的 DHA 含量在饮食改变后的几周内发生变化,以反映饮食 DHA 含量,与收入育种策略一致。然而,大约五周后,接受低 DHA 饮食的雌性会调动储存在肝脏和白肌组织中的 DHA,以扭转鸡蛋中 DHA 含量的下降趋势,这是资本育种策略的证据。这些结果表明,南方比目鱼在营养有利的条件下是收入繁殖者,但在营养供应有限时可以灵活地使用体细胞储存来构建蛋黄。并且每周产卵 8 周。鸡蛋的 DHA 含量在饮食改变后的几周内发生变化,以反映饮食 DHA 含量,与收入育种策略一致。然而,大约五周后,接受低 DHA 饮食的雌性会调动储存在肝脏和白肌组织中的 DHA,以扭转鸡蛋中 DHA 含量的下降趋势,这是资本育种策略的证据。这些结果表明,南方比目鱼在营养有利的条件下是收入繁殖者,但在营养供应有限时可以灵活地使用体细胞储存来构建蛋黄。并且每周产卵 8 周。鸡蛋的 DHA 含量在饮食改变后的几周内发生变化,以反映饮食 DHA 含量,与收入育种策略一致。然而,大约五周后,接受低 DHA 饮食的雌性会调动储存在肝脏和白肌组织中的 DHA,以扭转鸡蛋中 DHA 含量的下降趋势,这是资本育种策略的证据。这些结果表明,南方比目鱼在营养有利的条件下是收入繁殖者,但在营养供应有限时可以灵活地使用体细胞储存来构建蛋黄。接受低 DHA 饮食的雌性会调动储存在肝脏和白肌组织中的 DHA,以扭转鸡蛋中 DHA 含量下降的趋势,这是资本育种策略的证据。这些结果表明,南方比目鱼在营养有利的条件下是收入繁殖者,但在营养供应有限时可以灵活地使用体细胞储存来构建蛋黄。接受低 DHA 饮食的雌性会调动储存在肝脏和白肌组织中的 DHA,以扭转鸡蛋中 DHA 含量下降的趋势,这是资本育种策略的证据。这些结果表明,南方比目鱼在营养有利的条件下是收入繁殖者,但在营养供应有限时可以灵活地使用体细胞储存来构建蛋黄。
更新日期:2020-07-29
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