Bivalves' physiological functions (i.e. growth, reproduction) are influenced by environmental variability that can be concomitant with trophic resource variations in terms of quality and quantity. Among the essential molecules that bivalves need to acquire from their diet to maintain physiological functions, fatty acids (FAs) such as polyunsaturated fatty acids (e.g. 20:4n-6 (arachidonic acid), 20:5n-3 (eicosapentaenoic acid) and 22:6n-3 (docosahexaenoic acid)) have been described to play a critical role. The present study examined the FA composition of gill membrane lipids of two bivalve species, Nodipecten subnodosus and Spondylus crassisquama, sampled in a coastal lagoon of the Northeastern Pacific (Ojo de Liebre, Mexico), at two contrasting locations (inner versus outer part of the lagoon) and at two different periods (February and August 2016). Spatiotemporal variations showed that FA composition of gill membrane lipids was highly correlated to FA composition of reserve lipids from digestive gland. This highlights the marked impact of the diet on FA composition of gill membranes. Interestingly, both species presented differences in the seasonal accumulations of plasmalogens and of particular FA that are not found in their diet (e.g. non-methylene interrupted FA, 22:4n-9trans, 20:1n-11), suggesting specific regulations of FA incorporation and lipid class composition in gill membranes to maintain optimal membrane function in their specific and changing environment. This study highlights the importance to characterize the spatial and temporal variability of food resources in order to apprehend the physiological consequences of environmental variability, as well as species differential regulation capacities in a changing world.

中文翻译：

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environmental膜脂肪酸对环境变化的响应的特定规定揭示了两个悬浮饲料喂养的双壳类动物（Nodipecten subnodosus和Spondylus crassisquama）之间的适应性差异。

双壳类动物的生理功能（即生长，繁殖）受环境变化的影响，环境变化的质量和数量可能与营养资源的变化有关。双壳类动物必须从饮食中获取以维持其生理功能的必需分子中，脂肪酸（FA）如多不饱和脂肪酸（例如20：4n-6（花生四烯酸），20：5n-3（二十碳五烯酸）和22已经描述了：6n-3（二十二碳六烯酸）起关键作用。本研究调查了两个双壳类物种Nodipecten subnodosus和Spondylus crassisquama的g膜脂质的FA组成，该物种在东北太平洋的沿海泻湖中采样（墨西哥Ojo de Liebre），在两个相对的位置（泻湖的内部与外部）和两个不同的时期（2016年2月和2016年8月）。时空变化表明，membrane膜脂质的FA组成与消化腺储备脂质的FA组成高度相关。这突出了饮食对g膜FA组成的显着影响。有趣的是，这两种物种的缩醛缩醛和特定脂肪酸的季节性积累都存在差异，这在其饮食中没有发现（例如，非亚甲基间断脂肪酸，22：4n-9trans，20：1n-11），这提示了脂肪酸掺入的具体规定g膜中的脂质和脂质类成分，以在特定和不断变化的环境中保持最佳的膜功能。